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carbon steel pipe coating

Coated pipe has a special material applied to the surface of steel pipe. It’s designed to provide additional protection, improve performance, and adapt to specific application needs.

These coatings are often used to prevent corrosion and rust. They can also insulate or improve specific properties of pipes.

Different types of coated pipes can be used for different applications. For example, some are corrosion-resistant, insulated, or used to transport special substances. Some common coatings include hot-dip galvanizing, polyethylene (PE) coating, polypropylene (PP) coating, and epoxy resin (Epoxy) coating.

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Specifications of Coated Pipe

Name: Coated Pipe
Standard: API 5L, API 5CT, ASTM A53, ASTM A795, DIN 30670, DIN 30671, DIN 30678, JIS G 3422, CAN/CSA-Z245.21, NFA 49-710, ISO DIS21809-1
Sizes:
Out diameter: 1/8″ and up ( 10.3mm and up, DN6 and up)
Thickness: 1.65mm and up(SCH 5S ~SCH XXS)
Length: 6 meters, 12 meters, or customized
General Coating: Oiling, Clear & Black Varnishing
Anticorrosive Coating: FBE Coating, PE Coating, PP Coating
Pipe End Process: Plain End, Bevelled End, Screw Threaded End, Roll Grooved End
Pipe Connection: Elbow, Tee, Cross, Reducer, Flange, Coupling, Clamp, Shoulder Ring
Machining Service: Expanding, Flaring, Swaging, Tapering, Bending, Welding, Hole Drilling, Hole Punching
Application Fields: Petroleum, Conveyance, Photovoltaic Power, Solar Power, Building Structure

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Types Of Coated Steel Pipes

FBE Coated Pipe

“FBE Coated Pipe” is a special form of “Epoxy Coated Pipe” that uses a melt-bonding method, Fusion-Bonded Epoxy (FBE), to ensure a strong and durable coating.

The Fusion Bonded Epoxy (FBE) coating serves as a protective measure against corrosion on the surfaces of pipes. The application of double or triple layers of FBE can enhance both friction and abrasion resistance. In 3-layer PE/PP coating systems, the FBE coating is employed as the priming layer.

In a process conducted at temperatures ranging from 220 to 235°C, electrostatic epoxy powder is sprayed onto the pipe. Upon reaching the hot pipe surface, the epoxy powder undergoes melting, creating a uniform epoxy coating layer on the pipe.

Dual Layer FBE Coated Pipe

Dual-layer FBE is used in various service scenarios. These encompass directional drilling, protection against abrasion for road and river crossings, and the coating of oil, gas, and waterworks pipes.

Similar to the previously mentioned single-layer FBE coating, this particular coating is applicable across a broad spectrum of outer diameter (OD) sizes, ranging from 3.5″ to 48″.

In most cases, the outer layer prioritizes abrasion resistance. It acts as a safeguard against erosion.

2LPE Coated Pipe

Two-layer extruded polyethylene coating (2LPE) refers to two layers of pipeline protection. Mastic-based adhesives and polyethylene copolymers are used in the two-layer construction. This provides excellent corrosion prevention, especially at high temperatures.

2LPP Coated Pipe

The 2LPP System is a multi-layer powder coating system made up of two functional components. This anti-corrosion system is made up of a layer of polypropylene followed by a coating of high-performance fusion-bonded epoxy (FBE).

3PE Coated Pipe

To address the drawbacks of individual anti-corrosive methods, the three-layer polyethylene (3PE) anti-corrosive coating integrates the characteristics of epoxy powder FBE and the two-layer PE coating.

The principal anti-corrosive agent is FBE. PE primarily protects FBE (mechanical damage resistance) and has excellent water penetration resistance.

The three-layer polyethylene coating technique imparts exceptional mechanical properties to meet the requirements of the coating material, allowing the coating to function at temperatures up to 50°C (for low density and medium density POLYETHYLENE) or 70°C (for high-density POLYETHYLENE).

3PP Coated Pipe

The three-layer polypropylene (3PP) anti-corrosive coating consists of an initial layer of epoxy powder, an intermediary layer of binder, and an outer layer of PP (polypropylene) jacket.

The 3PP incorporates all of the benefits of the 3PE while significantly improving its temperature performance in service. The predominant use of 3PP coating lies in serving as an anti-corrosion layer for pipelines carrying high-temperature media. Additionally, it functions as a corrosion-resistant layer for pipelines in desert areas characterized by elevated surface temperatures and prolonged exposure to sunlight.

As a result, subterranean water, gas, and oil pipelines have become increasingly popular in places with high surface temperatures and long daylight duration.

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What is internal pipe coating?

Internal pipe coating is the process of applying specific paints to the internal surfaces of pipes. This coating forms a protective layer on the inside of the pipe and can serve a variety of purposes such as corrosion protection, friction reduction, and improved fluid transfer efficiency, among others.

The internal coating of pipelines usually needs to consider factors such as chemical resistance, corrosion resistance, adhesion and influence on the transported substances of the coating. These coatings can be applied to the internal surface of pipes by different methods such as spraying, brushing, coating, pouring, etc.

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What is external pipe coating?

Coated pipelines for the oil and gas industry can be located all over the world. Pipelines can be installed above ground, underground, or immersed in fresh or saltwater.

Coatings for external pipelines must be designed to withstand a diverse range of climatic conditions. Soil stress, soil-borne pollutants, and saltwater all pose significant difficulties to the performance of external pipeline coatings.

External coatings need to withstand exposure to indigenous bacteria, other flora, wastewater, and the chemicals and solvents utilized in hydrocarbon processing.

Pipelines are present in hot desert regions, where temperatures often exceed 100°F, and in Alaska, where temperatures can drop below -76°F. Subsurface conditions in permafrost zones, where ground temperatures rarely surpass 32°F, make subterranean pipe construction challenging and virtually always necessitate above-ground pipeline installations.

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How is Coated Pipe Made?

The Process of Inernal Coated Pipe

The Process of Exernal Coated Pipe

Why Pipe Coating Is Important?

Corrosion Protection:

A primary objective of pipe coating is to safeguard the metal surface of pipes against corrosion. Corrosion can weaken the structure of pipes over time. This can lead to leaks, failures, and a reduced lifespan. Coatings function as a protective barrier, deterring corrosive substances from making direct contact with the pipe material.

Enhanced Performance:

Certain coatings can improve pipe performance. They offer supplementary characteristics, including heightened resistance to abrasion, impact, or chemicals. This is especially crucial in industrial settings. Pipes there may be exposed to harsh substances or undergo abrasive processes.

Cost Savings:

Investing in pipe coating can result in long-term cost savings. By preventing corrosion and deterioration, the necessity for frequent repairs and replacements is diminished. This saves material and labor costs over the pipeline’s lifetime.

Extended Lifespan:

Coatings prevent corrosion and other forms of degradation. They help pipes withstand harsh environmental conditions. This ensures pipes remain in service for an extended period. It does not compromise structural integrity.

Insulation and Temperature Resistance:

Coatings can offer thermal insulation. They protect pipes from extreme temperatures and prevent heat loss or gain. This is important in industries where temperature control is critical. This includes oil and gas pipelines.

Compliance with Regulations:

In various industries, strict adherence to compulsory environmental and safety regulations is crucial.Coating pipes to meet specific standards ensures that companies adhere to regulatory requirements. It also helps them avoid penalties.

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