Template

DN-15e Commissioning of Gas Mains by Direct Purging

by Alan Milford, from the Community

Comprehensive DN-15e procedure for commissioning gas mains up to 355 mm and 2 bar using direct purging. Includes prerequisites and permits, purge velocity rules, communications and resident liaison, branch strategies (sequential or simultaneous), rider and vent sizing and placement, risk controls, and step-by-step commissioning with P1/P2 monitoring. Covers pressure staging for MP systems, leak detection, isolation checks, and safe decommissioning and sign off.

With SafetyCulture you can

Digitize any process, procedure or policy

Eliminate mistakes made by paper-based processes

Create and share professional reports instantly

Confirm accountability and compliance with a digital log

With SafetyCulture you can

Digitize any process, procedure or policy

Eliminate mistakes made by paper-based processes

Create and share professional reports instantly

Confirm accountability and compliance with a digital log

About author

Community

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.

Template
DN-15e Gas Mains Commissioning by Direct Purging
Use this DN-15e checklist to commission new gas mains up to 355mm diameter and pressures up to 2 bar by direct purging. It covers required documentation, purge velocity guidance, communications and resident notifications, sequence for branched systems, and sizing and safety rules for riders and vents. The step-by-step procedure details preparation, pressure monitoring at P1 and P2, controlled venting, leak detection, staged pressurization for medium pressure systems, and final decommissioning and sign-off.
by Alan Milford, from the Community
Downloads: 0
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
Downloads: 0
Get
Template
DN-07c Test and Purge MP Service up to 63 mm
This DN-07c checklist guides field crews through testing and purging medium pressure gas services up to 63 mm from the main to the service regulator or ECV. It covers equipment setup, 3 bar pressure testing with no permissible loss, leak detection using approved fluid, safe depressurization from the opposite end, and immediate recording of results. Purging and commissioning steps include purge hose and flame trap setup, maintaining communication between operatives, confirming 90 percent gas in air or time-based purging rates, and checking the service excess flow valve. Use this template to standardize procedures in alignment with SGN guidelines and improve safety and compliance.
by Alan Milford, from the Community
Downloads: 0
Get
Template
DN-07c Test and Purge MP Service (<= 2 in / 63 mm)
Use this DN-07c checklist to test and purge medium pressure gas services up to 2 inches or 63 mm in line with SGN procedures. Steps include fitting test equipment, introducing air, pressure testing at 3 bar with no allowable loss, and checking joints with approved leak detection fluid. Guidance covers safe purging to atmosphere, communication between operatives, and commissioning for PE and metallic connections. The checklist also includes criteria to stop purging, verifying the service excess flow valve operation, depressurizing safely, and recording results. Finish by capping the ECV or inlet valve, labeling as required, and signing off.
by Alan Milford, from the Community
Downloads: 0
Get

DN-15e Gas Mains Commissioning by Direct Purging

Use this DN-15e checklist to commission new gas mains up to 355mm diameter and pressures up to 2 bar by direct purging. It covers required documentation, purge velocity guidance, communications and resident notifications, sequence for branched systems, and sizing and safety rules for riders and vents. The step-by-step procedure details preparation, pressure monitoring at P1 and P2, controlled venting, leak detection, staged pressurization for medium pressure systems, and final decommissioning and 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

DN-07c Test and Purge MP Service up to 63 mm

This DN-07c checklist guides field crews through testing and purging medium pressure gas services up to 63 mm from the main to the service regulator or ECV. It covers equipment setup, 3 bar pressure testing with no permissible loss, leak detection using approved fluid, safe depressurization from the opposite end, and immediate recording of results. Purging and commissioning steps include purge hose and flame trap setup, maintaining communication between operatives, confirming 90 percent gas in air or time-based purging rates, and checking the service excess flow valve. Use this template to standardize procedures in alignment with SGN guidelines and improve safety and compliance.

by Alan Milford, from the Community

Get

Template

DN-07c Test and Purge MP Service (<= 2 in / 63 mm)

Use this DN-07c checklist to test and purge medium pressure gas services up to 2 inches or 63 mm in line with SGN procedures. Steps include fitting test equipment, introducing air, pressure testing at 3 bar with no allowable loss, and checking joints with approved leak detection fluid. Guidance covers safe purging to atmosphere, communication between operatives, and commissioning for PE and metallic connections. The checklist also includes criteria to stop purging, verifying the service excess flow valve operation, depressurizing safely, and recording results. Finish by capping the ECV or inlet valve, labeling as required, and signing off.

by Alan Milford, from the Community

Get

DN-15e Commissioning of Gas Mains by Direct Purging

About author

You might also like

DN-15e Gas Mains Commissioning by Direct Purging

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

DN-07c Test and Purge MP Service up to 63 mm

DN-07c Test and Purge MP Service (<= 2 in / 63 mm)

You might also like

DN-15e Gas Mains Commissioning by Direct Purging

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

DN-07c Test and Purge MP Service up to 63 mm

DN-07c Test and Purge MP Service (<= 2 in / 63 mm)