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API 5L X42 Large Diameter Spiral Welded Pipe

Release Tme: 2026-03-13
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What is API 5L X42? Understanding the Grade

API 5L X42 (equivalent to ISO 3183 L290) is a medium-grade carbon steel pipe designed for the transport of oil, gas, and water.

  • Yield Strength: Minimum 42,100 psi (290 MPa).

  • Tensile Strength: Minimum 60,200 psi (415 MPa).

 

Technical Specifications: PSL1 vs. PSL2

Feature PSL 1 (Standard) PSL 2 (High Performance)
Mandatory Testing Hydrostatic, Tensile, Bending All PSL1 + CVN (Impact), DWT
Traceability Basic Full Traceability from Melt to Finish
Weld Inspection Standard NDT Strict NDT with 100% X-Ray/UT
Application Water/Low-pressure Gas High-pressure Gas / Critical Infrastructure
 

Dimensions and Manufacturing Range

  • Outer Diameter (OD): 219mm – 3048mm (8" to 120")

  • Wall Thickness (WT): 5.0mm – 25.4mm

  • Length: 6m – 12m (Customized lengths up to 35m available)

  • End Finish: Beveled ends (30°/35°) for on-site welding or plain ends.

 

Coating & Corrosion Protection

  • External: 3PE (Three-Layer Polyethylene), FBE (Fusion Bonded Epoxy), or Coal Tar Epoxy.

  • Internal: Liquid Epoxy (conforming to AWWA C210 for potable water) or Cement Mortar Lining.

  • Surface Standard: Compliant with DIN 30670, CAN/CSA Z245, and ISO 21809.

 

Quality Assurance: Zero-Defect Delivery

  • 100% Hydrostatic Test: Every pipe is tested under pressure to ensure zero leakage.

  • Real-time X-Ray & UT: Online ultrasonic testing and final X-ray inspection of weld seams to identify any internal defects.

  • Dimensional Precision: Strict control over out-of-roundness and pipe-end diameter to ensure seamless field welding.

  • Third-Party Inspection: We welcome SGS, BV, Lloyd's, and ABS for on-site witness and 3.2 Certificate issuance.

 

Logistics & Cost Savings: The Nesting Solution

  • Nesting (Pipe-in-Pipe): We can nest smaller diameter pipes (e.g., 600mm) inside larger ones (e.g., 1200mm). This maximizes shipping space and can save you up to 35% on freight.

  • End Protection: Heavy-duty steel or plastic caps prevent bevel damage during transit.

  • Professional Loading: We provide detailed lashing and loading plans for both Bulk Carriers and Container shipping.

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