Manufacturing method of steel rotational moulding pipeline with modified polypropylene inner liner

A manufacturing method and polypropylene technology, applied in rigid pipes, coatings, pipes, etc., can solve the problems of low melt index, uneven flanging, inability to withstand negative pressure, etc., and achieve good compactness, no joints, and strong integrity. Effect

Active Publication Date: 2014-08-13
江苏兆辉防腐科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the melt index is low, and it cannot be rotationally molded at one time. That is to say, the existing polypropylene pipes are all lined with plastic, which not only has uneven flanging, but also cannot withstand negative pressure.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Steel lined polypropylene PP pipe

[0020] Technical index:

[0021] A. DN80 steel rotomolding polypropylene PP pipe, the pipe is 20#, the outer diameter is ￠108mm, the steel pipe thickness is 4.5mm, the inner diameter is 108-9=99mm, the inner lining thickness is 3mm, each length is 6 meters, including method Blue noodles. Steel pipe standard: GB / T8163; flange standard: HG20593-97;

[0022] B. Design pressure: PN1.0;

[0023] C. Design temperature 105℃;

[0024] D. Medium: 70% sulfuric acid solution with a small amount of solvent (not more than 2%);

[0025] E. Lined with polypropylene PP resin, thickness: 3mm ± 0.3mm;

[0026] Unloading: Cut a DN80 pipe with a length of 6 meters on the cutting machine.

[0027] Welding: Welding flanges on pipes and fittings requires double-sided welding.

[0028] Polishing: Polish the solder joints of the welding place smoothly. If you find pores, you need to repair it in time.

[0029] Surface: Remove welding slag, spatter and other attachments, ...

Embodiment 2

[0039] Steel lined polypropylene PP pipe

[0040] Technical index:

[0041] A. DN200 steel rotomolding polypropylene PP pipe, the pipe is 20#, the outer diameter is ￠219mm, the steel pipe thickness is 6mm, the inner diameter is 219-12=207mm, the lining thickness is 5mm, each length is 8 meters, including flange surface. Steel pipe standard: GB / T8163, flange standard: HG20593-97

[0042] B. Design pressure: PN1.6;

[0043] C. Design temperature 100℃;

[0044] D. Medium: hydrochloric acid solution;

[0045] E. Lined with polypropylene PP resin, thickness: 5mm±0.5mm;

[0046] Unloading: Cut a DN200 pipe with a length of 8 meters on the cutting machine.

[0047] Welding: Welding flanges on pipes and fittings requires double-sided welding.

[0048] Polishing: Polish the solder joints of the welding place smoothly. If you find pores, you need to repair it in time.

[0049] Surface: Remove welding slag, spatter and other attachments, and clean the surface grease and soluble dirt.

[0050] Sandbla...

Embodiment 3

[0059] Steel lined polypropylene PP pipe

[0060] Technical index:

[0061] A. DN350 steel rotomolding polypropylene PP pipe, the pipe is 20#, the outer diameter is ￠377mm, the steel pipe thickness is 8mm, the inner diameter is 377-18=359mm, the inner lining thickness is 6mm, the length is 12 meters, including flange surface.

[0062] B. Design pressure: PN1.0;

[0063] C. Design temperature 85~100℃;

[0064] D. Medium: Hydrofluoric acid solution;

[0065] E. Lined with polypropylene PP resin, thickness: 6mm±0.5mm:

[0066] Unloading: Cut a DN200 pipe with a length of 12 meters on the cutting machine.

[0067] Welding: Welding flanges on pipes and fittings requires double-sided welding.

[0068] Polishing: Polish the solder joints of the welding place smoothly. If you find pores, you need to repair it in time.

[0069] Surface: Remove welding slag, spatter and other attachments, and clean the surface grease and soluble dirt.

[0070] Sandblasting: Using emery with a particle size of 1.5mm an...

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Abstract

The invention relates to a manufacturing method of a steel rotational moulding pipeline with modified polypropylene inner liner, which comprises the steps of: welding, sandblasting, heating and heat preservation, rotational moulding, cooling, negative pressure test, positive pressure test, detection of an inner liner and the like; the modified polypropylene inner liner inside the pipeline manufactured according to the invention has the prominent characteristics of good compactness, high mechanical properties, strong integrity, no joint and welding seam, even thickness, high / low temperature and negative pressure resistance, strong adhesive force, corrosive resistance, impact resistance, no toxicity, convenient maintenance, etc. The steel rotational moulding pipeline, as an ideal material for taking the place of rubber, glass steel and stainless steel, is quite stable for a long time in various strongly corrosive media such as organic acid, inorganic acid, base salt, etc., and is prominently characterized by acid-base mixing, quick heating and cooling or cold / hot alternation.

Description

Technical field [0001] The invention relates to the technical field of pipe manufacturing, in particular to a method for manufacturing a steel rotomolding pipe with a modified polypropylene inner lining layer. Background technique [0002] Corrosion has always been one of the most headache hazards in the chemical industry. A little carelessness can damage equipment, or cause accidents or even disasters. According to relevant statistics, about 60% of the damage of chemical equipment is caused by corrosion. Polypropylene has good chemical stability and is insoluble in general solvents at room temperature. It is almost stable except for high concentrations of sulfuric acid, nitric acid, aqua regia, tetrahydrofuran and tetrachloroethane, and is resistant to alkalis. Polypropylene products have a smooth surface, excellent wear resistance, and low air permeability and water permeability. Polypropylene has high mechanical properties, and its yield strength and tensile strength are bet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L9/147F16L58/10
Inventor 张琼
Owner 江苏兆辉防腐科技有限公司
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