Pipeline joint coating method

Pipeline joint coating method

  • CN 104,500,918 A
  • Filed: 12/17/2014
  • Published: 04/08/2015
  • Est. Priority Date: 12/17/2014
  • Status: Active Application
First Claim
Patent Images

1. a method for joint coating on pipeline, is characterized in that, comprises the following steps:

  • A. surface treatment;

    scrubbing and derusting by sandblasting are carried out to the steel tube surface at joint coating on pipeline position;

    B. steel pipe preheating;

    the steel pipe at joint coating on pipeline position is preheating to 50-75 DEG C;

    C. priming is coated with;

    whole surface epoxy primer being evenly coated in repaired mouth position steel pipe;

    D. repaired mouth sheet wraps;

    after epoxy primer surface drying, wraps repaired mouth sheet on the surface of epoxy primer;

    E. silica gel piece heating;

    adopt silica gel heating sheet to be wrapped in the outside of repaired mouth sheet, repaired mouth sheet is heated;

    F. gasbag pressurizes;

    exert pressure with the outside of air bag to silica gel heating sheet, there is pressure-bearing steel bushing air bag periphery;

    G. pressurize cooling;

    air bag keeps certain pressure, cuts off silica gel heating sheet power supply, progressively cools to less than 60 DEG C.

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