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API Plan 52

API Plan 52

Reservoir providing buffer liquid for the outer seal of an arrangement 2 unpressurized dual seal. The buffer liquid shall be maintained at a pressure less than seal chamber pressure and less than 2.8 bar (40 PSI).

A  From mechanical seal
B  To mechanical seal
C  Filling connection
D  Cooling water IN
E  Cooling water OUT
F  Drain
G  Connection to flare

API Plan 53A

API Plan 53A

Pressurized barrier fluid reservoir supplying clean fluid for an arrangement 3 pressurized dual seal.

A  From mechanical seal
B  To mechanical seal
C  Filling connection
D  Cooling water IN
E  Cooling water OUT
F  Drain
G  From external pressure source

API Plan 53B

API Plan 53B

Barrier fluid system pressurized by a bladder accumulator supplying clean liquid for an arrangement 3 pressurized dual seal.

A  Cooler
B  Bladder accumulator
C  Drain
D  Vent

API Plan 53C

API Plan 53C

Barrier fluid system pressurized by a piston accumulator supplying clean liquid for an arrangement 3 pressurized dual seal. The barrier pressure is generated from the seal chamber pressure. The system is self-energizing and reacts to fluctuations in the seal chamber fluid pressure.

A  Cooler
B  Piston accumulator
C  Pressure reference
D  Drain
E  Vent

API Plan 54

API Plan 54

Pressurized external barrier fluid system supplying clean liquid for an arrangement 3 pressurized dual seal. The barrier liquid is maintained at a pressure greater than seal chamber pressure and is circulated by an external pump or pressure system.

A  From external source
B  To external source

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)