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Manufacturing method of PIR copious cooling prefabricated pipe

A cryogenic and inner tube technology, applied in the field of preparation of PIR cryogenic prefabricated tubes, can solve the problems of shortening the service life of the PIR cold insulation layer, unable to meet the use requirements, and the use effect is not ideal, so as to ensure the cold insulation effect and meet the use requirements. , the effect of improving the use effect

Inactive Publication Date: 2019-12-31
河北中允利合保温材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the prepared PIR cryogenic prefabricated pipe has complex processing technology and unsatisfactory use effect. When PIR cryogenic prefabricated pipe is used overhead, it is easy to contact with water in the air, and it is usually buried underground in LNG filling stations. Or the pipe trench, after a period of use, it is easy to permeate water and form a cold bridge, which loses the cold insulation effect, thereby shortening the service life of the entire PIR cold insulation layer, causing the LNG to quickly gasify and increase the pressure. The LNG filling machine cannot fill LNG vehicles and cannot meet the requirements of use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0020] A kind of preparation method of PIR cryogenic prefabricated pipe is characterized in that, its steps are as follows:

[0021] (1) First, clean the inner pipe, clean the dust and oil on the outer surface of the inner pipe, and dry it at 25-35°C. Use flaw detectors, hydraulic equipment, and air pressure equipment to test the inner pipe body and pass the test. spare;

[0022] (2) Coaxially install the connection section on the pipe section of the qualified inner pipe in step (1), the connection section is a buffer section or a reinforcement section, and an isolation layer is set on the outer surface of the inner tube, and the thickness of the isolation layer is 50-110 μm ;

[0023] (3) To the inner pipe outer binding bracket that step (2) makes, the support is bound on the outer wall of the inner pipe by iron wire, and a circle is set every 1-1.5m;

[0024] (4) Cut the processing plate into the required size and process it into an outer protective tube, and the outer pro...

Embodiment 1

[0033] A preparation method of PIR cryogenic prefabricated pipe, its steps are as follows:

[0034] (1) First clean the inner pipe, clean the dust and oil on the outer surface of the inner pipe, and dry it at 25°C, use the flaw detector, hydraulic equipment, and air pressure equipment to test the inner pipe body, and pass it for use;

[0035] (2) Coaxially install the buffer section on the qualified inner pipe in step (1), and spray the polytetrafluoroethylene release agent isolation layer on the outer surface of the inner tube, the thickness of the isolation layer is 50 μm;

[0036] (3) To the inner tube outer binding bracket that step (2) makes, the bracket is bound on the outer wall of the inner tube by iron wire, and a circle is set every 1m;

[0037] (4) Cut the stainless steel plate into the required size and process it into an outer protective tube, and the outer protective tube runs through the inner tube coaxially after the reel;

[0038] (5) Make pouring holes and v...

Embodiment 2

[0042] A preparation method of PIR cryogenic prefabricated pipe, its steps are as follows:

[0043] (1) First clean the inner pipe, clean the dust and oil on the outer surface of the inner pipe, and dry it at 35°C, use the flaw detector, hydraulic equipment, and air pressure equipment to test the inner pipe body, and pass it for later use;

[0044] (2) Coaxially install the reinforcing section on the qualified inner pipe in step (1), and wrap a polyethylene isolation layer on the outer surface of the inner tube, the thickness of the isolation layer is 110 μm;

[0045] (3) To the inner pipe outer binding bracket that step (2) makes, the support is bound on the outer wall of the inner pipe by iron wire, and a circle is set every 1.5m;

[0046] (4) Cut the color steel processing plate into the required size and process it into an outer protective tube, and the outer protective tube runs through the inner tube coaxially after the reel;

[0047] (5) Make pouring holes and vent hol...

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Abstract

The invention provides a manufacturing method of a PIR copious cooling prefabricated pipe. The manufacturing method of the PIR copious cooling prefabricated pipe comprises the steps that an inner pipeis cleaned and tested, and a qualified inner pipe stays for use; an isolation layer is arranged; a support is bundled up; an outer protective pipe is cut; a hole is formed in the outer protective pipe, and pouring and foaming are conducted; after curing is completed, the PIR copious cooling prefabricated pipe is obtained; and the PIR copious cooling prefabricated pipe is packaged and stored. Themanufacturing method of the PIR copious cooling prefabricated pipe is simple, the outer protective pipe and the inner pipe provided with the isolation layer are adopted, so that the seepage resistanceand leakage resistance of the PIR copious cooling prefabricated pipe are improved; by arranging a connection section, during thermal expansion and cold shrinkage, a PIR cold insulation layer cannot be broken, and the durability of the PIR copious cooling prefabricated pipe is improved; by pouring the PIR heat preservation material in the cavity between the outer protective pipe and the inner pipeand adopting an integrated pouring formation manner, the seepage resistance and leakage resistance of the PIR copious cooling prefabricated pipe are further improved, and the cold insulation effect of the PIR copious cooling prefabricated pipe is guaranteed; and the use effect is improved, and use requirements are met.

Description

Technical field [0001] The invention relates to the technical field of thermal insulation pipe preparation, and in particular to a method for preparing PIR cryogenic prefabricated pipes. Background technique [0002] With the rapid growth of global demand for clean energy, the application of liquefied natural gas (LNG) has developed rapidly. When transporting LNG through pipelines, it is necessary to insulate the pipelines. Polyisocyanurate Foam (PIR) is polyisocyanurate As a new type of cold insulation material in the world, acid ester is usually prepared into PIR cryogenic prefabricated pipes and used in the field of LNG pipeline transportation. [0003] At present, the prepared PIR cryogenic prefabricated pipes have problems such as complex processing technology and unsatisfactory use results. When used overhead, PIR cryogenic prefabricated pipes are easily in contact with water in the air, and are usually buried underground in LNG filling stations. Or the pipe trench, a...

Claims

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Application Information

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IPC IPC(8): F16L59/02F16L59/05F16L59/10
CPCF16L59/028F16L59/04F16L59/10
Inventor 王增光
Owner 河北中允利合保温材料有限公司