Threaded Pipe Fitting Tubing Fittings Welded Weld Elbow

Parameter

Details

Applicable Standards

ASME B16.9 (Buttweld fittings), ASME SB466 / SB467, ASTM B466 / B467, MSS SP-43 (light-wall), BS 6154, DIN 2615, EN 1254-4

Material – UNS C70600 (90/10)

Cu: min 88.6%, Ni: 9.0–11.0%, Fe: 1.0–1.8%, Mn: ≤1.0%, Zn: ≤1.0%, Pb: ≤0.05%, C: ≤0.05%, S: ≤0.03%

Material – UNS C71500 (70/30)

Cu: 68.5–71.5%, Ni: 29.0–33.0%, Fe: 0.4–1.0%, Mn: ≤1.0%, Zn: ≤1.0%, Pb: ≤0.05%, C: ≤0.05%, S: ≤0.03%

Physical Properties (C70600)

Density: 8.94 g/cm³; Melting Point: 1170–1240°C; Thermal Conductivity: 45 W/(m`K) @ 20°C; Electrical Resistivity: 0.19 Ω`mm²/m; Modulus of Elasticity: 135 GPa

Physical Properties (C71500)

Density: 8.94 g/cm³; Melting Point: 1180–1240°C; Thermal Conductivity: 29 W/(m`K) @ 20°C; Electrical Resistivity: 0.39 Ω`mm²/m; Modulus of Elasticity: 150 GPa

Corrosion Data (seawater)

Uniform corrosion rate: 0.025–0.050 mm/year (90/10), <0.025 mm/year (70/30);

Highly resistant to crevice & stress corrosion cracking; Maximum allowable seawater velocity: 3.5 m/s (90/10), 4.5 m/s (70/30)

Size Range

Butt-weld: 1/2" to 48" (DN15 – DN1200); Socket weld & threaded: 1/2" to 4" (DN15 – DN100)

Wall Thickness / Schedules

Sch 5S, 10S, 20, 30, 40S, 40, 60, 80S, 80, 100, 120, 140, 160, XXS (Schedules in accordance with ASME B36.19 for stainless / CuNi)

Type Code

TEE (equal), TEE-R (reducing), TEE-SW (socket weld), TEE-THD (threaded)

End Types

Beveled ends (30–37.5°, root face 1.6 mm ±0.8 mm) per ASME B16.25; Plain ends for socket weld; Threaded ends per ASME B1.20.1 (NPT)

Dimensional Tolerances (ASME B16.9)

• OD (run) : up to NPS 4: ±1.6 mm; NPS 5–8: ±2.4 mm; NPS 10–18: ±3.2 mm; NPS 20–48: ±4.8 mm
• OD (branch) : same as run, plus centering offset: ±1.6 mm (NPS ≤8) / ±3.2 mm (NPS ≥10)
• Wall thickness : min 87.5% of nominal at any point
• Center-to-end (run) : ±1.6 mm (NPS ≤8) / ±3.2 mm (NPS ≥10)
• Center-to-end (branch) : same as run, except for reducing tee branch offsets

Pressure-Temperature Ratings (C70600)

Based on ASME B16.9 pressure design for CuNi:
• 100°F (38°C): Class 150 = 275 psi; Class 300 = 720 psi
• 200°F (93°C): 260 psi (150#), 680 psi (300#)
• 300°F (149°C): 235 psi (150#), 625 psi (300#)
• 400°F (204°C): 195 psi (150#), 515 psi (300#)

Design & Fabrication Features

• Seamless construction up to NPS 12; welded & heat-treated for larger sizes.
• All welded tees are radiographed (optional for seamless).
• Stress relieved after forming when wall reduction exceeds 10%

Inspection & Testing (standard)

• Hydrostatic test : each fitting – test pressure 1.5 x design rating, hold 30 sec minimum.
• Positive Material Identification (PMI) – 100% on all fittings.
• Chemical analysis (per heat).
• Tensile & hardness test (per batch).
• Dimensional check – full report.
• Visual & surface examination (no cracks, laminations, or sharp notches).

Optional NDT / Enhanced Testing

• Radiography (RT) – full circumferential or spot.
• Ultrasonic (UT) – wall thickness verification.
• Dye penetrant (PT) – weld ends and surface.
• Hardness test (HB or HRB).
• Microstructure examination – grain size, phase balance.
• Flattening / expansion test (for pipe stock used).

Marking & Traceability

Permanent low-stress stamping or laser marking: Manufacturer logo, ASTM / UNS grade,

Schedule, NPS, Heat number, Type (TEE), Pressure class. Traceability from melt to final piece – retained for 10+ years.

Surface Finish & Protection

• Pickled & passivated (standard) – removes oxides, leaves a clean passive layer.
• Bare metal – no coating.
• Optional: High-temperature resistant paint (for external only, not for seawater wetted surfaces).
• End caps or plastic plugs to protect bevel/threads during transport.

Certifications

• EN 10204 Type 3.1 – with material certificate and traceability (in-house test).
• EN 10204 Type 3.2 – third-party witness (TÜV, BV, DNV, etc.).
• Type approval available from: DNV, ABS, LR, BV, CCS, RINA, NK, KR.
• NORSOK M-650 – on request (for critical offshore applications).

Packing & Shipping

• Wooden crates or steel pallets.
• Each fitting individually wrapped in rust-preventive paper (though CuNi does not rust).
• Labeling: product code, heat number, quantity, PO number.
• Export seaworthy packing per ISPM 15.

Applications (specific)

• Marine: Seawater cooling, fire main, ballast, bilge, sanitary, hydraulic lines.
• Offshore: Platform deluge systems, riser pipe branches.
• Industrial: Heat exchangers, evaporators, condensers (C71500 preferred for high-velocity).
• Desalination: Multi-stage flash (MSF), reverse osmosis brine lines.
• Power plants: Once-through cooling circuits, auxiliary seawater systems.

Limitations / Warnings

• Not recommended for ammonia or strong oxidizing acids.
• Avoid galvanic contact with graphite, carbon steel, or aluminum in seawater (use isolation kits).
• Maximum design temperature for long-term service: 260°C (500°F).