What is the ERW?
ERW is another extremely common acronym in the piping and tubing industry, and it stands in contrast to SMLS.ERW pipe is a type of welded steel pipe. Its name comes from the specific method used to create its longitudinal seam.
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| Outside Diameter | Wall Thickness | ||
| DN | Inch | mm | mm |
| 15 | 1/2" | 20~21.3 | 0.95~2.77 |
| 20 | 3/4" | 25~26.9 | 1.1~2.87 |
| 25 | 1" | 32~33.7 | 1.1~4.0 |
| 32 | 11/4" | 40~42.4 | 1.1~4.0 |
| 40 | 11/2" | 47~48.3 | 1.5~7.0 |
| 50 | 2" | 58~60.3 | 1.8~7.0 |
| 65 | 21/2" | 73~76.1 | 2.0~7.0 |
| 80 | 3" | 87~88.9 | 2.2~8.0 |
| 90 | 31/2" | 101.6~102.1 | 2.2~9.0 |
| 100 | 4" | 113~114.3 | 2.2~9.0 |
| 125 | 5" | 140~141.3 | 2.5~10.0 |
| 150 | 6" | 165~168.3 | 2.5~10.0 |
| 200 | 8" | 216~219.1 | 2.75~12.0 |
| 250 | 10" | 272.8~273.2 | 5.0~13.75 |
| 300 | 12" | 323.8~325 | 5.5~13.75 |
| 350 | 14" | 355.6~356 | 5.5~13.75 |
| 400 | 16" | 406~406.4 | 5.75~13.75 |
| 450 | 18" | 457~457.2 | 5.75~17.75 |
| 500 | 20" | 507.9~508.1 | 5.75~17.75 |
| 600 | 24" | 609~610 | 5.75~17.75 |
What is the SMLS?
SMLS is an abbreviation for Seamless.Therefore,SMLS pipe represents seamless pipe.
In the context of piping, SMLS pipe is a pipe without a weld seam along its length. It is manufactured as a single, continuous piece of material, making it stronger and more reliable for high-pressure and critical applications.It is most frequently used in engineering, manufacturing, and construction, particularly in the context of piping and tubing.
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| DN | OD | SCH40 | SCH80 | SCH160 | |
| INCH | (mm) | (mm) | WT | WT | WT |
| 1/2" | 15 | 21.3 | 2.77 | 3.73 | 4.78 |
| 3/4" | 20 | 26.7 | 2.87 | 3.91 | 5.56 |
| 1" | 25 | 33.4 | 3.38 | 4.55 | 6.35 |
| 1-1/4" | 32 | 42.2 | 3.56 | 4.85 | 6.35 |
| 1-1/2" | 40 | 48.3 | 3.68 | 5.08 | 7.14 |
| 2" | 50 | 60.3 | 3.91 | 5.54 | 8.74 |
| 2-1/2" | 65 | 73 | 5.16 | 7.01 | 9.53 |
| 3" | 80 | 88.9 | 5.49 | 7.62 | 11.13 |
| 3-1/2" | 90 | 101.6 | 5.74 | 8.08 | - |
| 4" | 100 | 114.3 | 6.02 | 8.56 | 13.49 |
| 5" | 125 | 141.3 | 6.55 | 9.53 | 15.88 |
| 6" | 150 | 168.3 | 7.11 | 10.97 | 18.26 |
| 8" | 200 | 219.1 | 8.18 | 12.7 | 23.01 |
| 10" | 250 | 273 | 9.27 | 15.09 | 28.58 |
| 12" | 300 | 323.8 | 10.31 | 17.48 | 33.32 |
| 14" | 350 | 355.6 | 11.13 | 19.05 | 35.71 |
| 16" | 400 | 406.4 | 12.7 | 21.44 | 40.19 |
| 18" | 450 | 457.2 | 14.27 | 23.83 | 45.24 |
| 20" | 500 | 508 | 15.09 | 26.19 | 50.01 |
| 22" | 550 | 558.8 | - | 28.58 | 53.98 |
| 24" | 610 | 609.6 | 17.48 | 30.96 | 59.54 |
What is the difference between ERW and smls?
| Characteristic | ERW Pipe | SMLS Pipe |
| Weld Seam | Has a visible longitudinal weld seam. | No seam whatsoever. |
| Cost | Generally more economical. | More expensive. |
| Strength & Pressure Rating | Good strength, but the weld seam can be a slightly weaker point. Suitable for low/medium pressure. | Superior, uniform strength around the entire circumference. Handles higher pressures. |
| Size Availability | Excellent for large diameters (e.g., 24 inches and above) | Primarily available in smaller diameters (typically up to 24 inches). |
| Wall Thickness Consistency | Can have more variation in wall thickness around the circumference. | More consistent wall thickness. |
| Common Applications | Water pipelines, gas distribution, fencing, scaffolding, low-pressure plumbing, structural applications. | Oil & gas drilling (OCTG), refineries, power plant boilers, chemical plants, high-pressure hydraulic systems. |
If your project can use ERW pipe, it will save you money. If the conditions are demanding, SMLS pipe is the necessary, safer, and stronger option.
Contact us for more information regarding ERW and SMLS tubing specifications and product options, or request a quote for further pricing details today.
Which is better, Seamless or ERW pipe?
The choice between seamless pipes and ERW (Electric Resistance Welded) pipes depends on your specific application requirements, budget, and operational environment.
Seamless Pipes Are Best For:
- Extreme Conditions: High-pressure/high-temperature environments (e.g., boilers, steam lines, offshore oil rigs).
- Critical Industries: Oil/gas exploration, petrochemical reactors, and aerospace components where failure risks are unacceptable.
- Structural Use: High-strength columns or shafts requiring uniform strength.
ERW Pipes Are Best For:
- General Construction: Water/gas distribution, scaffolding, fencing, and HVAC ducting.
- Medium-Pressure Systems: Municipal water supply, irrigation, and structural frames.
- Cost-Sensitive Projects: Affordable solutions without compromising basic performance.
If you have any inquiries and questions, Please Contact Youfa Steel Pipe. at any time. Thanks in advance. Welcome!
