Division 4.12.3
The seat of a shut-off valve, when in the closed position, shall not leak at a rate exceeding 10 cm3/hour at any gas pressure between zero and the Maximum Allowable Working Pressure (MAWP).
The seat of a shut-off valve, when in the closed position, shall not leak at a rate exceeding 10 cm3/hour at any gas pressure between zero and the Maximum Allowable Working Pressure (MAWP).