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Insulating pipeline spray coating opening mending method

A technology for insulating pipes and filling joints, which is applied to coatings, devices for coating liquid on the surface, and surface pretreatment, etc. It can solve the problems of reduced pipe insulation life and achieve good temperature resistance stability and good bonding and compounding properties , The effect of fast reaction and curing speed

Active Publication Date: 2005-03-23
大庆油田建设集团
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the heat-shrinkable sleeve used and the polyethylene yellow jacket skin are easily separated from the existing heat-insulating pipeline repairing method, which reduces the heat preservation life of the pipeline, the present invention provides a spray-coating repairing method for heat-insulating pipelines. The impact of environmental factors is small, the coating has good compatibility with the pipe body, and can form a close and continuous insulation system with the original insulation layer without separation

Method used

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Embodiment Construction

[0010] The method of spraying and repairing the thermal insulation pipeline is to carry out sandblasting and derusting at the nozzle of the thermal insulation pipeline after the nozzle of the thermal insulation pipeline is welded. The sandblasting and derusting of the nozzle adopts an environmentally friendly sandblasting machine, which can be recycled while sandblasting, and is sprayed by a vacuum pump. The sand reflected on the metal surface and the generated dust and scale are sucked into the recovery room of the sandblasting machine, and the sand is reused after being filtered. Using this sandblasting machine, there is no dust in the air, no floating dust on the surface of the pipe body, no further cleaning process, the rust removal quality is above Sa2.5, and the sand material is 25-40 mesh brown corundum sand or steel sand with good wear resistance , the heat preservation of the joint can be realized through the following steps:

[0011] 1. The surface treatment of the o...

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Abstract

A spray method for reparing the isulating layer at the connection position bewteen two insulating pipes includes such steps as blasting sand, treatnig the surface, brushing the priming paint, spraying polyurethane foam, and spraying polyurea paint.

Description

Technical field: [0001] The invention relates to a method for repairing joints of thermal insulation pipelines in the field of construction of thermal insulation pipelines, and belongs to a method for repairing joints of thermal insulation pipelines by spraying. Background technique: [0002] At present, the insulation pipe is usually filled with polyurethane foam outside the pipe and wrapped with polyethylene yellow jacket leather. The insulation layer of the main body of the pipeline is prefabricated by a special automatic operation line in the factory. The process control is relatively easy. The insulation layer and protective layer The quality of the pipe is relatively reliable, and 100-200mm should be reserved at both ends of each pipe without insulation, and it will be repaired after on-site welding. On-site joints are usually foamed in small packages, and heat-shrinkable sleeves are used to cover the joints. This jointing method is greatly affected by environmental fa...

Claims

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Application Information

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IPC IPC(8): B05D1/36B05D3/00B05D7/24
Inventor 陈守平莫荣樊三新刘古文吴迪王尧王秀章
Owner 大庆油田建设集团
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