Standard for leakage testing automatic on-off valve 3

[james370]

For automatic on-off valve(ball valve), should I test seat leakage according to standard ANSI FCI 70-2(similar with Globe control valve) or API-598 (similar to all type manual valves)

 

[bcd]

For on-off ball valves, use ASME B16.34 or API-598. Only case I can think of for using FCI 70-2 (control valves) is if you happen to have a metal seated, characterized insert or other specialty ball valve that is designed to be used as a control valve.

 

[bj45]

Valve should be tested by API-598 as it is a block valve.

 

[JLSeagull]

I agree with bcd and bj45. FCI 70-2 publishes leakage rate classifications because control valves are expected to leak. On/off isolation valves are expected not to leak.

The leakage rate for metal seated ball valves within API STD 598 is similar to ANSI/FCI 70-2. API 598 requires zero bubbles per minute seat leakage for resilient seated isolation valves. Some manufacturers of triple offset butterfly valves offer the resilient seated specifications.

 

[NGiLuzzu]

For more details about the issue in object, You may want to take a look at the following threads within this Forum:


- thread408-265522;

- thread408-260420;

- thread408-216962;

- thread408-210466;

- thread408-172347;

- thread408-150132;

- thread408-139863;

- thread408-122060;

- thread408-76110;

- thread408-23297...


Hope this helps, 'NGL


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