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

by Alan Milford, from the Community

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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.

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