Live mains insertion on low pressure mains up to 180mm
by Alan Milford, from the Community
This procedural template outlines the method for live mains insertion on low pressure gas distribution mains up to 180 millimeters. It covers required tools and equipment, site preparation, safety checks, bypass installation and commissioning, flow stopping, pressure testing, purging, and controlled insertion using approved pushing machines. The guidance explains completion steps including foaming the annulus where required, squeeze off, joint testing, reinstatement, and documentation. It also details service transfer sequencing, decommissioning of the host main, and recovery of the live head, with emphasis on maintaining supply continuity, verifying gas isolation, and following manufacturer instructions and internal work standards. Designed for field operatives and assessors, this guide supports consistent, safe utility operations.
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