LNG Canada First Cargo: A Source-Based Cryogenic Piping Reference

For procurement, the key takeaway is the importance of verifying material traceability and low-temperature impact properties. For example, ASTM A420 WPL6 is a common fitting material for low-temperature service down to -45°C, but for LNG temperatures, buyers may need materials like ASTM A333 Grade 8 or 9% nickel steel. Always confirm the required Charpy impact test temperature with your design engineer.

Procurement Checks for Cryogenic Fittings

When sourcing butt-weld fittings for cryogenic service, consider the following checks:

• Material certification: Require EN 10204 3.1 or 3.2 mill test certificates, ensuring chemical composition and mechanical properties meet the specified grade.
• Impact testing: Verify that Charpy V-notch tests are performed at the design minimum temperature, not just at room temperature.
• Dimensional inspection: Ensure compliance with ASME B16.9 or other applicable standards. Check wall thickness, end bevels, and alignment.
• Surface finish: For cryogenic service, smooth surfaces reduce stress concentrations. Inspect for cracks, pits, or other defects.
• PMI testing: Positive Material Identification (PMI) using XRF or OES helps confirm alloy grades, especially for stainless steels.

RFQ Inputs for Cryogenic Piping Components

When preparing an RFQ for cryogenic pipe fittings, include the following information:

• Design code and edition (e.g., ASME B31.3)
• Service temperature and pressure
• Material grade and specification (e.g., ASTM A403 WP316L)
• Fitting type and size (elbows, tees, reducers, etc.)
• End preparation (bevel per ASME B16.25)
• Testing requirements (hydrostatic, NDT, PMI)
• Documentation requirements (MTCs, inspection reports)

Providing clear RFQ inputs helps suppliers quote accurately and reduces the risk of non-conformances.

Inspection and Documentation Points

For cryogenic fittings, inspection should focus on:

• Dimensional verification against ASME B16.9 or project specifications.
• Visual inspection for surface defects, especially on the inside of fittings.
• Non-destructive testing (NDT) such as radiography (RT) or ultrasonic testing (UT) for critical welds, and penetrant testing (PT) or magnetic particle testing (MT) for surface cracks.
• Hardness testing to ensure material is not over-hardened, which can reduce toughness.
• Review of MTCs to confirm heat numbers, chemical analysis, and mechanical properties.

Common Risks and How to Mitigate Them

• Material substitution: Suppliers may offer equivalent grades that are not truly equivalent. Always require documented evidence of equivalence and approval from the engineer.
• Inadequate impact properties: Fittings may pass room-temperature tests but fail at cryogenic temperatures. Specify impact testing at the minimum design temperature.
• Poor welding quality: Field welds on cryogenic piping require qualified procedures and welders. Ensure WPS/PQR are available and reviewed.
• Delayed documentation: Late MTCs can hold up project closeout. Include documentation deadlines in the purchase order.

How Hebei Haihao Group Can Support Your Piping Needs

While Hebei Haihao Group is not involved in LNG Canada, we offer a wide range of seamless butt-welding pipe fittings and prefabricated piping and installation services. Our products are manufactured to international standards, and we can provide the necessary documentation for your project. For cryogenic applications, we encourage buyers to specify their exact requirements so we can offer suitable solutions.

Conclusion

The LNG Canada first cargo is a reminder of the global scale of LNG infrastructure. For procurement professionals, it underscores the need for rigorous material selection, inspection, and documentation in cryogenic piping systems. By following the checks outlined above, you can mitigate risks and ensure the integrity of your piping components.

Sources

• LNG Canada: a new frontier in global gas supply | Shell Global
• First cargo leaves LNG Canada | Shell Global