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Dimensional tolerance of ERW steel pipe

For standard pipe, except as provided for thin-wall pipe, the tolerances of diameter shall be in accordance with the following table:

Tolerance of outside diameter

Out Diameter Tolerance of Pipe End Tolerance of Pipe Body
219.1-273.1 +1.6mm, -0.4mm ±0.75%
274.0-320 +2.4mm, -0.8mm ±0.75%
323.9-457 +2.4mm, -0.8mm ±0.75%
508 +2.4mm, -0.8mm ±0.75%
559-610 +2.4mm, -0.8mm ±0.75%

Tolerance of wall thickness

Grade Out Diameter Wall Thickness
/ 219.1-457 +15%, -12.5%
B 508-610 +17.5%, -12.5%
X42-X80 508-610 +19.5%, -8%

ERW steel pipes and tube are available in various qualities, wall thicknesses, and diameters of the finished pipes.

Technical requirements For oil and gas transport
For low pressure fluid conveying
Material Gr.b Gr.b
Pipe body diameter
D<508mm, ±0.75%; D≥508mm, ±0.75%
D≤168.3, ±1.0%; 168.3<D≤508,±0.75%;
Wall thickness D<508mm,+15.0%,-12.5%; D≥508mm, +17.5%,-10%
±12.5%
Bending ≤0.2%
≤0.2%
Ovality
D≥508mm,≤±1%
≤±0.75%
Bevel
≤1.59mm
≤5mm
Hydrostatic testing
100%
100%
Nondestructive testing
100% non-destructive weld inspection
Ultrasonic flaw detection is 100%
sunnysteel

Sunny Steel provide a wide range of steel products as Steel pipes, Seamless tube and seamless pipes, Alloy pipes, Pipe fittings, Composite steel pipe used in the industry, construction etc.

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