scope:

These procedures for welding as well as making hot taps on pipelines, vessels, or tanks containing flammable liquid or other materials represent a composite of petroleum industry safe practices for this type of work. They may be used as a guide and as a source of information; however, they cannot be expected to cover all contingencies which may be encountered. If a special need or a special problem exists, responsible supervision should revise these procedures, keeping in mind that safety of the operation is the first consideration.