Process for coating the interior surface of water service lines
US9273815B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 27, 2013 |
| Grant date | Mar 1, 2016 |
| Priority date | — |
| Expiry date | Aug 27, 2033 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05D7/222
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Methods, processes, compositions and systems for preventing leaching effects from drinking water service 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 from at least approximately 1 to approximately 2 hours.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.