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API Standard 682 seal

Mechanical seals for pumps
Pusher seals
  • Non-contacting stationary spring unit design
  • No process fluid penetration into the seal faces, no leakage to the atmospheric side
  • Appropriate to slurry fluid
  • Applicable inboard seal design for reverse and positive pressure
  • Low power consumption


  • API 682 Category 2 and 3, Type A, Arrangement 3 seal
  • Dual seal in face-to-back arrangement
  • Gas-lubricated
  • Balanced
  • Cartridge unit
  • Stationary multiple springs
  • Independent of direction of rotation
  • Solid seal faces

Product specification example

Standards and approvals

API 682 / ISO 21049


Seal ring: Silicon carbide SSiC (Q1), High density carbon graphite

Mating ring: Silicon carbide SSiC (Q1)

Secondary seals: FKM (V)

Springs: Hastelloy® C-276 (M5)

Metal parts: CrNiMo steel 316 (G)

Operating range

Pressure: p = vacuum … 16 bar (232 PSI)

Temperature: t = -40 °C … 160 °C (-40 °F … 320 °F)

Sliding velocity: vg = 23 m/s (75 tf/s)

Viscosity: … 300 mPa·s

Solids content: … 20 wt.%

Recommended applications

Chemical industry

Refining technology

Hazardous media


Recommended piping plans

Process side: 02, 32

Between seals: 74

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.


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