Thank you all for your replys. The one thing that no one addressed was locking the valve in the open position during normal operations. In this scenario, the short piping section is always in constant communication with the rest of the piping run, so there can be no pressure buildup. The only...
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...
