33 CFR 159.109 - Pressure test.
Any sewage retention tank that is designed to operate under pressure must be pressurized hydrostatically at a pressure head of 7 feet or to 150 percent of the maximum pressure specified by the manufacturer for operation of the tank, whichever is greater. The tank must hold the water at this pressure for 1 hour with no evidence of leaking.
Title 33 published on 2013-07-01
no entries appear in the Federal Register after this date.