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API Seal 9100 Series


Designed to operate in applications where the process media is close to vapour pressure the API Seals 9100 Series all feature flexible stationary technology and can be supplied in single, wet dual, contacting and non-contacting secondary containment configurations.

The Thomson 9000 series pusher API Seals are all stationary flexible element as standard.


According to API 682 4th Edition

“Perpendicularity of the mating ring to the shaft axis is important for both stationary and rotating flexible element designs. “

“Perpendicularity for a rotating mating ring mounted on the sleeve (where a stationary flexible element is used) is controlled by the seal sleeve run out and perpendicularity of support surface on the sleeve. It is independent of the seal chamber face run out. An advantage of a stationary flexible element is that it will deflect to a fixed position to align with the rotating face. “

This fundamentally means that whilst the current standard views rotating and flexible element seals as the same. A design using a flexible stationary element has some benefits over flexible rotary designs that can not be dismissed


API Seals and Suspended Solids:

Seals using a stationary flexible element with springs external to the process liquid are also a proven design in process fluids with high particulate concentrations.

Stationary flexible elements are preferred in many oil and gas applications such as:

  • High-temperature pumps
  • Multi-stage pumps
  • Pump installations with high pipe strain
  • High-speed applications
  • Shaft diameters above 4.25”

It is important to note that the advantages of the flexible stationary face would apply even in applications that are not as demanding as those noted above. Flexible stationary faces should be considered the preferred option in almost all applications.


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Application Form


  • Robust faces resistant to deflection at high pressures and temperatures.
  • Very Low Emission design.
  • Low friction face geometry.
  • Compact construction for easy retrofit to most pumps.
  • No Spark carbon throttle bushing to restrict process flow to atmosphere.
  • Self-aligning design for greater fluid film stability.


  • Clean, Low-density high pressure hydrocarbons 
  • Propane-butane, Ethanol, Acetone, ethylene hydrocarbons.
  • Oil Refining
  • Chemical
  • Operates with API 682 plan: 11, 12, 13, 21, 32 & 64 piping plans.
  • Designed according to API 682 Type A, category 2 or 3, arrangement 1, configuration 1CW-FL (with floating carbon restriction bushing).

Operating Range

Temperature/Pressure Max:

  • -40 to 176°F @ 450 to 510 psi
  • -176 to 265°F @ 400 to 450 psi
  • -265 to 350°F @ 320 to 400 psi
  • -350 to 482°F up to 320 psi

Standard Materials

Metal Parts: 316SS or Hastelloy C
Seal Faces: Antimony Impregnated Carbon
Graphite, Silicon Carbide, Tungsten Carbide
Elastomers: FKM, EPDM, FFKM
Springs: Hastelloy C