Alert: Export Control Check Required
Thank you for requesting a TWI Industrial Members Report.
To meet UK government requirements, your request will undergo an Export Control Check. This process reviews the technical content of the report, identifies the end user, and addresses any concerns.
Please submit your request to CRP@twi.co.uk including your name, member company that you work for and your location. We will contact you regarding the request within 2 working days and any additional information required to complete the necessary checks.
We look forward to receiving your request and processing it through our export control procedure.
Thank you,
TWI CRP Operations Team
This content is only available to Industrial Members, Find out how to become a Member of TWI.
TWI Industrial Member Report Summary 599/1997
K Bell
On completion of manufacture, pressure vessels fabricated to codes must undergo a pressure test to demonstrate as far as possible, their structural integrity. For example, for BS 5500 the stress level during the hydrostatic pressure test must be at least 1.25 times the design stress of the vessel. For vessels designed to operate at below ambient temperatures the hydrostatic test is also a warm prestress or preload event, which has been shown to produce benefits in terms of the vessel's subsequent resistance to brittle fracture.