BSI unveils revised pressure standard

20 February 2009

BSI British Standards published a revised version of its specification for pressure vessels, PD 5500:2009, specifying compliance requirements for unfired vessels in the areas of materials, design, manufacture, inspection, testing and verification.

Standard is new for 2009
Standard is new for 2009

The new specification, from the independent business services organisation, builds on PD 5500:2006 and applies to vessels manufactured from carbon, ferritic alloy and austenitic steels, aluminium, copper and nickel used in a wide range of process and energy industry applications.

It includes the corrigendum and amendments made during the last three years and is therefore technically equivalent to the 2006 edition. However, all the previous editing marks and page adjustments are now incorporated in the body text, resulting in an unmarked publication.

What's new?
 Revisions to material grouping designations in line with PD CR ISO 15608:2000
 Revisions to calculation of tubesheet ligament efficiency taking account of untubed area
 Improvements to alternative method for loads on nozzles in cylindrical and spherical shells
 Updating of references for new and revised European standards.

Enquiry cases have also been added, covering external loads on flanges, flexibility of the nozzle-vessel interface and guidance on alternative rules for nozzle reinforcement.

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.

PD 5500 provides the basis for vessel design and manufacture for Pressure Equipment Directive (PED) compliance.

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