1513.1100 Minimum Flow Rates


Published: 2015

Subscribe to a Global-Regulation Premium Membership Today!

Key Benefits:

Subscribe Now for only USD$20 per month, or Get a Day Pass for only USD$4.99.
1513.1100 MINIMUM FLOW RATES.

Pressure relief valves for excessive heat or fire protection used on containers covered by parts 1513.0300 to 1513.0380 and 1513.1000 to 1513.1070 must be constructed to discharge at not less than the rates required in this part before the pressure is in excess of 121 percent of the maximum allowable working pressure of the container. Relief protection for any other reason, except refrigerated storage, must use ASME UG-125 through UG-136.


Surface
Area,
Sq.Ft.
Flow Rate,
CFM
Air
Surface
Area,
Sq.Ft.
Flow Rate,
CFM
Air
Surface
Area,
Sq.Ft.
Flow Rate,
CFM
Air









20
258
185
1,600
900
5,850


25
310
190
1,640
950
6,120


30
360
195
1,670
1,000
6,380


35
408
200
1,710
1,050
6,640


40
455
210
1,780
1,100
6,900


45
501
220
1,850
1,150
7,160


50
547
230
1,920
1,200
7,410


55
591
240
1,980
1,250
7,660


60
635
250
2,050
1,300
7,910


65
678
260
2,120
1,350
8,160


70
720
270
2,180
1,400
8,410


75
762
280
2,250
1,450
8,650


80
804
290
2,320
1,500
8,900


85
845
300
2,380
1,550
9,140


90
885
310
2,450
1,600
9,380


95
925
320
2,510
1,650
9,620


100
965
330
2,570
1,700
9,860


105
1,010
340
2,640
1,750
10,090


110
1,050
350
2,700
1,800
10,330


115
1,090
360
2,760
1,850
10,560


120
1,120
370
2,830
1,900
10,800


125
1,160
380
2,890
1,950
11,030


130
1,200
390
2,950
2,000
11,260


135
1,240
400
3,010
2,050
11,490


140
1,280
450
3,320
2,100
11,720


145
1,310
500
3,620
2,150
11,950


150
1,350
550
3,910
2,200
12,180


155
1,390
600
4,200
2,250
12,400


160
1,420
650
4,480
2,300
12,630


165
1,460
700
4,760
2,350
12,850


170
1,500
750
5,040
2,400
13,080


175
1,530
800
5,300
2,450
13,300


180
1,570
850
5,590
2,500
13,520


Surface Area = Total Outside Surface Area of Container in Square Feet. If the surface area is not stamped on the nameplate or when the marking is not legible, the area can be calculated by using one of the following formulas:


(1)
Cylindrical container with hemispherical heads
Area = overall length in feet times outside diameter in feet times 3.1416.


(2)
Cylindrical container with other than hemispherical heads
Area = (overall length in feet plus 0.3 outside diameter in feet) times outside diameter in feet times 3.1416.


(3)
Spherical container
Area = outside diameter in feet squared times 3.1416.


Flow Rate--CFM Air = cubic feet per minute of air required at standard conditions, 60 degrees Fahrenheit and atmospheric pressure (14.7 psia).
The rate of discharge may be interpolated for intermediate values of surface area. For containers with total outside surface area greater than 2,500 square feet, the required flow rate can be calculated using the formula, Flow Rate CFM Air = 22.11 A0.82 where A = outside surface of the container in square feet.


CONVERSION FACTORS:


ft2

x 0.092 903 = m2



CFM
x 0.028 317 = m3/min


ft
x 0.304 8 = m