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...

Examples

Embodiment 1

[0031] Such as figure 1 As shown, it includes the outer steel body 1, the inner thermoplastic body 2 and the reinforced plastic sleeve 3. In the structural design of the entire pipe fitting, the outer steel body 1 plays the role of bearing the hoop stress, and the inner thermoplastic body 2 plays the role of bearing Anti-corrosion effect, the reinforced plastic sleeve 3 plays the role of anti-axial stress.

[0032] Wherein the outer casing steel body 1 includes the receiving section 11 located at both ends and the transfer section 12 located in the middle, the connection between the two ends of the transfer section 12 and the corresponding receiving section 11 is formed as a whole by external electric welding, and the port of the receiving section 11 There are several equidistant bolt holes in the circumferential direction, and the transition section 12 can be an elbow, a tee, a direct connection, a flange, etc., and the lining thermoplastic body 2 includes a liner thermoplast...

Embodiment 2

[0034] The invention also discloses a method for manufacturing a steel-lined plastic-coated anti-corrosion and high-pressure resistant pipe fitting, which includes the following steps:

[0035] A1. Select the receiving section 11 whose inner diameter is 8mm to 20mm larger than the outer diameter of the external composite pipe, and the wall thickness of the receiving section 11 should be 8mm larger than the diameter of the tie bolt;

[0036] A2. Select the transfer section 12 whose nominal diameter is equal to the inner diameter of the external composite pipe, weld and fix the root of the finished product of the receiving section 11 and the port of the transfer section 12 to form the outer steel body 1;

[0037] A3. Heat the jacket steel body 1 to 250°C-400°C as a whole, keep the jacket steel body at 200°C-250°C with built-in thermoplastic powder coating plastic melt, and after natural cooling and shaping to obtain the lining thermoplastic body 2, remove The remaining thermopla...

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...

Examples

Embodiment 1

[0031] Such as figure 1 As shown, it includes the outer steel body 1, the inner thermoplastic body 2 and the reinforced plastic sleeve 3. In the structural design of the entire pipe fitting, the outer steel body 1 plays the role of bearing the hoop stress, and the inner thermoplastic body 2 plays the role of bearing Anti-corrosion effect, the reinforced plastic sleeve 3 plays the role of anti-axial stress.

[0032] Wherein the outer casing steel body 1 includes the receiving section 11 located at both ends and the transfer section 12 located in the middle, the connection between the two ends of the transfer section 12 and the corresponding receiving section 11 is formed as a whole by external electric welding, and the port of the receiving section 11 There are several equidistant bolt holes in the circumferential direction, and the transition section 12 can be an elbow, a tee, a direct connection, a flange, etc., and the lining thermoplastic body 2 includes a liner thermoplast...

Embodiment 2

[0034] The invention also discloses a method for manufacturing a steel-lined plastic-coated anti-corrosion and high-pressure resistant pipe fitting, which includes the following steps:

[0035] A1. Select the receiving section 11 whose inner diameter is 8mm to 20mm larger than the outer diameter of the external composite pipe, and the wall thickness of the receiving section 11 should be 8mm larger than the diameter of the tie bolt;

[0036] A2. Select the transfer section 12 whose nominal diameter is equal to the inner diameter of the external composite pipe, weld and fix the root of the finished product of the receiving section 11 and the port of the transfer section 12 to form the outer steel body 1;

[0037] A3. Heat the jacket steel body 1 to 250°C-400°C as a whole, keep the jacket steel body at 200°C-250°C with built-in thermoplastic powder coating plastic melt, and after natural cooling and shaping to obtain the lining thermoplastic body 2, remove The remaining thermopla...

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