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Requirements for anti-corrosion sleeves for oil and gas pipelines

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Requirements for anti-corrosion sleeves for oil and gas pipelines

Release date:2018-01-21 Author: Click:

1.General requirements for steel pipe repair

Before repairing the joint, the joint must be cleaned, and the burrs, welding slag, dirt, oil and other debris in the circumferential weld and its vicinity should be cleaned. The surface of the repaired part shall be derusted. The quality of the surface derusting treatment shall reach the Sa2.5 ~ Sa3.0 grade specified by the surface rust grade and derusting grade GB / 8923 of the steel before painting. You can use sandblasting or power tools to remove rust. The polyethylene layer at the overlapped part should be polished to have a rough surface. The end should be beveled, and the end of the slope should be beveled. The slope angle should not be greater than 30 degrees. Warm up. The overlap width of anticorrosive and polyethylene anticorrosive layer should not be less than 100mm. If the humidity is greater than 85% or it is raining or snowing, construction should be stopped.

一分彩2.Quality inspection after construction

一分彩① Quality inspection of anti-corrosion heat shrinkable sleeve or winding tape

The appearance of the patch should be inspected one by one. The anti-corrosion heat shrink sleeve or surface should be smooth and flat, no wrinkles, no bubbles, and the slopes at both ends should be tightly fitted with the heat shrink sleeve without gaps and no carbonization on the surface. The heat shrinkable sleeve should have hot melt adhesive evenly overflowing in the circumferential direction. A pinhole inspection shall be performed one by one with a spark leak detector at the fill point, and the leak detection voltage is 15Kv. If pinholes appear, make up again. The adhesion of the anti-corrosion heat-shrinkable sleeve should meet the requirements, and the peel strength should be not less than 50N / cm when the temperature of the tube is about 25 degrees and 5 degrees.

② Quality inspection of anticorrosive paint (primer)

The quality of the anticorrosive coating (primer) is mainly the detection of leakage points. After the coating is completely cured and cooled to ambient temperature, each patch is tested. Use spark detection equipment. Detection voltage: ordinary level 2Kv, enhanced level 2.5Kv, when the test head contacts the coating, it moves at a speed of about 0.2m / s.


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Suzhou Qiangjiang Pipeline Anticorrosive Material Co., Ltd.

Contact: Cheng Huiqiang

Contact : Li Cong
Telephone:0512-63982510 Mobile phone:13962536717

Mobile phone:13806256210

Fax:0512-63982520
Address: No. 333, Jinxian Road, Jinjiaba, Wujiang District, Suzhou, Jiangsu
Website:www.diendanthanhly.net

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