The Lining Process
Pipe system diagnosis and set-up
The existing pipe system is inspected for integrity and spot repairs on excessively worn joints and fittings are made where necessary. Valves are removed and their locations temporarily fitted with unions and/or couplings which remain through the restoration sequence. Sitting water is drained from the pipe system and air is introduced into the system to test for leaks. Temporary bypass water piping provisions are installed as necessary.
The pipe runs being restored are dried with heated compressed air to remove all moisture. The air medium is then used to distribute an abrading agent throughout the pipe to remove all rust and corrosion products. The removed corrosion material is subsequently gathered into a collection unit. Air is again surged through the pipe to remove any residual debris and dust fines.
The cleaned pipe system is re-heated to create an optimal internal pipe surface environment prior to epoxy coating. An air pressure leak test is again performed prior to coating. Conditioned air is then introduced into the pipe to uniformly distribute the epoxy lining throughout the pipe segment. Following the coating application, continuous controlled air is sent through the piping to facilitate epoxy curing.
System re-assembly and evaluation
After the lining is cured, all removed valves and fittings are returned to their original locations. A final leak test and inspection is performed. Water quality, volume and flow are tested.