This Published Document specifies requirements for the design, construction, inspection, testing and
verification of compliance of new unfired fusion welded pressure vessels. The materials of construction are
specified in Section 2. The term “pressure vessel” as used in this specification includes branches up to the
point of connection to the connecting piping by bolting, screwing or welding, and supports, brackets or other
attachments directly welded to the pressure containing shell. The term “unfired” excludes vessels that are
subject to direct generated heat or flame impingement from a fired process. It does not exclude vessels
subject to electrical heating or heated process streams.
BS PD 5500:2009 history
2021BS PD 5500:2021 Specification for unfired pressure vessels