Compressed gas cylinders (oxygen, acetylene/LPG) used for gas welding/cutting must be stored and used according to which key safety principles?

A. Cylinders may be stored lying down to save space, with no segregation needed

B. Secured upright, kept away from heat sources and each other (oxygen and fuel gas cylinders separated/segregated), fitted with correct regulators and flashback arrestors, and never used if damaged, leaking, or out of test date

C. Oxygen and acetylene cylinders can be stored together if space is limited

D. Flashback arrestors are optional accessories with no real safety function

A. Any task lasting longer than 30 minutes

B. Only welding using electric arc equipment

C. Any work involving an open flame, welding, burning, grinding, or any process that produces sufficient heat or sparks to act as a source of ignition for flammable materials, gases, or vapours

D. Only work carried out inside a cargo tank

A. A clear radius of at least 10 metres (or as defined by the risk assessment for the specific task and materials), with all combustibles removed or adequately shielded

B. No clearance is needed if a fire extinguisher is present

C. Clearance is only relevant for work carried out in an engine room

D. 1 metre is always sufficient regardless of the work type