This standard describes both materials and installation procedures for polyethylene encasement to be applied to underground installations of ductile-iron pipe. This standard also may be used for polyethylene encasement of fittings, valves, and other appurtenances to ductile-iron pipe systems.
AWWA C105/A21.5-2010由美国给水工程协会 US-AWWA 发布于 2010-06-20,并于 2010-12-01 实施。
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