Publication: National Structural Steelwork Specification for Building Construction

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Publication Update for steelwork specification National Structural Steelwork Specification for Building Construction – 5th Edition was published last month. Dr David Moore, BCSA Director of Engineering explains the significant changes. On 1st January 2007 the BCSA published the required to operate their welding quality systems in Above: The cover of the 5th edition of the National Structural Steelwork line with these standards. new edition of the NSSS. Specification for Building Construction (NSSS). “Those steelwork contractors with quality The revision of the NSSS was prompted by the systems certified to BS EN ISO 9001 should developing of a forthcoming European standard expect to have the scope of certification endorsed “It was decided not and erection due course,” says Dr Moore. This will align withby a specific reference to BS EN ISO 3834-3 infor the fabrication to completely adopt of structural forthcoming requirements in BS EN 1090-1 and -2. the philosphy of BS EN 1090-2, post-galvanizing inspection to avoid liquid metalA new section has been added giving options forsteelwork, BS ES 1090-2 but which is expected assisted cracking. This is based on guidance given to be introduced at in the joint BCSA and Galvanizers Association to create a kind the start of 2008. publication ‘Galvanizing Structural Steelwork - An of halfway house “At the start it Approach to the Management of Liquid Metal was decided not to Assisted Cracking’. between version 4 of completely adopt A new Annex D has been added which gives the NSSS and the new the philosophy practical advice on how to carry out the visual of BS EN 1090-2 inspection of welds. The recommendation given in European standard.” but to create a this Annex are based on the key procedures given kind of halfway in BS EN 970. These include visual inspection prior house between version 4 of the NSSS and the new to welding or between weld passes, and visual European standard,” explains Dr David Moore, inspection after deposition of each weld pass or at BCSA Director of Engineering. final completion. The updated specification contains a number Meanwhile, the hold times in Annex A have of changes that will be of interest to specifiers and been revised. These are now based on heat input steelwork contractors. and weld size rather than material grade. They are The reference standards for steel sections, based on the recommendations given in Annex C of structural bolts and welding have been updated to BS EN 1011 Part 2. reflect the changes that have occurred since the “The test requirements for stud welding have publication of the 4th edition of the NSSS. The been clarified,” adds Dr Moore. They have been erection tolerances for foundation supports have developed from issues identified in the BCSA ‘Code now been aligned with the National Structural of Practice for Metal Decking and Stud Welding’. Concrete Specification. The revised recommendations include trial welds, The preferred generic treatment specifications tests and non-conformity procedures. originally developed by CIRIA have been moved from the Commentary into the NSSS. Meanwhile, the welding quality standard Copies of the 5th edition of the National Structural Steelwork BS EN ISO 3834-3 (replacing BS EN 729-3) and Specification for Building Construction may be purchased from BCSA or by reference the welding coordination standard SCI at £25.00 to non-members and £18.75 to members per copy. A further BS EN ISO 14731 (replacing BS EN 719) are now 10% discount is given to BCSA Members on orders of 20 or more. part of the NSSS. Steelwork contractors are 24 NSC February 2007


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