The safe transportation of liquid ammonia (NH₃)-a highly corrosive, toxic, and volatile chemical-requires pipelines with exceptional corrosion resistance, mechanical strength, and weldability. ASTM A312 TP316L stainless steel pipe has emerged as the preferred material for both subsea ammonia pipelines and onshore ammonia distribution systems, thanks to its outstanding material properties and compatibility with ammonia-rich environments.
In the field of liquid ammonia transportation, TP316L marine-grade steel pipe contains 2–3% molybdenum, which significantly enhances resistance to pitting and crevice corrosion, especially in chloride-rich and harsh environments. Its low carbon content (≤0.035%) effectively eliminates the risk of intergranular corrosion after welding from the source. This characteristic is crucial for the long-term safety of liquid ammonia transport systems.
Practical operating condition tests have confirmed that TP316L shows no stress corrosion cracking (SCC) under normal service conditions, ensuring reliable performance. Meeting the stringent requirements of subsea and coastal facilities, TP316L steel pipes offer excellent saltwater corrosion resistance and high pressure tolerance. They can extend service life in deepwater environments without the need for additional protective coatings, reducing maintenance costs while ensuring stability and safety of liquid ammonia transportation in complex geographic conditions.
| Parameter | Specification |
|---|---|
| Standard | ASTM A312 / ASME SA312 |
| Grade | TP316L (UNS S31603) |
| Dimensions | OD: 1/2" – 24", Wall Thickness: SCH10 to SCH80 |
| Pipe Type | Seamless / Welded |
| Surface Finish | Pickled / Bright Annealed / Polished |
| NDT Testing | 100% Eddy Current / Hydrostatic / Ultrasonic |
| Certification | EN 10204 3.1 / NACE MR0175 / PED |
| Packaging | End capped, PE-wrapped, seaworthy wooden crates |
For offshore ammonia production platforms, FPSO offloading arms, and undersea ammonia transport networks.
From ammonia storage terminals to fertilizer plants, chemical processing units, and cryogenic tank farms.
Used in selective catalytic reduction (SCR) systems in refineries and marine NOx control.
TP316L is easy to weld with TIG/MIG processes, and post-weld cleaning is simplified.
No need for post-weld heat treatment (PWHT), reducing downtime and fabrication costs.
Welded joints retain full corrosion resistance, which is vital in continuous ammonia pipelines.
Strict compliance with ASTM A312 & NACE standards
Custom lengths, wall thicknesses, and surface treatments
Third-party inspection: SGS, BV, ABS available
Global delivery with full traceability and MTC (EN 10204 3.1)
Special requirements: Corrosion-resistant, smooth internal surface (Standard absolute roughness value = 0,000015 meters)
Contact Us
Looking for reliable, corrosion-resistant stainless steel pipe for your ammonia pipeline project? Contact GNEE today for a technical consultation and quotation.
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