Yingnai FRP blind flange provides removable closure for FRP pipeline ends, equipment nozzles and inspection connections. Corrosion-resistant fiberglass construction avoids metallic rust while reinforced laminates withstand sealing and bolt loads. Diameter, bolt pattern, thickness, pressure class, gasket surface and resin system can be engineered according to pipeline specifications and chemical service conditions.
| Item | Typical Technical Specification |
| Product Name | FRP Blind Flange |
| Primary Function | Removable bolted closure for a pipeline end, equipment nozzle or inspection connection |
| Typical Manufacturing Range | DN25–DN2000 as a regular range; larger sizes by engineered fabrication |
| Blind Construction | Solid laminated plate, molded blind flange or reinforced sandwich construction where required |
| Flange Face | Flat full-face gasket seating surface |
| Typical Pressure Classes | PN6, PN10 and PN16; diameter, temperature and bolt loading govern final thickness |
| Bolt Drilling | ASME B16.5, ASME B16.47, EN 1092-1, JIS B 2220 or project-specified pattern |
| Dimension Symbols | DN, outside diameter OD, pitch circle diameter PCD, bolt-hole quantity n, bolt-hole diameter d and plate thickness t |
| Resin Options | Vinyl ester, novolac vinyl ester, isophthalic polyester or process-qualified resin |
| Chemical Barrier | Process-side resin-rich corrosion barrier continuous across the complete sealing face |
| Structural Reinforcement | Balanced glass reinforcement with additional circumferential and radial reinforcement around bolt holes |
| Gasket | Full-face chemically compatible gasket; gasket hardness and compressibility selected to limit local FRP stress |
| Bolt Tightening | Cross-pattern tightening in multiple passes using washers and controlled torque |
| Optional Connections | Drain, vent, pressure gauge, flushing or instrument connection can be incorporated |
| Manufacturing Method | Contact molding, compression molding or machining from a qualified laminate plate |
| Inspection | OD, PCD, hole position, thickness, face flatness, laminate soundness, cure and pressure/leak test where specified |
| Applicable Standards | ASTM D4024, ASTM D5421, ASTM C582, ASME NM.2 and the selected drilling standard |
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