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DN-16 Metallic Flow Stopping up to 12in/300mm

by Alan Milford, from the Community

Comprehensive procedure for metallic flow stopping on gas distribution mains up to 12in/300mm. Includes required tools and safety documentation, mains preparation and drilling, equipment setup and bag testing, bypass assembly and commissioning, controlled bag insertion and venting, cutting operations and hot works precautions, and full recommissioning with or without a purge rider. Concludes with bypass removal, leak testing, equipment servicing, and sign-off steps.

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This community page makes available free workplace checklists and templates created by other users within the SafetyCulture community. SafetyCulture has re-published this content and where possible, has credited the original author. SafetyCulture has not verified the accuracy, reliability or suitability of any community content. You agree that your use of any of this content is in accordance with SafetyCulture’s Terms and Conditions.

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DN-16-b Foam Plugging on LP Metallic Gas Mains

This procedure outlines DN-16-b foam plugging on low-pressure metallic gas mains from 3/80mm to 10/250mm. It covers tools and equipment, documentation checks, mains preparation, drilling and tapping, bypass assembly and commissioning, foam bag insertion, mixing and curing, pressure monitoring, cutting and removal of pipe sections, installation and testing of end caps, leak detection, equipment removal, disposal requirements, and final sign-off. The guide emphasizes safety, pressure verification, correct valve sequencing, and compliance with SGN standards for gas network operations.

by Alan Milford, from the Community

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This procedural checklist guides field operatives through live mains insertion on low-pressure gas mains up to 180mm. It details required tools and equipment, site preparation, bypass commissioning, flow stopping, purging, integrity pressure testing, insertion, and completion. It also covers service transfers, host main decommissioning, and live head recovery. Emphasis is placed on safety controls, gas isolation, pressure monitoring, leak detection, and proper reinstatement, with a final assessor sign-off.

by Alan Milford, from the Community

Get

Template

DN-17b PE Double Squeeze-Off for Gas Mains 63-355mm

This DN-17b procedure outlines step-by-step guidance for performing a PE double squeeze-off on gas distribution mains from 63 mm to 355 mm at low and medium pressure. It details prerequisites and documentation, required tools and equipment, pipe preparation and SDR checks, operational material limits, pressure monitoring setup, and construction and testing of a bypass. The workflow covers purging, venting, and commissioning of the bypass; applying sequential squeeze-offs with safety stops; verifying gas passage at vents; cutting and replacing PE main sections; electrofusion installation; and two methods to re-commission the main (via rider or controlled release). Final steps include leak testing, decommissioning of bypass and vents, re-rounding, sealing, and sign-off.

by Alan Milford, from the Community

Get

Template

Live mains insertion on low pressure mains up to 180mm

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.

by Alan Milford, from the Community

Get

DN-16 Metallic Flow Stopping up to 12in/300mm

About author

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