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1218617471 standard flush plans for mechanical seal
1218617471 standard flush plans for mechanical seal
1218617471 standard flush plans for mechanical seal
1218617471 standard flush plans for mechanical seal
1218617471 standard flush plans for mechanical seal
1218617471 standard flush plans for mechanical seal
1218617471 standard flush plans for mechanical seal
1218617471 standard flush plans for mechanical seal
1218617471 standard flush plans for mechanical seal
1218617471 standard flush plans for mechanical seal
1218617471 standard flush plans for mechanical seal
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1218617471 standard flush plans for mechanical seal

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  • 1. Standard flush plans for mechanical sealPLAN 01See Figure 1. Integral (internal) recirculation is from pump discharge to seal. Recommended for clean pumpageonly. Care shall be taken to ensure that integral recirculation is sufficient to maintain stable face conditions. a) Piping and instrumentation schematic b) Seal chamber details 1- inlet 2- quench/drain (Q/D) 3- seal chamber Figure 1-PLAN 01PLAN 02See Figure 2. Dead-ended seal chamber with no recirculation of flushed fluid. Self-venting arrangements preferredon horizontal pumps a) Piping and instrumentation schematic b) Seal chamber details 1 plugged connections for possible future circulating fluid 2 vent (V), if required 3 heating/cooling inlet (HI or CI), heating/cooling outlet (HO or CO) 4 quench/drain (Q/D) 5 seal chamber Figure 2-PLAN 02PLAN 11See Figure 3.Recirculation from pump discharge through a flow control orifice to the seal. The flow enters theseal chamber adjacent to the mechanical seal faces, flushes the faces, and flows across the seal back into thepump. a) Piping and instrumentation schematic b) Seal chamber details 1 from pump discharge 2 flush (F) 3 quench/drain (Q/D) 4 seal chamber Figure 3-PLAN 11 www.mechanical-pump-shaft-seals.com www.easterny.com seals@easterny.com
  • 2. PLAN 12See Figure 4. Recirculation from pump discharge through a strainer and flow control orifice to the seal. This planis similar to Plan 11 but with the addition of a strainer to remove occasional particles. Strainers are not normallyrecommended because blockage of the strainer will cause seal failure. a) Piping and instrumentation schematic b) Seal chamber details 1 from pump discharge 2 flush (F) 3 quench/drain (Q/D) 4 seal chamber Figure 4-PLAN 12PLAN 13See Figure 5. Recirculation from pump seal chamber through a flow control orifice and back to the pump suction. a) Piping and instrumentation schematic b) Seal chamber details 1 to pump suction 2 flush (F) 3 quench/drain (Q/D) 4 seal chamber Figure 5-PLAN 13PLAN 14See Figure 6. Recirculation from pump discharge through a flow control orifice to the seal and simultaneouslyfrom the seal chamber through a control orifice (if required) to pump suction. This allows fluid to enter the sealchamber and provide cooling while continually venting and reducing the pressure in the seal chamber. Plan 14 isa combination of Plan 11 and Plan 13. a) Piping and instrumentation schematic b) Seal chamber details1 to pump suction 2 from pump discharge 3 flush inlet (FI) 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
  • 3. PLAN 21See Figure 7.Recirculation from pump discharge through a flow control orifice and cooler, then into the sealchamber. a) Piping and instrumentation schematic b) Seal chamber details 1 from pump discharge 2 flush (F) 3 quench/drain (Q/D) 4 seal chamber TI temperature indicator Figure 7-PLAN 21PLAN 22See Figure 8. Recirculation from the pump discharge through a strainer, a flow control orifice, and a cooler andinto the seal chamber. Strainers are not normally recommended because blockage of the strainer will cause sealfailure. a) Piping and instrumentation schematic b) Seal chamber details1 from pump discharge 2 flush (F) 3 quench/drain (Q/D) 4 seal chamber TI temperature indicator Figure 8-PLAN 22PLAN 23See Figure 9. Recirculation from a pumping ring in the seal chamber through a cooler and back into the sealchamber. This plan can be used on hot applications to minimize the heat load on the cooler by cooling only thesmall amount of liquid that is recirculated. a) Piping and instrumentation schematic b) Seal chamber details1 flush outlet (FO) 2 flush inlet (FI) 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
  • 4. PLAN 31See Figure 10. Recirculation from pump discharge through a cyclone separator delivering the clean fluid to theseal chamber. The solids are delivered to the pump suction line. a) Piping and instrumentation schematic b) Seal chamber details 1 from pump discharge 2 to pump suction 3 flush (F) 4 quench/drain (Q/D) 5 seal chamber Figure 10-PLAN 31PLAN 32See Figure 11. Flush is injected into the seal chamber from an external source. Care must be exercised inchoosing a proper source of seal flush to eliminate potential for vaporization of the injected fluid and to avoidcontamination of the fluid being pumped with the injected flush. a) Piping and instrumentation schematic b) Seal chamber details 1 from external source 2 flush (F) 3 quench/drain (Q/D) 4 seal chamber FI flow indicator PI pressure indicator TI temperature indicator Figure 11-PLAN 32PLAN 41See Figure 12. Recirculation from pump discharge through a cyclone separator delivering the clean fluid to aseal cooler and then to the seal chamber. The solids are delivered to the pump suction line. a) Piping and instrumentation schematic b) Seal chamber details1 from pump discharge 2 to pump suction 3 flush (F) 4 quench/drain (Q/D) 5 seal chamber TI temperature indicator Figure 12-PLAN 41 www.mechanical-pump-shaft-seals.com www.easterny.com seals@easterny.com
  • 5. PLAN 51See Figure 13. External reservoir providing a dead-ended blanket for fluid to the quench connection of the gland. a) Piping and instrumentation schematic b) Seal chamber details 1 reservoir 2 quench (Q) 3 drain (D), plugged 4 flush (F) 5 seal chamber Figure 13-PLAN 51PLAN 52See Figure 14. External reservoir providing buffer liquid for the outer seal of an Arrangement 2 seal. Duringnormal operation, circulation is maintained by an internal pumping ring. The reservoir is usually continuouslyvented to a vapour recovery system and is maintained at a pressure less than the pressure in the seal chamber. a) Piping and instrumentation schematic b) Seal chamber details1 to collection system 2 reservoir 3 make-up buffer fluid 4 flush (F) 5 liquid buffer outlet (LBO)6 liquid buffer inlet (LBI) 7 seal chamber LSH level switch high LSL level switch low LI level indicatorPI pressure indicator PSH pressure switch higha Items above this line are the responsibility of the purchaser; items below this line shall be supplied by the vendor.b Normally open.c If specified. Figure 14-PLAN 52 www.mechanical-pump-shaft-seals.com www.easterny.com seals@easterny.com
  • 6. PLAN 53ASee Figure 15. Pressurized external barrier fluid reservoir supplying clean fluid to the seal chamber. Circulationis by an internal pumping ring. Reservoir pressure is greater than the process pressure being sealed. a) Piping and instrumentation schematic b) Seal chamber details1 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 indicatorPI pressure indicator PSL pressure switch lowa Items above this line are the responsibility of the purchaser; items below this line shall be supplied by the vendor.b Normally open.c If specified. Figure 15-PLAN 53APLAN 53BSee 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 aninternal pumping ring. Heat is removed from the circulation system by an air-cooled or water-cooled heatexchanger. a) Piping and instrumentation schematic b) Seal chamber details1 make-up barrier fluid 2 bladder accumulator 3 bladder charge connection 4 flush (F) 5 liquid barrier outlet (LBO)6 liquid barrier inlet (LBI) 7 seal chamber 8 vent 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
  • 7. PLAN 53CSee 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. Flowis maintained by an internal pumping ring. Heat is removed from the circulation system by an air-cooled orwater-cooled heat exchanger. a) Piping and instrumentation schematic b) Seal chamber details1 make-up barrier fluid 2 piston accumulator 3 flush (F) 4 liquid barrier outlet (LBO) 5 liquid barrier inlet (LBI)6 seal chamber 7 vent LI level indicator LSL level switch low PI pressure indicator PRV pressure relief valvePSL pressure switch low TI temperature indicator Figure 17-PLAN 53CPLAN 54See Figure 18. Pressurized external barrier fluid 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 pressurebeing sealed. a) Piping and instrumentation schematic b) Seal chamber details1 from external source 2 to external source 3 flush (F) 4 liquid barrier outlet (LBO) 5 liquid barrier inlet (LBI)6 seal chamber Figure 18-PLAN 54 www.mechanical-pump-shaft-seals.com www.easterny.com seals@easterny.com
  • 8. PLAN 61See Figure 19. Tapped and plugged connections for the purchaser’s use. Typically this plan is used when thepurchaser is to provide fluid (such as steam, gas, or water) to an external sealing device. a) Piping and instrumentation schematic b) Seal chamber details 1 quench (Q), plugged 2 drain (D), plugged 3 flush (F) 4 seal chamber Figure 19-PLAN 61PLAN 62See Figure 20.Exterior source providing a quench. The quench may be required to prevent solids fromaccumulating on the atmospheric side of the seal. Typically used with a close-clearance throttle bushing. a) Piping and instrumentation schematic b) Seal chamber details 1 quench (Q) 2 drain (D) 3 flush (F) 4 seal chamber Figure 20-PLAN 62PLAN 65See Figure 21. External drain piping is arranged to alarm on high seal leakage, measured by a float type levelswitch. 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 b) Seal chamber details1 to liquid collection system 2 flush (F) 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
  • 9. PLAN 71See Figure 22. Tapped connections for purchaser’s use. Typically, this plan is used when the purchaser may usebuffer gas in the future. a) Piping and instrumentation schematic b) Seal chamber details 1 flush 2 containment seal vent (CSV), plugged 3 containment seal drain (CSD), plugged 4 gas buffer inlet (GBI), plugged 5 seal chamber Figure 22-PLAN 71PLAN 72See Figure 23. Externally supplied gas buffer for Arrangement 2 seals. Buffer gas may be used alone to diluteseal leakage or in conjunction with Plan 75 or 76 to help sweep leakage into a closed collection system. Pressureof buffer gas is lower than the process-side pressure of inner seal. a) Piping and instrumentation schematic b) Seal chamber details1 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 sealsPCV pressure control valve, used to limit buffer gas pressure to prevent reverse pressurization of inner seal and/or limit pressure applied to containment sealPI pressure indicator PSL pressure switch low FSH flow switch higha If specified.b Items to the left of this line shall be supplied by the vendor; items to the right are the responsibility of the purchaser. Figure 23-PLAN 72 www.mechanical-pump-shaft-seals.com www.easterny.com seals@easterny.com
  • 10. PLAN 74See Figure 24. Externally supplied barrier gas used to positively prevent process fluid from leaking toatmosphere. Pressure of barrier gas is higher than process side of inner seal. Venting of the seal chamber maybe required prior to start-up and operation to avoid the collection of gas in the pump. a) Piping and instrumentation schematic b) Seal chamber details1 gas barrier panel 2 vent (if required) 3 gas barrier outlet (normally closed), used only to depressurize seal chamber4 gas barrier inlet 5 seal chamber FE flow meterFIL coalescing filter, used to ensure solids and/or liquids which might be present in barrier gas do not contaminate sealsFSH flow switch high PI pressure indicator PCV pressure control valve, set pressure above process side of inner sealPSL pressure switch lowa Items to the left of this line shall be supplied by the vendor; items to the right are the responsibility of the purchaser.b If specified. Figure 24-PLAN 74PLAN 75See Figure 25. Containment seal chamber drain for condensing leakage on Arrangement 2 seals. This plan isused when pumped fluid condenses at ambient temperatures. System is supplied by vendor. a) Piping and instrumentation schematic b) Seal chamber details1 to vapour collection system 2 to liquid collection system 3 test connection 4 flush (F)5 containment seal vent (CSV), plugged 6 containment seal drain (CSD) 7 gas buffer inlet (GBI) 8 seal chamberLI level indicator LSH level switch high PSH pressure switch high PI pressure indicatorb Items 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
  • 11. PLAN 76See Figure 26. Containment seal chamber drain for non-condensing leakage on Arrangement 2 seals. This planis 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 thepiping /instrumentation harness.The harness shall be pipe of minimum size DN 15 (NPS 1/2). Harness shall be supported from overheadstructure or side stand such that no strain is put on tubing connected to seal gland. a) Piping and instrumentation schematic b) Seal chamber details1 to vapour recovery system 2 tube, see below 3 pipe, see below 4 flush (F) 5 containment seal vent (CSV)6 containment seal drain (CSD) 7 gas buffer inlet (GBI) 8 seal chamber PI pressure indicator PSH pressure switch higha Items 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

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