This standard describes the requirements for the materials and application of an
epoxy lining to the inside surface of previously installed water pipelines 3 in. (75 mm)
in diameter and larger. The water pipelines to be rehabilitated may be constructed of
any of the following materials: steel,...
Back to AWWA C620-07 Spray-in-Place Epoxy Lining of Water Pipelines, 3 In. (75 mm) and Larger (PDF)
This standard describes the requirements for the materials and application of an
epoxy lining to the inside surface of previously installed water pipelines 3 in. (75 mm)
in diameter and larger. The water pipelines to be rehabilitated may be constructed of
any of the following materials: steel, ductile iron, cast iron, asbestos cement, and
concrete. Related work required for performing a complete contract is also generally
described.
The application is appropriate for the following pipe:
straight pipe sections can be lined with a machine that progresses
uniformly through the pipe and applies an epoxy to the pipe surfaces centrifugally to
obtain a smooth lining of uniform thickness with smooth transitions over joints;
long radius bends may be lined similarly, however most bends are the
short radius type, the lining of short radius bends and fittings that cannot be readily
negotiated shall be hand coated, this may require additional access points;
pipe must be structurally suitable, epoxy lining is not designed to replace
the host pipe, structurally weakened pipes whether by pitting, graphitization, or
other weakness may not be candidates for epoxy lining, structural soundness of the
pipe may need to be analyzed for its intended use.