29 CFR 1926.350: Gas welding and cutting

Question 1

A crew needs to move an oxygen cylinder to a different work area on a flatbed truck. The cylinder is not on a special carrier. Which action is required before the cylinder is moved?

1. AOpen the valve slightly to bleed off line pressure
2. BLay the cylinder on its side and chock it so it cannot roll
3. CLeave the regulator attached so the valve is not exposed to damage
4. DRemove the regulator and put the valve protection cap in place

Question 2

A welder on a construction site starts the day shift with an oxy-fuel cutting torch that was used and put away without incident by the night shift. Before lighting it, she opens the gas supply and hears a faint hiss and sees bubbles forming in a soap-solution test at the hose coupling nut. A coworker says the torch was fine yesterday and she can just tighten it later if the leak gets worse. What does the standard require?

1. AUse the torch but relight it only with a match so that any leaking gas burns off safely at the coupling
2. BContinue using the torch, since the leak is at a coupling rather than at the tip and the torch passed use during the previous shift
3. CDo not use the torch because the leaking coupling is a defect found at the start-of-shift inspection; it must be repaired or replaced first
4. DDefer the inspection until the end of the shift, when the torch can be checked for leaks while it is still warm

Question 3

A contractor runs oxy-fuel cutting on a two-shift schedule. The day crew inspected the oxygen and acetylene hoses at the start of their shift and found them in good condition. When the night crew arrives, the lead says the hoses were already checked that day, so they can start cutting right away. No incidents were reported during the day shift. What does the standard require?

1. AThe night crew must inspect the hoses at the start of their own shift and remove any defective hose from service.
2. BNo new inspection is needed, because the hoses passed inspection earlier the same day and no flashback was reported.
3. CThe hoses need re-inspection only if the night crew sees visible damage while cutting.
4. DThe hoses must be pressure tested at the start of the night shift before they are used.

Question 4

A crew will keep several compressed gas cylinders inside a building overnight. The supervisor compares four possible locations. Which location complies with the standard for indoor cylinder storage?

1. AA lockable steel locker with solid walls and a closed door, chosen so unauthorized people cannot tamper with the cylinders
2. BA marked, assigned spot in a dry, well-ventilated room, away from stairs and traffic lanes, with nothing stored overhead that could fall
3. CAn open floor area at the foot of a stairway, chosen because it is close to where the cylinders will be used
4. DA spot directly under a shelving rack of loose tools and materials, in a dry and well-ventilated room

Question 5

A welder opens the valve on an acetylene cylinder and smells gas. Soapy water shows bubbles around the valve stem. She closes the valve and tightens the gland nut, but when she reopens the valve the stem still leaks. The cylinder is still about half full, and the crew wants to finish the shift's work. What action does the standard require?

1. AAttach the regulator and keep using the cylinder, since a regulator can stop a leak
2. BDiscontinue use of the cylinder, tag it properly, and remove it from the work area
3. CMove the cylinder to a better-ventilated spot within the work area and use it until it is empty
4. DKeep the valve closed except while welding and monitor the stem leak for the rest of the shift