Spray-In-Place Polymeric Lining for Potable Water Pipelines 4 In. (100 mm) and Larger
|Publication Date:||24 January 2019|
This standard describes the requirements for materials, equipment, certification, and procedures for the field application of spray-in-place polymeric (SIPP) linings to the interior of existing potable water pipelines. The water pipelines to be renewed may be constructed of pipe materials such as steel, ductile iron, cast iron, asbestos cement, and concrete. Related work required for performing a complete contract is also generally described.
The standard covers all polymeric materials used in spray-in-place applications including epoxies, polyurethanes, polyureas, and hybrids of these compounds.
The in-situ spray application of polymeric linings is appropriate for pipe sections that can be lined with a computerized spray rig. The umbilical hose of the rig is inserted through the pipeline and then withdrawn progressively and uniformly using a computerized winch and spray head that applies the lining on the pipe surface to provide a continuous, smooth lining of uniform thickness.
The purpose of this standard is to provide design and consulting engineers, utility and pipeline owners, municipalities, and pipeline contractors an overview of planning, application, inspection, and structural classification requirements for renewal of water pipes utilizing SIPP lining. It should be noted that while the extent of structural enhancement achieved with SIPP lining is left to the design or consulting engineer in discussion with the product manufacturer and the constructor, the capability of polymeric SIPP linings generally meets the requirements of AWWA Classes I through III (nonstructural and semistructural). It is beyond the scope of this standard to specify design parameters to assess the physical performance of polymeric liners over their service lifecycles in potable water mains.