What should be the air fail action for depressuring valves installed, or nominated, to avoid a BLEVE when fire surrounds a pressure vessel?

Could anyone provide information or a source for "universal pipe flanges"?

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I am reviewing the retrofitting of remote electrical transformer substations for compliance with the SPCC rules and have a couple of questions.

I am trying to determine in which standard the p/T ratings of PN designated valves is given. Or in other words, when a valve is stated to be PN16 Rated - to which standard is is rated as such?

Can anyone share philosophy of Automatic Block Valve and emergency block valve? What are considerations in view of piping design.?

I am trying to figure out the flow rate of nitrogen through a 1" line. I have a high pressure (40 lb) nitrogen flowing in a 1" line. Can anyone direct me in finding charts that would correlate press

Does anyone know how hydraulic lash adjusters bleed the air out of themselves? The type i'm specifially asking about in this case reside in the head.