Select Page

API Seal 9100 Dual Series


For applications requiring enhanced environmental and safety protection, the 9100 series is available as dual seals capable of working in either an unpressurized buffer environment or a pressurized barrier fluid system.

The Thomson 9000 series pusher seals are all stationary flexible elements 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.


Download Datasheet

Application Form


  • Robust faces resistant to deflection at high pressures and temperatures.
  • Very Low Emission tandem design.
  • Flow inducer per API plan 52.
  • Low friction face geometry.
  • Can apply quench.
  • Compact construction for easy retrofit to smaller pumps.
  • No Spark carbon throttle bushing to restrict process flow to atmosphere.
  • Self aligning design on both primary and secondary faces.


  • Clean, Low density high pressure hydrocarbons
  • Propane-butane, Ethanol, Acetone, ethylene hydrocarbons
  • Oil Refining
  • Chemical
  • Operates with API 682 plan: 11/52, 11/53, 12/52, 12/53,  53a,b,c & 54 piping plans
  • Designed according to API 682 Type A, category 2 or 3, arrangement 2CW-CW or 3CW-FB.

Operating Range

Temperature/Pressure Max:

  • -40 to 175°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