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Number of pressure cycles in valves for fatigue

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raton

raton

Marine/Ocean
Jul 21, 2010
20
ES
Hi All.
I have a question regarding the number or cycles for a valve during a pressure fatigue test

I have in front of me a technical specification where the number of pressurization cycles depending at pressure test (based on the MAWP) are:

68.000 pressure cycles @ 1,5 MAWP
175 pressure cycles @ 1,2 MAWP
35 pressure cycles @ MAWP

Do you know if there is any standard or rule with the above values or do you think that those values are specific for a manufacturer?

Thank you very much for your help

Jaime

 
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