As per shell dep, chemical injection points shall have a non return valve upstream the block valve to avoid utility contamination, in case I have a two diaphragm pumps each dosing pump has it's own check valve and the distance from the injection point is 12m, can I delete the check valve at injection point ? Do you see that it's necessary to have the check valve at injection point, Until now I never saw a chemical injection point without a check valve, and I'm confused.
Thank you
Edited by Lyne, 15 May 2024 - 12:03 AM.