4725.2750 SCREENS; SCREEN LEADERS, RISERS, AND SUMPS.
If a screen is attached or connected to the casing, the connection must be made by a threaded, solvent-welded, or welded joint, or by a nontoxic packer. Lead packers must not be used. A screen riser or leader must not extend more than 21 feet above the screen. A screen sump must not extend more than ten feet below the screen. The total combined length of screen riser or leader and screen sump must not exceed 21 feet. A screen riser, leader, or screen sump must comply with the confining layer requirements of part 4725.2020, subpart 1a. Multiple screens separated by a screen riser, leader, or sump are not permitted.