Hydrostatic Test
Definition
A hydrostatic test is a pressure test performed on scuba cylinders to ensure structural integrity and safety under high pressure.
More on Hydrostatic Test
Scuba tanks are periodically subjected to hydrostatic tests to check for cracks, thinning, or deformation under pressure. This test ensures a tank can withstand its rated fill pressure without rupturing. The cylinder is filled with water and pressurized 1.5 times its working pressure. The expansion is measured to detect damage. In the U.S., hydro tests are required every 5 years, and a passed test is stamped on the tank shoulder.
Frequently Asked Questions
They confirm a tank can safely hold high-pressure air without structural failure, preventing catastrophic accidents.
In the U.S., every 5 years. Some countries or facilities may have stricter schedules.
It’s condemned and removed from service. Some failures are due to corrosion, cracks, or excessive expansion.
No. Visuals are annual and check for external/internal damage, while hydro tests actual pressure resistance.
Yes, especially older models with known alloy issues. Regular testing ensures continued safety.