Royal Decree 949/2001, of 3 August, which regulates the access of third parties to gas installations and establishes an integrated economic system of the natural gas sector, develops the basic lines that must contain the Technical Management Standards of the Natural Gas System. Article 13 (1) states that the Technical Manager of the System, in collaboration with the other subjects involved, shall draw up a proposal for a system of technical management of the system, which shall raise the Minister of Economy for approval or modification.

In compliance with the above, the Minister of Industry, Tourism and Trade issued Order ITC/3126/2005 of 5 October, approving the Technical Management Standards of the Gas System, which in its final disposition empowers the Directorate-General for Energy Policy and Mines to take the necessary measures for the implementation and enforcement of the order, in particular to approve and amend the detailed protocols of the Technical Management Standards and other requirements, rules, documents and operating procedures set to allow for the correct operation of the system.

This order, in the Technical Management Standard NGTS-12, paragraph 12.2, established the creation of a working group for the updating, revision and modification of the rules responsible for the presentation for approval by the Directorate-General for Energy Policy and Mines, for proposals for updating, reviewing and amending the rules and protocols for the management of the gas system.

On the basis of the above, a proposal to amend the Protocol of Detail PD-01 "Measurement" to be titled Detail Protocol has been received by the Technical Manager of the System with the date of October 25, 2010. PD-01 "Gas Measurement, Quality and Odorization".

According to the third paragraph of the third paragraph of Law 34/1998 of 7 October, of the Hydrocarbons Sector, in its wording given by Law 12/2007 of 2 July, which amends the Law on Hydrocarbons with the End In order to adapt it to the provisions of Directive 2003 /255/EC of the European Parliament and of the Council of 26 June 2003 and Article 13 of Royal Decree 949/2001 of 3 August 2003, the National Energy Commission has issued the report 20/2011, adopted by its Board of Directors in session on 14 June 2011, and for which it has been drawn up The Commission shall take into account the arguments put forward in the hearing procedure carried out through the Hydrocarbons Advisory Board.

In addition, this resolution has been the subject of a report by the Spanish Metrology Center, in those aspects related to facilities and equipment of measurement.

In its virtue, this General Address resolves:

First. Modification of the PD-01 Detail Protocol "Measurement".

The content and title of the Protocol of Detail PD-01 "Measurement", adopted by Resolution of 13 March 2006, of the Directorate-General for Energy Policy and Mines, establishing the detailed protocols, is replaced. of the Technical Management Standards of the Gas System, by the text included in the Annex to this resolution.

Second. Entry into force.

This resolution shall enter into force 30 days after its publication in the "Official Gazette of the State", with the exception of paragraphs 6.4 and 6.5, which shall apply within 6 months of publication, with regard to the metrological equipment and installations of measurement and analysis to be applied from the publication of the legislation of development, and of all the sections referring to the gas from unconventional sources that will enter into force the following day of their publication.

Madrid, September 22, 2011. -Director General of Energy Policy and Mines, Antonio Hernández García.

ANNEX

PD-01 detail protocol "gas measurement, quality, and odorization"

1. Object.

This detail protocol aims to develop the Technical Management Standard of the Gassist System NGTS-05 "Measurement". To this end, concepts and procedures are defined relating to the measurement, quality and odorization of natural gas, manufactured gases, and gases from non-conventional sources, such as biogas, gas obtained from from biomass or other types of gas, provided that it is technically possible and safe to inject such gases into the natural gas transmission and distribution networks.

2. Glossary.

The definitions contained in the Technical Management Standard of the Gassist System NGTS-01 "General concepts" and, as regards metrological control, the definitions contained in Article 2 are used in this detail protocol. Annexes III, IV and VI to Royal Decree 889/2006 of 21 July 2006 regulating the metrological control of the State on measuring instruments.

3. General conditions.

All obligations and responsibilities associated with the correct operation and metrological control of equipment and facilities for measurement, analysis and odorization, as well as those related to its maintenance, repair and/or substitution in their case, together with the security required for the equipment and facilities involved, will correspond and will be assumed by the holders of the same, as established in the current legal regulations.

3.1 Right of access to measurement facilities and their verification.

At transport-transport points (including outbound connections from LNG regasification plants and underground storage), transport-distribution, distribution and distribution points supply to consumers, the holder of the installation shall allow access to the measuring equipment to the other party involved, after prior consultation of the visit.

For these purposes, the operators of the interconnected facilities, the Technical System Manager (GTS) and the commercial operators of the vehicle gas are considered to be involved in the connection points.

For your part, the consumer, the dealer/carrier of the network to which you are connected, and the marketer you supply are considered to be involved in the supply points. The GTS shall be considered to be involved in a supply point where, in accordance with the definition contained in the NGTS-01, it is a consumer that can condition the normal operation of the network to which it is connected with its behaviour.

When the holder of the measurement equipment is the subject that receives the gas, the subject that delivers it will have the right to carry out periodic checks, such as: taking of readings, verification visits measurement elements and the state of the sealing elements of the measurement systems.

In addition to the metrological control obligations that may be derived from Law 3/1985, March 18, Metrology, Royal Decree 889/2006, and its development regulations, the subjects of the Gas System (carriers, distributors, marketers and consumers) will be able to request extraordinary checks on measurement systems. Such extraordinary checks shall have an identical scope to the periodic verification provided for in the metrological control of the equipment.

The costs incurred by the extraordinary verification of the measuring equipment shall be borne by the applicant unless the metrological control of the measuring equipment confirms the existence of a deviation higher than the permissible deviation, in which Case shall be borne by the holder of the equipment.

3.2 Right of access to the information for the telemedida.

The GTS will have continuous access to the telemetry of all the starting points of the Basic Network. This access will not cost users any cost. The GTS will receive the telemetry signals from consumers that can condition the normal operation of the network to which they are connected daily, either directly or through the distributor.

In addition, distributors will receive in their telemetry manager center, the measurement data of the supply points of those consumers who have it. This data will be made available to the participating agents (marketers, carriers and GTS) through the Transport-Distribution Communication System (SCTD), in a daily detail, before ten hours of the day following the day of consumption.

3.3 Right to install telemedida on measuring equipment at connection points On transport-transport points (including the connections of exit from LNG regasification plants and storage) (a) subways), transport-distribution, distribution and supply points to consumers, which may have an impact on the operation of the network, or where it may be necessary for the completion of the balance sheets, the holder of the installation must allow the other party to install the telemetry on the equipment measure. The cost of the installation will be assumed by the party that installs the equipment.

3.4 Regulatory provisions and applicable standards for gas measurement, quality and odorization.

The GTS will publish and keep updated on its website the list of regulations and standards (UNE-EN and others) in force, applicable to the measurement, quality and odorization of gas and its equipment, enabling the download of those documents that are free and free of charge. It will also be able to understand the relevant information contained in it in an understandable way for the consumer.

In relation to the regulations, the listing, at least, will refer to:

-The extract from the provisions of the sectoral regulations regarding reading and measurement, as well as the process of regularisation of measures.

-Spanish legal metrological regulations and UNE-EN standards applicable to different equipment: counters, converters, chromatographers, etc.

-Current Spanish regulations and UNE-EN standards that allow to determine the size of the counter for the supply points applicable in accordance with paragraph 4.4.4 of this detail protocol.

-UNE or internationally accepted standards that allow the determination of the quality characteristics of the gas in order to check whether it complies with the specifications set out in heading 5 of this detail protocol.

-The UNE or internationally accepted standards that establish the measurement and calculation procedures that they apply in accordance with heading 6 of this detail protocol.

-The altitude in meters of the municipalities used for the calculation of the pressure conversion factor (Kp), as well as the official competent statistical body that publishes it.

In order to disseminate and facilitate information prior to final consumers, both distributors and marketers must publish on their website either a reproduction of the content of the GTS page, or well a link to this page.

3.5 Operation Manuals and Measurement Protocols.

The operating manuals and/or measurement protocols that the holders of the facilities of the gas system establish with other holders of adjacent facilities or with consumers, shall be consistent with the above in this Protocol, without prejudice to the possibility of agreeing on other non-regulated aspects between the parties.

The carriers will publish on their website the models of operation manuals and measurement protocols that they use.

4. Gas measurement and analysis equipment.

At transport-transport points (including outbound connections from LNG regasification plants and underground storage), transport-distribution, distribution-distribution and at supply points to consumers, the facilities and equipment of measurement must be subjected to the obligations of metrological control that can be derived from Law 3/1985, of Royal Decree 889/2006, and of its regulations of development.

In any case, it will be necessary to have the certificate of prior conformity of the installation and equipment of measurement, as established in the Spanish legal metrological regulations. Furthermore, the parties involved, in accordance with the definition contained in paragraph 3.1, will have the right to state that the installation and equipment of the measure have the appropriate certification of metrological conformity, after the prior consultation of a visit with the holder of the visit.

4.1 Entitlement.

At the points of transport-transport, transport-distribution, distribution and supply points to final consumers, ownership of these equipment will be determined by the legislation in force or, failing that, by the agreements reached by the parties.

4.2 Points of the Gas System that must possess gas quality analysis equipment.

The measurement installations of the following connection points must have composition, PCS, and density analyzers:

1. Connection points with pipelines or international deposits.

2. Connection points with national deposits.

3. Point of unloading of ships in the LNG regasification plants.

4. Connection points with LNG regasification plants.

5. LNG tanker loading points.

6. Connection points with underground storage.

7. Points of connection with production plants of manufactured gases and gases from non-conventional sources, such as biogas, gas obtained from biomass or other types of gas.

8. Points where the composition of the gas may be altered, or which are accurate for its representativeness for the proper calculation of the composition. These points will be referred to as singular points of measurement of the quality of the gas of the Basic Network.

9. Consumer connection points that may condition the normal operation of the network to which they are connected, according to definition included in the NGTS-01.

4.3 Points of the gas system whose measurement and analysis equipment must be equipped with telemetry.

The measurement facilities of the following connection points must have digital telemedida:

1. Connection points with pipelines or international deposits.

2. Connection points with national deposits.

3. Connection points with LNG regasification plants.

4. Connection points with underground storage.

5. Points of connection with production plants of manufactured gases and gases from non-conventional sources, such as biogas, gas obtained from biomass or other types of gas.

6. Consumer connection points which may condition the normal operation of the network to which they are connected, in accordance with the definition contained in the NGTS-01, or of any other consumer who is obliged to dispose of an agreement with the legislation in force.

4.4 Technical characteristics and specifications of measuring equipment.

As a general rule, measuring equipment must be subject to the following criteria:

-On the measurement lines of the transport-transport connections (including outbound connections from LNG regasification plants and underground storage), transport-distribution and distribution-distribution, the counter must be working above the transition flow rate (Qt) of the same 80% of the time and in no case below the minimum flow rate (Qmin).

-In the cases indicated in the preceding paragraph where the counter is detected working outside the range for which it was intended, the following measures shall be taken, in order of priority:

1. Adoption of interim agreements between those responsible for the operation of the downstream network and above the counter.

2. Replacement of the counter by an appropriate range, or in any case, by the lowest possible range without the need for mechanical work.

3. Making modifications to the measurement line in those cases where option 2 is not technically possible. To do this, the operator must implement an adjustment plan which must be approved by the GTS, who will have to it shall set the time limits for the submission of the proposal and the time-limits for the proposal.

These actions should be performed as soon as possible, once the dysfunction has been detected.

4.4.1 LNG tanker loading points.

At each LNG tank loading point, the holder of the regasification plant shall have a scale of the following characteristics:

-Range: 60 Tons.

-Reading scale: 20 kg.

-Precision: not less than 0.2% of the read value.

The scale and other equipment used for the measurement, such as chromatographers, will be subject to the legal metrological control that is applicable, both in its commissioning and in the verifications periodic and after repair or modification, in order to ensure their accuracy within the established ranges.

4.4.2 Points of entry to the transport networks and exit points of the Basic Transport Network.

At the points of entry to the transport networks and at the exit points of the Basic Transport Network, each line of the measurement installation shall consist of the following elements:

1. A gas meter that has exceeded the metrological conformity assessment established in the European Union and complies with the UNE-EN standards that are applicable to it, and the appropriate dynamics to cover the range of flow rates that are circulating in the Union. The counter shall be equipped with a pulse emitter for communication with the flow converter.

2. A PTZ-type flow converter that has exceeded the metrological conformity assessment established in the European Union and complies with the UNE-EN standards that apply to it, with absolute pressure transmitter and associated temperature, being the class set 0.5 according to the corresponding UNE standard.

3. An auxiliary line of measure identical to the main one.

4. A remote unit shall be provided by the measuring facility, in accordance with the specifications defined by the operator delivering the gas, which enables it to have the measurement and quality data of the gas (if any) in its (a) management centres for telematic systems, and in accordance with existing legislation.

4.4.3 Connection points between distribution networks.

The measurement systems at the connection points between distributors, regardless of their count pressure, must operate in the range of flow rates that the manufacturer has established for the same, having double measurement line in the assumption that summer and winter consumption so advises.

In the case that the installation does not have a double count line, it must have a bypass that allows the change of counter. Also, in cases where the flow between the two networks is foreseen, or exists, reversibility, the measurement system shall be prepared to measure in both directions.

The composition of each of the lines composing the measurement installation will depend on its capacity, expressed in nominal flow rate, and the count pressure.

In measuring systems with counting pressures greater than 4 bar, the installations shall consist of the same elements as set out in paragraph 4.4.2.

In measuring systems with counting pressures less than or equal to 4 bar, the facilities shall consist of:

1. A gas meter which has exceeded the metrological conformity assessment established in the European Union and complies with the UNE-EN standards applicable to it, and which is suitable for the appropriate dynamic to cover the range of flows in the European Union same.

2. A PT or PTZ type flow converter that has exceeded the metrological conformity assessment established in the European Union and complies with the UNE-EN standards applicable to it. The chosen option will be agreed between the parties on a case-by-case basis and will be reflected in a protocol signed by both parties, where the respective rights and obligations will be defined.

Those measuring systems which were operating prior to the entry into force of this Protocol, and whose schemes do not comply with this paragraph, may continue to be used until the end of their useful life, or until its amendment, without prejudice to the provisions of the preceding paragraphs.

In the cases referred to in point 3.2, the measurement systems must have a telematic team that allows access to the data in the manager's telemetry centre.

4.4.4 Provisioning points.

In the particular case of measurement systems at the supply points, the typology of the measurement systems in terms of configuration and constituent elements shall be determined according to the maximum hourly rate measured at the reference conditions of the gas system (considering as such pressure equal to 1,01325 bar and temperature equal to 273,15 K) and the annual consumption, as indicated in the following tables, and in the schemes of measurement systems defined in the paragraph 4.4.5.

Table 1: Measurement systems according to the maximum flow rate and final consumption for measurement pressures > 0.4 bar

Flow [m3/h]	Annual Consumption (GWh)
	< 10	≥ 10 and < 100	≥ 100 and < 150	≥ 150
Q < 150	Fig III with PT converter	-	-	-
150 ≤ Q < 350	Fig III with converter PT	Fig III with PT converter	-	-
350 ≤ Q < 600	Fig III with PT converter	Fig III with PT converter		Fig III with PT	Fig III with PT converter
600 ≤ Q < 3500	Fig III with PT converter	Fig III with PT converter	Fig III with PTZ converter	Fig IV with PTZ
3500 ≤ Q < 6500	Fig III with PT converter	Fig III with PTZ converter	Fig IV with PTZ converter	Fig IV with PTZ
Q ≥ 6500		Fig IV with PTZ converter	Fig IV with converter PTZ	Fig IV with PTZ

Table 2: Measurement systems according to the maximum flow rate and the final consumption for measurement pressures ≤ 0,4 bar

-

Centro_table_body"> 350 ≤ Q < 600

Flow [m3/h]	Annual Consumption (GWh)
	< 2	≥ 2 and < 5	≥ 5 and < 10	≥ 10 and < 100	≥ 100
Q < 150	Fig I	Fig I	Fig I	-	-
150 ≤ Q < 350	Fig I	Fig II	Fig II		-
-
-
Fig I	Fig III with PT converter	Fig III with translator PT	Fig III with PT converter	-
Q ≥ 600		Fig III with PT converter	Fig III with PT converter		Fig III with PT	Fig III with PT

Note 1: In measurement facilities with schemes I and II, the correction shall be made by the fixed conversion factor resulting from the application of the provisions of heading 6.2.

Note 2: The facilities to be provided with the scheme I but that for operational needs cannot be changed the counter in working time (from 8 to 18 hours), must be made available to the scheme II.

The measurement systems shall be designed on the basis of the expected peak flow rate, as well as their modulation, i.e. ensuring that the chosen counter covers at all times the range of flow rates in the range. including the minimum hourly rate, according to what is regulated.

In consumers whose variations in consumption make it impossible for a measuring system with a single counter to cover with its extension of measurement the aforementioned variations, the gas measurement must be carried out on the basis of a system of Parallel switching covering these flow variations or the consumption of consumption shall be independent.

In cases where the consumer contracts a supply higher than the one he had, which would entail a change in the typology of the existing content installation, the operator must implement a plan of adequacy to be previously approved by the relevant network operator, assisting the right analogue marketer.

In cases where it is detected that the consumer has lowered his/her consumption in such a way as to result in a change of equipment in the existing container, the operator must implement an adjustment plan that will be previously approved by the relevant network operator, assisting the right analogue marketer.

The operators of the networks must communicate to the consumers connected to their networks and that they are obliged to have telemetry in their measurement facilities, their communication protocols so that they allow to receive such information in your telemedide manager center.

Those measuring systems that were operating prior to the entry into force of this Protocol, and whose schemes do not comply with this paragraph, may continue to be used until the end of the useful life of the same, without prejudice to the provisions of the preceding paragraphs.

4.4.5 Schemes for measuring systems according to the maximum flow rate and annual consumption.

Here are several images in the original. See the official and authentic PDF document.

4.5 Characteristics and technical specifications of the analysis teams.

Quality assessment teams must have the metrological conformity assessment granted by the competent authority of the European Union, be digital, with hourly and daily records, with a capacity of minimum storage of 31 days and must be able to provide at least the following information by continuous analysis of the gas flow:

-molar percentages of each of the following components: Nitrogen, Carbon Dioxide, Methane, Ethane, Propane, Isobutane, n-butane, n-pentane, Isopentane, C6 + fraction.

-Lower heat power (PCI) and higher heat power (PCS) in kWh/m3 (under reference conditions).

-Relative Density (d).

-Wobbe Index (W) in kWh/m3 (under reference conditions).

These calculations will be performed according to the corresponding UNE standard. The calculation of the gas PCS on a volumetric basis shall be expressed as Hs [t1,p1, V (t2,p2)] under the reference conditions [0 ° C, V (0 ° C, 1.01325 bar)].

In international gas pipeline connections with Europe, the details of the application of the detailed protocol for the calculation of the gas PCS will be used.

In connection with production plants of manufactured gases and gases from non-conventional sources, such as biogas, gas obtained from biomass or other types of gas, equipment must be installed. analysis and control to enable the continuous monitoring of the gas introduced into the system. Such equipment must be accepted by the interconnected parties and must have the corresponding certifications.

A plan to replace or adapt its equipment to be validated by the GTS shall be designed by operators who have equipment that does not meet the indicated characteristics.

5. Analysis of the quality of the gas.

5.1 Agent responsibility.

5.1.1 Regular measurement and control points for measuring equipment and systems.

It will be up to the GTS to define the unique points of measurement of the quality of the gas of the Basic Network where the installation of a team of analysis of the parameters of the quality of the gas is necessary.

The operator of the installation where a gas quality analysis team is located shall regularly monitor the measurement system in order to verify its proper functioning and send the GTS, as soon as possible, to the GTS. a detailed description of the incidences of the detected gas quality analysis equipment, together with the results obtained in the case of the application of corrective measures.

The GTS will monitor the performance of these controls, and will issue an annual report indicating, for each holder and for each installation, a comprehensive summary of the incidents detected in the year, grouping them by homogeneous types, a details of each detected incidence, an assessment of the impact on the measurement, as well as the corrective measures applied or to be applied. Team holders will receive the part of the report referred to them, and the entire report may be requested by the National Energy Commission and the General Directorate of Energy Policy and Mines.

Each and every operator of the gas quality control facility shall be obliged to store the results of the checks and analyses carried out.

Every six months the GTS must issue a network relationship where the quality of the gas and the new composition to be introduced into the PTZ converters must be changed.

5.1.2 Gas quality.

Gas system users who introduce gas will be responsible for their quality and compliance with the specifications set out in this detail protocol.

Users who inject manufactured gases or gases from unconventional sources into the gas system, such as biogas, gas obtained from biomass or other types of gas, shall, by way of certification issued by the competent bodies concerned, which the gas provided complies with the specifications set out in paragraph 5.2, for entry into the transport network.

Additionally, the introduction of gases produced by microbial digestion processes will be conditioned by the user's assessment of the risk that micro-organisms and other possible minority components of These gases may represent for the health of the persons or for the integrity of the installations or equipment for consumption.

The gas entry point holder in the Gas System shall monitor the quality of the gas introduced in order to inform the GTS and all affected subjects as soon as possible of any deficiency of gas. the quality of the gas, estimating the possible duration of the non-compliance. In any event, the GTS may take the measures it deems necessary to cancel or minimize the impact that this eventuality may have on the Gas System.

However, when the carrier is notified or is satisfied that it is receiving or receiving a gas at the point of entry outside the established quality specifications, it may:

1. Completely or partially reject off-spec gas.

2. To accept, exceptionally in the case of regasification plants, fully or partially the gas, respecting the criteria of reliability and safety of the Gas System, that is, the gas that is introduced into the transport and distribution system if must meet the quality specifications. In this case, the owner of the gas shall pay the carrier the duly justified costs incurred by the carrier for the acceptance of the natural gas outside the specifications.

The holder of the installation with a gas entry point in the Gas System has no obligation to deliver the natural gas at the exit points with exactly the same characteristics as the gas that was introduced by points of entry, provided that the agreed quantity is delivered in terms of energy.

Gas delivered to the consumer, regardless of their origin, shall not contain dust particles or other impurities in such quantities that may impair the health of the consumer or damage the consumer's facilities.

5.2 Gas quality specifications.

All gas entered at the entry points of the Gas System must comply with the quality specifications of the following table:

Table 3: Gas quality specifications introduced into the Gas System

Property (*)

PCS

Unit	Minimum	Maximo
Wobbe Index	kWh/m3	13,403	16,058
kWh/m3	10.26	13.26
D	m3/m3	0.555	0,700
S Total	-		-	-	50
H2S + COS (as S)	mg/m3	-	15
RSH (as S)	mg/m3	-
	O2		-
CO2		2.5
	H2O (dew point)		-	+
HC (Dew Point)	° C to 1-70 bar (a)	-	+ 5
/Particles	-

(*) Table expressed in the following reference conditions: [0ºC, V (0ºC, 1.01325 bar)]

In addition to the above characteristics, gases from non-conventional sources such as biogas, gas obtained from biomass or other type of gas produced by microbial digestion processes shall be comply with the quality specifications of the following table:

Table 4: Gas quality specifications from non-conventional sources introduced into the Gas System

Property (*)

Unit	Minimum	Maximo
	Metano (CH4)	mol%	95			CO
mol%	-	2
H2	mol%	-	5
Halogenated Composites: Fluor mg/m3		-	10 1
Ammonia	mg/m3	-	3
Mercury	µ g/m3	-	1
Siloxanes	-	10
	benzene, Toluene, Xileno (BTX)	-	mg/m3	-	500
Microorganisms	-	Technically pure
/Particles	-	Technically pure

(*) Table expressed in the following reference conditions: [0ºC, V (0ºC, 1.01325 bar)]

5.3 General criteria for the gas composition analysis procedure.

In addition to the requirements established for measuring instruments in the field of metrological control, derived from Law 3/1985 and its development regulations, the chromatograph will carry out a daily automatic calibration using standard gas cylinders produced by accredited suppliers for the analysis of natural gas in accordance with ISO 17025.

The chromatograph shall be calibrated with a composition gas similar to the gas analysed.

Data on the quality of the gas, which is necessary to perform the functions entrusted to the GTS, will be sent through the Logistic Network of Third-Party Access to the Network (SL-ATR).

5.4 Changing the quality of the gas in the PTZ converters.

Every six months the GTS must issue a network relationship where the quality of the gas and the new composition to be introduced into the PTZ converters must be changed.

They will form part of this relationship, those networks where the average PCS of the semester exceeds in ± 1% to the PCS of the gas that is introduced in the PTZ correctors of the measurement equipment of a network.

In those networks that are within the range of variation of ± 1% of the PCS, the GTS will analyze the variation of Z that assumes the average composition of the gas in the last semester with respect to the composition of the gas used in those moments in the PTZ correctors. If it is noted that it is significant in relation to the error ranges allowed in the measurement equipment, it will also include these networks in the relationship that you have to issue.

For the purposes of making parameter modifications to the measurement equipment, the metrological regulations in force will apply, and the parties involved can assist the change, if they manifest it.

In the case of stream converters connected to continuous chromatograph, these values will be introduced as default values, although in case of failure of the chromatograph signal the last valid data will be taken.

6. Gas measurement.

6.1 Measurement procedures at points in the Gas System.

As a general criterion, the measurement and calculation procedures will be adjusted to the corresponding UNE standard.

6.1.1 Measurement procedure in ship unloading.

The provisions of the PD-05 Detail Protocol "Energy Determination Procedure Downloaded by Methaners" will be applicable.

6.1.2 Measure procedure at the points of entry and exit of the transport network and in the transport-transport, transport-distribution and distribution-distribution points.

At the points of entry and exit of the transport network, connections with LNG regasification plants, international connections, connections with national fields, connections with storage subways and connections with manufacturing and gas production plants from non-conventional sources, the operator of the measurement installation shall perform the reading of the equipment.

At gas transfer points between two distributors, the reading of the measurement equipment will be performed by the operator of the installation.

In both cases, regardless of the right to attend the reading taking on the other party, in the event that you do not attend, the person responsible for taking the reading will make it available to you within a period not exceeding the two working days.

The readings will be taken at the end of the monthly reading period, according to the calendar approved by both parties. At the delivery points that are telemedidos, this "in situ" reading period may be extended, provided that the two parties reach a consensus.

The relevant operator shall draw up a daily part of the gas emission, which shall provide the upstream distributor or the carrier, depending on the network to which the installation is connected, so that it can carry out its functions. This information shall be provided through the SCTD or the SL-ATR, as the addressee.

6.1.3 Measure procedure in the loading of LNG tankers.

LNG carriers must comply with the regulations and regulations in force in Spain for this type of transport.

For the purposes of measurement and before the first load, the owner of the tank must make the following documentation available to the holder of the regasification plant:

-Tank feature plate.

-Certificate of capacity issued by a properly authorized entity.

The measurement of the LNG delivered in each tank will be carried out in kWh, based on:

-To the net weight (in kg) determined in scale, by difference between the heavy output and the input of the tanker.

-The quality of LNG (PCS expressed in kWh/kg and kWh/m3 under reference conditions) obtained from the continuous analysis by chromatography of representative samples of the LNG loaded in tanks.

The amount of LNG charged in each tank will be obtained from the above concepts, which will consist of the documentation that is delivered.

Likewise, the holder of the regasification plant shall report daily to the GTS, through the SL-ATR, of the LNG outlets for each distributor, marketer, or consumer that supplies gas to the system.

6.1.4 Measurement procedure at provisioning points.

For consumers who have telemedide equipment in their measurement facilities, the daily consumption data shall be transmitted to the network operator to which they are connected, by means of a telemetry using the communication protocol defined by that operator.

Consumers who are required to have a telemetry and who do not have it operational should make it easier for the distributor/carrier to whom they are connected, each day before 6 hours, the readings of the measuring equipment corresponding to the previous day's consumption. To do so, they will use the formats provided by the distributor/carrier and the shipments will be made, preferably, by email.

The network operator will perform a monthly data-taking reading of all consumers with annual volume greater than 100,000 kWh, which do not have telemedida, or is not operational.

In those consumers who are legally obliged to dispose of, and do not have, telemetry or have it not operational, this being the responsibility of the consumer, the daily distribution of consumption will be carried out by applying a procedure laid down for that purpose which, prior to its application, must be known to the consumer and the trader concerned.

The network operator will be responsible for transforming this data into energy units and incorporating it into the SL-ATR so that the corresponding Balances and Repairs can be performed.

For consumers with annual volume equal to or less than 100,000 kWh, data-taking readings will be performed at the periodicity indicated in the current legislation. In such cases, the daily distribution of consumption shall be based on the technical management rules of the NGTS-06 system "Repairs" and NGTS-07 "Balance".

In any case, the provisions of the current legislation will be in place.

6.2 Conversion of volume units to energy.

To perform the conversion of the unit of measurement of the meters, m3, to the unit of energy measure established, kWh, the energy value of the natural gas referred to the higher calorific value (PCS), measured in the Reference conditions of the gas system of 1.01325 bar (1 bar = 105 Pa) and 273,15 K. The calculation formula to be applied shall be as follows:

An image appears in the original. See the official and authentic PDF document.

Being:

E = Power delivered at the point of supply.

V = Volume measured in the provisioning conditions.

Fc ' = Volume conversion factor.

The conversion factor by the measurement conditions will be calculated as:

An image appears in the original. See the official and authentic PDF document.

Being:

PCS = Calorific gas power at the measurement point measured under the reference conditions (1.01325 bar and 273.15 K).

Fc = Volume conversion factor to move from the measurement conditions to the reference conditions.

The conversion of the m3 measured by the meter to m3 under the reference conditions will be done by using electronic conversion equipment (converters) that carry out the calculation on a continuous basis, integrating the pressure, temperature and compressibility signals measured on the corresponding transmitters, and using a conversion factor (Fc) given by the formula:

c =	Pc.provisioning	×	Tc.reference	×	Zc.reference	= Kp× Kt × Kz
	Pc. reference		Tc. supply		Zc.

Being Z the compressibility factor, defined as the ratio between the molar volume of a real gas and the molar volume of the same gas considered as ideal.

The calculation of the compressibility factor in both the reference conditions and the supply conditions shall be performed according to the SGERG-88 procedure included in the standard UNE-EN ISO 12213.

In paragraph 4.4 of this protocol, the requirements for the installation of pressure converters, temperature and compressibility factor (PTZ converters and PT converters) are set according to the pressure to which the measure and the maximum flow rate.

For consumers supplied at pressures of less than or equal to 0,4 bar the influence of factor Z shall be disregarded, i.e. it shall be assumed that its value is close to the unit, and consequently the conversion factor for which it is multiply the volume measured in m3 to express it under the pressure and temperature reference conditions shall be:

Fc =

Pc.provisioning	×	T c.reference	= Kp× Kt
P c.reference		Tc.provisioning

Being:

Kt = Temperature conversion factor.

Kp = Pressure conversion factor.

The temperature conversion factor will be calculated using the following formula:

t =	273.15
	273.15 + T gas

Where Tgas is the temperature of 10 ° C.

The pressure conversion factor will be calculated using the following formula:

p =	Pc + Patm
	1.01325

Where:

Pc = Relative Supply Pressure (bar).

Patm = Atmospheric Pressure (bar).

The value of atmospheric pressure is a function of the altitude (A) of the municipality where the supply point is located and will be calculated according to the following formula:

atm = 1.01325-k × A = 1.01325-	0.1223 × A
	1000

Where "A" is the altitude in meters of the municipality where the point of supply is located, published by the official competent statistical body.

For your part, the "k" factor will be calculated by applying the following formula:

k

[	mbar	]	=	g × d	= 0.1223
	m			100

Being "d" air density (ISO 6976) interpolated to Tgas (10ºC) and "g" standard acceleration of gravity, with values:

d = 1,2471

g = 9.8065 (m/s2)

6.3 PCS applicable to consumers connected to transport networks.

In the case of consumers connected to transport networks the daily values of PCS that correspond to the nearest point of measurement located upstream shall be applied.

6.4 PCS applicable to consumers connected to distribution networks.

For supply points, which do not have higher calorific value (PCS) measurement equipment, the average daily average calorific value (PCSDiario) for the network of the higher calorific value (PCS) shall be allocated to the distribution where they are located, calculated according to the following formula.

An image appears in the original. See the official and authentic PDF document.

Where:

i = Connection of the distribution network where the point of supply is located, with the transport network.

m = The number of connections in the distribution network where the provisioning point is located, with the transport network.

Vi = Vehicle gas volume on day "d" through the "i" connection of the distribution network where the point of supply is located.

PCSi = average PCS of the gas measured by the chromatograph associated with the "i" connection of the distribution network, either the one that is located on the PCTD or the nearest upstream.

6.4.1 Consumers without telemedida equipment.

In the case of consumers of monthly or higher reading, in order to determine the average calorific value (PCSMedio) to be used in the calculation of the kWh consumed in the billing period, the average of the values will be applied The PCSDiary of the distribution network where the consumer is located, weighted by the daily volume of vehicle gas through the same, during the 30 or 60 days immediately preceding the day "n-2" of the last reading, depending on whether reading is monthly or bimonthly, and according to the following formulas.

An image appears in the original. See the official and authentic PDF document.

Where:

PCSMedia = Average higher calorific power applicable to billing periods whose last reading is performed on day "n"

d = Billing period day.

n = Last read day.

Vd = Sum of the volume of vehicle gas the day "d" through all the connections of the distribution network where the consumer is located, with the transport network.

PCSDiary, d = PCSDaily of the vehicle gas to the distribution network where the provisioning point is located during the day "d".

6.4.2 Consumers with telemedide equipment.

In the case of supply points with telemedida, at least the daily higher calorific value (PCSDiario), calculated as described, will be applied to the daily consumption, and the time data (PCSSchedule) can be used in case to have that information available.

When using the PCS time data, these are assigned as follows:

-If the point of supply is located in a distribution network with a single point of connection to the transport network, the PCSSchedule that determines the analysis team associated with the connection will be assigned to it.

-If the supply point is located in a distribution network with multiple points of connection to the transport network, the value of the PCSTime will correspond to the average value of the PCSTime data that determines the analysis equipment associated with each of the different connections, weighted by the volume of gas used by each of them.

6.5 Information to publish about the conversion factor.

The GTS will publish in the SL-ATR the list of municipalities supplied by natural gas (including those supplied from LNG satellite plants), manufactured gas and gas from unconventional sources, with the volume conversion factors applicable to consumers who do not have pressure and temperature converters.

This listing will include, for each municipality, the considered altitude and the value of the conversion factor Fc corresponding to the supply pressures, including at least the five standardized relative pressures (0.02, 0.10, 0.15, 0.30 and 0.50 bar) and an average supply temperature of 10 ° C, to be considered as the weighted average national temperature. It will be the responsibility of the distribution company to communicate to the GTS of the municipalities in which the gas distribution activity is carried out, together with the identification of the connections of the distribution networks of these municipalities with the transport network.

In addition, in the SL-ATR, the number of connections with the transport network, as well as the chromatographers associated with each connection, will be identified for each municipal network, with the highest calorific value for each connection. daily average (PCSi) and the daily volume of vehicle gas through them (Vi), as well as the average daily average calorific value of the network where the supply points (PCSDiario) are located, calculated as set out in paragraph 6.4.

On a daily basis, the GTS shall publish in the SL-ATR the average higher calorific value of each distribution network (PCSMedio) corresponding to the previous day (day "n") and calculated as set out in paragraph 6.4.1.

The SL-ATR must maintain a history of at least 24 months with this information in order to allow verification by the competent bodies of the calculation of the PCSMedium used for the purposes of determining the kWh. consumed in the billing period.

The above information, understandable to the end user, including the Fc conversion factor applicable to supply pressures, including each of the five standardized relative pressures (0.02, 0.10, 0.15, 0.30 and 0.50 bar) of each distribution network, together with its higher average daily average calorific value (PCSDiario), will be published on the GTS website. This page will also include the possibility that consumers of monthly or higher reading, introducing the distribution network of the point of supply and the date of the last reading of the consumption to be invoiced, can obtain the applicable PCSMedio on the invoice.

7. Metrological control of the measurement facilities.

Gas measurement and analysis installations must comply with those aspects regulated by the Spanish legal metrological regulations of application and, in particular, by the provisions of Law 3/1985, of March 18, of Metrology, and its development regulations.

The accountants and converters within the scope of the Ministerial Order of 26 December 1988, and/or Directive 2004 /22/EC of the European Parliament and of the Council of 31 March 2004, shall have been placed in service in accordance with the applicable rules applicable to them.

Since October 30, 2006, the marketing and commissioning phase of the accountants and converters must comply with the provisions of Annex VI to Royal Decree 889/2006 of 21 July, which regulates the control of the State metrology on measuring instruments, and on their implementing rules that apply to them.

In those areas where there is no regulatory development, the provisions of this heading will apply.

7.1 Agents Responsibility.

The metrological control of the equipment, including the metrological verifications, will be carried out in accordance with the requirements of the competences, the execution and the obligations of the different agents, in Law 3/1985 and in the Royal Decree 889/2006, running the costs incurred by the subject holder of the equipment, except agreements signed between the parties or subrogated to them by one of the parties, signed prior to the entry into force of this protocol of detail.

7.2 General Requirements

As a general criterion, the competence framework for the implementation of the metrological control of the measurement systems, the agents involved in the measurement systems and their designation, as well as the requirements to be met, will be the ones defined in the current legal metrological regulation.

Regular metrological verification programmes of the measurement systems shall be established to ascertain whether they retain the required accuracy of measurement, or whether any of the elements required to be adjusted or repaired are necessary. constitute the system.

The periodic metrological verification of the counters, except for the ultrasonic, shall be performed by means of laboratories accredited according to the criteria of the ISO 17025 standard for the performance of calibrations of gas meters. In the case where the operating pressure of the counter is greater than 35 bar, the metrological verification shall be carried out by means of laboratories accredited in accordance with the criteria of ISO 17025 for the performance of calibrations of gas meters, using natural gas and at a pressure of more than 35 bar.

The periodic metrological verification of the ultrasonic counters must be performed "in-situ", applying a particular procedure which must have been previously approved by the parties concerned and included in the protocol of measurement.

The results obtained from it, if they are outside the error margins accepted by the applicable regulations, will result in regularisations.

When the operating conditions require high pressure metrological verification (greater than 35 bar) or the counter to be installed for the first time, the error curve resulting from the test at different flow rates shall be entered in the flow converter, in order to correct the errors in the usual operation flow rates of the counter.

The periodic metrological verification of the flow converters with their associated elements, pressure transmitter and temperature probe, must be performed "in-situ", with the necessary patterns.

At the points of the Gas System, the marketers affected by the measurement as well as the operators of the corresponding networks, will be authorized to demand their periodic metrological verification with the frequency that This is either regulated or set by this detail protocol.

As a general rule, the operators of the networks will be responsible for verifying that the periodic metrological verification of the measurement systems is carried out, taking as a basis the inventory of the measurement equipment of the points of the Gas System connected to its network, to ensure that all the equipment is subjected to metrological verification within the period established in this detail protocol. Where the holder of the measurement system does not fulfil his obligation, after a maximum period of three months after receiving the written notification, the operator of the network may request the verification of the agents. competent to do so by the operator of the costs incurred.

In the same way, distributors will be able to check whether the periodic metrological verifications of the measurement systems of the supply points connected to their networks have been carried out. Where the holder of the measurement system does not comply with his obligation, after a maximum period of three months after receiving the written notification, the distributor may request the verification of the agents. competent to do so by the operator of the costs incurred.

As a result of these periodic metrological verification processes, a verification certificate will be generated for each team in which the measurement accuracy will be reflected in each flow rate against the limit values. (a) acceptable as defined in the existing metrological legislation, or in its absence from the existing European Directive, or in its absence from the relevant UNE standard. In the periods when such equipment is out of service for the purposes of metrological verification, it must be previously agreed among the subjects involved in the consumption to be counted for the purposes of distribution, allocation or billing of the gas delivered or access services provided.

The provisions for periodic metrological verification shall also apply for metrological verification after repair or modification.

The repair/adjustment/modification shall be performed when there is a breakdown, or when the result of the periodic metrological verification so advises or by the agreement between the subjects involved.

If, as a result of periodic metrological verification, or failure, the counter must be repaired/adjusted, the team owner must install, as soon as possible or within a maximum of 5 days working, unless justified, an alternative counter during the time when the original counter is outside its location, except if the design of the installation allows another measurement line to be used during that period.

For the estimation of daily consumption, in cases where the consumer is the owner of the equipment, and when the period exceeds the maximum of 5 working days set, the estimated value of their daily consumption is calculate as the lowest value between the contracted daily flow rate and the maximum hourly rate of the counter for 24 hours.

In consumers with an obligation to be telematic, if, as a result of periodic metrological verification, or failure, the converter must be repaired/adjusted with its associated elements, pressure transmitter and temperature probe, the team holder shall install an alternate converter during the time the original converter is outside its location, except if the design of the installation allows for a measurement alternative during that period.

7.3 Regular metrological Verifications of measuring equipment.

The periodicities collected in this detail protocol should be adapted to any current higher-ranking regulations.

7.3.1 Transport network entry points.

In connection points of the transport system with regasification plants, international connections, deposits, underground storage and production plants of manufactured gases and gases from Non-conventional sources, the periodic metrological verifications corresponding to the conversion factor, pressure and temperature links, measurement and volume (serial test) shall be carried out on a monthly basis.

However, if after performing these monthly operations for a period of time, the errors are within the allowed tolerance you could, after agreement of the operators involved and the GTS, decrease the frequency indicated above, without the metrological verification period exceeding two months.

7.3.2 Transport network exit points.

Periodic metrological verifications shall be carried out at the frequency indicated in the following table:

Table 5: Periodic metrological Verifications of measurement equipment at the transport network exit points

Field

Field

	Periodicity	Test
6 months 1		Field
6 months 1	Field
Temperature link	6 months 1	Field
and volume (test serial)	6 months 1	Field
Cromatograph, Pattern Gas Change	The change of the pattern gas will be performed before the end date of the validity of the sample and always within of the conditions of use that are indicated in the certificate.	Field
verification of counters	6 years 2

1 If after performing these operations at the specified periodicity for a period of time errors are within the allowed tolerance, you could, after agreement of the operators involved and the Technical Manager of the System, decrease the frequency indicated above, without the metrological verification period exceeding twelve months.

2 Whenever the serial tests are performed each year and the result of the tests is within the required limits.

If the design of the installation does not permit the test in series, the metrological verification of the counter in the laboratory shall be every two years.

The counters to be installed must have a verification certificate less than 2 years old in all cases.

7.3.3 Endpoints to end consumers and delivery points between distribution networks.

The periodic metrological verifications of the measurement elements shall be performed as follows:

Counters:

The frequency of the metrological verification of the counters shall be as shown in the table below:

Table 6: Regular metrological Verifications of Counters

	Annual consumption per line (C) (GWh/year)
Counter Type	C ≤ 3 (*)	3 < C ≤ 30	C > 30 (**)
Turbine	4 years	4 years	2 years
Piston	6 years	6 years	NA
Membrane	15 years	15 years	NA

(*) In counters installed in domestic installations, the operational indicated by continuous sampling statistical techniques may be replaced.

(**) If the design of the installation permits, annual series test and meter verification of the counter at most every 6 years.

The counters to be installed must have a verification certificate less than 2 years old.

Measure Loops:

The frequency of the metrological verification of the measurement loops (pressure transmitter and temperature probe) shall be as shown in the following table:

Table 7: Periodic metrological Verifications of Pressure and Temperature Measurement Ties

(C) (GWh/year)	C ≤ 5	5 < C ≤ 100	100 < C ≤ 1,000	C > 1,000
Periodicity	4 years	2 years	1 year	6 months

The converters to be installed must have a verification certificate of at least half of the corresponding verification period.

Chromatographers:

The standard gas cylinders shall be certified by an accredited laboratory for the analysis of natural gas in accordance with ISO 17025.

The change of the pattern gas shall be made before the end date of the validity of the sample and always within the conditions of use indicated in the certificate.

The periodic metrological verification of the chromatograph shall be carried out at least every 12 months and whenever the change of the standard gas is performed.

7.4 Extraordinary checks at party request.

In addition to the metrological control obligations that may be derived from Law 3/1985, Metrology, of Royal Decree 889/2006, which regulates the metrological control of the State on measuring instruments, and its For all the measurement points of the Gas System, any subject affected by the measure may require the extraordinary verification of the measurement installation in those situations where it exists. justified presumption of incorrect operation of the installed measurement equipment.

In such cases, the scope of the extraordinary check shall be identical to that of the periodic verification provided for in the metrological control, and these operations must be carried out on the measuring equipment by competent agents for carry out metrological checks as soon as possible and in any event respect the continuity of supply. The costs incurred by the extraordinary verification of the measuring equipment shall be borne by the applicant unless the metrological control of the measuring equipment confirms the existence of a deviation higher than the permissible deviation, in which case they shall be position of the team holder.

8. Regularisation of readings and measurements.

In cases of periodic metrological verification, verification after repair or modification, and/or extraordinary verification performed at the request of part of the measurement equipment or quality analysis, if observed the permitted tolerances for the equipment in question shall be exceeded, the adjustment of the supplies effected in accordance with this paragraph shall be carried out.

In the case of detecting errors exceeding the permissible tolerances, the quantities previously determined from the original readings shall be corrected and adjusted. The regularization of the quantities shall be extended to a certain period of time prior to the date of completion of the verification which detected the error and shall be established on the basis of the following criteria.

The period of time to be corrected and the additional rebilling to be carried out shall be calculated in accordance with the provisions of the legislation in force.

The GTS will publish on its website the standard procedure for calculating regularisations derived from excess over the maximum permitted tolerances.

Once the error is known, as long as the cause of the error is not remedied, the limitations of the time period concerned will not be applicable and, consequently, this period will be extended to the total duration of the cause, without prejudice to the liability which could result from the failure to rectify the error detected. The correction by quantity to be applied during the period concerned shall be that corresponding to the excess exceeding the maximum permissible error.

9. Odorization of natural gas.

The gas must be odorized so that any leakage can be easily detected by normal human smell when there is a mixture whose volumetric concentration is a fifth of that corresponding to the lower limit of the flammability.

9.1 Agents Responsibility.

Primary network carriers will deliver the odorized natural gas in the inputs to the transportation system, in the inputs to the distribution networks, and to the consumers directly connected to their networks.

To optimize the installation costs, in the case of new secondary transportation facilities where the gas destination is basically domestic consumption, the responsible for the odorization up to the levels indicated in Paragraph 9.3 shall be the holder of the secondary transport-transport point.

Distributors must ensure that natural gas delivered to consumers has the characteristic odour, adding odorising compounds in the proportion needed when necessary, in such a way as to detect their presence.

The levels of odorization, if any, of transport pipelines for transit to third countries will be agreed by the carriers involved.

9.2 Odoring requirements.

The odorant used must meet the following conditions:

-Provide a characteristic and persistent odor.

-Provide a specific odor not to be confused with other odours found in the correct: odor of petroleum derivatives, combustion gases, kitchens, perfumes, etc.

-Easy to manipulate and add to the gas.

-Non-toxic in concentrations added to the gas.

-Insoluble in water and soluble in gas phase.

-Invert the different types of materials used in the pipes and little absorbed by the waste that can be found inside the network.

-Unabsorbed by the terrain.

-Combustion without production of harmful products.

-Chemical stability against gas components.

9.3 General criteria for odorization.

Primary network carriers will deliver the odorized natural gas, following the following criteria:

a) Add 15 mg of THT/m3 of gas in the inputs to the transport-distribution system.

(b) Add 7 mg of THT/m3 of gas in deliveries to secondary transport which is currently being odorated by the primary carrier.

c) Add 7 mg of THT/m3 of gas in the inputs to the distribution networks with domestic consumption.

d) For the odorization of the ring of 35 bar Barcelona, they will be added to the output of the regasification plant 22 mg of THT/m3 of gas.

In cases b) and c) feeding networks with domestic consumption it is recommended that in this case the minimum odorant content is 18 mg of THT/m3 of gas.

In case of use of a different odoring product than THT, the concentration of odoriant to be added shall be adequate to obtain an equivalent level of detection.

When the gas received has any odoring content, it will have to be analyzed of what type of odorant is treated and what compatibility it will have with it, since it could be the case that the added one would counteract the effect of the smell of the gas received.