In order to make fiberglass flanges, pipe overall shape, There are two technical approaches. ① take pipe diameter tapered bore small end diameter, will be pre-processed under good piping material, playing both ends of the hair, instead of the mandrel interposed mold seat, and then processed flanges, stripping it obtained cured FRP flanged FRP pipes for plastic composite pipes using this method is more appropriate, as long as the surface of the plastic tube processing technology instead of the mandrel interposed in the mold, then machining the flange and composite fiberglass layer, then cured to obtain a release with flange overall composite structure pipe. ② first FRP flange processing is good, its tapered neck, flange ring as described above, except that only the processing of the barrel portion into a stepped stepped, step length is greater than 30mm, the step thickness is 0.4-1.0mm, each level equal to the thickness of the tube wall thickness and, to be cured after releasing into the pipe flange forming mandrel mold ends handling paste, winding glass pipe, they will have with the overall glass pipe flange.