F60 Gas Cylinder Storage and Handling 2

Question 1

Before attaching a regulator to a compressed gas cylinder, what brief preparatory action should be performed with the cylinder valve?

Accepted Answer

'Crack' the valve momentarily to clear any debris

Answer

'Cracking' the valve briefly expels dust and debris from the outlet that could contaminate the regulator or become an ignition hazard.

Question 2

Which fuel gas commonly used in torch operations is lighter than air and rises when it leaks?

Accepted Answer

Acetylene

Answer

Acetylene has a specific gravity of approximately 0.9, making it lighter than air, so it rises and disperses upward when released.

Question 3

To prevent dangerous decomposition, acetylene must not be used at pressures exceeding what limit?

Accepted Answer

15 psi

Answer

Acetylene can spontaneously and violently decompose when used at pressures above 15 psi, creating a severe explosion risk.

Question 4

When propane leaks in an enclosed space, where does the greatest risk of accumulation occur?

Accepted Answer

At floor level, since propane is heavier than air

Answer

Propane has a specific gravity of about 1.5, so it sinks and accumulates at floor level, where it can reach explosive concentrations.

Question 5

What is the correct and safe method for checking torch equipment connections for gas leaks?

Accepted Answer

Apply soapy water and watch for bubbles

Answer

Soapy water produces visible bubbles at leaking connections, providing a safe and reliable detection method without introducing any ignition source.

(F60) Certificate of Fitness for Fire Guard for Torch Operations Practice Test