Applications of Electric Resistance Welded Pipe

Electric Resistance Welded Pipe (ERW) utilizes high-frequency current to heat the edges of a steel strip to a molten state, then mechanically fuses the two edges together to form a steel pipe with a straight seam. It is a commonly used welded steel pipe, offering advantages such as high production efficiency, low cost, high dimensional accuracy, and excellent weld quality. It is widely used in the oil and gas, construction, and machinery manufacturing industries.

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1. Petroleum and Chemical Industry
In the petrochemical industry, ERW pipe is widely used in pipeline systems transporting fluids such as oil, natural gas, and chemical raw materials. Its excellent corrosion resistance and pressure resistance ensure safe pipeline operation.

Oil and Gas Pipelines: ERW pipe is used for medium and low-pressure oil and gas transportation and offers excellent sealing and pressure resistance.
Oil Well Casing: Some ERW pipes can be used as structural support for shallow oil wells.
Refinery Pipelines: Suitable for fluid transport pipelines within refinery equipment.

2. Construction and Structural Engineering
In the construction sector, ERW pipe is commonly used in beams, columns, scaffolding, and other parts of building structures. It provides sufficient strength and stability while facilitating construction and installation.

Building Steel Structures: Used as support pipes for large structures such as building frames, bridges, and stadiums.
Scaffolding: ERW pipe is commonly used in building scaffolding due to its lightness and high strength.
Guardrails and Fences: Used in municipal engineering projects, highway guardrails, and more.

3. Machinery Manufacturing and Equipment
In the machinery manufacturing sector, ERW pipe can be used to manufacture a variety of mechanical parts, tools, and equipment, such as automobile frames, agricultural machinery, and furniture. It can be processed and designed to meet diverse manufacturing requirements.

Hydraulic System Piping: Used as hydraulic oil pipes for construction machinery and agricultural equipment.
Conveyor Machinery: Used for conveyor rollers and drive shafts.
Chassis Structural Components: Some automobile chassis and body structures utilize ERW pipe.
Exhaust Systems: Some vehicle models use ERW steel pipe for exhaust pipes.

4. Water Supply and Drainage Systems
In the water conservancy industry, ERW pipes can be used to manufacture water supply and drainage pipes for water conservancy projects.
Urban Water Supply Pipes: ERW galvanized steel pipes are commonly used in municipal water supply systems.
Drainage Pipes: Some building drainage systems use ERW pipes.

5. Agricultural Applications
Greenhouse Structures: Used to construct greenhouse frames.

Irrigation Systems: Some agricultural irrigation pipes use ERW pipes.

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Additional reading:
How to Specify a Hydraulic Breaker | Construction Equipment In addition, ERW pipes are widely used in the power generation and transportation sectors. In the power generation industry, they can be used to manufacture transmission line towers and conductor supports; in the transportation industry, they can be used to manufacture transportation infrastructure such as railway bridges and highway guardrails.

Why do these industries choose ERW pipes?

1. Low Cost: Compared to seamless steel pipes, ERW pipes offer high production efficiency and are more economical.
2. High Dimensional Accuracy: Suitable for precision machinery and building structures.

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3. Reliable Weld Strength: Modern ERW technology ensures weld strength close to that of the parent material. 

4. Highly Customizable: Pipes of varying diameters and wall thicknesses can be produced to meet diverse needs.

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In short, ERW pipes have a wide range of applications, and their advantages make them a popular material in many industries. With the continuous advancement of technology and the expansion of its application areas, the application of ERW pipes will continue to expand.

Read more: Electric Resistance Welded Pipe Manufacturing Process or Carbon Steel ERW Pipe Specification

I do not claim to be an expert on the subject but there are many reasons to use one or the other. Here are a few reasons that I am aware of:

1) Cost due to availability. 40" seamless pipe would cost a fortune and would probably have a ridiculous lead time for delivery because very few manufacturers have the equipment to produce it. ERW would be much more affordable. Don't quote me on it, but I'm guessing that 1" seamless pipe is probably cheaper than ERW. I'm guessing that a combination of market demand and production methods makes seamless a better option for these small sizes.

2) Cost due to quantity of material. ERW has a longitudinal weld joint quality factor of 0.85 which may require an increase in schedule of pipe for the same pressure/temperature rating.

3) Manufacturing Tolerances. ERW pipe typically has a manufacturing tolerance of 0.01" while seamless has a tolerance of 12.5%. This will affect the wall thickness calculations. It is also easier for the manufacturer to make the wall thickness on ERW pipe closer to the -0.01" tolerance than the -12.5% on seamless. This allows the manufacturer to use less material, reducing costs. (The ERW is made from strip material which is easier to control thicknesses on than the seamless pipe.)

4) Welding concerns in sour service. Even though NACE MR allows the use of ERW, many owners will only allow seamless pipe up to sizes where the cost of seamless becomes prohibitive.

Basically it comes down to cost vs. quality. (Although manufacturers of ERW pipe will insist that ERW is as good as seamless.) In general, seamless is a Cadillac solution.

I have only addressed ERW piping here, but the same will hold true for most types of welded pipe. Unless it is specifically prohibited, welded pipe can be used almost anywhere seamless pipe can PROVIDED that the piping is designed properly.

Once again, these are just my thoughts based on limited experience...