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API Line Pipe

API Line Pipe is manufactured to the highest quality standards at Northwest Pipe Company’s centrally  located Atchison, Kansas facility. Our API Line Pipe is produced on regular rolling schedules ensuring consistent product availability when and where your projects demand.

Additional Information


API 5L 45th Edition PSL 1, API 5L 45th Edition PSL 2, API 5L X42, API 5L X46, API 5L X52, API 5L X56, API 5L X60, API 5L X65, CSA Z245.1, CSA Z359.1 Category I, CSA Z359.1 Category II, Customer Proprietary, Grade B Carbon Steel

Size Range

4.5″ to 16″


20′ to 60′, custom lengths

End Finish

Beveled, End protectors, Per customer specification, Plain end

Hydrostatic Test

Per API 5L specifications CSA or customer request

Non-destructive Testing

Ultrasound on Weld after hydrotest


Rail, Truck


Available throughout North America, Meets “Buy American” requirement

Case Studies

Northwest Pipe Engineering Services

Let Northwest Pipe assist your underground construction project with its engineering requirements. Our professional staff members can
assist with:

  • the design of new products for specialty applications
  • shop drawings
  • engineering submittals
  • coordinating outside sources for specialty fabrications
  • non-destructive testing
  • product recommendations
  • coating and lining recommendations

For more information on our engineering services, please contact us directly: