Standards activities for the power industry sector

TWI plays a key role in the development of many standards which are important to the Power Industry. Some of the most significant are as follows.

Fitness-for-purpose

TWI has held the chairmanship of the British Standards Institution committee (WEE/37) responsible for the new fitness-for-service guide BS7910 (replacing BS PD6493) since the committee came into being in the 1970s. BS7910 is the world's most widely used document for making structural integrity assessments and TWI has had a key role in its development.

Fatigue

Most national fatigue design rules throughout the world draw heavily on TWI work. In particular, the unified rules in BS 7608, those contained in UK offshore design guides and those in the British pressure vessel code BS PD 5500.

Fracture toughness testing

The widely adopted CTOD test was developed principally by TWI who have contributed to the standardisation of the technique through the British Standards Institution, ASTM, CEN and ISO. TWI has also contributed to the standardisation of K _Ic and J testing methods.

Pressure vessels

TWI has contributed to both the British and new European pressure vessel Standards BS PD 5500 and prEN 13445 with regards to fatigue (as mentioned above), fracture toughness requirements, NDT flaw assessment and welding procedures.

Welding steels without Hydrogen cracking

BS 5135, which specifies the welding procedures required to avoid hydrogen cracking, was based almost entirely on work carried out by TWI.

Pressure Equipment Directive (PED)

TWI Certification Ltd is an independent third party organisation accredited by the Secretary of State for Trade and Industry for the approval of welding and joining procedures, welder and operator approval and non-destructive testing personnel in accordance with the essential safety requirements of the Pressure Equipment Directive.

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