How does the coal tar enamel coating or lining protect the pipeline?
Sometimes clients ask for the coal tar enamel coating or lining for the pipeline.We all know that coating or lining could protect the pipeline from corrosion and expand the service life.But how does it works?
The coal tar pitch, which forms the basis for the coal tar enamel (CTE), consists of stable molecules that are formed during coking operations at about 1,300°C. The fillers and coal add flexibility and strength to the product. The strong molecular arrangement provides CTE with the characteristics necessary to produce pipeline corrosion protection. These can be summarized as follows:
- Water resistant — negligible water absorption and vapor transmission.
- Stable chemical structure — resistant to acid and alkali
- Resistant to cathodic disbonding — most pipelines are protected using impressed current or sacrificial metal anodes; CTE is resistant to the alkaline environment formed at exposed metal surfaces.
- High electrical resistance — even after two years’ immersion in water, the electrical resistivity remains 1014-ohm cm3.
- Adhesion — forms a strong permanent bond to the steel surface.
- Resistant to attack by bacteria, marine organisms and root penetration.
From the above information,we could understand why the coal tar enamel coating or lining required for the piping goods.
Our company,Hebei Haihao Group can manufacture various coatings or linings for steel pipes and fittings.Welcome to contact us if any related goods required.Email:email@example.com