The application standard may requiretests in addition to those required by welding standards, for example mostUK boiler and pressure vessel codes require all weld tensile tests forplate qualification above 10mm.
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UK pressure systems regulations
Items that come under the UK pressuresystems regulations must be 'properly designed and constructed so as toprevent danger', and items that are repaired or modified should not giverise to danger. The Health and Safety Executive Guidance Booklet to theregulations interprets this statement as meaning the manufacture or repairof any item should be carried out to suitable codes and recommends theuse of British Standards or other equivalent National Standards.
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European Pressure Equipment Directive
For inspection category 2 and aboveall welding procedures and welder qualifications have to be approved bya Notified Body (an Inspection Authority Notified by a European membercountry under the Directive), or a Third Party Organisation similarly approvedunder the Directive. All qualifications approved by these organisationshave to be accepted by all parties for work carried out under the directiveproviding they are suitable for the application and technically correct.
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Welding Procedure Specifications
This is a simple instruction sheetgiving details of how the weld is to be performed, its purpose is to aidthe planning and quality control of the welding operation. EN ISO 15609 (formerly EN288 Part 2)specifies the contents of such a specification in the form of a list ofitems that should be recorded, however only relevant information need bespecified, for example only in the case of a procedure requiring heat inputcontrol would there be a necessity to quote travel speed or run out lengthfor manual processes.