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Shell Closure
Duration of Required Test Pressure Refer to API Standard 598
Minimum Test Duration (seconds) a
1515 15
Other Valves
Backseat
60
Valve Size (NPS) Check Valve
(API 594)
Check Valve
(API 594)
Other Valves
60
1/2
3/4
1
1 1/4≤ 2
60603
60 60 60
1 1/2
2
2 1/2
2 1/2 - 64
6
a
120120 300
8 - 12
≥ 14
8
10
60 120
120
12
14
Larger than 14
60 120 60 60
aThe test duration is the period of inspection after the valve is fully prepared and is under full pressure.
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