Why minimum duration is assigned for valve testing in API 6D?

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Elhadi I. Dekam

These limits represent the minimum acceptable time period, hence the required and more acceptable could be longer. This is due the relation between time and material failure. This could be clear for transient pressure wave, where for only wave pressure pulse (nearly no time) could be no damage, otherwise damage could be happened.

Hamit Can

https://law.resource.org/pub/us/cfr/ibr/002/api.6d.2008.pdf

http://www.valve-world.net/pdf/API_598_Valves_Inspection_and_Testing.pdf

http://globalsupplyline.com.au/wp-content/uploads/2014/09/API6D-Valve-Insp-Testing.pdf

Asad Ali Zaidi

Following.