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MechanicalSeal SupportSystemsAPI 682 Seal PlansApplication GuideConfigurable.Local.Reliable.
2Mechanical Seal Support SystemsContentsWhat is a Seal Support System? . . . . . . . . . . . . . . . . 3Between Seal PlansAPI 682 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Plan 52 Buffer Fluid Seal Pot . . . . . . . . . . . . . . . . . . .Seal System Design Principles . . . . . . . . . . . . . . . . . 3Plan 5 3A B arrier Fluid Seal Pot Pressurizedby Nitrogen . . . . . . . . . . . . . . . . . . . . . . . . . . 35Swagelok Seal Support Systems . . . . . . . . . . . . . . . 5Schematic Symbol Definitions . . . . . . . . . . . . . . . . . 6Swagelok Seal Plan Components . . . . . . . . . . . . . . . 731Plan 53B B arrier Fluid Pressurizedby Bladder Accumulator . . . . . . . . . . . . . . . . 39Process Side PlansPlan 53C B arrier Fluid Pressurizedby Piston Accumulator . . . . . . . . . . . . . . . . . 43Plan 11 Flush . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11Plan 54 B arrier Fluid Pressurizedby External System . . . . . . . . . . . . . . . . . . . . . 47Plan 12 Flush with Strainer . . . . . . . . . . . . . . . . . . . . . . 13Plan 13 Flush from Chamber to Suction . . . . . . . . . . . . 15Plan 55 B uffer Fluid Circulatedby External System . . . . . . . . . . . . . . . . . . . . . 51Plan 14 Flush, Combination of Plans 11 and 13 . . . . . . 17Plan 72 Buffer Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55Plan 21 Cooled Flush . . . . . . . . . . . . . . . . . . . . . . . . . . 19Plan 74 Barrier Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . 59Plan 22 Cooled Flush with Strainer . . . . . . . . . . . . . . . . 21Plan 75 Condensing Leakage Collection . . . . . . . . . . . . 63Plan 23 C ooled Flush,Recirculated through Seal Chamber . . . . . . . . 23Plan 76 Noncondensing Leakage Collection . . . . . . . . . 67Plan 31 Flush with Cyclone Separator . . . . . . . . . . . . . . 25Plan 72/76 B uffer Gas and NoncondensingLeakage Collection . . . . . . . . . . . . . . . . . . . 71Plan 32 External Flush . . . . . . . . . . . . . . . . . . . . . . . . . 27Atmospheric Side PlansPlan 41 Cooled Flush with Cyclone Separator . . . . . . . 29Plan 51 Quench from Reservoir . . . . . . . . . . . . . . . . . . 75Plan 62 Quench from External Source . . . . . . . . . . . .77Plan 65A Leakage Collection with Reservoir . . . . . . . . . 79Plan 65B Leakage Collection with Reservoir . . . . . . . . . 81GlossarySwagelok Component LiteratureReference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 832
Mechanical Seal Support SystemsWhat is a Seal Support System?Seal Support Systems are each designed for a specific mechanical seal and set of process conditions. These systems supply eithera gas or a liquid to the mechanical seal to regulate the environment in which the seal operates, protecting rotating equipment fromdamage. These systems have four main functions: Provide lubrication to seal faces Control pressure and temperature in the seal chamber and seal Flush the seal of contamination and/or residue build up Prevent system process fluid from leaking to atmosphereAPI 682Guided by API 682: Pumps - Shaft Sealing Systems for Centrifugal and Rotary Pumps,Swagelok seal support system designs avoid pipe threads and limit the number ofconnections wherever possible. Based on the fourth edition, the standard design foreach plan includes the minimum arrangement of components as detailed in API 682.Seal System Design PrinciplesWhere beneficial for system troubleshooting, maintenance, or safety, additional optionsare available for Swagelok seal support systems. The addition of isolation valves,bypass loops, and instrumentation are available to assist the pump operator in bothFig. 1API Plan 52maintaining the system and monitoring the health of the seal.Reliability and MaintenanceProper system start-up and commissioning are critical for the operation of mechanical seals and their associated support systems.The inclusion of air within the system at start-up can lead to issues with the seal support system. Flow can be disrupted or stoppedin systems with chillers or seal pots. Air inclusions can also prevent the support system from providing the desired rate of cooling.Including high-point vents in the seal support system allows the system to be vented and cleared of entrapped air.System maintenance during turnarounds and projects requires seal support systems to be drained for servicing. When taking apump out of service, low point drains allow the system to be purged of buffer, barrier, or flush fluids, quickly and safely.Pressure and temperature measurement devices help plant personnel understand what is happening in the seal chamber and sealsupport system. Many Swagelok seal support systems offer additional instrumentation options at points where measuring eitherpressure or temperature would assist in troubleshooting an issue or provide other operational benefit.3
4Mechanical Seal Support SystemsAppropriate FlowWhether the system delivers a flush fluid to the inboard seal or buffer and barrier fluids are circulated between seals in a dual sealarrangement, maintaining proper flow and circulation through the support system and seal chamber is a requirement for effectiveseal operation. A common flow issue is clogged orifices, which can cause a loss of flush fluid to the seal chamber, resulting in sealfailure. Additionally, improper circulation of buffer and barrier fluids can also cause operational issues due to lack of appropriatesystem cooling.When designing seal support systems, it is important to have pressure drop and flow control happen at appropriately engineeredlocations, such as orifices and flow control valves. Components such as filters and strainers can become clogged and createunwanted flow restrictions in seal support systems. These serviceable items should be located in areas that are easy to access andmaintain. Additional options such as bypass loops can be added to the system to ensure a continued supply of flush fluid when afilter or strainer element is being replaced or cleaned.In addition to individual system components that will need to be serviced, the design of tubing runs should be considered criticalto the effectiveness of seal support systems. All tubing runs should be sloped, especially those running to and from the seal. A halfinch per foot (40 mm per meter) of slope is recommended. One-half inch (12 mm) OD tubing is acceptable for differential pressureor pumped flow systems, while three-quarter inch (18 mm) tubing is recommended for systems utilizing a pumping ring or a thermosyphon effect. It is best practice to eliminate the use of elbow fittings and to use large-radius bends in the tubing to further assist flow.System SafetyAPI 682 recommends specific wall thicknesses for 1/2 inch (12 mm) to 1 inch (25 mm) OD tubing. While thinner-walled tubing, suchas that used in general instrumentation installations, is often sufficient to handle the pressure and temperature of seal supportsystems, heavier-wall tubing provides extra rigidity in high-vibration service. Tubing with a heavier wall also creates systems that aremore robust in areas where large pieces of equipment are being maintained and personnel may inadvertently come into contact withthe tubing.In contrast to larger liquid systems which mainly use 1/2 inch (12 mm) and 3/4 inch (18 mm) tubing, API 682 offers no guidanceregarding tubing wall thickness for systems under 1/2 inch (12 mm). Tubing wall thickness for 1/4 inch (6 mm) and 3/8 inch (8 mm/10mm) systems can be selected from Swagelok’s Tubing Data Sheet, MS-01-107, based on the pressure and temperature of theservice. These systems are typically nitrogen filtering and regulating systems for gas seal plans. Swagelok recommends these APIgas plans are mounted on a panel with commonly serviced items such as filters and regulators placed with ease of maintenance inmind.One final safety consideration when choosing the appropriate design for an API plan is the incorporation of block-and-bleed valveson all instruments, including gauges. This recommendation by API adds an additional level of safety for items that need to becalibrated or removed for servicing. Wherever practical, Swagelok seal support systems offer options for including 2-valve manifoldsor other appropriate isolation on instruments.4
Mechanical Seal Support SystemsSwagelok Seal Support SystemsSwagelok seal support systems are offered as kits and assemblies.Seal Plan KitsSeal plan kits (SPK) are a collection of components that are used to connect the seal support plan to the pump.Due to the simplicity of the arrangement, the following API plans are offered only as a kit of components that are ready for fieldinstallation. These kits include all the necessary components to complete the plan: Process side plans: 11, 12, 13, 14, 21, 22, 23, 31, and 41 Atmospheric side plans: 51, 62, 65A, and 65BSeal Plan AssembliesSeal plan assemblies (SPA) are panels, seal pots, or skid systems that comprise the majority of each API seal support plan. The sealplan assembly ordering numbering structure allows for users to select a variety of configurations and additional system componentsto meet specific site or application requirements. Options and configurations not listed in the ordering numbering structure are alsoavailable. To configure those systems, please contact your authorized Swagelok sales and service center.Seal plan assemblies can be ordered alone or with the associated field installation kit to provide a standard installation for sitepersonnel. The following plans are offered fully assembled with a corresponding field installation kit also available for connecting theassembly to the pump: Process side plan 32 Between seal plans 52, 53A, 53B, 53C, 54, 55, 72, 74, 75, 76, and 72/76When procuring seal plan assemblies for pump installations or retrofits, please contact your authorized Swagelok sales and servicecenter to ensure the proper amount of tubing and tube support materials are provided for a safe and effective installation.5
6LegendMechanical Seal Support SystemsSchematic Symbol DefinitionsThe following symbols are used in the P&IDs of the API plans described in this application guide. Optional components will be shownStandard Componentsin red in the P&IDs. Please use this page for reference.Open Needle ValveFlow OrificeClosed Needle ValveOpen Ball ValveY StrainerFIFlowmeterwith Control ValveClosed Ball ValvePressure-reducingRegulatorRelief ValveCheck ValveDPIPDITDifferential Pressure IndicatorFilterCyclone SeparatorDifferential Pressure TransmitterPIPressure GaugePTPressure TransmitterLTLevel Transmitter2-Valve ManifoldQuick-connectLevel GaugeLSLevel SwitchCooling CoilTIThermometerHeat ExchangerTTTemperature TransmitterGear PumpTSteam Trap Test Station3-way Ball ValvePiston Accumulator6Bladder AccumulatorDiaphragm Accumulator
Mechanical Seal Support SystemsSwagelok Seal Plan ComponentsSwagelok seal plan components help keep your rotating equipment running efficiently, with less downtime and fewer leaks. Our2-inch and under components replace traditional threaded and welded pipe connections with bent tubing, tube fittings, and otherquality parts1, like the components shown here. Custom configurations and critical spares are available through your local Swageloksales and service center.API 682, 4th edition supports the use of tubing for mechanical seal support systems.142311Integral Orifice Flange AdapterFrom this.to thisReplace threaded or weldedflange assemblies with aone‑piece flange adapter with anintegral orifice.7
8Mechanical Seal Support SystemsIntegral Orifice Class 300 ANSI Flange Adapter with Tag Ordering InformationIntegral Orafice Flange Adapter with TagDAF 5)Dimensions, in. 22.9(0.90)3/43/4psig mensions, mm (in.)1223/4SS-12MO-F12-300-43359PressureRating720 (49.6)bar (psig)3.2(0.125)49.6 (720)Thermowell TeeFrom this.Thermowell straightAxAReduce threaded connectionsand monitor temperature withintegrated thermowell pre‑weldedinto tube fitting tee for ease ofinstallation.to thisThermowell Tee Ordering Information1/2 in. NPSM1 1/8 in.HexWeldBTubeODStraight PatternDimensionsOrderingNumberAAxAyBEDimensions, in. (mm)Port 1EPort 2Thermowell angle1/2 in. )1.53(38.9)3/4SS-TTW-S12➀3.52(89.4)1.76(44.7)1 1/8 in.Hex2.50 (63.5)EWeldPort 2Port 1Angle Pattern8Ax1.42(36.1)psig 5.7)Dimensions, mm -S18MMPressureRating4900 (337)4600 (316)bar (1.76)75.2(2.96)9.5(0.73)12.7(0.50)15.0(0.59)➀T o order an angle-pattern Thermowell Tee, add -A to the ordering number.337 (4900)316 (4600)Example: SS-TTW-S6-ARefer to Temperature Measurement Devices, Bimetal Thermometers and Thermowellscatalog, MS-02-353, for additional information.
Mechanical Seal Support SystemsExtended Male Connector3From this.Eliminate threaded pipe and potentialleak points with a single fitting. Availablein 4‑ and 6- inch lengths, to allow you toclear the shroud and go straight from thegland to your tubing run in one piece.to thisExtended Male Connector Hex Shank Ordering InformationExtended male connector hex shankF nsions, in. (mm)DA3/83/81/21/21/23/43/4SS-600-1-6-505534.00 (102)SS-600-1-6-494856.00 (152)SS-810-1-8-505534.00 (102)SS-810-1-8-494856.00 (152)SS-1210-1-8-505534.00 (102)SS-1210-1-8-494856.00 (152)SS-1210-1-12-505534.00 (102)SS-1210-1-12-494856.00 (152)psig (bar)0.66 (16.8) 0.28 (7.1)11/167500 (516)0.90 (22.9) 0.41 (10.4)7/86700 (461)1 1/165800 (399)0.47 (11.9)0.96 (24.4)0.63 (16.0)Dimensions, mm (in.)121/2SS-12M0-1-8-50553102 (4.00)SS-12M0-1-8-49485152 (6.00)PressureRatingbar (psig)22.8 (0.90) 9.5 (0.37)22470 (6821)Extended Male Connector Machined Shank Ordering InformationExtended male connector machined shankF nsions, in. (mm)DA3/83/81/21/21/23/43/4SS-600-1-6-521664.00 (102)SS-600-1-6-521676.00 (152)SS-810-1-6-521664.00 (102)SS-810-1-6-521676.00 (152)SS-810-1-8-521664.00 (102)SS-810-1-8-521676.00 (152)SS-1210-1-8-521664.00 (102)SS-1210-1-8-521676.00 (152)SS-1210-1-12-521664.00 (102)SS-1210-1-12-521676.00 (152)psig (bar)0.66 (16.8)0.28 (7.1)0.90 (22.9) 0.41 (10.4)11/167500 (516)7/86700 (461)1 1/165800 (399)0.47 (11.9)0.96 (24.4)0.63 (16.0)Dimensions, mm (in.)121/2183/4SS-12M0-1-8-52166102 (4.00)SS-12M0-1-8-52167152 (6.00)SS-18M0-1-12-52166102 (4.00)SS-18M0-1-12-52167152 (6.00)PressureRatingbar (psig)22.8 (0.90)9.5 (0.37)22470 (6821)24.4 (0.96) 11.9 (0.47)27370 (5370)9
10Mechanical Seal Support Systems4Orifice UnionFrom this.Easily add an orifice to a flushsystem with the orifice union.This fitting makes welding bulkyflange assemblies unnecessary.Tagged for visual identification.to thisOrifice Union Adapter with LanyardUnion orafice adapterEDA0.188(4.8)1/2 in.NPT1/4 in.NPTDPressureRatingEDimensions, in. 1742.11(53.6)1.04(26.4)TubeODFemaleNPTF1/2 in.NPTpsig 700 (461)5800 (399)FlowDimensionsAEFDimensions, in. (mm)1/2SS-8-A-080971/215º10A2.38 (60.5)E.08 (21)Gage PlaneLocated HereDimensionsOrderingNumberOrifice AdapterA1.19(30.2)TubeODPlease includeE-dimension attime of order.E-dimensionwill be between0.125 in. (0.3 mm)and maximumE-dimension for sizeof tube fitting.3/4SS-12-R8-8-08096PressureRatingpsig (bar)4.00(102)0.125(3.2)1 5/84900 (337)1 1/16
Mechanical Seal Support Systems11Process Side PlansAPI Plan 11 FlushPlan 11 Removes heat from the seal chamber Ensures proper pressure in the seal chamber in order to prevent pumped fluid from vaporizing Allows seal chamber to be self-venting when used with horizontal pumpsPlan 11 is available as a kit of components ready for field assembly.Kit contents may include: Swagelok tube fittings Flange adapters TTW series thermowelltee PGI series gauges Pipe fittings V series 2-valve manifold Bimetal thermometer Tubing Pressure transmitter Pipe nippleSee page 83 for additional information on individualcomponents.Plan 11Fig. 2 API Plan 11Kit components shown solid and include some optionalcomponents.PIPITIFrom PumpDischargeFig. 3 API Plan 11 P&IDOptional components shown in red.To SealContact your authorized Swagelok sales and servicecenter for information on optional components.API PLAN 11API Plan 11 recirculates flow from a high‐pressure section of the pump, typically the discharge piping, through a flow control orifice tothe seal. Plan 11 is the default flush plan for most pumps.
12Mechanical Seal Support SystemsAPI Plan 11 continuedAPI PLAN 11Ordering InformationBuild an ordering number by combining the designators in the sequence shown below.Plan 11 Kit12SPK11 - C - C1 P rimary Tubing SizeC 1/2 in.K 12 mm2BCDHJKSeal Connection (Flush) 3/8 in. female NPT 1/2 in. female NPT 3/4 in. female NPT G 3/8 G 1/2 G 3/4123456Seal Connector Type (Flush) Standard female connector➀ Standard male connector 4 in. extended male connector, 6 in. extended male connector, 4 in. extended male connector, 6 in. extended male connector,33441 - C5CDMNPQ6hexhexmachinedmachined➀ I nstallation will require use of pipe nipple (included in kitwhen female connector selected).56171Pump Discharge Connector Type 1/2 in. female NPT 3/4 in. female NPT 1/2 in. Class 150 ANSI flange 1/2 in. Class 300 ANSI flange 3/4 in. Class 150 ANSI flange 3/4 in. Class 300 ANSI flange123456Pump Discharge Instrumentation None Pressure gauge Pressure transmitter Thermometer Pressure gauge and thermometer Pressure transmitter and thermometer1234Flow Control Orifice None Tube fitting union Integral to flange adapter➀ Orifice plate➀7➀ Not compatible with pump discharge instrumentation4Seal Connection Instrumentation (Flush)1 None2 Pressure gauge3 Pressure transmitterpressure gauge or pressure transmitter. Must selectan ANSI flange pump discharge connector with thisoption.MS-02-482, RevC12
Mechanical Seal Support Systems13API Plan 12 Flush with StrainerAPI Plan 12 recirculates flow from a high‐pressure section of the pump, typically the discharge piping, through a flow control orificeto the seal. In order to remove particulate in the flush stream and prevent clogging, flow passes through a strainer placed prior to theflow control orifice. The addition of pressure gauges on either side of the strainer allows the strainer to be monitored for servicing.API PLAN 12Plan 12 Prevents orifice clogging through the addition of a strainer Removes heat and flushes particulate from the seal chamber Ensures proper pressure in the seal chamber to prevent pumped fluid from vaporizing Allows the seal chamber to be self-venting when used with horizontal pumpsPlan 12 is available as a kit of components ready for field assembly.Kit contents may include: Swagelok tube fittings PGI series gauges Flange adapters Tubing Pressuretransmitter Pipe fittings V series 2-valve manifold Bimetal thermometer Pipe nipple Y strainer TTW series thermowell teeSee page 83 for additional information on individualcomponents.Plan 12Fig. 4 API Plan 12Kit components shown solid and include some optionalcomponents.PIPIPIPITIFrom PumpDischargeTo SealFig. 5 API Plan 12 P&IDOptional components shown in red.Contact your authorized Swagelok sales and service center for information on optional components.
14Mechanical Seal Support SystemsAPI Plan 12 continuedOrdering InformationAPI PLAN 12Build an ordering number by combining the designators in the sequence shown below.Plan 12 Kit12SPK12 - C - C341 P rimary Tubing SizeC 1/2 in.K 12 mm2BCDHJKSeal Connection (Flush) 3/8 in. female NPT 1/2 in. female NPT 3/4 in. female NPT G 3/8 G 1/2 G 3/4123456Seal Connector Type (Flush) Standard female connector➀ Standard male connector 4 in. extended male connector, 6 in. extended male connector, 4 in. extended male connector, 6 in. extended male connector,3541 - C5CDMNPQ6123456hexhexmachinedmachined76178B - APump Discharge Connector Type 1/2 in. female NPT 3/4 in. female NPT 1/2 in. Class 150 ANSI flange 1/2 in. Class 300 ANSI flange 3/4 in. Class 150 ANSI flange 3/4 in. Class 300 ANSI flangePump Discharge Instrumentation None Pressure gauge Pressure transmitter Thermometer Pressure gauge and thermometer Pressure transmitter and thermometerPump Discharge Orifice1 None2 Tube fitting union➀ I nstallation will require use of pipe nipple (included in kitwhen female connector selected).4Seal Connection Instrumentation (Flush)1 None2 Pressure gauge3 Pressure transmitter8ACDGFiltration Filter only Manual bypass valves Inlet/outlet gauges Manual bypass valves with inlet/outlet gaugesMS-02-482, RevC14
Mechanical Seal Support Systems15API Plan 13 Flush, from Chamber to SuctionAPI Plan 13 recirculates flow from the seal chamber to the suction side of the pump. This plan is common for vertical pumps.Plan 13 Allows the seal chamber to be self-venting when used with horizontal pumpsPlan 13 is available as a kit of components ready for field assembly.Kit contents may include: Swagelok tube fittings Flange adapters Pipe fittings V series 2-valve manifold Bimetal thermometer TTW series thermowell tee PGI series gauges Tubing Pressure transmitter Pipe nipplePlanFig. 6 API Plan 13Kitcomponentsshownsolidand include some optional components.13PISee page 83 for additional informationon individual components.PITITo PumpSuctionFrom SealFig. 7 API Plan 13 P&IDOptional components shown in red.Contact your authorized Swagelok sales and service center for information on optional components.API PLAN 13 Removes heat and flushes particulate from the seal chamber
16Mechanical Seal Support SystemsAPI Plan 13 continuedOrdering InformationAPI PLAN 13Build an ordering number by combining the designators in the sequence shown below.Plan 13 Kit12SPK13 - C - C1 P rimary Tubing SizeC 1/2 in.K 12 mm2BCDHJKSeal Connection (Flush) 3/8 in. female NPT 1/2 in. female NPT 3/4 in. female NPT G 3/8 G 1/2 G 3/4123456Seal Connector Type (Flush) Standard female connector➀ Standard male connector 4 in. extended male connector, 6 in. extended male connector, 4 in. extended male connector, 6 in. extended male connector,312345644CDMNPQ66171Pump Suction Connector Type 1/2 in. female NPT 3/4 in. female NPT 1/2 in. Class 150 ANSI flange 1/2 in. Class 300 ANSI flange 3/4 in. Class 150 ANSI flange 3/4 in. Class 300 ANSI flangePump Suction Instrumentation1 None2 Pressure gauge3 Pressure transmitter7hexhexmachinedmachined51 - C5➀ I nstallation will require use of pipe nipple (included in kitwhen female connector selected).431234Pump Suction Orifice None Tube fitting union Integral to flange adapter➀ Orifice plate➀➀N ot compatible with pump suction instrumentationpressure gauge or pressure transmitter. Must select anANSI flange pump suction connector with this option.Seal Connection Instrumentation (Flush) None Pressure gauge Pressure transmitter Thermometer Pressure gauge and thermometer Pressure transmitter and thermometerMS-02-482, RevC16
Mechanical Seal Support Systems17API Plan 14 Flush, Combination of Plans 11 and 13API Plan 14 combines Plan 11 and Plan 13. Flow is recirculated from the pump discharge into the seal chamber and from the sealchamber to the pump suction. Fluid flow is increased since the seal chamber is continuously vented, leading to higher coolingcapacity.API PLAN 14Plan 14 Removes heat and flushes particulate from the seal chamber Controls seal chamber pressure on vertical pumpsPlan 14 is available as a kit of components ready for field assembly.Kit contents may include: Swagelok tube fittings Flange adapters Pipe fittings V series 2-valve manifold Bimetal thermometer TTW series thermowell tee PGI series gauges Tubing Pressure transmitter Pipe nipplePlan 14Fig. 8 API Plan 14Kit components shown solid and include some optional components.See page 83 for additionalinformation on individual components.PIPITIFrom PumpDischargeTISealFig. 9 API Plan 14 P&IDOptional components shown in red.SealChamberContact your authorized Swagelok sales and service center for information on optionalcomponents.To PumpSuction
18Mechanical Seal Support SystemsAPI Plan 14 continuedOrdering InformationAPI PLAN 14Build an ordering number by combining the designators in the sequence shown below.Plan 14 Kit1SPK14 - C -2C344 - C1 P rimary Tubing SizeC 1/2 in.K 12 mm2BCDHJKSeal Connection (Flush Inlet) 3/8 in. female NPT 1/2 in. female NPT 3/4 in. female NPT G 3/8 G 1/2 G 3/4123456Seal Connector Type (Flush Inlet) Standard female connector➀ Standard male connector 4 in. extended male connector, hex 6 in. extended male connector, hex 4 in. extended male connector, machined 6 in. extended male connector, machined3➀ I nstallation will require use of pipe nipple (included in kitwhen female connector selected).4BCDHJKSeal Connection (Flush Outlet) 3/8 in. female NPT 1/2 in. female NPT 3/4 in. female NPT G 3/8 G 1/2 G 3/4123456Seal Connector Type (Flush Outlet) Standard female connector➀ Standard male connector 4 in. extended male connector, hex 6 in. extended male connector, hex 4 in. extended male connector, machined 6 in. extended male connector, machined5➀ I nstallation will require use of pipe nipple (included in kitwhen female connector selected).6 Seal Connection Instrumentation (Flush123456Outlet) None Pressure gauge Pressure transmitter Thermometer Pressure gauge and thermometer Pressure transmitter and thermometer56478910 11 121 - C 1 2 - C 1 27CDMNPQ8Pump Discharge Connector Type 1/2 in. female NPT 3/4 in. female NPT 1/2 in. Class 150 ANSI flange 1/2 in. Class 300 ANSI flange 3/4 in. Class 150 ANSI flange 3/4 in. Class 300 ANSI flange123456Pump Discharge Instrumentation None Pressure gauge Pressure transmitter Thermometer Pressure gauge and thermometer Pressure transmitter and thermometer1234Flow Control Orifice (from discharge) None Tube fitting union Integral to flange adapter➀ Orifice plate➀9➀ Not compatible with pump suction instrumentationpressure gauge or pressure transmitter. Must select anANSI flange pump suction connector with this option.10 Pump Suction Connector TypeC 1/2 in. female NPTD 3/4 in. female NPTM 1/2 in. Class 150 ANSI flangeN 1/2 in. Class 300 ANSI flangeP 3/4 in. Class 150 ANSI flangeQ 3/4 in. Class 300 ANSI flange11 Pump Suction Instrumentation1 None2 Pressure gauge3 Pressure transmitter4 Thermometer5 Pressure gauge and thermometer6 Pressure transmitter and thermometer12 Flow Control Orifice (to suction)1 None2 Tube fitting union3 Integral to flange adapter➀4 Orifice plate➀➀ Not compatible with pump suction instrumentationpressure gauge or pressure transmitter. Must select anANSI flange pump suction connector with this option.MS-02-482, RevC18
Mechanical Seal Support Systems19API Plan 21 Cooled FlushAPI Plan 21 adds a cooler to Plan 11 for applications requiring better control of flush vapor margin. Flow is routed from the dischargeside of the pump through an orifice and a cooler before being returned to the seal chamber.API PLAN 21Plan 21 Provides cooled flush fluid to the process side of the seal Removes heat and flushes particulate from the seal chamber Improves fluid vapor margin in the seal chamberPlan 21 is available as a kit of components ready for field assembly.Kit contents may include: Swagelok tube fittings PGI series gauges Flange adapters Tubing Pipe fittings Pressure transmitter V series 2-valve manifold Heat exchanger 63 series ball valve Heat exchanger stand Bimetal thermometer Pipe nipple TTW series thermowell teeSee page 83 for additional information on individualcomponents.Plan 21Fig. 10 API Plan 21Kit components shown solid and include some optional components.PITIFrom PumpDischargePITICoolantInCoolantOutTo SealDrainFig. 11 API Plan 21 P&IDOptional componentsshown in red.Contact your authorizedSwagelok sales and servicecenter for information onoptional components.
20Mechanical Seal Support SystemsAPI Plan 21 continuedOrdering InformationAPI PLAN 21Build an ordering number by combining the designators in the sequence shown below.Plan 21 Kit12SPK21 - C - C1 P rimary Tubing SizeC 1/2 in.K 12 mm2BCDHJKSeal Connection (Flush) 3/8 in. female NPT 1/2 in. female NPT 3/4 in. female NPT G 3/8 G 1/2 G 3/4123456Seal Connector Type (Flush) Standard female connector➀ Standard male connector 4 in. extended male connector, 6 in. extended male connector, 4 in. extended male connector, 6 in. extended male connector,344CDMNPQ6hexhexmachinedmachined51 - C5➀ I nstallation will require use of pipe nipple (included in kitwhen female connector select
regarding tubing wall thickness for systems under 1/2 inch (12 mm). Tubing wall thickness for 1/4 inch (6 mm) and 3/8 inch (8 mm/10 mm) systems can be selected from Swagelok's Tubing Data Sheet, MS-01-107, based on the pressure and temperature of the service. These systems are typically nitrogen filtering and regulating systems for gas seal .
