# US 2018/0021808 A1 · Process for Coating the Interior Surface of Non-Metallic Pipes with Metal Valves and Metal Fittings > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0021808 A1 - Document ID: US20180021808A1 - Status: Published application - Kind: A1 - Application number: 15/694,442 - Filed: 2017-09-01 - Published: 2018-01-25 - Earliest claimed: 2002-08-28 - Assignees: Pipe Restoration Technologies, LLC - Applicants: Pipe Restoration Technologies, LLC - Inventors: Larry L. Gillanders; Steven A. Williams - Web page: https://patentgrep.com/patent/US20180021808A1 ## CPC - B05D 7/222: {of pipes} - B05D 3/002: {Pretreatement} - B05D 3/04: by exposure to gases - B05D 3/0406: {the gas being air} - B05D 3/0473: {for heating, e.g. vapour heating} - B05D 3/12: by mechanical means - F16L 57/00: Protection of pipes or objects of similar shape against external or internal damage or wear ({protection under water F16L1/123;} supporting of pipes inside other pipes or sleeves F16L7/00; used in connection with end fittings of hoses F16L35/00; protection of pipes or pipe fittings against corrosion or incrustation F16L58/00; protection thereof during transport B65D59/00) - F16L 58/02: by means of internal or external coatings - F16L 58/1009: {the coating being placed inside the pipe} - B05D 2504/00: Epoxy polymers - F16L 58/10: by rubber or plastics - B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02) - F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL ## Abstract 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. ## Claims ### Claim 1 A method for providing a protective barrier coating to interior surfaces of non-metallic water service pipes with at least one metal fitting exposed to drinking water passing through the non-metallic water service pipes, comprising the steps of: providing non-metallic water service pipes having internal diameters from at least approximately 12 mm; providing the non-metallic water service pipes having at least one metal fitting where the at least one metal fitting is exposed to drinking water passing through the water service pipes; coating interior surfaces of the non-metallic water service pipes and the at least one metal fitting exposed to drinking water with a leak sealant barrier coating; curing the barrier coating to return the non-metallic water service pipes to service; and reducing lead levels leaching into the drinking water from the at least one metal fitting in the non-metallic water service pipes to less than 10 μg/L (10 ppb). ### Claim 2 (depends on 1) The method of claim 1, wherein the non-metallic water service pipes are made of materials selected from one of CPVC (chlorinated polyvinyl chloride), PVC (polyvinyl chloride), PEX (cross-linked polyethylene), PB (polybutylene), ABS (acrylonitrile butadiene styrene, HDPE (high-density polyethylene) or concrete. ### Claim 3 (depends on 1) The method of claim 1, wherein the at least one metal fitting is made of materials selected from at least one of lead, galvanized steel, black steel, stainless steel, steel alloys, brass, or copper. ### Claim 4 (depends on 1) The method of claim 1, wherein the coating step includes the step of: coating the interior surfaces of the non-metallic water service pipes and the inside surfaces of the at least one metal fitting “in place” without having to dismantle the water service pipes from the at least one metal fitting. ### Claim 5 (depends on 1) The method of claim 1, wherein the step of reducing further includes the steps of: reducing leachates, Bisphenol A and epichlorohydrin from the leak sealant barrier coating to be less than approximately 1 μg/L (1 ppb). ### Claim 6 (depends on 1) The method of claim 1, wherein the step of reducing further includes the step of: reducing overall TOC (total organic compounds) levels leaching from the coating measured to be less than approximately 2.5 mg/L (2.5 ppm). ### Claim 7 (depends on 1) The method of claim 1, wherein the curing step includes the step of: adding phenol free and plasticizer free amine adducts to the base resin to reduce Bisphenol A and epichlorohydrin. ### Claim 8 (depends on 1) The method of claim 1, further comprising the steps of: providing a 2-part thermoset coating composition as the leak sealant barrier coating, and providing a base resin and a base-curing agent that includes a phenol free and plasticizer free amine adduct. ### Claim 9 (depends on 8) The method of claim 8, further comprising the steps of: providing approximately 40% to approximately 80% epoxy resin as the base resin, and providing approximately 20% to approximately 45% polyamine adduct as the curing agent. ### Claim 10 A method for reducing the effects of corrosion including leaching of metals from inside surfaces of non-metallic water service pipes with at least one metal fitting that are exposed to drinking water passing through the non-metallic water pipes, comprising the steps of: providing non-metallic water pipes with at least one metal fitting for supplying drinking water; cleaning interior surfaces of the drinking water pipes with the at least one metal fitting; coating the interior surfaces of the non-metallic pipes and the at least one metal fitting with a barrier leak sealant, wherein the interior surfaces of the pipes and the at least one metal fittings, are lined and sealed “in place” (in-situ) while minimizing need for opening up walls, floors, ceilings, or grounds; and curing the coated water pipes. ### Claim 11 (depends on 10) The method of claim 10, wherein the non-metallic water service pipes are made of materials selected from one of CPVC (chlorinated polyvinyl chloride), PVC (polyvinyl chloride), PEX (cross-linked polyethylene), PB (polybutylene), ABS (acrylonitrile butadiene styrene, HDPE (high-density polyethylene) or concrete. ### Claim 12 (depends on 10) The method of claim 10, wherein the valves and the at least one metal fitting are made of materials selected from at least one of lead, galvanized steel, stainless steel, steel alloys, black steel, brass, or copper. ### Claim 13 (depends on 10) The method of claim 10, wherein the coating step includes the step of: coating the interior surfaces of the non-metallic water service pipes and inside surfaces of the at least one metal fitting “in place” without having to dismantle the water service pipes from the at least one metal fitting. ### Claim 14 (depends on 10) The method of claim 10, wherein the step of reducing further includes the steps of: reducing leachates, Bisphenol A and epichlorohydrin from the leak sealant barrier coating to a level less than approximately 1 μg/L (1 ppb). ### Claim 15 (depends on 14) The method of claim 14, wherein the step of reducing further includes the step of: reducing overall TOC (total organic compounds) levels leaching from the coating measured to be less than approximately 2.5 mg/L (2.5 ppm). ### Claim 16 (depends on 10) The method of claim 10, further comprising the step of: providing the barrier coating include a two-part thermoset resin coating having hydrophobic qualities that permit the coating to be cured in-place by using at least one of an air curing period, a water curing period or a steam curing period or a combination thereof, without need for a membrane barrier between the water or steam and lining material coating. ### Claim 17 (depends on 10) The method of claim 10, wherein the curing step includes the step of: adding phenol free and plasticizer free amine adducts to the base resin to reduce Bisphenol A and epichlorohydrin. ### Claim 18 (depends on 10) The method of claim 10, further comprising the steps of: providing a 2-part thermoset coating composition as the leak sealant barrier coating, and providing a base resin and a base-curing agent that includes a phenol free and plasticizer free amine adduct. ### Claim 19 (depends on 18) The method of claim 18, further comprising the steps of: providing approximately 40% to approximately 80% epoxy resin as the base resin, and providing approximately 20% to approximately 45% polyamine adduct as the curing agent. ### Claim 20 A method for reducing the effects of corrosion including leaching of metals from inside surfaces of non-metallic water service pipes with at least one metal fitting that are exposed to drinking water passing through the non-metallic water pipes, comprising the steps of: providing non-metallic water pipes with at least one metal fitting for supplying drinking water; cleaning interior surfaces of the drinking water service pipes and the at least one metal fitting; coating the interior surfaces of the non-metallic pipes and the at least one metal fitting with a barrier leak sealant, wherein the interior surfaces of the pipes and the at least one metal fitting are lined and sealed “in place” (in-situ) while minimizing need for opening up walls, floors, ceilings, or grounds; and reducing overall TOC (total organic compounds) levels leaching from the coating measured to be less than approximately 2.5 mg/L (2.5 ppm).