Inner and outer surface coating for the valves, fittings and pipes used in water, wastewater, oil and seawater lines — wet enamel, powder enamel and epoxy powder coating lines, from pretreatment to firing and curing.
Throughout their service life, valve bodies, fittings and pipes are in contact with water, soil, seawater or chemicals; the coating is the barrier between the metal and its environment. Depending on the service conditions there are two main routes: enamel, an inorganic glass layer fused to the metal, or epoxy powder coating, an organic thermoset film.
STRONG3000 designs and builds the line for either route: washing and pretreatment, application booths, drying, enamel firing or powder curing ovens, conveyors and automation.
The choice of coating depends on the part’s material, geometry and service conditions. Below are the main parts in the valve and pipe group and the processes used; for other parts, too, the line is configured to the part.
On gate and butterfly valve bodies, bonnets and hydrants the inner flow surface and the outer surface are coated together. For enamel the parts pass through a conveyorised line-type booth; for epoxy powder coating the part is heated and the powder applied.
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Elbows, tees and flanged fittings need complete coverage, including inner corners and flange faces. Epoxy powder coating is used for series parts; for heavily corrosive environments there is an enamel option too.
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In buried water lines the pipe works against moisture in the soil on the outside and the water it carries on the inside; the inner and outer surfaces are enamelled on the same line.
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In pipes carrying crude oil and produced water, the inner surface is enamelled against corrosion and sand-induced wear.
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Cooling lines in a ship’s engine room run directly on seawater; enamel seals the metal surface against salt water.
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Epoxy powder coating for the outer surface and the inner lining: the pipe is heated, the powder is applied electrostatically and melts on the hot surface.
Request Details & a QuoteA glass layer fused to the metal on the inner and outer surfaces of valves and pipes; conveyorised line-type booth, drying and firing.
Electrostatic powder enamel on the inner and outer surfaces of pipes; the pipes travel hanging vertically on the conveyor and gun robots do the application.
Pretreatment, preheating, powder application and curing in one line for valves, fittings and pipes.
Degreasing and surface preparation before coating, for steel and cast iron parts.
Removes the water from wet enamel before firing, and moisture after washing before coating.
Repeatable production with overhead conveyors, robotic application and line control.
A valve manufacturer may need epoxy powder coating for drinking water fittings and enamel for wastewater and seawater lines in the same plant. STRONG3000 designs wet enamel, powder enamel and epoxy powder coating lines from a single source; pretreatment, ovens, conveyors and controls are planned by the same engineering team.
Selected projects from STRONG3000 plants in operation.
Automatic line-type wet enamel plant for the inside and outside of valves and pipes. Filtered, stackless application booths.
Sintering (enamel) furnace, washing and drying line for enameling plants.
Tell us about your part, its service conditions and your capacity, and we will plan the right wet enamel, powder enamel or epoxy powder coating line together.
Tell us about your pipe or profile part and volume. A STRONG3000 engineer will get back to you with a recommended process.