Fire Extinguisher Hydrostatic Testing

fire extinguisher hydrostatic testing
Fire extinguisher hydrostatic testing equipment

What is a fire extinguisher hydrostatic testing? Whenever you have a bottle under pressure, it’s very important that you have stress tested before putting to hard use. The hydro static test will test your tube strengths and weaknesses. The test including leakage and abnormalities of the form of the fire extinguisher body. However, a hydro static test required every 12 years.

What is fire extinguisher hydrostatic testing?

During the hydro static test, your fire extinguisher filled with water or oil. Then, pressurized to test the integrity of the hull. After the tube pressurized, the valve will be closed to check for deformation of the fire extinguisher tube. Sometimes this procedure using colorful liquid to make it easier to see.

Security considerations

During the fire extinguisher hydrostatic testing, your tube pressurized 120-140% of the standard load. This high pressure will indicate whether the weakened structural firefighting has become over the years. If the fire extinguishers have been weakened, it can fail or explode when in use. Also, posing a high risk for the operator and every person in the building.

How does fire extinguisher hydrostatic testing procedures?

To learn how fire extinguisher hydrostatic testing work to check the cylinder, let’s look at the procedure.

First, the fire extinguisher will be removed and the valve wires in the cylinders inspected for corrosion, pitting and other anomalies. If the cylinder passes the visual inspection, it placed in a steel Chamber. Then, filled it with water at normal pressure. The sight glass attached to the sides of steel space will show zero, indicating a normal water pressure in chamber.

High pressure applied to the water inside the cylinder fire extinguisher. As the pressure increases, the cylinder expands and pushes water into the sight glass. Then, after the pressure released, the cylinder will contract and the water will move from the sight glass to steel container. Depending on the results, the tester will pass or fail. The cylinders usually considered harmful and will fail if:

1. The water level in the sight glass continues to increase while the specific pressure applied. This caused by a leak from inside the cylinder water in the steel container, continuous expansion of the wall or cylinder, which will cause reasonable failed cylinder.

3. Cylinder extends and the pressure released does not return to its original size, it means that the metal cylinder not quite tough considered safe to use. The sight glass cannot have more than 10 percent of the displaced water left after the pressure released. For example, if the expansion had moved 110 milliliters of water after it had contracted, it should read 10 ml or less to pass the test.

Fire extinguisher hydrostatic testing frequency

NFPA requirements stipulate that a fire extinguisher must have a hydro static test every 12 years. Depending on the type of fire extinguishers that you have. The fire extinguisher emptied and hydro statically tested at intervals specified in table L-1. Fire extinguisher cartridge that failed the fire extinguisher hydrostatic testing removed from service and place of work. The reason is for the safety of employer.