in_cavediver
Contributor
mikswi:LOL!! Yep
What people need to realize is that its very unsafe to fill a tank at a lower temp then it will be stored in.
Its important to know that for every degree in temp a tank changes, the pressure changes by 5psi. so, if you fill a tank during the summer in a "cool" liquid, then send it out the door to a customer at a full fill. Then he puts it in his trunk or in the direct sunlight while transporting it, there is a very REAL possibility that the burst disk could rupture.
Have a guy come back into the shop accusing you of not filling his tank and you will become familiar with these types of physics.
OK, Given your statement that for each 1 degree in temp, 5psi change. Lets assume the worst.
Fill to 3000psi. Increase ambient temp by 100 degree's. Thats only 500psi more for a total of 3500psi. I have personally seen an al 80 filled to 3800psi. It didn't blow the disc. (and we chewed out the fill guy as well)
disclaimer: NEVER intentionally and significantly OVERFILL AL TANKS!!!! Very BAD idea
Mike