Line Pipe

Line Pipe for Gas, Oil, and Water Pipelines

UNIASEN offers line pipe in a wide range of size, length, diameters and steel grade. Products can be used to transport oil, gas, petroleum, and water. Our line pipes are strictly made in accordance with the product specification (API 5L) set by the that were developed by the American Petroleum Institute.
UNIASEN offers ERW line pipe in a wide range of size, length, diameters and steel grade. Products can be used to transport oil, gas, petroleum, and water. Our line pipes are strictly made in accordance with the product specification (API 5L) set by the that were developed by the American Petroleum Institute.

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Size Chart

Nominal Pipe Size (NPS)Outside DiameterNominal Wall Thickness
DNInchmmSCH5SSCH10SSCH10SCH20SCH30SCH40SCH60SCH80SCH100SCH120SCH140SCH160STDXSXXS
61/8″10.31.241.732.421.732.41
81/4″13.71.652.243.022.243.02
103/8″17.11.652.313.22.313.2
151/2″21.31.652.112.773.734.782.773.737.47
203/4″26.71.652.112.873.915.562.873.917.82
251″33.41.652.773.384.556.353.384.559.09
321 1/4″42.21.652.773.564.856.353.584.859.7
401 1/2″48.31.652.773.685.057.143.685.0810.15
502″60.31.652.773.915.548.743.915.5411.07
652 1/2″732.113.055.167.019.535.167.0114.02
803″88.92.113.055.497.6211.135.497.5215.24
903 1/2″101.62.113.055.748.085.748.08
1004″114.32.113.056.028.5811.1313.496.028.5617.12
1255″141.32.773.46.559.5312.715.886.559.5318.05
1506″168.32.773.47.1110.9714.2718.267.1110.9721.95
2008″219.12.773.766.357.048.1810.3112.715.0918.2620.6223.018.1812.722.23
25010″273.13.44.196.357.89.2712.715.0918.2621.4425.428.589.2712.725.4
30012″323.93.964.576.358.3810.3114.2717.4821.4425.428.5833.329.5312.725.4
35014″355.53.964.786.357.929.5311.1315.0919.0523.8327.7931.7535.719.5312.7
40016″406.44.194.786.357.929.5312.716.6621.4426.1930.9636.5340.499.5312.7
45018″457.24.194.786.357.9211.1314.2719.0523.8329.3634.9339.6745.249.5312.7
50020″5084.785.546.359.5312.715.0920.6226.1932.5438.144.4550.019.5312.7
55022″558.84.785.546.359.5312.722.2328.5834.9341.2847.6353.989.5312.7
60024″609.65.546.356.359.5314.2717.4824.6130.9638.8946.0252.3759.549.5312.7

Quality Control

Supplier Management

UNIASEN conducts rigorous audits of our raw material suppliers to check their production qualifications and capabilities to ensure that their quality control procedures  comply with our QC regulations.

Pre-Production

Once the raw materials are received, UNIASEN will send an inspector for a visual inspection to prevent any defects, such as crack, pit and blowhole on the coils. Other than Visual inspection, our inspection will also cut a test sample from the coil to analysis the chemical composition, and compare the result with material test certificate (MTC) and the Standard Specification.

During Production

In order to ensure the pipes are qualify to the standard, our engineers, onsite inspector and the front-line workers need to make a lot of efforts. During the production stage, the following tests and inspections will be done:

  • Tensile Test
  • Bending Test
  • Metallographic Test
  • Charpy V-Notch Impact Test
  • Spectrographic Test
  • Drop Weight Tear Test (DWTT)
  • Flattening Test
  • Hydrostatic Test
  • Ultrasonic Test (NDT)

Varnishing, Marking and Packaging

After Pipe Production, the pipes will be varnished as per customers’ request to prevent from rust and corrosion. UNIASEN sticks a bar code Inside the pipe body, and the bar code tells the heat number, pipe number, and production information. Then, by scanning the bar code, we will mark each pipe on the pipe body in accordance with the production standard to ensure the traceability.

Packaging is a critical step to prevent the pipes from any damage during transportation, so UNIASEN also pays close attention on this stage. According to the product size, coating, processing type and customer requirement, UNIASEN normally uses end protector, PVC Wraps, Nylon Slings, Galvanized Straps, and Fumigated Woods to protect the pipes. If any specific requirement has been asked, our engineers will do a packaging design to provide a suitable solution.

Pre-Shipping

Before shipping the pipes to our clients, our inspector will do the final check to ensure our customers will receive the correct products that they ordered, especially the visual look, packaging, marking, and varnishing. Then, the QC department will also issue the material test certificate (MTC) accordingly for each delivery batch.

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