Inquiry Form





API Standard 682 seal

Mechanical seals for pumps
Pusher seals

  • Outer seal which can be used for flashing as well as non-flashing applications prevents hazardous emissions in case of inboard seal failure
  • Low heat generation and power consumption due to narrow seal face width of inner seal
  • Longer seal life
  • Pressure-balanced design prevents mating ring being forced out under reverse pressure
  • No damage to shaft sleeve as dynamic O-Ring is not in direct contact with the sleeve


Mechanical seals for pumps
Pusher seals
  • API 682 Category 2 and 3, Type A, Arrangement 2 seal
  • Dual seal in face-to-back arrangement
  • Dry contact outer seal (containment seal)
  • Balanced
  • Cartridge unit
  • Solid seal faces

Product specification example

Standards and approvals

API 682 / ISO 21049


Seal ring (primary seal): Blister resistant carbon, Silicon carbide SSiC (Q1), RBSiC (Q2)

Seal ring (secondary seal): Special carbon

Mating ring: Silicon carbide SSiC (Q1), RBSiC (Q2)

Secondary seals: FKM (V), FFKM (K), EPDM (E), NBR (P)

Springs: Hastelloy® C-276 (M5)

Metal parts: CrNiMo steel 316 (G)

Operating range

Pressure (primary Seal): p = vacuum … 42 bar (… 609 PSI)

Pressure (secondary seal): p = 2.75 bar (40 PSI) normal operation, max. 60 bar (870 PSI) in wet operation

Temperature: -40 °C … +176 °C (-40 °F … +349 °F)*

Sliding velocity: … 23 m/s (… 75 ft/s)

Viscosity: … 300 mPas

Solids content: … 0.5 wt.%

* Engineered up to 260 °C (500 °F) with FFKM (K) secondary seals

Recommended applications

Refining technology

Oil and gas industry

Petrochemical industry

Chemical industry

Power plant technology

Light volatile hydrocarbons

LPG plants API 610 / ISO 13709 pumps

Process pumps

Recommended piping plans

Process side: 02, 11, 12, 13, 14, 21, 22, 23, 31, 32, 41

Between seals: 71, 72, 75, 76

Applicable ranges shown in the product introduction are limit values for each standard material.
Applicable ranges, performance data and figures can serve only as a guide for selection and therefore in actual use there will be some cases where general specifications cannot be applied due to unknown factors or constraints.
Please check the applicability before use.
The contents are subject to change without notice for improvement.


This website uses cookies to improve your online experience. By continuing to use this website, we will assume that you are agreeing to our use of cookies. For more information about cookies, please visit our " Use of cookies" at Privacy Policy.