This MGN Mainlaying - Open Cut checklist guides gas network crews and contractors through safe, compliant main installation. It covers pre-start planning, notifications, and verification of SWMS and JSA; locating, proving, and protecting underground assets with DBYD plans; trench preparation with required depths, clearances, and bedding; pipe preparation and joining methods including butt fusion and electrofusion; laying and securing pipe with correct identification and bonding; backfilling and reinstatement using approved materials and marker tape; pigging and daily pressure testing with calibrated equipment; connections including poly-to-poly procedures and Williamson tee welding; commissioning and purging in line with the commissioning plan; and final documentation of sizes, lengths, pressures, fittings, and as-laid drawings. Designed to help meet Multinet Gas requirements and keep crews and the public safe.
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