Hot tapping, the term used when a branch is connected to a live or 'hot' piping system, is potentially hazardous particularly where flammable or toxic fluids are present. This publication offers guidance on how to carry out a safe and successful operation when hot tapping into metallic piping systems containing process fluids or their residues. It covers overall planning of the operation and includes hazard assessment and control, the constraints imposed by the nature, temperature and pressure of the process fluids, welding, testing and cutting (drilling/trepanning).

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