19-08 WHERE TO SPECIFY DUAL (TWO) SEALS IN AN APPLICATION

  • To prevent a costly product from leaking to the atmosphere..
  • To prevent a dangerous product from leaking to the atmosphere.
  • To prevent a pollutant or fugitive emission from escaping to the atmosphere.
  • To prevent damage to the pump, base-plate, and surrounding area when the mechanical seal fails, as well as the clean up cost involved.
  • To contain a vacuum if a rotating shaft is running through the vessel.
  • As a back up seal to prevent costly down time when the first seal wears out or fails. This is an important element in any predictive maintenance program.
  • To control the environment outboard the primary seal.
  • To control the environment at the primary seal faces.
  • To stage the pressure in a high pressure application.
  • To prevent a pressure drop across the o-rings in an ethylene oxide application.

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