China Ductile Iron All Flanged Connection Tee Fitting Manufacturers, Suppliers, Factory
In modern piping networks, the Full Flanged Ductile Iron Tee Pipe Fitting delivers a reliable branch connection where three flanged ends converge. Fabricated from high-grade ductile iron to ASTM A536 Grade 65-45-12, this fitting provides a 90-degree takeoff that simplifies system layout and reduces the need for on-site fabrication. Its all-flanged geometry mates directly with companion flanges under ANSI B16.1 Class 125 or 250 drilling, ensuring a rigid, leak-tight joint. The material’s nodular graphite structure resists fracture under transient surges and exhibits 10% minimum elongation, absorbing thermal and mechanical stresses that would crack gray iron alternatives. Common applications include water transmission mains, fire protection loops, and industrial cooling circuits where long service intervals and swift installation are critical.
The Ductile Iron All Flanged Connection Tee Fitting is produced with an integral raised face on each flange to optimize gasket compression. Internal and external surfaces receive a fusion-bonded epoxy coating with a minimum 8-mil thickness per AWWA C213, providing dielectric insulation and resistance to corrosive soils. The fitting is hydrostatically tested at twice its rated working pressure, and each batch ships with mill test reports documenting chemical composition, tensile properties, and Brinell hardness. Flange boltholes are spot-faced to ensure even torque distribution, and the hubs are reinforced with filet radii that minimize stress concentration at branch junctions. Standard production covers diameters from 3 inches through 48 inches in single-body castings, while larger sizes are fabricated from ductile iron segments with full-penetration welds.
Key Construction Features- Single-piece casting in sizes DN80–DN1200 with wall thickness calculated per AWWA C150 for rated pressure classes
- Flange drilling conforms to ANSI B16.1 Class 125 (125 psi at 23°C) or Class 250 (250 psi at 23°C), with universal bolt circle compatibility
- Ductile iron chemistry delivers minimum 60,000 psi tensile, 42,000 psi yield, and 10% elongation for impact resilience
- Fusion-bonded epoxy lining and coating passes 1,500-hour salt spray testing, suitable for direct bury and submerged service
- Each flange face includes a 0.06-inch raised face machined to 125–250 RMS for positive elastomeric gasket seating
- Standard surface finish is electrostatic-applied RAL 5005 signal blue; optional bituminous, polyurethane, or zinc-rich primers available
| Parameter | Standard Value | Optional / Range |
|---|---|---|
| Nominal Diameter (DN) | 80 – 1200 | 1400 – 2000 (fabricated) |
| Pressure Class | PN10, PN16, PN25 | Class 125, Class 250 (ANSI) |
| Material Grade | ASTM A536 Gr. 65-45-12 | Gr. 60-40-18 for low-temperature service |
| Flange Standard | EN 1092-2, ANSI B16.1 | BS 4504, AS 2129 Table E/D |
| Coating | FBE 250 µm, AWWA C213 | Liquid epoxy 400 µm, galvanized |
| Testing | Hydrostatic 1.5 × PN for 10 seconds | Pneumatic on request |
| Bolt Circle Compatibility | Per flange standard | SS316 or Monel bolt sets supplied |
| Operating Temperature | -20 °F to 150 °F (-29 °C to 66 °C) | Up to 200 °F (93 °C) with EPDM gaskets |
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