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Unpressurized external buffer fluid system supplying clean buffer liquid for the outer seal of an arrangement 2 unpressurized dual seal. Buffer liquid is circulated by an external pump or pressure system.
A From external source B To external source
Tapped and plugged atmospheric-side connections for purchaser’s use.
A Connection plugged
Quench stream from an external source to the atmospheric side of the seal faces. The quench stream can be low pressure steam, nitrogen or clean water.
A Valve B Check valve C Drain
Atmospheric leakage collection and alarm system for condensing leakage. Failure of the seal will be detected by an excessive flow rate into the leakage collection system.
A From mechanical seal B To liquid collection system C Valve (locked open) D Flow control orifice
Atmospheric leakage collection and detection system for condensing leakage. Failure of the seal will be detected by a cumulative leakage into the system.
A From mechanical seal B To liquid collection system C Valve (locked open) D Valve (normally closed)
Throttle bushings in the seal gland minimize the seal leakage leaving the seal gland and allow for detection of a seal failure by an alarm of the monitoring pressure transmitter.
A Pressure transmitter B Segmented bushing
An orifice plug in the drain port minimizes the seal leakage leaving the seal gland and allows for detection of a seal failure by an alarm of the monitoring pressure transmitter.
A Pressure transmitter B Segmented bushing C Orifice plug drain
Tapped connections for the purchaser’s use e.g., for future use of buffer gas.
Externally supplied buffer gas for arrangement 2 unpressurized seals with a dry running containment seal. Buffer gas is maintained at a pressure less than seal chamber pressure.
A Gas OUT B Gas IN
Externally supplied barrier gas for arrangement 3 dual pressurized non-contacting gas seals.