Not So Fast... Check the BLOW pressure
- I got excited looking at that source until I read the descriptions. The 3,000 psi burst disks are "3,000 working pressure, 5000 blow". So, they're for standard 3000 psi tanks, not vintage 1800 psi tanks.
- For my Twin 38s (1800 psi working pressure), I've been ordering the 3360 Burst Disks from DGX... Because that's as low as they go AND, they say "Ratings are release pressure, not service pressure". Here's my thinking:
- If you figure an 1800 psi tank is okay for 10% overfill... We're almost talking about a 1980 psi working pressure. 5/3rds of that is 3300 psi. So, if you can't find any 3000 psi "blow" disks, 3360 is at least in the ball park. Here's the link for DGX Burst Disks:
https://www.divegearexpress.com/prd-saf ... t-disk-kit
-Of course if we can find Burst Disks that blow at 3000 psi, that's what we should use. But I can't find any so I use the next best thing.
Two Ways Burst Disks are Specified
1. Some are sold by the "working Pressure" of the tanks (3000 psi and 2250 psi) . NE Supply
2. Some are sold by the "Blow Pressure" of the Burst Disk (3360 psi and 4000 psi). DGX
- If "blow" or "release" is not in the description, you can't know what you're buying.
P.S. I did a lot of looking around a few years ago. There are 1800 psi tanks everywhere an d there should be burst disks for them. Fire Extinguishers for example. I could not get them through fire extinguisher companies nor extinguisher service companies. I also looked into Paintball... And I found 1800 psi burst disks and a lot of others... But when I got them, the ends had the same threads but were made for different sealing systems... They wouldn't work and could not be made to work. My DGX 3360 "Blow" disks are what I settled on and I'm happy to have a definite answer and rationale.