My question pertains to the placement of HRVs on extremely short sections of pipe between a manual shut off valve and a blind flange. The fluid being used is anhydrous ammonia and we have the ability to lock the manual valves open if necessary. All of the resources I have found require an HRV on a section of pipe between 2 or more shut off valves, but none of them make mention of the situation between 1 valve and a blind flange. Any help would be greatly appreciated.
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