A steel-lined plastic-coated anti-corrosion and high-pressure resistant pipe fitting and its manufacturing method

Abstract

The invention discloses a steel-lined plastic-coated anti-corrosion and high-pressure resistant pipe fitting and a manufacturing method thereof, which belong to the technical field of anti-corrosion and high-pressure resistant pipe fittings. The outer steel body, the inner thermoplastic body and the reinforced plastic pipe sleeve, after sandblasting (steel shot) treatment, there are many pits and roughness on the inner wall of the outer outer steel body, and the thermoplastic body with a thickness of 4mm to 10mm is hot-compressed and applied. In the whole structural design of the pipe fittings, the inner liner thermoplastic body after heat shrinkage plays the role of bearing the hoop stress, the inner liner thermoplastic body plays the role of anti-corrosion, and the fusion of the reinforced plastic pipe sleeve and the composite pipe plays a role. Undertake the role of anti-axial stress, which greatly improves the ability of composite pipe fittings to resist acid, alkali and salt compounding, and also greatly improves the service life of the pipeline system.

Description

technical field [0001] The invention belongs to the technical field of anti-corrosion and high-pressure pipe fittings, and in particular relates to a steel-lined anti-corrosion and high-pressure pipe fitting with an outer jacket and a production method thereof. Background technique [0002] The thermoplastic continuous fiber prepreg tape reinforced thermoplastic piping system has the advantages of high pressure resistance, high heat resistance, corrosion resistance, long life, low cost, recyclability, green environmental protection, etc., and can be widely used in oilfield technical pipeline networks, long-distance oil and gas pipeline networks, Industrial and chemical pipe networks, municipal heating and water supply pipe networks, etc., have the advantages and prospects of replacing existing metal and non-metal and their composite pipe networks. [0003] In the medium and low pressure pipeline system, the pipe fittings prepared by the prior art include pure plastic pipe fi...

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Problems solved by technology

[0005] However, in many oilfield gathering and transportation pipeline networks, the delivery pressure of the pipeline system is 2.5MPa-32.0MPa; in the long-distance oil and gas pipeline network, the delivery pressure of the pipeline system is 6.4MPa; The pressure of the pipe network for solid and solid is 6.0MPa~12.0MPa. In the long-distance water diversion pipe network, the alpine reservoir water diversion pipe network, and the river diversion pipe network, the working pressure of the large diameter pipe network is as high as 4.0MPa~6.4MPa. Medium and low pressure pure plastic electrofusion pipe fittings, steel skeleton, orifice steel strip skeleton, steel wire mesh skeleton thermoplastic composite electrofusion pipe fittings cannot meet the use requirements

[0006] Steel pipe fittings can meet the pressure requirements of the 2.5MPa ~ 32.0MPa pipeline system, but because the steel pipe fittings are easy to corrode, the service life is extremely short, especially in the atmosphere of acid, alkali and saline medium

[0007] In view of the large number of 2.5MPa ~ 100MPa high-pressure pipeline systems, the existing pure plastic electrofusion pipe fittings, steel skeleton, orifice steel strip skeleton, steel wire mesh skeleton thermoplastic composite pipe fittings cannot meet the requirements for use greater than 4.0MPa, the market urgently needs to meet The 2.5MPa~100MPa high-pressure corrosion-resistant thermoplastic composite pipe fittings are matched with high-pressure continuous fiber-reinforced thermoplastic composite pipes to meet the needs of corrosion-resistant high-pressure pipeline systems

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