Standard tandard flush plans for mechanical mechanical seal seal PLAN 01 See Figure 1. Integral (internal) recirculation is from pump discharge to seal. Recommended for clean pumpage only. Care shall be taken to ensure that integral recirculation is sufficient to maintain stable face conditions.
a) Piping and instrumentation schematic 1- inlet
b) Seal Seal chamber details
2- quench/drain (Q/D)
3- seal chamber
Figure 1-PLAN 01
PLAN 02 See Figure 2. Dead-ended seal chamber with n o recirculation of flushed fluid. Self-venting arrangements preferred on horizontal pumps
a) Piping and instrum entation schematic
b) Seal Seal chamber details
1 plugged connections for possible future circulating fluid 3 heating/cooling inlet (HI or CI), heating/cooling outlet (HO or CO)
2 vent (V), if required 4 quench/drain (Q/D) 5 seal chamber
Figure 2-PLAN 02 PLAN 11 See Figure 3.Recirculation from pump discharge through a flow control orifice to the seal. The flow enters the seal chamber adjacent to the mechanical seal faces, flushes the faces, and flows across the seal back into the pump.
a) Piping and instrum entation schematic 1 from pump discharge
2 flush (F)
b) Seal Seal chamber details 3 quench/drain (Q/D)
4 seal chamber
Figure 3-PLAN 11
www.mechanical-pump-shaft-seals.com
www.easterny.com www.easterny.com
seals@easterny.com
PLAN 12 See Figure 4. Recirculation from pump discharge through a strainer and flo w control orifice to the seal. This plan is similar to Plan 11 but with the addition of a strainer to remove occasional particles. Strainers are not normally recommended because blockage of the strainer will cause seal failure.
a) Piping and instrumentation schematic 1 from pump discharge
b) Seal chamber details
2 flush (F)
3 quench/drain (Q/D)
4 seal chamber
Figure 4-PLAN 12 PLAN 13 See Figure 5. Recirculation from pump seal chamber through a flow control orifice and back to the pump suction.
a) Piping and instrumentation schematic 1 to pump suction
b) Seal chamber details
2 flush (F)
3 quench/drain (Q/D)
4 seal chamber
Figure 5-PLAN 13 PLAN 14 See Figure 6. Recirculation from pump discharge through a flow control orifice to the seal and simultaneously from the seal chamber through a control orifice (if required) to pump suction. This all ows fluid to enter the seal chamber and provide cooling while continually venting and reducing the pressure in the seal chamber. Plan 14 is a combination of Plan 11 and Plan 13.
a) Piping and instrumentation schematic 1 to pump suction
2 from pump discharge
3 flush inlet (FI)
b) Seal chamber details 4 flush outlet (FO)
5 quench/drain (Q/D)
6 seal chamber
Figure 6-PLAN 14
www.mechanical-pump-shaft-seals.com
www.easterny.com
seals@easterny.com
PLAN 21 See Figure 7.Recirculation from pump discharge through a flow control orifice and cooler, then i nto the seal chamber.
a) Piping and instrum entation schematic 1 from pump discharge
2 flush (F)
b) Seal chamber details
3 quench/drain (Q/D)
4 seal chamber
TI
temperature indicator
Figure 7-PLAN 21 PLAN 22 See Figure 8. Recirculation from the pump discharge through a strainer, a flow control orifice, and a cooler and into the seal chamber. Strainers are not normally recommended because blockage of the strainer will cause seal failure.
a) Piping and instrumentation schematic 1 from pump discharge
2 flush (F)
b) Seal chamber details
3 quench/drain (Q/D)
4 seal chamber
TI
temperature indicator
Figure 8-PLAN 22 PLAN 23 See Figure 9. Recirculation from a pumping ring in the seal chamber through a cooler and back into the seal chamber. This plan can be used on hot applications to minimize the heat load on the cooler by cooling only the small amount of liquid that is recirculated.
a) Piping and instrum entation schematic 1 flush outlet (FO)
2 flush inlet (FI)
b) Seal chamber details
3 quench/drain (Q/D)
4 seal chamber
5 vent
TI
temperature indicator
Figure 9-PLAN 23
www.mechanical-pump-shaft-seals.com
www.easterny.com
seals@easterny.com
PLAN 31 See Figure 10. Recirculation from pump discharge through a cyclone separator delivering the clean fluid to the seal chamber. The solids are delivered to the pump suction line.
a) Piping and instrumentation schematic 1 from pump discharge
2 to pump suction
3 flush (F)
b) Seal chamber details 4 quench/drain (Q/D)
5 seal chamber
Figure 10-PLAN 31 PLAN 32 See Figure 11. Flush is injected into the seal chamber from an external source. Care must be exercised in choosing a proper source of seal flush to eliminate potential for vaporization of the injected fluid and to avoid contamination of the fluid being pumped with the injected flush.
a) Piping and instrum entation schematic 1 from external source
b) Seal chamber details
2 flush (F) 3 quench/drain (Q/D) 4 seal chamber PI pressure indicator TI temperature indicator
FI
flow indicator
Figure 11-PLAN 32 PLAN 41 See Figure 12. Recirculation from pump discharge through a cyclone separator delivering the clean fluid to a seal cooler and then to the seal chamber. The solids are delivered to the pump suction line.
a) Piping and instrum entation schematic 1 from pump discharge
2 to pump suction
3 flush (F)
4 quench/drain (Q/D)
b) Seal chamber details 5 seal chamber
TI
temperature indicator
Figure 12-PLAN 41
www.mechanical-pump-shaft-seals.com
www.easterny.com
seals@easterny.com
PLAN 51 See Figure 13. External reservoir providing a dead-ended blanket for fluid to the quench connection of the gland.
a) Piping and instrum entation schematic 1 reservoir
2 quench (Q)
3 drain (D), plugged
b) Seal chamber details 4 flush (F)
5 seal chamber
Figure 13-PLAN 51
PLAN 52 See Figure 14. External reservoir providing buffer liquid for the outer seal of an Arrangement 2 seal. During normal operation, circulation is maintained by an internal pumping ring. The reservoir is usually continuously vented to a vapour recovery system and is maintained at a pressure less than the pressure in the seal chamber.
a) Piping and instru mentation schematic 1 to collection system 6 liquid buffer inlet (LBI) PI pressure indicator
b) Seal chamber details
2 reservoir 3 make-up buffer fluid 7 seal chamber LSH level switch high PSH pressure switch high
4 flush (F) 5 liquid buffer outlet (LBO) LSL level switch low LI level indicator
a Items
above this line are the responsibility of the purchaser; items below this line shall be supplied by the vendor. open. c If specified. b Normally
Figure 14-PLAN 52
www.mechanical-pump-shaft-seals.com
www.easterny.com
seals@easterny.com
PLAN 53A See Figure 15. Pressurized external barrier flui d reservoir supplying clean fluid to the seal chamber. Circulation is by an internal pumping ring. Reservoir pressure is greater than the process pressure be ing sealed.
a) Piping and instru mentation schematic
b) Seal chamber details
1 from external pressure source 2 reservoir 3 make-up barrier fluid 4 flush (F) 5 liquid barrier outlet (LBO) 6 liquid barrier inlet (LBI) 7 seal chamber LSH level switch high LSL level switch low LI level indicator PI pressure indicator PSL pressure switch low a Items
above this line are the responsibility of the purchaser; items below this line shall be supplied by the vendor. open. c If specified. b Normally
Figure 15-PLAN 53A
PLAN 53B See Figure 16. External piping provides fluid for the outer seal of a pressurized dual seal arrangement. Pre-pressurized bladder accumulator provides pressure to the circulation system. Flow is maintained by an internal pumping ring. Heat is removed from the circu lation system by an air-cooled or water-cooled heat exchanger.
a) Piping and instrum entation schematic 1 make-up barrier fluid 2 bladder accumulator 6 liquid barrier inlet (LBI) 7 seal chamber 8 vent
b) Seal chamber details
3 bladder charge connection 4 flush (F) 5 liquid barrier outlet (LBO) PI pressure indicator PSL pressure switch low TI temperature indicator
Figure 16-PLAN 53B
www.mechanical-pump-shaft-seals.com
www.easterny.com
seals@easterny.com
PLAN 53C See Figure 17. External piping provides fluid for the outer seal of a pressurized dual seal arrangement. Reference line from the seal chamber to a piston accumulator provides pressure to the circulation system. Flow is maintained by an internal pumping ring. Heat is removed from the circulation system by an air-cooled or water-cooled heat exchanger.
a) Piping and instrum entation schematic 1 make-up barrier fluid 6 seal chamber 7 vent PSL pressure switch low
b) Seal chamber details
2 piston accumulator 3 flush (F) 4 liquid barrier outlet (LBO) 5 liquid barrier inlet (LBI) LI level indicator LSL level switch low PI pressure indicator PRV pressure relief valve TI temperature indicator
Figure 17-PLAN 53C
PLAN 54 See Figure 18. Pressurized external barrier flui d reservoir or system supplying clean fluid to the seal chamber. Circulation is by an external pump or pressure system. Reservoir pressure is greater than the process pressure being sealed.
a) Piping and instrumentation schematic 1 from external source 6 seal chamber
2 to external source
b) Seal chamber details
3 flush (F)
4 liquid barrier outlet (LBO)
5 liquid barrier inlet (LBI)
Figure 18-PLAN 54
www.mechanical-pump-shaft-seals.com
www.easterny.com
seals@easterny.com
PLAN 61 See Figure 19. Tapped and plugged connections for the purchaser’s use. Typically this plan is used when the purchaser is to provide fluid (such as steam, gas, or water) to an external sealing device.
a) Piping and instrumentation schematic 1 quench (Q), plugged
b) Seal chamber details
2 drain (D), plugged
3 flush (F)
4 seal chamber
Figure 19-PLAN 61 PLAN 62 See Figure 20.Exterior source providing a quench. The quench may be required to prevent solids from accumulating on the atmospheric side of the seal. Typically used with a close-clearance throttle bushing.
a) Piping and instrumentation schematic 1 quench (Q)
2 drain (D)
b) Seal chamber details 3 flush (F)
4 seal chamber
Figure 20-PLAN 62 PLAN 65 See Figure 21. External drain piping is arranged to alarm on high seal leakage, measured by a float type level switch. The orifice downstream of the level switch is typically 5 mm (0,25 in) and is located in a vertical piping leg.
a) Piping and instrumentation schematic 1 to liquid collection system
2 flush (F)
b) Seal chamber details
3 quench (Q), plugged
4 drain (D)
5 seal chamber
LSH level switch high
Figure 21-PLAN 65
www.mechanical-pump-shaft-seals.com
www.easterny.com
seals@easterny.com
PLAN 71 See Figure 22. Tapped connections for purchaser’s use. Typically, this plan is used when the purchaser may use buffer gas in the future.
a) Piping and instrum entation schematic 1 flush
b) Seal chamber details
2 containment seal vent (CSV), plugged 4 gas buffer inlet (GBI), plugged
3 containment seal drain (CSD), plugged 5 seal chamber
Figure 22-PLAN 71
PLAN 72 See Figure 23. Externally supplied gas buffer for Arrangement 2 seals. Buffer gas may be used alone to dilute seal leakage or in conjunction with Plan 75 or 76 to help sweep leakage into a closed collection system. Pressure of buffer gas is lower than the process-side pressure of inner seal.
a) Piping and instrumentation schematic
b) Seal chamber details
1 buffer gas panel 2 flush (F) 3 containment seal vent (CSV) 4 containment seal drain (CSD) 5 gas buffer inlet (GBI) 6 seal chamber FE flow meter (magnetic type shown) FIL coalescing filter, used to ensure solids and/or liquids which might be present in buffer gas do not contaminate seals PCV pressure control valve, used to limit buffer gas pressure to prevent reverse pressurization of inner s eal and/or limit pressure applied to containment seal PI pressure indicator PSL pressure switch low FSH flow switch high a If specified. b Items
to the left of this line shall be supplied by the vendor; items to the right are the r esponsibility of the purchaser.
Figure 23-PLAN 72
www.mechanical-pump-shaft-seals.com
www.easterny.com
seals@easterny.com
PLAN 74 See Figure 24. Externally supplied barrier gas used to positively prevent process fluid from leaking to atmosphere. Pressure of barrier gas is higher than process side of inner seal. Venting o f the seal chamber may be required prior to start-up and operation to avoid the collection of gas in the pump.
a) Piping and instrum entation schematic
b) Seal chamber details
1 gas barrier panel 2 vent (if required) 3 gas barrier outlet (normally closed), used only to depressurize seal chamber 4 gas barrier inlet 5 seal chamber FE flow meter FIL coalescing filter, used to ensure solids and/or liquids which might be present in barrier gas do not contaminate seals FSH flow switch high PI pressure indicator PCV pressure control valve, set pressure above process side of inner seal PSL pressure switch low a Items
to the left of this line shall be supplied by the vendor; items to the right are the r esponsibility of the purchaser.
b If specified.
Figure 24-PLAN 74 PLAN 75 See Figure 25. Containment seal chamber drain for condensing leakage on Arrangement 2 seals. This plan is used when pumped fluid condenses at ambient temperatures. System is supplied by vendor.
a) Piping and instrum entation schematic
b) Seal chamber details
1 to vapour collection system 2 to liquid collection system 5 containment seal vent (CSV), plugged 6 containment seal drain (CSD) LI level indicator LSH level switch high PSH pressure switch high b Items
3 test connection 7 gas buffer inlet (GBI) PI pressure indicator
4 flush (F) 8 seal chamber
above this line are the responsibility of the purchaser; items below this line shall be supplied by the vendor.
Figure 25-PLAN 75
www.mechanical-pump-shaft-seals.com
www.easterny.com
seals@easterny.com
PLAN 76 See Figure 26. Containment seal chamber drain for non-condensing leakage on Arrangement 2 seals. This plan is used when pumped fluid does not condense at ambient temperatures. System is supplied by the vendor. Tubing shall be 13 mm (1/2 in) minimum diameter and shall rise continuously from the CSV connection to the piping /instrumentation harness. The harness shall be pipe of minimum size DN 15 (NPS 1/2). Harness shall be supported from overhead structure or side stand such that no strain is put on tubing connected to seal gland.
a) Piping and instrum entation schematic
b) Seal chamber details
1 to vapour recovery system 2 tube, see below 3 pipe, see below 6 containment seal drain (CSD) 7 gas buffer inlet (GBI) 8 seal chamber a Items
4 flush (F) 5 containment seal vent (CSV) PI pressure indicator PSH pressure switch high
above this line are the responsibility of the purchaser; items below this line shall be supplied by the vendor.
Figure 26-PLAN 76
www.mechanical-pump-shaft-seals.com
www.easterny.com
seals@easterny.com
