TG 20 13 update September 2014 Introduction The

TG 20: 13 update September 2014

Introduction • The NASC is continuing to improve TG 20: 13, the comprehensive guide to good practice for tube and fitting scaffolding • The first update to TG 20, TG 20: 13 Supplement 1, launched in September 2014 • It is accompanied by an update to the TG 20: 13 e. Guide, version 1. 1, now available for download from the NASC website

What’s new? • A specification for TG 20: 13 compliant cold-formed high tensile steel tubes in TG 20: 13 Supplement 1 • TG 20 compliance sheets for coldformed high tensile steel tubes in the new TG 20 e. Guide • TG 20 compliance sheets for sheeted scaffolds with transom units • Several minor enhancements to TG 20 compliance sheets

High tensile tubes • TG 20: 13 provides a definition for TG 20 compliant 3. 2 mm wall thickness hightensile steel tubes to BS EN 10210 -1 • These tubes are manufactured by a hotrolling process and offer performance comparable to type 4 steel tubes • However, many 3. 2 mm high-tensile tubes used in the UK scaffolding industry are manufactured with a cold-formed process • Although these tubes have a higher bending capacity than type 4 steel tubes, they did not comply with TG 20: 13 because they have a lower axial load capacity due to their reduced thickness

High tensile tubes • TG 20: 13 has now been extended to support these tubes • The required tube specification is defined in TG 20: 13 Supplement 1 • New TG 20 compliance sheets are available for tubes of this specification from the new TG 20 e. Guide

High tensile tubes • TG 20 compliance sheets for cold-formed high-tensile steel tubes are printed from the new version of the TG 20: 13 e. Guide with this new option:

Transom units • TG 20 compliance sheets are now available for sheeted scaffolds constructed with TG 20 compliant prefabricated structural transom units • Compliance sheets are available for tied independent scaffolds and tied towers • Printed from the new TG 20 e. Guide • Guidance is provided in TG 20: 13 Supplement 1

Compliance sheet enhancements • Some minor enhancements have been made to the TG 20 compliance sheets from the new e. Guide based on feedback • A new note that ‘illustrations are indicative’ – the compliance sheet illustrations are not dimensioned design drawings • Specific compliance sheets for scaffolds which are 2. 0 m, 3. 0 m or 4. 0 m tall • Minor clarifications to the wording for scaffolds tied to the inner face only

Compatibility • The NASC recommends that the latest TG 20 compliance sheets from the new e. Guide are always used • However, this update to TG 20 has been designed such that compliance sheets from the original e. Guide (and from the TG 20: 13 Operational Guide) are still valid • There is no need to differentiate between new and original compliance sheets on site

Software download • Version 1. 1 of the TG 20: 13 e. Guide is available as a free software update • Available for Windows, Mac and Android devices • Download from the NASC website • TG 20: 13 Supplement 1 is available for download as a PDF http: //www. nasc. org. uk/tg 20_13_supplement_1_and_eguide_update

Thank you Questions?