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Live Mains Insertion on Low-Pressure Mains up to 180mm

by Alan Milford, from the Community

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.

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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
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Template
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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Template
DN-16 Metallic Flow Stopping up to 12in/300mm
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.
by Alan Milford, from the Community
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Template
DN09 Live Service Insertion Checklist
This DN09 live service insertion checklist guides gas utility technicians through safe, compliant insertion of PE pipe into an existing service. It covers site tracing, barhole leakage surveys, excavations, electrical cross bonding, valve and gland assembly setup, pressure verification, rod and elbow testing, pipe cleaning, integrity and soundness tests, purging, sealing, and final reconnection to the property. It aligns with current SGN procedures and emphasizes safety checks, pressure monitoring, and waste disposal requirements.
by Alan Milford, from the Community
Downloads: 0
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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

Template

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

Get

Template

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

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.

by Alan Milford, from the Community

Get

Template

DN09 Live Service Insertion Checklist

This DN09 live service insertion checklist guides gas utility technicians through safe, compliant insertion of PE pipe into an existing service. It covers site tracing, barhole leakage surveys, excavations, electrical cross bonding, valve and gland assembly setup, pressure verification, rod and elbow testing, pipe cleaning, integrity and soundness tests, purging, sealing, and final reconnection to the property. It aligns with current SGN procedures and emphasizes safety checks, pressure monitoring, and waste disposal requirements.

by Alan Milford, from the Community

Get

Live Mains Insertion on Low-Pressure Mains up to 180mm

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