Tank Size

[greenje]

Hi Scott,

My understanding is that most steel tanks need to be filled to the 10% overfill to reach their full capacity. I have several very old steel 72 tanks as well. Their service pressure is 2250 psi and with the 10% overfill they can go to 2475 psi. However, they only contain the full 72 cu ft of air at 2475.

I've heard that steel tanks used to only get the plus rating when they were new, but I don't think that is the case anymore. My old steel 72s all got the plus rating at their last hydro. All of the shops that I use automatically overfill the tanks by 10% if they have the plus rating. And assuming you've got the plus rating, I wouldn't be at all hesitant about using them at that pressure.