Mechanical · M-TWW7S

Hydronic Piping Trench Depth and Bedding Detail

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Buried chilled water supply and return piping requires compliance with minimum depth and bedding requirements. The assembly consists of forty millimeter CHWR and CHWS PVC carrier pipes enclosed within a five hundred millimeter PVC jacket. The trench is excavated in undisturbed earth with trench walls sloped per OSHA requirements, featuring a one hundred fifty millimeter sand or select backfill bed at the bottom. An additional one hundred fifty millimeter layer of sand or select backfill is placed over the top of the pipe jacket, followed by select backfill extending to grade. Individual trench marking tape labeled for pipe service is positioned above each pipe.

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