Where to specify dual seals

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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