Leakage or weeping
Likely cause: Liner defect, poor joint preparation or local dry fiber
Evidence: Holiday/leak test, hydrotest and joint procedure
China FRP process guide
FRP filament winding
Filament winding places resin-impregnated continuous reinforcement over a rotating mandrel at controlled angles. Hoop and helical layers can be tailored for pressure, axial load and handling, while liners and corrosion barriers address the service fluid. The winding program, laminate calculation and cure record are therefore part of the product definition—not interchangeable factory know-how.
When this process fits
- Pressure and gravity pipe
- Chemical storage and process vessels
- Cylindrical tanks and ducting
- Repeatable axisymmetric parts
Process controls a buyer can audit
| Control field | Factory control | Buyer evidence |
|---|---|---|
| Design basis | Pressure, vacuum, axial loads, supports, nozzles and design factor | Approved calculation and laminate schedule |
| Corrosion barrier | Liner resin, surfacing veil, chopped layer and thickness | Service compatibility and barrier measurement |
| Winding program | Fiber angle, bandwidth, tension and layer sequence | Machine program identity and winding log |
| Cure and proof | Gel/cure cycle, post-cure and hydrostatic test | Batch cure record and witnessed test report |
Common failure modes
Premature pressure failure
Likely cause: Wrong angle, fiber content or laminate thickness
Evidence: Winding record, thickness map and qualification test
Chemical attack
Likely cause: Incorrect resin/cure or incomplete corrosion barrier
Evidence: Resin certificate, cure test and service review
RFQ inputs before supplier matching
- 01Fluid composition and temperature
- 02Operating/design pressure and vacuum
- 03Diameter, length and stiffness class
- 04Design code and test pressure
- 05Fittings, joints, supports and nozzles
- 06Inspection hold points and documentation
Missing inputs should be recorded as deviations, not silently filled with a factory default.
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Open product evidenceMatch the process, then the factory.
Send the product definition and required evidence. GetFRP will return process-fit suppliers and identify open controls.
Submit controlled RFQ