FE Recharging & Hydrostatic Testing Flashcards

What is the correct hydrostatic test pressure for a stored-pressure dry chemical extinguisher rated at a 195 psi service pressure?

Answer: The test pressure is stamped on the cylinder and typically 1.5–2× service pressure

The hydrostatic test pressure is stamped on the cylinder by the manufacturer and is typically 1.5 to 2 times the service pressure.

What information must be recorded on a fire extinguisher after hydrostatic testing?

Answer: Test date, test pressure, and tester identity stamped or labeled on the cylinder

After hydrostatic testing, the test date, pressure used, and the identity of the testing facility must be permanently marked on the cylinder.

During hydrostatic testing, what condition in the test water indicates a cylinder must be condemned?

Answer: Leakage, deformation, or failure to hold test pressure

Any leakage, permanent deformation, or inability to hold the test pressure means the cylinder must be condemned and removed from service.

Which regulatory authority governs the hydrostatic testing of fire extinguisher cylinders in the United States?

Answer: DOT (Department of Transportation)

The DOT regulates the design, manufacture, testing, and marking of pressure vessels including fire extinguisher cylinders.

What type of hydrostatic test method involves filling the cylinder with water, pressurizing it, and measuring permanent expansion?

Answer: Water jacket test

The water jacket test measures total and permanent expansion by immersing the pressurized cylinder in a water-filled jacket and recording displaced water.

What maximum permanent expansion percentage typically requires a cylinder to be condemned during hydrostatic testing?

Answer: 10%

A cylinder exhibiting permanent expansion exceeding 10% of total expansion is typically condemned as structurally compromised.