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TAC 33 Cartridge Seal


The TAC-33 is a full cartridge design. It is a single stationary multi-spring seal with a four-bolt stuffing box arrangement. The TAC-33 has flush, quench, and drain ports. The TAC-33 utilizes tangential flush ports in combination with a pumping ring to increase the flow of flush media through the seal. Two tangential flush ports are machined into the seal for both directions of rotation. These two key features increase the effectiveness of the flush and helps lower the heat generated by the faces.


Thomson Adaptive Cartridge Thermal Management Technology

The TAC-33 is also equipped with a restriction bushing to restrict the flow of media in case of seal failure. All of AR Thomson Groups’ ANSI mechanical seals are balanced seals and feature monolithic faces, thermal management technology, and stationary spring designs. Monolithic faces have proven to be more resistant to distortion from higher temperature or pressure applications. The thermal management technology removes heat from the faces and distributes it to other areas of the seal and stuffing box. This removal of the heat allows for some intermittent flow of liquid between the faces (dry running). Stationary spring designs are self-aligning and allow for some alignment issues and improper installation.


The TAC-33 design is excellent for process pumps, clean to light slurry, water/wastewater, pulp & paper, and irrigation systems. It is available in many different metallurgies, elastomers, and face combinations to meet the specifications of your application.


Cartridge Seal Specifications

Retrofits virtually all pumps such as: Goulds, Durco, Bingham, Sulzer, Ahlstrom, Worthington, Nash, Hayward-Gordon, Moyno, Wemco, Canada Pump, Viking, Weir, Cornell, A-C, Taco, IDP, etc.


The TAC-33 has a maximum pressure rating of 300 psig (21 bar), a temperature range of -40°F to 400°F (-40°C to 204°C), and a maximum shaft speed of 5000 fpm (25 m/s).


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Application Form



  • Monolithic faces resistant to distortion at higher temperatures/pressures.
  • Flexible, self-aligning stationary.
  • Heat conduction ring.
  • Quench and Drain ports to clean and cool faces.
  • Preassembled Cartridge design.


  • General Service
  • Process Pumps
  • Clean to Light slurry
  • Water/Wastewater
  • Irrigation
  • Food and Beveridge
  • Pulp and Paper

Operating Range

  • Pressure Max: 300psig (21 bar)
  • Temperature Range: -40F-400F (-40C-204C)
  • Max Speed: 5000 fpm (25 m/s)

Standard Materials

  • Seal Faces : TC, Carbon, Silicon Carbide.
  • O-Rings : FKM, EPDM, Nitrile, Aflas, FFKM.
  • Springs: Hastelloy C
  • Metallurgy*: 316SS

* Hastelloy C, Alloy 20 and Titanium available upon request.