Gas Cylinder Storage and Handling Flashcards
7 cards from real F60 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Gas Cylinder Storage and Handling flashcards as text
Before attaching a regulator to a compressed gas cylinder, what brief preparatory action should be performed with the cylinder valve?
Answer: 'Crack' the valve momentarily to clear any debris
'Cracking' the valve briefly expels dust and debris from the outlet that could contaminate the regulator or become an ignition hazard.
Which fuel gas commonly used in torch operations is lighter than air and rises when it leaks?
Answer: Acetylene
Acetylene has a specific gravity of approximately 0.9, making it lighter than air, so it rises and disperses upward when released.
To prevent dangerous decomposition, acetylene must not be used at pressures exceeding what limit?
Answer: 15 psi
Acetylene can spontaneously and violently decompose when used at pressures above 15 psi, creating a severe explosion risk.
When propane leaks in an enclosed space, where does the greatest risk of accumulation occur?
Answer: At floor level, since propane is heavier than air
Propane has a specific gravity of about 1.5, so it sinks and accumulates at floor level, where it can reach explosive concentrations.
What is the correct and safe method for checking torch equipment connections for gas leaks?
Answer: Apply soapy water and watch for bubbles
Soapy water produces visible bubbles at leaking connections, providing a safe and reliable detection method without introducing any ignition source.
What is the correct sequence for shutting down torch equipment at the end of a work period?
Answer: Close cylinder valves first, bleed gas from lines through the torch, then close torch valves
Closing cylinder valves first and bleeding lines through the torch ensures no pressurized gas remains trapped in hoses and regulators, preventing hose burnback.
During torch operations, what minimum clearance must be maintained between the torch flame and combustible materials?
Answer: 6 feet
A minimum 6-foot clearance from combustible materials is required during torch operations to prevent accidental ignition of nearby materials.