Equipment Inspection and Maintenance Flashcards

What is the maximum allowable hose length typically recommended for portable torch setups to maintain safe pressure?

Answer: 25 feet (approximately 7.5 meters)

Standard practice limits portable torch hoses to approximately 25 feet to maintain adequate working pressure and reduce the volume of gas in the hose.

When storing torch hoses after use, what is the correct procedure?

Answer: Bleed pressure from hoses, coil loosely, and store away from heat and sunlight

After use, hoses must be depressurized, coiled loosely to prevent kinking, and stored away from heat and ultraviolet light which degrade the rubber.

What type of lubricant is strictly forbidden on oxygen equipment fittings?

Answer: Petroleum-based oils or grease

Petroleum-based oils or greases must never be used on oxygen equipment because they can ignite spontaneously when exposed to high-pressure oxygen.

If a regulator gauge needle does not return to zero when the cylinder valve is closed, what does this indicate?

Answer: The regulator has an internal leak or faulty gauge

A gauge needle that fails to return to zero after the cylinder is closed indicates an internal leak within the regulator body or a faulty gauge that requires service.

What must be checked on a torch before connecting it to gas hoses for the first time?

Answer: That all valves are closed and the equipment is free from damage or contamination

Before connecting, verify all torch valves are fully closed and inspect the equipment for damage, contamination, or signs of oil — open valves on connection can cause a surge.

Which thread connection standard is commonly used on fuel gas (left-hand thread) fittings to prevent accidental cross-connection with oxygen fittings?

Answer: CGA (Compressed Gas Association) left-hand threads on fuel gas fittings

CGA standards require left-hand threads on fuel gas fittings so that oxygen and fuel gas connections cannot be accidentally interchanged.