Methods and systems for cleaning, coating and sealing leaks in existing nonmetal pipes, in a single operation. A nonmetal piping system can be cleaned in one pass by dry particulates forced and pulled by air throughout the piping system by a generator and a vacuum. Nonmetal pipes with nonmetal fittings or nonmetal pipes with metal fittings or nonmetal pipes with a combination of metal and nonmetal fittings can be protected from wear by water erosion and rupturing, extending the life of pipes made of a nonmetal material selected from at least one of plastics, PVC (polyvinyl chloride), composite materials, or polybutylene. Coatings can be applied to nonmetal pipes having diameters up to approximately 6. Leak sealants of at least approximately 4 mils thick can cover insides of nonmetal pipes, and can include novel mixtures of fillers and epoxy materials, and viscosity levels. A positive pressure can be maintained within the nonmetal pipes during applications. Piping systems can be returned to service within approximately 96 hours.

A moisture treatment and leak sealant product for a vapor-compression system has two separate components. One of the components includes a viscosity modifying additive, excluding oil compounds, to more closely match a viscosity of the product to that of lubricating oil in the system and a drying agent to remove moisture from the system. The second of the components includes a silane leak sealant and also the viscosity modifying additive.

A moisture treatment and leak sealant product for a vapor-compression system has two separate components. One of the components includes a viscosity modifying additive, excluding oil compounds, to more closely match a viscosity of the product to that of lubricating oil in the system and a drying agent to remove moisture from the system. The second of the components includes a silane leak sealant and also the viscosity modifying additive.

Methods and systems for cleaning, coating and sealing leaks in existing nonmetal pipes, in a single operation. A nonmetal piping system can be cleaned in one pass by dry particulates forced and pulled by air throughout the piping system by a generator and a vacuum. Nonmetal pipes with nonmetal fittings or nonmetal pipes with metal fittings or nonmetal pipes with a combination of metal and nonmetal fittings can be protected from wear by water erosion and rupturing, extending the life of pipes made of a nonmetal material selected from at least one of plastics, PVC (polyvinyl chloride), composite materials, or polybutylene. Coatings can be applied to nonmetal pipes having diameters up to approximately 6. Leak sealants of at least approximately 4 mils thick can cover insides of nonmetal pipes, and can include novel mixtures of fillers and epoxy materials, and viscosity levels. A positive pressure can be maintained within the nonmetal pipes during applications. Piping systems can be returned to service within approximately 96 hours.

Methods and systems for cleaning, coating and sealing leaks in existing nonmetal pipes, in a single operation. A nonmetal piping system can be cleaned in one pass by dry particulates forced and pulled by air throughout the piping system by a generator and a vacuum. Nonmetal pipes with nonmetal fittings or nonmetal pipes with metal fittings or nonmetal pipes with a combination of metal and nonmetal fittings can be protected from wear by water erosion and rupturing, extending the life of pipes made of a nonmetal material selected from at least one of plastics, PVC (polyvinyl chloride), composite materials, or polybutylene. Coatings can be applied to nonmetal pipes having diameters up to approximately 6. Leak sealants of at least approximately 4 mils thick can cover insides of nonmetal pipes, and can include novel mixtures of fillers and epoxy materials, and viscosity levels. A positive pressure can be maintained within the nonmetal pipes during applications. Piping systems can be returned to service within approximately 96 hours.

Using general purpose raw materials, a polyurethane foam having higher water stopping properties than conventional ones is provided. The polyurethane foam is a polyurethane foam obtained by foaming and curing a composition containing a polyol component, an isocyanate component, a foam stabilizer, a cross-linking agent, and a catalyst.

Using general purpose raw materials, a polyurethane foam having higher water stopping properties than conventional ones is provided. The polyurethane foam is a polyurethane foam obtained by foaming and curing a composition containing a polyol component, an isocyanate component, a foam stabilizer, a cross-linking agent, and a catalyst.

In an example, a method of repairing a pipeline includes isolating a section of a pipeline that includes a leak site. The method includes flooding the section of the pipeline with a plug formulation that includes artificial platelets and an ultraviolet (UV) photoinitiator. The section may be pressurized to induce migration of the artificial platelets to the leak site. The method also includes draining excess plug formulation from the section of the pipeline. The method further includes exposing the UV photoinitiator to UV light to form a gas impermeable seal at the leak site.

In an example, a method of repairing a pipeline includes isolating a section of a pipeline that includes a leak site. The method includes flooding the section of the pipeline with a plug formulation that includes artificial platelets and an ultraviolet (UV) photoinitiator. The section may be pressurized to induce migration of the artificial platelets to the leak site. The method also includes draining excess plug formulation from the section of the pipeline. The method further includes exposing the UV photoinitiator to UV light to form a gas impermeable seal at the leak site.

Pellet compositions for sealing a leak include (a) a fibrillated fibrous material, (b) a particulate material, and (c) a compound that by itself and/or in combination with at least one additional compound is configured to generate effervescence. Systems for sealing a leak include (a) a pellet composition, and (b) a first fluid configured for combination with the pellet composition, wherein the first fluid includes water. Methods for sealing a leak in a heat exchange system are described.