Method for joint coating on pipeline by heat-shrinkable tape
A heat-shrinkable tape and pipe technology, applied in pipeline protection, pipeline anti-corrosion/rust protection, pipe components, etc., can solve problems such as weak anti-corrosion, slack and detachment, damage to heat-shrinkable sleeves, etc., to achieve simple processing and long-term performance stability , The effect of convenient operation and control
Active Publication Date: 2010-05-19
北京双元油通工程技术有限公司
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Problems solved by technology
The disadvantages of this traditional heat-shrinkable sleeve (belt) jointing technology in use are: the heat-shrinkable sleeve (belt) jointing technology does not solve the problem of effective bonding between the jointing material and the PE base material, including the primer and the jointing. The bonding of the PE material in the area and the bonding of the heat-shrinkable sleeve (tape) with the primer and PE, with the destruction of environmental stress, the heat-shrinkable sleeve (tape) is prone to loosening and detachment, resulting in poor anti-corrosion effect in the patching area; Shrink sleeve (tape) filling technology requires high heating operation, and the heating degree must be strictly controlled. When the heating is insufficient, the hot melt adhesive will not completely melt, resulting in voids or bonding defects in the heat shrink sleeve (tape) structure, resulting in weak corrosion protection. When overheating, the heat shrinkable sleeve (belt) will be carbonized, resulting in damage to the heat shrinkable sleeve (belt); the sealing technology of the heat shrinkable sleeve (belt) is limited by the temperature resistance of the hot melt adhesive, and its application temperature range is low
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0027] The present invention is described in detail below through the embodiment, a kind of heat-shrinkable tape pipe sealing method, and its process step is as follows:
[0028] a. Polarization treatment with heat shrinkage
[0029] The inner surface of the heat shrinkable tape without hot melt adhesive is roughened by sandblasting or manual grinding. After the surface is cleaned, it is polarized with a gas treatment agent. The treatment process is: put the heat shrinkable tape In a closed space, extract more than 50% of the air in the space, and then fill in the gas treatment agent, which is composed of 10% fluorine, 45% helium and 45% nitrogen, and keep it for a period of time Finally, use the exhaust gas treatment device to extract the gas treatment agent, open the closed space, take out the heat shrinkable tape that has been polarized and pack it;
[0030] b. Sand blasting treatment on the surface of the joint
[0031] The surface of the metal object on the surface of t...
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Abstract
The invention discloses a method for joint coating on pipeline by heat-shrinkable tape, which comprises the following process flows of: polarization treatment on the heat-shrinkable tape, blasting treatment on a surface of the joint coating, gas treatment on the surface of the joint coating, preservative treatment on the surface of the joint coating, wrapping the heat-shrinkable tape on the surface of the joint coating and other procedures. The method has the advantages of simple process, simple and convenient operation, strong bond strength, high anti-corrosive property, long service life, wide adaptive temperature range, and convenient construction, and is beneficial to popularization and application.
Description
technical field [0001] The invention relates to the technical field of steel pipeline construction, in particular to a method for repairing joints of pipelines with heat-shrinkable belts. Background technique [0002] Pipeline construction widely exists in many industries such as petroleum, chemical industry, electric power, communication, municipal and construction. The steel pipes used in pipeline construction must be anti-corrosion-treated pipelines. 3PE anti-corrosion structures are commonly used for external anti-corrosion of pipelines Practice has proved that this anti-corrosion structure has relatively ideal comprehensive performance, and in pipeline construction, the anti-corrosion at the weld seam of the steel pipeline joint is completed on the construction site, and the performance of the pipeline joint anti-corrosion technology used It has a significant impact on the overall anti-corrosion effect of the pipeline, and to some extent, it determines the success or fa...
Claims
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IPC IPC(8): F16L55/168F16L58/02
Inventor 魏强邦王国境
Owner 北京双元油通工程技术有限公司
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