DN-17b PE Double Squeeze-Off for Gas Mains 63-355mm
by Alan Milford, from the Community
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.
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