5.1.1 The requirements of this chapter shall apply
to products and process piping, including vapour piping, gas fuel
piping and vent lines of safety valves or similar piping. Auxiliary
piping systems not containing cargo are exempt from the general requirements
of this chapter.
5.1.2 The requirements for type C independent
tanks provided in chapter 4 may also apply to process pressure vessels.
If so required, the term "pressure vessels" as used in chapter 4,
covers both type C independent tanks and process pressure vessels.
5.1.3 Process pressure vessels include surge tanks,
heat exchangers and accumulators that store or treat liquid or vapour
cargo.