Overview
Custom lined tees are specialized pipe fittings featuring a metal exterior (typically carbon or stainless steel) with an internally bonded plastic lining, commonly made of PTFE, PP, or PVC. These hybrid fittings address the dual requirements of mechanical strength and chemical resistance in industrial piping systems. The lining process involves thermally or adhesively bonding the plastic layer to the metal substrate, creating a seamless barrier against corrosive media while maintaining the structural integrity needed for high-pressure applications. Manufacturers offer customization in bore sizes (typically DN15-DN500), pressure classes (PN10-PN40), and lining thicknesses (usually 2-5mm) to match specific process requirements.
Structure and Working Principle
The tee's construction comprises three main components: the metal outer shell providing structural support, the inner plastic liner preventing fluid contact with metal, and the flanged or threaded connection ends. The lining extends through all branches, ensuring full fluid containment. During operation, the metal body withstands system pressures and mechanical stresses, while the plastic liner chemically isolates transported fluids. Advanced manufacturing techniques like rotational lining or isostatic molding ensure uniform lining thickness even in complex tee geometries, preventing weak points where corrosion could initiate.
Key Features
Chemical resistance varies by liner material: PTFE handles aggressive acids/bases up to 260°C, PP suits moderate chemicals up to 100°C, while PVC is cost-effective for weaker corrosives. All variants demonstrate excellent dielectric properties, preventing galvanic corrosion. These fittings feature zero-leak designs with reinforced transition zones between branches. Optional electro-polished interiors (for stainless steel bodies) enhance cleanliness in hygienic applications. Pressure ratings typically range from 10 to 40 bar, with customized reinforcements available for higher demands.
Application Areas
Primary applications include chemical processing plants for acid/alkali transfer, pharmaceutical CIP/SIP systems requiring sterility, and food processing lines where product purity is critical. They're also specified in water treatment for handling disinfectants like chlorine dioxide. In offshore oil/gas platforms, lined tees manage corrosive produced fluids. Semiconductor fabs use ultra-clean versions for high-purity chemical distribution. The fittings are increasingly adopted in mining for slurry transport systems where both abrasion and corrosion resistance are required.
Maintenance and Precautions
Regular inspections should check for liner delamination (via ultrasonic testing) and connection integrity. Avoid mechanical impact during installation that could crack linings, and use proper gaskets compatible with both flange materials and process fluids. Temperature cycling beyond the liner's expansion coefficient can cause bonding failure. Always follow the manufacturer's thermal shock limits (typically <10°C/minute change). For cleaning, use methods compatible with both metal and liner - avoid abrasive blasting on lined surfaces.
B2B Procurement Guide
When sourcing custom lined tees, provide complete specifications: fluid composition (including trace components), operating temperature/pressure ranges, flow velocity, and required certifications (e.g., ASME B16.5, ISO 9001). Lead times vary from 4-12 weeks depending on customization complexity. Reputable manufacturers should provide material certificates, hydrostatic test reports, and lining thickness maps. Consider suppliers offering value-added services like 3D modeling for complex piping layouts or on-site flange facing to ensure perfect fitment.
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