certifiedAtlantic Fire & Safety technicians are trained, certified and licensed by the Province of NB – Department of Public Safety for our service of hand portable fire extinguishers.

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Hydro-Testing – Low Pressure and High Pressure

Pressurized cylinders require hydro-testing at regular intervals.  This test process checks the integrity of the metal cylinder. During this process, the cylinder is emptied, filled with water; the cylinder is then pressurized to check for weakness in the metal.  If it passes the testing it is then labeled and or stamped, dried, filled; ready to be put back into service.

Fire Extinguishers

Dry chemical, class K, and pressurized water fire extinguishers undergo a low pressure hydro test.  Dry chemical is tested in 12 year cycles while pressurized water and class K are tested in 5 year cycles.

CO2 fire extinguishers undergo high pressure hydro-testing in 5 year cycles.

Cylinders - SCBA, SCUBA, CO2, Cascade

Cylinders requiring high pressure testing such as those used for SCBA, SCUBA, Cascade systems, CO2, or Paintball are hydro-tested within a safety tank.  These are tested in 3-5 year cycles.

split co2Failed Hydro-test

You can see where this CO2 cylinder, with 4mm thick steel walls, split after being pressurized during the hydro-test procedure.  The extinguisher was manufactured in 1952 and had not been tested until 1994.  If this CO2 extinguisher had been tested in proper intervals of 5 years, it would have shown signs of metal fatigue sooner, and failed the hydro-test without exploding.

Fortunately, this occurred in the safety of the test tank out of harms’ way.

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