Originally Posted by Isaacx
Hey guys -
It's been a while since I played so I had to hydro my tank. The cylinder passed no problem, but the shop said the 1.8K burst disc blew when they were trying to refill it. I thought no big deal. Bought a new one, put it in, first day at the field and it blew at 2.5k-ish psi. Thought it was a dud burst disc. Replaced it again, and same exact thing happened.
My main question is whether or not the burst discs are in the right location. I have the offset type, and the 7.5K burst disc is in the higher location, and the 1.8K burst disc is in the lower position. Can someone help me out and identify my reg? I've read some regs always have the lower pressure disc in the upper location.
I'm not sure of the manufacturer of that reg, maybe an early PMI or variation of the reactor reg but, I believe you currently have the burst disks reversed. Is there any markings either above or below the burst disk ports that may note high and/or low?
With most tank regs, the low side disk (1.8K) is closest to the output end and the high side (7.5K) is closest to the tank. Here is a pic I grabbed from the original patent that shows how the high side disk receives air pressure at same psi as tank fill pressure. The low side disk is downstream of the reg seat and, therefore, would receive only a pressure of tank output:
I would suggest switching the burst disk locations and service the reg while you have the tank empty.