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Seamless Line Pipe - Image 1
Seamless Line Pipe - Image 2
Seamless Line Pipe - Image 3
Seamless Line Pipe
Seamless Line Pipe - Image 2
Seamless Line Pipe - Image 3

Seamless Line Pipe

Our Seamless Line Pipes are premium tubular sections engineered for the safe and efficient transport of oil, gas, water, mineral slurries, and other fluids. Available in Cold Drawn Seamless (CDS), Hot Finished Seamless (HFS), and Drawn over Mandrel (DOM) configurations, these pipes offer excellent dimensional tolerances and superior weld strength. We supply a comprehensive size range with an Outer Diameter (OD) of 1/8 to 30 inches (10.3 – 762mm) and Wall Thickness (WT) from 0.049″ to 2.5″ (SCH10 – SCHXXS). Our products strictly conform to major international executive standards including API 5L, ASME B36.10, and ASTM A106/A53. Available in various steel grades (GrB, Q345B, X42-X80, PSL1, PSL2) with black line or galvanized finishes to meet the rigorous demands of petroleum, power generation, ship-building, and chemical fertilizer applications.

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Description

1. Product Description

Seamless steel pipe is a tubular section or hollow cylinder, usually but not necessarily of circular cross-section, used mainly to convey substances which can flow — liquids and gases (fluids), slurries, powders and masses of small solids.

Seamless Pipe (and tubing) is made by extruding a steel block or by drilling a solid steel bar. Next, the extrusion or the drilled steel bar is cold drawn through a die to achieve the diameter and thickness needed. Because this process can cause mechanical hardening, sometimes the material is annealed and straightened as a final process.

Seamless Pipe & Tubing is subdivided as:

  • Cold Drawn Seamless (CDS): Exhibits precise tolerances and a good surface finish.
  • Hot Finished Seamless (HFS): Has less critical tolerances and a somewhat scaly finish and is not as strong as CDS.
  • Drawn over Mandrel (DOM): The first stages of manufacturing are identical to ones used to make electric resistance welded tubing, but in the finishing stages the entire flash weld is taken out and the tube is cold drawn over a mandrel. A mandrel is a round object against which material can be forged or shaped. The cold drawn process provides the tube with better dimensional tolerances, improved surface finish and the strongest weld strength achievable.

2. Application & Standards

  • Type: Oil-conveying pipe; Gas conveying pipe; Water conveying pipe; Sewage pipe.
  • Application: Oil, Gas, Water, Mineral slurry, and other fluids. API seamless pipes are widely used for petroleum, power generation, natural gas, coal gas, water and some solid materials, also ship-building, chemical fertilizer equipment etc.
  • Executive Standards: API5L, ASME B36.10, ASTM A106/A53.
  • Standard & Grade: A192, A335, ST52, S355, A334, Q235, G3454, A179, Q235b, Q345e, ST 45, SA106b, A519, EN10210, A56, A790, S275, C45, ST35, A160, A106b, X42, X52, X56, X60, X65, X70, PSL1, PSL2, API5L.GRA, B, C.
  • Materials: GrB, Q345B, X42-70, ST44, ST52 etc.
  • Testing: Eddy current / Hydrostatic / Ultrasonic / Intergranular Corrosion etc.

3. Specification Range

OD: 1/8 – 30 inch (10.3 – 762mm) | WT: 0.049″ – 2.5″ (1.24 – 63.5mm) | Schedule: SCH10 – SCHXXS

OD/mm WT / mm (3 to 40)
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
21.3 √ √ √ √ √
26.7 / 33.4 √ √ √ √ √ √
48.3 / 60.3 √ √ √ √ √ √ √ √
73 √ √ √ √ √ √ √ √ √ √
88.9 √ √ √ √ √ √ √ √ √ √ √
114.3 √ √ √ √ √ √ √ √ √ √ √ √
168.3 √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √
219.1 √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √
273.1 √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √
323.3 / 355.6 √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √
406.4 / 457.2 / 508 √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √
609.6 / 660.4 √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √
711.2 / 762 √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √

4. Manufacturing Process

Production technology: Hot-rolled and cold drawn.

For its different manufacturing process, there are hot rolling steel tube and cold drawn seamless steel tube. We sell seamless line pipe available in different sizes, weights, and grades. Customers can choose from black line pipe and galvanized line pipe from 1/8″ up to 30″, steel grade A, B, X42 – X80.

Welded line pipe (also available) for intra-field is used to transport crude oil and natural gas from the field to oil refineries and storage facilities, as well as to shipment points and distribution nodes.

Diagram of seamless line pipe manufacturing process for oil and gas pipelines.

5. Packing & Delivery

  • Protection: Plastic caps plugged at the two sides of pipe ends.
  • Handling: Should be avoided by the steel strapping and transport damage.
  • Bundling Requirements:
    • Package of carbon steel seamless pipe in bundles, seaworthy packing, or as required by customers.
    • Bundled signs should be uniform and consistent.
    • The same bundle (batch) of steel pipe should be came from the same furnace.
    • The steel pipe in a bundle has the same furnace number, the same steel grade, and the same specifications.
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