Valve Seat Leak Test Duration. ASME b16.34 require the seal leak test be performed 15 seconds for valves with size less than 2 inch and 30 seconds for valves between 2 1/2 to 8 inch, 60 seconds for valves between 10 and 18 inch and 120 seconds for valves greater than 20 inch. The API 598 timing requirement is similar.
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