The actual proper name for the big heavy thing we use to go diving is a cylindrical pressure vessel. A tank is the proper term for an unpressurized container like a fuel tank. The people who make pressure vessels for diving, call them high pressure compressed gas SCUBA cylinders. However, SCUBA tank or dive tank is the term used by nearly all divers.
All cylinders are filled to their working pressures. For a standard aluminum 80 cu. ft. tank with a working pressure of 3000 psi, a normal fill will be 2800-3200 psi. We do fill tanks with working pressures up to 3500 psi. We do not over pressurize tanks. Tank pressure gauges are available at our Dive Centre. Please check your fill before leaving the Dive Centre. If you have a fill that is more than 200 psi below the working pressure of the cylinder, please ask the store staff to top off your tank or check for a leak. All cylinders must have current hydrostatic inspections and visual inspections.