At the forefront of industrial piping solutions, our extensive range addresses the most demanding large-scale fluid and structural applications. We supply precision-engineered Super Large Bore Stainless Welded Tube for monumental conveyance systems, alongside Ultra Wide Diameter Welded Stainless Pipe built to endure extreme pressure ratings. Our capabilities further extend to Giant Caliber Stainless Steel Welded Tubing for powerhouse infrastructure and Oversize Wide Bore Welded Stainless Tube configurations for custom fabricated assemblies. Each welded product is manufactured under strict ISO and ASME guidelines, utilizing longitudinal or spiral submerged arc welding techniques to guarantee uniform wall thickness, dimensional stability, and superior corrosion resistance across 300-series austenitic and duplex stainless steel grades.
Maximum Size Diameter Welded Stainless Pipe represents the pinnacle of large-diameter stainless steel piping technology, designed for seawater intake lines, petrochemical transfer, structural pilings, and water treatment mega-projects. Produced from hot-rolled plate or coil, the pipe undergoes full penetration welding followed by ultrasonic and radiographic testing to eliminate subsurface defects. The internal weld bead can be controlled to meet specific flow coefficient requirements, while post-weld annealing restores the heat-affected zone to its original metallurgical integrity. Available in extremely long lengths through our specialized rolling and joining processes, this product minimizes on-site girth welds, dramatically accelerating installation schedules and reducing lifecycle costs.
| Parameter | Range |
|---|---|
| Outer Diameter (OD) | 16 inch – 120 inch (406 mm – 3048 mm) |
| Wall Thickness | 0.312 inch – 2.5 inch (7.9 mm – 63.5 mm) |
| Pipe Length | 20 ft – 60 ft standard, single random up to 80 ft upon request |
| Diameter Tolerance | ±0.5% of specified OD or as per customer specification |
| Out-of-Roundness | Within 1% of nominal diameter |
| Feature | Specification |
|---|---|
| Weld Seam Type | Single longitudinal or spiral welded |
| End Finish | Plain end, beveled per ANSI B16.25, or flanged |
| Post-Weld Treatment | Solution annealed and pickled/passivated |
| Non-Destructive Testing | 100% UT of weld seam, optional RT, dye penetrant, PMI |
| Hydrostatic Test Pressure | Calculated per applicable code, typically 1.5 times design pressure |
The Maximum Size Diameter Welded Stainless Pipe program supports custom wall combinations beyond standard schedules, including schedule 5S through double extra heavy. In-house plate rolling and forming presses allow rapid prototyping of unusual diameters without the need for long lead-time tooling. Supplementary services encompass epoxy or fusion-bonded internal coating for tunnel water applications, full-length hydrostatic testing witnessed by third-party inspectors, and detailed mill test reports documenting chemical and mechanical properties per heat number. With logistics expertise for oversized cargo, we coordinate multimodal transport from barge to rail to ensure safe delivery of these massive tubular components directly to your project site.
