Unequal Tees

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Unequal Tees

Unequal tees, also known as reducing tees, are three-way glass pipeline fittings in which one or more ports differ in nominal diameter (DN). They are used to branch or combine flows of different sizes within a pipeline while maintaining smooth transitions and controlled flow behavior.

Manufactured from borosilicate glass 3.3, unequal tees provide excellent chemical resistance, thermal stability, and full transparency, making them ideal for laboratory, pilot-scale, and industrial glass piping systems.

Unequal tees are designed with a main run of one DN and a branch of a smaller or larger DN, allowing connection between pipelines of different sizes without the need for separate reducers. This compact design reduces joint count, minimizes pressure losses, and simplifies system layout.

They integrate seamlessly with other pipeline components such as pipe sections, bends, reducers, and crosses, and are suitable for vacuum applications.

Technical Specifications

Typical Catalogue Dimensions (PTU Series)

Sizes and dimensions may vary based on system design and availability.

Applications

Unequal tees are commonly used for:

– Branching a main pipeline into a smaller process line
– Combining streams of different flow capacities
– Connecting auxiliary equipment such as sensors or dosing lines
– Chemical, pharmaceutical, and specialty process plants
– Laboratory and pilot plant glass piping systems

Key Features & Benefits

• Compact design reduces number of fittings
• Smooth flow transition between different DN sizes
• Eliminates need for separate reducers
• High chemical and thermal resistance
• Suitable for vacuum operation
• Full visibility of flow and mixing behavior

Related Pipeline Components

• Equal Tees (PT Series) – same DN on all ports
• Reducers – concentric and eccentric types
• Crosses – four-way flow distribution
• Y-Pieces – angular branching

Customization Options

Unequal tees can be supplied with:

• Custom DN and DN1 combinations
• Modified lengths (L / L1)
• Reinforced wall thickness
• Compatibility with jacketed pipeline systems