Full Flanged Ductile Iron Tee Pipe Fitting

The robust design of the Ductile Iron All Flanged Connection Tee Fitting makes it a cornerstone in municipal water mains, fire protection systems, and industrial process piping. Fabricated from ASTM A536 Grade 65-45-12 ductile iron, this full flanged tee fitting offers a minimum tensile strength of 65 ksi and yield strength of 45 ksi, absorbing impact and resisting crack propagation far better than traditional grey cast iron. The flanged ends are precision machined to ANSI B16.1 Class 125 and Class 250 bolt patterns, with either flat face or raised face profiles that accommodate ring‑type and full‑face gaskets for a dependable metal‑to‑metal seal. Each unit undergoes a hydrostatic shell test at a minimum of twice the rated pressure before leaving the foundry, confirming zero leakage and dimensional accuracy. The integral flanges eliminate the need for separate flange adapters, which reduces the total joint count, lowers material inventory, and streamlines on‑site assembly. Engineers value the tee’s generous corrosion allowance and thick wall sections that routinely exceed cast iron specifications by 15–30%, delivering an extra margin of safety in buried and above‑ground installations. NSF 61 certification ensures the fitting is safe for potable water contact, while its spheroidal graphite microstructure provides inherent dampening that attenuates water hammer and vibration throughout the piping network. Standard laying lengths and uniform bolt‑hole orientation speed up installation, whether the tee is connecting to gate valves, butterfly valves, or flanged spools in a pump station manifold.

A Full Flanged Ductile Iron Tee Pipe Fitting is engineered for a minimum 100‑year service life when specified with proper internal and external protection. The interior is lined with centrifugally applied cement mortar conforming to AWWA C104, which creates a high‑pH passivating layer that halts tuberculation and preserves full bore flow capacity. This lining maintains a Hazen‑Williams C factor near 140, minimizing pumping energy costs over decades. On the outside, the fitting receives a fusion‑bonded epoxy coating per AWWA C105 after abrasive blasting to SSPC‑SP 10 white metal, forming a barrier that resists soil stress, cathodic disbondment, and chemical attack in burial conditions ranging from dry sand to saturated clay. For harsh environments—such as marine exposure or acidic backfill—alternate coatings including liquid epoxy, polyurethane, or hot‑dipped zinc with a bituminous topcoat can be ordered. The tee is available in equal and reducing patterns from 3×3×3 inches up to 64×64×64 inches, with Class 125 and Class 250 drilling to match adjacent flanges. Gasket seating surfaces feature a serrated phonographic finish that optimizes compression sealing, and factory‑applied anti‑seize lubricant on threads simplifies torqueing. The consistent laying lengths, held to a tolerance of ±0.06 inch per flange face, allow precise spool‑piece prefabrication and reduce field rework.

• Body: Ductile iron ASTM A536 Gr. 65‑45‑12
• Tensile strength: ≥ 65,000 psi
• Yield strength: ≥ 45,000 psi
• Elongation: ≥ 12% in 2 inches
• Hardness: ≤ 250 BHN

• Type: Full flanged, integral cast ends
• Face: Flat face or raised face (specify)
• Drilling: ANSI B16.1 Class 125 / Class 250
• Bolt circle & number of bolts: per ASME/ANSI standard

• Internal lining: Cement mortar per AWWA C104 (standard thickness 1/16″–1/8″)
• External coating: Fusion‑bonded epoxy per AWWA C105 (minimum 10 mils DFT)
• Optional: Liquid epoxy, polyurethane, hot‑dipped zinc + bituminous paint

• AWWA C110 / C153 – Compact and full‑body tees
• ANSI/NSF 61 – Certified for drinking water
• ANSI/NSF 372 – Low‑lead compliance
• ISO 9001 and ISO 14001 manufacturing