A plastic lining method used for a seal face of a plastic-lined composite steel pipe flange

Abstract

The invention discloses a plastic lining method used for plastic lining of a seal face of a plastic-lined composite steel pipe flange, belongs to the technical field of designing and manufacturing of plastic lining composite steel, and particularly provides a plastic lining method which is capable of connecting a plastic cover layer on the seal face of a connecting flange and a plastic lining layer in a plastic-lined composite steel pipe into a whole part and capable of achieving reliable adhesion of the plastic lining layer in the plastic-lined composite steel pipe and the inner wall of the steel pipe for plastic lining of the seal face of the plastic-lined composite steel pipe flange. According to the plastic lining method, melt high-temperature plastic is injected onto the seal face of the connecting flange and the insides of ends of the plastic-lined composite steel pipe by utilization of a heating device and an injection mould, and is connected to an original inner plastic lining layer to form a whole part, and the seal face of the connecting flange and the insides of the ends of the plastic-lined composite steel pipe are firmly covered with the melt high-temperature plastic.

Description

technical field [0001] The invention relates to a plastic-lined method, in particular to a plastic-lined method for the flange sealing end face of a plastic-lined composite steel pipe, and belongs to the technical field of design and manufacture of a plastic-lined composite steel pipe. Background technique [0002] In the prior art, the production technologies for plastic-coating the flange surface of the plastic-lined composite steel pipe mainly include "direct flanging and plastic coating on the flange surface", "sticking a plastic ring on the flange surface" and "installing a plastic bushing on the flange surface". The basic method of directly flanging and covering the flange surface is: insert the processed plastic lining pipe into the steel pipe with flanges welded at both ends, and then heat and flanging the end of the lining plastic pipe to make it cover to the flange sealing surface. Since the inner plastic layer of the plastic-lined composite steel pipe is not bond...

AI Technical Summary

Problems solved by technology

The plastic-coated layer on the flange surface and the inner plastic layer of the plastic-lined composite steel pipe produced by this method still cannot be connected as a whole, and the medium transported in the pipeline is easy to corrode through the gap between the plastic bushing and the plastic-lined composite steel pipe base pipe. Pipe and flange sealing surface

[0003] In the prior art, there is no one that can not only connect the plastic-coated layer of the flange sealing surface with the inner plastic layer of the plastic-lined composite steel pipe, but also make the inner plastic layer of the plastic-lined composite steel pipe and the inner wall of the steel pipe realize a reliable connection. Production method of bonded plastic-lined composite steel pipe

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