My goal is to keep my steel tanks in service as long as possible. I expect them to outlast me.
I used to pick my tanks up and find that they were being filled about 10% PAST the rated 10% overfill (i.e. 20% overfilled) until I asked the LDS to please only fill my tanks to the marked pressure. When I would receive the tanks over filled like that, I would bleed the air down with the idea that the less time at that higher pressure would cause less long-term damage. However, I don't think that 20% would normally exceed the pressure necessary to cause permanent expansion. The fact is, I don't know where that limit is, or whether duration at a pressure above or below that limit would increase the amount of damage done or not.
I have some 1980 psi (1800 + 10%) 50s which I just recently picked up having been pumped to 2500 psi- nearly a 40% overfill, and nearly the pressure which could burst the disc. Obviously, the person forgot to change the pressure setting after having filled my 72s.
I realize that 40% overfill is not close to hydrotest pressure on these tanks, but I'm curious what it takes to exceed the elastic limits. I bled them down to 2000 psi because they will be stored for several days before being used again, but I don't know if that really helped to prevent the possibility of further damage or not (assuming the elastic limits were exceeded). Is time a factor?
Any thoughts on this?
I used to pick my tanks up and find that they were being filled about 10% PAST the rated 10% overfill (i.e. 20% overfilled) until I asked the LDS to please only fill my tanks to the marked pressure. When I would receive the tanks over filled like that, I would bleed the air down with the idea that the less time at that higher pressure would cause less long-term damage. However, I don't think that 20% would normally exceed the pressure necessary to cause permanent expansion. The fact is, I don't know where that limit is, or whether duration at a pressure above or below that limit would increase the amount of damage done or not.
I have some 1980 psi (1800 + 10%) 50s which I just recently picked up having been pumped to 2500 psi- nearly a 40% overfill, and nearly the pressure which could burst the disc. Obviously, the person forgot to change the pressure setting after having filled my 72s.
I realize that 40% overfill is not close to hydrotest pressure on these tanks, but I'm curious what it takes to exceed the elastic limits. I bled them down to 2000 psi because they will be stored for several days before being used again, but I don't know if that really helped to prevent the possibility of further damage or not (assuming the elastic limits were exceeded). Is time a factor?
Any thoughts on this?