Spiral steel pipe itself has no life limit, and the service life is mainly related to the operating environment and production process. Spiral steel pipe operating environment is relatively poor In order to extend the service life, the oute.
STRAIGHT SEAM WELDED PIPE
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| BENDING PIPE | ERW PIPE |
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| ERW PIPE | ERW PIPE |
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20'' LSAW PIPE |
EXPORT PACKING 1 |
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| EXPORT PACKING 2 | HOT EXPANDED STRAIGHT WELDED PIPE |
1.Better than national standards.
2.With excellent quality.
3.For low pressure fluid transfer and mechanical structure etc.
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National Standard |
Enterprise Standard |
Comparison Results |
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Welded Steel Pipe for Transportation of Low Pressure Fluid |
Welded Pipe |
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Outside Diameter of Steel Pipe |
Outside Diameter of Steel Pipe, Tolerance of Outside Diameter |
Better than National Standards |
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Outside Diameter D/mm |
Tolerance of Pipe Outside Diameter |
Tolerance of Pipe End Outside Diameter/mm |
Outside Diameter D
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8" |
±0.60mm |
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D≤48.3 |
±0.5mm |
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5"-6" |
±0.50mm |
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48.3<D≤168.3 |
±1.0% |
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4" |
±0.40mm |
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168.3<D≤508 |
±0.75% |
+2.4 -0.8 |
3"-2½” |
±0.30mm |
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D>508 |
±1.0% |
+3.0 -0.8 |
D≤2” |
±0.20mm |
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Tolerance of Wall Thickness |
±12.5% |
Wall Thickness S |
1.8-5.75mm |
5% |
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Length
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Usual Length |
Tolerance |
Length |
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Better than National Standards |
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D≤2” |
+5-0 |
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4M-12M |
+20-0 |
2½” ≤D≤4” |
+10-5 |
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Multiple length: 5-10mm tolerance for each Multiple length |
+20-0 |
5” ≤D |
+15-0 |
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+20-0 |
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Bending
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≤168.3mm |
Straight for ordinary use or negotiate the bending |
Bending
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≤1.5% |
Better than National Standards |
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>168.3mm |
Smaller than 0.2% of full length of steel pipe |
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Pipe End
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The two end faces of steel pipe should bu vertical with axes of the steel pipe. No burr in the incising |
Pipe End |
The two end faces of steel pipe should be vertical with axes of the steel pipe. No burr in the incising |
Equal to International Standards |
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≥168.3mm |
Cutting tilt: no more than 5mm |
≥168.3mm |
Cutting tilt: no more than 5mm |
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Chemical Composition |
Execute according to GB/T222, GB/T223 and GB/T4336 |
Chemical Composition |
Execute according to GB/T222, GB/T223, GB/T699, GB/T700, GB/T1591 and GB/T4336 |
Better than International Standards |
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Mechanical Properties |
Execute according to GB/T228,GB/T6397, GB/T244 and GB/T246 |
Mechanical Properties |
Execute according to GB/T228, GB/T6397, GB/T244 and GB/T246 |
Equal to International Standards |
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Surface Quality Of Steel Pipe
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Internal and external surface of pipe should bu slick. Folding crack, delamination and lap weld are not permitted. Other defects that no more than the negative deviance of wall thickness are permitted. Internal burr is allowed to exist. Steel pipe with>100mm, could be repaired for its defects and carry out water pressure experiment. |
Surface Quality Of Steel Pipe |
Steel Pipe should not have defects such as crack, scar, folding, delimination, and lap weid etc. Pull line, scoring, weid seam dislocation, scuffing not larger than the negative deviance of wall thickness and the trace of eliminating skin of ferric oxide and burr are allowed. Internal burr is allowed to exist. |
Better than International Standards |
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3 Comments
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