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Home – Seamless Steel Pipe – Seamless vs Welded Decision Helper Seamless vs Welded Decision Helper Place your application against the ASME B31.3 joint-factor threshold — honestly. 1. Service / medium Water, air, steam, structural, standard distribution Sour (HIC), lethal or cyclic high-pressure service Corrosive / chemical / marine High-temperature creep or cryogenic 2. Design pressure Low to mediumHigh pressure (E=1.00 mandated by code) 3. Nominal size (NPS) NPS 2 or belowAbove NPS 2Very large OD (above ~24″ / 610 mm) Get my recommendation Request a free suitability check →