ERW pipes means Electric Resistance Welded Pipes. ERW steel pipes and tubes are used. ERW steel pipes and tubes are used in various engineering purposes, fencing, scaffolding, line pipes etc.
Dimensional tolerance of erw pipes:
Tolerance of outside diameter
Standard Out Diameter Tolerance of Pipe End Tolerance of Pipe Body API 5L 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 Standard Grade Out Diameter Wall ThicknessAPI 5L / 219.1-457 +15%, -12.5% B 508-610 +17.5%, -12.5% X42-X80 508-610 +19.5%, -8%
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