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API Plan 32

API Plan 32

Injection of clean fluid into the seal chamber from an external source.

A  From external source
B  To seal

API Plan 41

API Plan 41

Recirculation from the pump discharge through a cyclone separator delivering the clean fluid to a cooler and then to the seal chamber. The solids are delivered to the pump suction line.

A  Cyclone separator
B  Cooler
C  Temperature indicator
D  Contaminated liquid IN
E  Clean liquid OUT
F  Separated liquid OUT

API Plan 51

API Plan 51

Reservoir providing a dead-ended blanket for fluid to the quench connection of the gland plate. Only recommended for vertical pumps.

A  Reservoir

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