Method for joint coating on pipeline by heat-shrinkable tape

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

A method of sealing pipes with heat-shrinkable tape technical field 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 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 e...

AI Technical Summary

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