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.