Definition - What does Spray-on Lining mean?
A spray-on lining is an epoxy-based coating that is applied to the internal surface of a pipeline system. The epoxy spray-on lining is mixed and forced through the pipeline by means of compressed air, and is typically applied when a pipeline has become compromised by corrosion or other forms of degradation. A spray-on lining can prolong the service life of a pipeline.
Corrosionpedia explains Spray-on Lining
The internal surfaces of pipelines can become subject to corrosion over time and create the risk of pipeline failure. To remedy this, normally the pipeline would have to be excavated and either have a section of it replaced or have the entirety of the pipeline removed and replaced.
A spray-on lining removes the need for excavation and replacement, or at the least postpones it, because the lining provides a resilient layer to the compromised pipeline.
Several pieces of equipment are required to apply a spray-on lining. First and foremost is an industrial air compressor, which must be paired with other equipment such as heaters that can eliminate moisture from the compressed air. Attached to the compressor are several tubes that are fed into the pipeline.
To begin the process, an abrasive material is fed into the spray-on lining system and propelled through the pipeline by the air compressor. This removes loose debris from the pipeline and prepares the surface for the internal epoxy lining. Following the abrasive blasting process, epoxy components are mixed together and fed into the pipeline. The compressed air propels the epoxy in such a way that the spray-on lining is uniformly distributed throughout the pipeline. The pipeline is ready for use after the epoxy cures.