5 Reasons Why Your Business Needs Tpep Coating Steel Pipe？

Due to the coating and the surface of the workpiece, or between the old and new coating lost adhesion, the coating surface formed small pieces or scales off, if the adhesion between the coating and the surface is completely lost, the paint film whole piece drops, this phenomenon is called "off", also known as peeling off. Coating peeling is also a common major coating defect. Coating peeling is generally caused by the following reasons.

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The surface treatment of the coated workpiece is insufficient and too smooth. Before coating, substrate without surface treatment or treatment is not complete, surface residual moisture, oil, oxidation skin, etc. The adhesion of the film usually comes from two aspects. On the one hand, it is the physical attraction and the bonding force between the tiny structure of the domain structure, such as hook, lap, tangle, and winding. On the other hand, it comes from the forces of various chemical bonds. If the substrate is too smooth, the physical binding force of the film on the substrate will become weak, resulting in the film can not adhere to the substrate and fall off.

The wrong choice of primer causes the paint to peel. If the paint film is too hard so that the surface paint is not easy to adhesion or the primer gloss is too big and other reasons. The bottom and top paint do not match, resulting in poor adhesion between layers.

If the film is too thick or the film is not dry between layers, encounters moisture, etc., the film drying condition is poor. If the coating thickness of the top coat is super thick or the solvent in the primer cannot be fully played out for other reasons, the coating interface between the layers will form a honeycomb because of the presence of the solvent, making the coating lose, the strength decreases, resulting in a decrease in adhesion, and once damaged, it will cause shedding.

Prevention and treatment: The coating should be dry and polished before coating (brush, roller, or spray) finish to increase adhesion between coatings. But also prevent the primer from drying out too much. After EXCESSIVE drying OF THE primer, the lack of active polar groups in the primer leads to the lack of binding force from chemical bonds between the top coat and the primer, which will reduce the interlayer adhesion and lead to shedding.

To prevent disbonding, also note that it is forbidden to be coated material exposure time is too long, exposure time is too long, substrate and primer easy to foreign bodies such as oil pollution, surface occurs pulverization or due to long time exposure to generate a new chemical, paint can't contact with primer or substrate fully, will also affect coating adhesion between, caused fall off.

For performance reasons resulting in peeling coating itself is rare, mostly because the substrate processing is not clean, or primer for more than the required coating intervals without cleaning in accordance with the requirements, therefore before cleaning work to ensure sufficient adhesion between the coating and avoid abuse of critical. In chemical smoke or outdoor environment, use a quick-drying coating to shorten the coating time; Avoid working in humid environments, or use wet curing paint. Operate strictly in accordance with the required temperature and time, and control in accordance with the technical procedures.

Cangzhou shenlong pipe manufacturing co., ltd. Is engaged in oil, gas, water, coal slurry mixing medium steel pipeline coating operations, anti-corrosion, insulation, piping is set in a body's specialized pipeline engineering precast construction enterprises, products used in an oil pipeline, chemical piping, electrical, pipe, gas pipe, heat pipes, sewage pipes, etc. Anti-corrosion processing of straight line and bend pipe DN40- three-layer structure polyolefin (PE, PP, TPEP,3LPE) steel pipe coated with anti-corrosion, DN40- steel hot stewed bend pipe and pipe fittings coated with FBE, epoxy resin coating anti-corrosion, DN40- steel pipe inner wall resistance reduction, solvent-free epoxy steel pipe, epoxy paint anti-corrosion, Coated plastic steel pipe, dip plastic steel pipe. They are lined with plastic steel pipe PE, PO, PP, PTFE, HDPE, and polymer polyethylene corrosion. The company strictly follows China Petroleum and Natural Gas SY/T-, national GB/T-, German DIN , American AWWA C210, and other international and domestic anti-corrosion standards.

Burying method of TPEP anti-corrosion steel pipe: buried pipe under the dam, consisting of water inlet, pipe body and outlet section. The flow in the pipe can be a non-pressure flow on the free water surface or a pressurized flow filled with a water pipe. Intake can be tower or tilt type, equipped with gates and other control equipment. Non-pressure buried pipe is usually in the form of circular arch straight wall, made of concrete or masonry, mostly circular reinforced concrete pipe. The import elevation shall be determined according to the use requirements. In addition to the buried pipe for water diversion and power generation and the pressure pipe connected behind the pipe, the outlet of the buried pipe under the dam shall be provided with energy dissipation and scour prevention facilities for other purposes.

The wall thickness of TPEP anti-corrosion steel pipe shall be determined through calculation and reference to similar works by burying (trench burial or gallery). In order to prevent the pipe body from breaking or cracking caused by temperature change and uneven settlement of foundation, as well as the concentrated leakage between dam bodies, the design requirements are as follows:

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1. The pipe body shall be set on a good foundation, and concrete or masonry cushion shall be set between the pipe body and the foundation.

2. The buried pipe shall not be placed on the filling of the dam body.

3. Set an expansion joint every 10m-20m along the TPEP anti-corrosion steel pipe, and set a water stop valve at the connection.

4. The anti-seepage structure such as clay core wall or inclined wall shall be thickened at the connection of the pipeline, and 1-2m thick anti-seepage soil shall be backfilled outside the pipeline.

5. Set intercepting rings every 10-20m outside the pipeline to increase the seepage diameter on the pipeline surface and prevent concentrated seepage.

TPEP anti-corrosion steel pipe is a new type of steel-plastic composite pipe developed on the basis of steel pipe. The outer wall adopts three-layer polyethylene anti-corrosion, and the inner wall adopts hot-melt epoxy resin powder anti-corrosion, forming a steel-plastic alloy layer at high temperature, referred to as TPEP anti-corrosion steel pipe.

TPEP anti-corrosion steel pipe is mainly divided into cold coating steel pipe and thermal coating steel pipe. It has excellent mechanical properties, corrosion resistance and aging resistance. It is widely used in water conservancy, electric power, chemical industry, petroleum and other industries, but these properties can not completely eliminate the problem of coating peeling.

Burying technology of TPEP anti-corrosion steel pipe: the buried pipe under the dam is composed of water inlet, pipe body and water outlet. The flow in the pipe can be a non-pressure flow on the free water surface or a pressurized flow filled with a water pipe. It can be tower or tilt type, equipped with control equipment such as gates. Non-pressure buried pipes are usually in the form of circular arch straight walls, made of concrete or masonry. Most of the buried pipes are circular reinforced concrete pipes. The entrance elevation shall be determined according to the use requirements. In addition to the buried pipe for water diversion and power generation and the pressure pipe connected behind the pipe, anti-collision facilities shall be set at the outlet of the buried pipe under the dam for other purposes.

The wall thickness of TPEP anti-corrosion steel pipe is determined by burial method (trench burial, burial or gallery type), and is determined by calculation and referring to similar projects to prevent the pipeline from cracking due to temperature changes and uneven settlement of the foundation. When it breaks, concentrated leakage occurs between the dam body and the dam body.

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