Definition - What does Spray Lining mean?
Spray lining, as it pertains to piping, is the process of applying a structural lining, either cement mortar, epoxy resin or polyureas to the inner walls of a host pipe via a rotating spray head. This technique is commonly used in trenchless construction to rehabilitate pipes in-situ without the need for excavation.
Spray lining is also known as spray-in-place pipe (SIPP) lining.
Trenchlesspedia explains Spray Lining
Similar to cured-in-place pipe (CIPP) lining, spray-in-place pipe (SIPP) lining works by rehabilitating the host pipe in-place from within the inner walls of the pipe. The rotating spray head is inserted into the host pipe and jets the epoxy resin, cement mortar or polyureas evenly on the surface area of the pipe’s inner walls.
The lining agent bonds with the pipe to seal cracks and other defects. Once hardened (cured) a structural lining is created within the pipe which helps to restore the host pipe to its original design parameters, thereby preventing future leaks and leaching of contaminants into the piping system.
SIPP lining apparatuses are often paired with cameras which allow operators to record and monitor the process to ensure accurate and uniform application of the lining agent.