Reducing Tees - Pumps, Valves, Piping and Fittings

Reducing tees are branch pipe fittings with a smaller outlet than the run, used to create a reduced-size branch connection in marine piping systems. They are manufactured in butt-weld, socket-weld, threaded, flanged, or grooved configurations.

ProShipWorks provides end-to-end support to source and supply Reducing Tees for marine vessels, ship operators, industrial facilities, maintenance teams and procurement departments.

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Product Information

Product Name Reducing Tees
Product Category Pumps, Valves, Piping and Fittings
Product Reference 621
Brands / Manufacturers Bonney Forge, GF Piping Systems, Victaulic
Unit of Measure Piece

Key Features

Key Feature
1.   Reduced branch outlet size
2.   Available in carbon steel, stainless steel, alloy steel, copper alloys, and plastics
3.   Suitable for welded, threaded, flanged, or grooved piping systems
4.   Available in seamless and fabricated constructions
5.   Supports fluid, cooling, ballast, fuel, fire-main, and utility piping

Applications of Reducing Tees

Application
1.  Marine seawater cooling and ballast systems
2.  Fuel oil, lubricating oil, and compressed-air piping
3.  Fire-main, bilge, deck-wash, and general service systems

Models & Manufacturers

Model Manufacturer
Butt-Weld Reducing Tee Bonney Forge
Socket-Weld Reducing Tee Bonney Forge
Threaded Reducing Tee Bonney Forge
Grooved Reducing Tee Victaulic

Technical Specifications

Model Specification Value Unit
Butt-Weld Reducing Tee Dimensional standard ASME B16.9 —
Forged Socket-Weld or Threaded Reducing Tee Dimensional standard ASME B16.11 —
Butt-Weld Reducing Tee Typical materials Carbon steel, stainless steel, alloy steel —
Socket-Weld or Threaded Reducing Tee Typical pressure classes 2000, 3000, or 6000 psi
Grooved Reducing Tee Connection standard Manufacturer-specific grooved coupling system —

Standards, Certifications & Class Approval

Review the available standards and approval information relevant to the product. Actual certification, material traceability, inspection and classification requirements depend on the product type, intended application and purchasing specification.

Applicable Standards & Certification Common standards include ASME B16.9 for factory-made butt-weld fittings, ASME B16.11 for forged socket-weld and threaded fittings, ASME B16.25 for weld ends, ASTM material standards, and MSS SP-97 where applicable. Marine approval depends on material, pressure, service, and installation.
Class Approval DNV, ABS, Lloyd's Register, Bureau Veritas, and ClassNK may accept or approve piping fittings subject to the vessel rules, material certificates, pressure rating, traceability, and approved piping-system design. Approval is not automatic for every product.

Installation, Maintenance & Safety Information

Installation Notes Verify nominal sizes, wall thickness, material compatibility, pressure rating, and connection type before installation. Align the run and branch correctly, remove internal debris, and use qualified welding procedures or approved threaded, grooved, or flanged assembly methods.
Maintenance Tips Inspect periodically for corrosion, leakage, vibration damage, coating failure, and distortion. Check nearby supports and clamps, especially on seawater and high-temperature systems. Replace fittings showing cracks, severe wall loss, or damaged threads.
Safety Notes Isolate, depressurize, drain, and ventilate the piping system before removal or installation. Follow hot-work, confined-space, and welding procedures. Confirm compatibility with hazardous fluids and never exceed the fitting's rated pressure or temperature.

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