Question

How often do you have to hydro a scuba tank?

Answer 1

A hydrostatic test must be performed every five years. During this test the cylinder is overfilled to a specified amount and its permanent expansion is measured. If the cylinder meets passing criteria the test date is permanently stamped on the cylinder

Visual inspections must be performed on an annual basis. During this test the inside and outside of the cylinder is inspected for signs of cracks, pits, rust, or corrosion. The test date is marked on a sticker that is placed on the tank as evidence of the inspection.

Answer 2

I get my tanks hydro'd every 5 years as required as they are used. I have a bunch of tanks which I don't use all of. There are a few that are used more than others. So if I have a tank that is not used for a year after the dyfpdro expires it will get hydro'd after its next use. I don't keep track of the dates. I just use them and my LDS will check the hydro stamp when filled. If it needs to be done it gets done and I have other tanks I can use in the mean time