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API Plan 55

API Plan 55

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


API Plan 61

API Plan 61

Tapped and plugged atmospheric-side connections for purchaser’s use.

A  Connection plugged


API Plan 62

API Plan 62

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


API Plan 65A

API Plan 65A

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


API Plan 65B

API Plan 65B

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)


API Plan 66A

API Plan 66A

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


API Plan 66B

API Plan 66B

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


API Plan 71

Plan 71

Tapped connections for the purchaser’s use e.g., for future use of buffer gas.

A  Connection plugged


API Plan 72

API Plan 72

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


API Plan 74

API Plan 74

Externally supplied barrier gas for arrangement 3 dual pressurized non-contacting gas seals.

A  Gas OUT
B  Gas IN