Process for coating the interior surface of water service lines

摘要

Methods, processes, compositions and systems for preventing leaching effects from water pipes (such as lead, steel and copper) having an inner diameter of at least approximately 12 mm. 2-part thermoset resin coating is applied to the inner surfaces of the pipes where the curing agent can be a phenol free and plasticizer free adduct type. The coating can reduce heavy metals, such as lead, from leaching from installed pipes to less than approximately 10 μg/L (10 ppb). When cured, specific leachates, Bisphenol A and Epichlorohydrin from the coatings will be (less than)<1 μg/L (1 ppb) with overall TOC levels measured at (less than)<2.5 mg/L (2.5 ppm). Pipes can be returned to service within approximately 24 hours, and preferably within approximately 4 hours.

主权项

1. A method for providing a protective barrier coating to interior surfaces of water pipes, comprising the steps of:
providing water service pipes formed from metal having internal diameters of at least approximately 12 mm; coating interior surfaces of the water pipes with a barrier coating in a single pass; and curing the barrier coating to return the water pipes to service, wherein lead levels leaching into water from the barrier-coated water pipes is less than 10 μg/L (10 ppb), wherein the water service pipes are cured and ready to be returned to service in less than approximately 24 hours.