Installation of Polyethylene Encasement. 1. When noted on the Drawings or in the bid proposal, place polyethylene encasement, either in tube or sheet form, around all buried cast or ductile iron pipe joints and fittings, valves, fire hydrants, tapping saddles, sleeves, couplings, and any other appurtenance with exposed bolts. 2. Install polyethylene encasement in accordance with AWWA C105 by personnel trained in the proper application of encasement. Install polyethylene tubing in accordance with either Method A or B, and polyethylene sheets in accordance with Method C. Install tape in accordance with AWWA C105 and the Polyethylene Encasement Installation Guide published by the Ductile Iron Pipe Research Association (DIPRA). 3. Provide adequate padding of encased pipe joints and fittings when lifting with tongs, cables, or chains to prevent damage to the polyethylene material. 4. Repair any rips, punctures, or other damage to the polyethylene film with tape or with a short length of polyethylene sheet or tube cut open, wrapped around the pipe to cover the damaged area, and secured in place with tape.
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Sources: Design Standards, Standard Specifications, and Standard Details for Water and Wastewater, Design Standards, Standard Specifications, and Standard Details for Water and Wastewater