Custom Fire Fighting Pipes,Seamless and Welded Steel Pipes Manufacturer Since 1991.
External Coating Pipe
Baolai Steel supplies external coated steel pipes with FBE, 2PE, 3PE and 3PP coating systems for pipelines requiring corrosion protection. Coating selection depends on service environment, operating conditions and project requirements, including buried pipelines, water transmission and industrial applications.
Coating services provided by BAOLAI STEEL have resulted in cost savings ranging from millions to billions of dollars in the construction of numerous oil, gas and water transmission projects.That’s why corrosion-resistant coatings for pipelines are critical to pipeline owners, who can’t afford transmission outages due to pipeline corrosion.
External Coating Pipe Type
From liquid epoxy resin, single-layer FBE to cement lining corrosion protection, BAOLAI not only provides a safe and pollution-free pipeline environment for transporting liquids, but also improves the corrosion resistance of the pipeline. BAOLAI stands out among internal pipe coating companies with profesional solutions.
External Liquid
The liquid epoxy pipeline coating process is very easy. The chemical reaction between the epoxy resin and hardener or catalyst liquid epoxy produces，which transforms the two into the hard laye. You can apply epoxy by hand or spray after mixing.
The use of liquid epoxy usually in this area welds size cover, fittings, valves, as well as for the rehabilitation field of short parts of the tubes. He also works as an additional layer of protection at the front of the soil into the air, where underground plumbing meets the atmosphere.
External FBE
Fusion Bonded Epoxy (FBE) coated carbon steel pipes are widely used in the oil and gas industry, as well as water and wastewater industries. FBE coating provides strong adhesion, corrosion resistance and a reliable protective barrier between the steel pipe surface and the surrounding environment. It is commonly selected for pipeline applications where long-term corrosion protection and coating performance are required. Apart from the fact that the coating is non-toxic, epoxy coated steel gas pipes have a smooth surface that is easy to clean and maintain.
ARO(Dual-layer Abrasion Resistant Outer Coating FBE)
Dual-layer Abrasion Resistant Outer Coating (ARO) FBE systems provide excellent protection for pipelines in a variety of service applications, including directional drilling and abrasion-resistant roadway and stream crossings, resistance to mechanical handling, and high-temperature service in humid environments.
2PE/2PP
The structure of 2LPE coatings for pipelines: the first layer is an adhesive (AD) and the second layer is polyethylene (PE). The two materials are mixed with each other and each layer is the same thickness as the 3LPE coating. This provides first-class protection against corrosion, especially at high temperatures. 2LPP is the same process as 2LPE, except that the second layer is polypropylene (PP).
3PE/3PP
3-Layer Polyethylene (3LPE) offers superior protection against corrosion compared to 2LPE.The FBE layer provides an effective barrier against corrosion, while the PE layer resists water penetration and mechanical damage.
3PP coating is composed of epoxy powder base layer, middle layer adhesive, and outer layer polypropylene (PP) sheath. 3PP coating has all the advantages of 3PE coating and significantly improves its operating temperature performance.
Concret Weight Coating
Concrete weight coating pipe (CWC pipe), is a steel pipe that has been externally coated with concrete. The concrete coating consists of a mixture of cement, aggregates, reinforced steel mesh, and water.
Concrete weight coatings provide reliable negative buoyancy and protect against harsh environments and possible mechanical damage to pipes and their thermal insulation coatings during handling, transportation and pipe installation.
Insulation Coated Pipe
High-temperature prefabricated direct-buried thermal insulation steel pipe is a direct-buried prefabricated thermal insulation steel pipe with good thermal insulation performance, safety and reliability, and low construction cost.
The insulation material is rigid polyurethane, which has good mechanical properties and thermal insulation properties. Insulated steel pipes are widely used in chemical pipeline insulation projects such as liquid and gas transmission pipe networks, petroleum, chemical, central heating and heating pipe networks, central air-conditioning ventilation pipes, and municipal engineering.
FAQ
1. How do I choose between FBE, 3LPE, and 3LPP pipe coatings?
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FBE provides a bonded corrosion-protection layer and is widely used for buried oil, gas, and water pipelines. A 3LPE system adds an adhesive layer and polyethylene outer layer, providing additional resistance to moisture and mechanical damage. A 3LPP system uses polypropylene as the outer layer and may be considered where higher operating temperatures or specific mechanical properties are required. Selection should be based on temperature range, soil conditions, installation method, handling loads, and the governing project specification.
2. What external coating is suitable for directional drilling or abrasive installation?
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Pipelines installed by horizontal directional drilling, boring, or through rocky ground may require greater abrasion resistance than a standard corrosion coating alone provides. An abrasion-resistant overlay, often used over FBE, may help protect the primary coating during pulling and installation. The required system should be determined from the installation length, soil or rock conditions, pulling forces, bend radius, and repair provisions.
3. How are field joints protected after coated pipes are welded?
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Factory coating normally stops short of the pipe ends to provide a weld cutback area. After field welding and inspection, the exposed joint area is cleaned and protected with a compatible field-joint coating, such as heat-shrink sleeves, liquid epoxy, FBE, or another specified system. Compatibility with the mainline coating, surface preparation, application temperature, and overlap dimensions should be confirmed in the project procedure.
4. What inspections are commonly performed on external pipe coatings?
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Typical inspections may include surface cleanliness and profile, application temperature, coating thickness, visual appearance, holiday detection, adhesion, impact resistance, and cutback dimensions. The exact tests and acceptance limits depend on the coating type and project standard. Inspection records should be agreed upon before production, particularly when third-party verification is required.
5. Can one external coating be used for every buried pipeline?
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No single coating is necessarily suitable for all buried pipelines. Soil resistivity, moisture, chlorides, operating temperature, cathodic protection, handling conditions, installation method, and expected service life can change the required system. The coating should therefore be selected as part of the overall corrosion-control design rather than based only on coating price.
