Internal and external plastic-coated composite pipe for water supply, fire mains and corrosive media.
Plastic-coated composite pipe combines the mechanical strength of a steel pipe with the corrosion resistance of a polymer coating. The steel carries the internal pressure and the external loads; the coating isolates the steel from water, soil and dissolved chemicals — so you get a service life far longer than bare or galvanised pipe at a lower cost than stainless.
The coating quality is decided by surface preparation. We shot-blast the pipe to Sa 2.5, heat it, then apply epoxy by electrostatic spray or polyethylene by fluidised-bed dipping, followed by curing and full-surface holiday detection.
Internal epoxy is the usual choice for potable water because it is smooth, non-toxic after curing and does not affect taste. External polyethylene is preferred for buried service because of its impact and soil-stress resistance. A combined internal-epoxy / external-PE build-up is available for buried potable water lines.
Connections can be grooved, flanged, threaded or welded with on-site coating repair. Tell us your medium, temperature and connection method and we will specify the build-up.
| Coating Material | Epoxy (EP) / Polyethylene (PE) |
| Coating Position | Internal + external, or external only |
| Coating Thickness | 0.25 – 0.50 mm |
| Nominal Diameter | DN25 – DN1200 (special up to DN3800) |
| Base Pipe | ERW / seamless / SSAW / galvanised |
| Adhesion | Per CJ/T 120 cross-cut / peel test |
| Operating Temperature | -30 °C to +80 °C |
| Connection | Grooved, flanged, threaded or welded |
| Standard | CJ/T 120, GB/T 28897, GB/T 17219 |
| Certificate | MTC EN 10204 3.1 + coating test report |
Every pipe passes through the same controlled route, with inspection points at each stage.
Check straightness, ovality and weld bead height before coating.
Sa 2.5 blast with anchor profile, then induction heating.
EP by electrostatic spray or PE by fluidised-bed dipping.
Controlled curing to achieve full cross-linking and adhesion.
100% holiday detection on the coated surface, repairs as required.
Ends chamfered, protective caps fitted, pipes stencilled.
Double-sided submerged arc spiral welded pipe for water, structure and piling.
FBE / 2FBE / 3PE / TPEP systems for buried gas, water and sewage lines.
Direct-buried polyurethane pre-insulated pipe for district heating networks.
Steel-jacket steam insulation for high-temperature steam transmission.
