Mechanical Seals - TORISHIMA

Pumps for Rivers,Agricultural Pumping & Drainage,and IrrigationAgricultural drainage pumps［Horizontal mixed-flow pumps］MT9200Pressure:Negative pressureCircumferential speed: Up to 20 m/sShaft diameter:ȭ50 to 300 mmP20Irrigation pumps［Double-suction volute pumps］HU2000 and HB2000 Series（HU2700 /HB2700）［HU2700］River drainage pumps［Vertical axial-flow pumps］［Vertical mixed-flow pumps］［HB2700］［ H U 2 7 0 0 ］ ［ H B 27 0 0 ］Pressure:0 to 1 MPaGCircumferential speed: Up to 20 m/sShaft diameter:ȭ20 to 90 mm0 to 3 MPaGUp to 20 m/sȭ20 to 90 mmP16Agricultural pumps［Horizontal axially split multi-stage volute pumps］MB8500CN ��MB8500CN］ ［MB2400CN］Pressure:0 to 1 MPaGCircumferential speed: Up to 20 m/sShaft diameter:ȭ50 to 300 mm09P20Pressure:0 to 1 MPaGCircumferential speed: Up to 20 m/sShaft diameter:ȭ50 to 500 mmP21Pressure:0 to 5 MPaGCircumferential speed: Up to 60 m/sShaft diameter:ȭ50 to 300 mm0 to 1 MPaGUp to 20 m/sȭ20 to 200 mmP1910

Pumps for Chemical & Petrochemical PlantsCooling water pumps for petrochemical plants［Double-suction volute pumps］MB2000 ］［MB2000］［MB2704CN］Pressure:0 to 3 MPaGCircumferential speed: Up to 20 m/sShaft diameter:ȭ20 to 200 mmP170 to 2 MPaGUp to 20 m/sȭ20 to 200 mmP18Boiler feed pumps for petrochemical plants［High-pressure multi-stage ring-section turbine pumps］MB2500/MB8500CZProcess pumps for chemical plants［MB2500］［Single-suction volute pumps］［MB8500CZ］［MB2500］Pressure:0 to 8 MPaGCircumferential speed: Up to 60 m/sShaft diameter:ȭ50 to 300 mmࠉ［MB8 5 0 0 CZ ］P210 to 5 MPaGUp to 60 m/sȭ50 to 300 mmP19Cooling water pumps for oil refineries［Vertical mixed-flow pumps］MB290111LU1000 Series（LU1107）MU2000 Series（MU2000）Pressure:0 to 0.5 MPaGCircumferential speed: Up to 20 m/sShaft diameter:ȭ20 to 80 mmPressure:0 to 1 MPaGCircumferential speed: Up to 20 m/sShaft diameter:ȭ20 to 200 mmP15P17Pressure:0 to 1 MPaGCircumferential speed: Up to 20 m/sShaft diameter:ȭ50 to 300 mmP2012

Pumps for General & Specialized Industrial PlantsCooling water pumps for paper mills［Double-suction volute pumps］MB2704CNPressure:0 to 2 MPaGCircumferential speed: Up to 20 m/sShaft diameter:ȭ20 to 200 mmP18Boiler feed pumps for utility plants［High-pressure multi-stage ring-section turbine pumps］MB8500CZProcess pumps for food processing plants［Single-suction volute pumps］Pressure:0 to 5 MPaGCircumferential speed: Up to 60 m/sShaft diameter:ȭ50 to 300 mmP19Hot water pumps for buildings［Multi-stage turbine pumps］HB2000 Series（HB2700）13LU1000 Series（LU1107）MU2000 Series（MU2000）Pressure:0 to 0.5 MPaGCircumferential speed: Up to 15 m/sShaft diameter:ȭ20 to 80 mmPressure:0 to 1 MPaGCircumferential speed: Up to 20 m/sShaft diameter:ȭ20 to 200 mmP15P17Pressure:0 to 3 MPaGCircumferential speed: Up to 20 m/sShaft diameter:ȭ20 to 90 mmP1614

Rubber Bellows Mechanical SealsRotating Mechanical SealsLU1000 SeriesHU2000 Series (Unbalanced pplicationThe rubber bellows expands to compensate for face wear and shaftmovement; because the packing does not slide, the shaft does not wear.Also, it accommodates slurry deposition, thereby avoiding problems.Because the rubber packing floats the stationary ring and the rotating ringis supported by the rubber bellows, it has excellent shock-absorbingcharacteristics. The clutch-type rotating transmission can be usedregardless of the direction of rotation.Pressure:Circumferential speed:Shaft diameter:Target fluids:［HU2700］HB2000 Series (Balanced type)Material0 to 0.5 MPaGUp to 20 m/sȭ20 to 80 mmWater, oil,wastewater,warm waterSeal face: SiC/SiC, SiC/carbonPacking: NBR, FKMLD1000 Series (Double ��LD1107(for submersible pumps)］FeaturesThis is a slurry-resistant rubber bellowstype mechanical seal. It incorporateshigh-performance sealing material for longlife and excellent resistance to corrosivefluids. The short mounting dimensionmakes it suitable for retrofitting into pumpswith small housings.15Can be used as a shaft seal forchemical fluids at intermediatepressure, boiler water, and oilrefining equipment. The rotating sideseal is made as a unit for easyhandling. The projection-type clutchis used for transmission of rotation. Itis best suited for fluid machinerysubject to frequent ntial speed:Shaft diameter:Target fluids:［HB2700］0 to 1 MPaG0 to 3 MPaGUp to 20 m/sUp to 20 m/sȭ20 to 90 mmȭ20 to 90 mmWater, warm water, oil, andacidic and alkaline liquidsMaterialSeal face: Tungsten carbide/carbon,tungsten carbide/tungsten carbidePacking: NBR, FKM, PTFE［LD1107(for submersible pumps)］ApplicationPressure:Circumferential speed:Shaft diameter:Target fluids:Material 0.1 to 0.5 MPaGUp to 20 m/sȭ14 to 80 mmSlurries, freezable fluids,wastewater and other fluidsSeal face: (Pump side)Tungsten carbide/tungsten carbide(Motor side)SiC/carbon, SiC/SiC,tungsten carbide/tungsten carbide,tungsten carbide/carbonPacking: NBR, FKM16

Rotating Mechanical SealsCartridge Mechanical SealsMU2000 Series (Unbalanced type) /MB2000 Series (Balanced type)MB2704CN (Inside rotating type) /MB2704CZ (Inside rotating type, with pumping pplicationBecause it is a multi-spring compactrotating seal, it can be used as a doubleseal or tandem seal. This mechanical sealcan be used in industrial process pumpapplications such as oil refining andindustrial chemical fluids.［MB2000］［ MU 2000］Pressure:Circumferential speed:Shaft diameter:Target fluids:［ MB 2000］0 to 1 MPaG0 to 3 MPaGUp to 20 m/sUp to 20 m/sȭ20 to 200 mmWater, warm water, oil, acidic and alkaline liquids,chemical �MB2704CZ］MaterialSeal face: Carbon/SiC, SiC/SiC,carbon/tungsten carbidePacking: NBR, FKMMT2700 (Balanced type)FeaturesThis is a rotating balanced-type cartridgemechanical seal. This cartridge-type sealhas a simple structure that makes it easy toinstall.FeaturesThis is the optimal mechanical seal for high-loadapplications involving high pressure and hightemperature. The multi-spring type rotating sealcools the mechanical seal through circulation inthe pumping ring.17ApplicationPressure:Circumferential speed:Shaft diameter:Target fluids:ApplicationPressure:Circumferential speed:Shaft diameter:Target fluids:Material0 to 2 MPaGUp to 20 m/sȭ20 to 200 mmWater, warm water, oil, andacidic and alkaline liquidsSeal face: SiC/SiC, SiC/carbon,tungsten carbide/carbonMaterial0 to 8 MPaGUp to 20 m/sȭ20 to 200 mmBoiler feedwater, boiler circulating water,high-pressure feedwaterSeal face: SiC/carbon,tungsten carbide/carbon18

Cartridge Mechanical SealsSplit Mechanical Seals (Non-flushing and Dry running application)MB8500CN (Stationary inside type)/MB8500CZ (Stationary inside type, with pumping ring)MB2901 (Stationary balanced type, plit mechanical seals can be replaced withoutdisassembling equipment. This type can beused on positive-pressure equipment.ApplicationPressure:Circumferential speed:Shaft diameter:Target fluids:Material0 to 1 MPaGUp to 20 m/sȭ50 to 300 mmWater, wastewater, seawater, etc.Seal face: SiC/SiC, SiC/carbon,SiC/C composite/SiC/C compositeMU2922 (Stationary balanced type, dry running application)［MB8500CZ］FeaturesStationary balanced cartridge-type mechanicalseals are suitable for high-speed, high-pressure,and high-temperature fluids. Not affected bymachinery distortion, these seals provideexcellent rential speed:Shaft diameter:Target fluids:Material0 to 5 MPaGUp to 60 m/sȭ50 to 300 mmBoiler feedwater, boiler circulating water,high-pressure feedwaterSeal face: SiC/SiC, SiC/carbon,tungsten carbide/carbonMB2400CN (Outside rotating type)FeaturesThis is a compact outside rotating type seal. The outerdimension of the stuffing box is narrow enough to bemounted without modification.19ApplicationPressure:Circumferential speed:Shaft diameter:Target fluids:FeaturesThis split mechanical seal is capable ofnegative-pressure operation and can be used forboth positive-pressure and Circumferential speed:Shaft diameter:Target fluids:-0.1 to 0.1 MPaGUp to 20 m/sȭ50 to 300 mmWater, river water, etc.MaterialSeal face: Carbide coating/carbon,carbide coating/resinMT9200 (Stationary balanced type, dry running application)Material0 to 1 MPaGUp to 20 m/sȭ20 to 200 mmWater, warm water, oil, andacidic and alkaline liquidsSeal face: SiC/SiC, SiC/carbon,tungsten carbide/carbonFeaturesThis split mechanical seal is capable ofnegative-pressure operation. It can be operatedwhile biodegradable grease is fed to the sealface.ApplicationPressure:Circumferential speed:Shaft diameter:Target fluids:MaterialNegative pressureUp to 20 m/sȭ50 to 300 mmRiver water, etc.Seal face: Carbide coating/copper alloy20

Selecting Auxiliary Equipment forTorishima Mechanical SealsStationary Mechanical SealsAuxiliary Equipment for Mechanical SealsMB2500 (Balanced type)The full performance and benefits of mechanical sealscan be achieved with the proper combination of auxiliaryequipment. Thus, care is required in the selection ofauxiliary equipment and mechanical seals. Auxiliaryequipment for mechanical seals is broadly categorizedfor cooling (or warming), flushing, or quenching; thisequipment can be employed alone or in combination.Cooling (warming) through a cooling jacket may have tobe performed when stopped depending to the fluidtemperature and the nature of the fluid.Example of Cooling (Warming)CoolerAir ventFlushing1. Cooling (Warming)FeaturesStationary balanced seals are used for heavy loads under highspeed, high pressure, and high temperature. These seals remainunaffected by the centrifugal forces caused by rotation.In addition, they demonstrate enhanced seal performance, asthey remain square to the seal face and are unaffected bydeterioration of equipment and heat distortion. These mechanicalseals are cooled by circulation through a pumping ring.ApplicationMaterialPressure:Circumferential speed:Shaft diameter:Target fluids:0 to 8 MPaGUp to 60 m/sȭ50 to 300 mmBoiler feedwater,boiler circulating water,high-pressure feedwaterSeal face: SiC/carbon,tungsten carbide/carbonMT4100 (Balanced type)This equipment is used for cooling high-temperaturesealed fluid and for maintaining the warmth of fluids thatcan freeze. Cooling (warming) can be achieved by eitherof two methods: cooling/warming the periphery of theseal face; or installing a jacket on the sealed box or sealcover.A design for cooling should incorporate temperatureadjustment of the sealed fluid within the heat toleranceand cold tolerance of the packing and should havesufficient capacity to absorb the heat generated at theseal face. Be careful that the fluid temperature does notfall excessively, as some fluids can become polymerized.When the purpose is cooling, design to reduce thesaturation temperature of the sealed fluid at ambientatmospheric pressure by 20 C to 30 C. In the case ofnormal water, cooling is used when the temperatureinside the sealed box exceeds 80 C. Because some heatis conducted by the body of the equipment, the coolingcapacity must be designed to incorporate the aboveconditions.Completely purge all air inside the sealed box.Air or gas trapped inside the sealed box reducesthermal conductivity and significantly reduces thecooling (warming) effect. This contributes to abnormalheating and premature wear of the seal face. Thesealed box must be completely purged of all air andgas.FeaturesThese stationary seals incorporate highly wear-resistantmaterials such as tungsten carbide and SiC as seal facematerials. These seals are also suitable for pumping fluidcontaining slurry.21ApplicationPressure:Circumferential speed:Shaft diameter:Target fluids:Cooling jacketFluidcontactingsideCooling of sealed boxAir ventFlushingThermal insulating rming of sealed boxMaterial0 to 1 MPaGUp to 20 m/sȭ50 to 500 mmRiver water, etc.Seal face: Tungsten carbide/tungsten carbide,SiC/SiC22

2. FlushingFlushing is intended to cool the seal face by causing thesealed fluid to flow, thus preventing the stagnation of foreignmatter and intrusion to the seal face. Use a clear solution forthe flushing fluid and inject it as close to the seal face aspossible. If the injection velocity is too fast, the outercircumference will wear if the seal face material is a carbontype. The velocity should be 1–3 m/s. It is possible to use theself-flushing method (using its own fluid as an injection fluidfor flushing) or to use the external flushing method (using aseparate fluid). In addition, it is possible to perform cooling,heating, and slurry removal by installing auxiliary equipmentsuch as coolers, heaters, filters, and cyclone separators at apoint along the flushing piping.When flushing in order to cool the seal face, use thefollowing figure as a guideline because the flow of theflushing liquid differs according to the temperature inside thesealed box and the temperature of the flushing fluid.Injection pressure should be 0.098–0.2 MPa higher thanthe pressure in the sealed box.Amount of flushing fluid (L/min)Carbide/carbonn 3,000 min-1Flushing temperature range: 30 C–40 C50r1temediahaftSeed typUnbalancd tynceBalapthafeStermedia015Typical Configurations of Double Mechanical Seals3. QuenchingQuenching is used to wash out deicers; toxic or explosivefluids; volatile fluids such as LPG; and leaked fluids thatprecipitate and harden when exposed to outside air.Normally, the injection fluid is clear water, but care isrequired because a fluid high in ion content can causefailure of the washer as minerals adhere to the seal face ofthe packing. It is essential that the injection fluid not reactwith the leaked fluid; if there is no suitable fluid, nitrogengas or argon gas may be used.To prevent leakage of the quenching fluid, amechanical seal may be used in addition to an auxiliarybushing, oil seal, lip seal or gland packing.The pressure of the quenching injection fluid should belower than that of the sealed box, typically 0.02–0.05 MPa.If the quenching flow is intended for cooling, about 70% ofthe flushing flow is required.Typical ConfigurationApplied to liquid containing gas or solidmatter, toxic or corrosive liquid.Back-to-backQuenching ExampleAir ventApplied to high toxic liquid or lowpressure equipment in which leakagemust be minimized or collected.FluidcontactingsideTandemSealed fluid pressure (MPa)Sealed fluid pressure and amount of flushing fluidSeparating Solids from the Flushing FluidA) The filter method (30 to 100 mesh)Applied where low pressure fluid whichcannot be sealed with a single seal andfitting length in axial direction is shortand, in addition, leakage must becollected.B) The magnetic filter method23Applied to high toxic liquid or highpressure equipment in which leakagemust be minimized or collected.Applied to very high pressure equipment.1st stage seal is for pressure drop and2nd stage is for sealing.For fluids containing slurry, external flushing is the preferablemethod; however, if no other suitable source of fluid isavailable, the self-flushing method may be employed.In this case, the following methods may be used toseparate solids from the flushing fluid:C) The cyclone separator methodThis method is used to remove any slurry with aspecific gravity higher than that of the sealed fluid.Applied to liquid containing gas andsolid matter, toxic or corrosive liquid,and liquid of high pressure that cannotbe sealed with a single seal.Applied to super-high-pressure equipmentthat cannot be sealed with a single seal,and equipment with wide pressurefluctuations.Flushing QuenchingBoth A) and B) require monitoring to deal withmesh clogging; a safe approach is to switchbetween two filters positioned in parallel and touse a pressure gauge and thermometer. But thesemethods might not remove some of the slurry thatis most harmful to the mechanical seal.Method B) is used for removing ferrous slurry.Typical ApplicationFace-to-faceApplied where high pressure fluid whichcannot be sealed with a single seal andfitting length in axial direction is shortand, in addition, leakage must becollected.24

Piping Plans for Auxiliary Equipment (API 682)Piping Plans for Quenching/Draining Systems and Dual SealsAn appropriate match between piping and auxiliary equipment is required in order to maximize the performance ofmechanical seals. In the piping examples shown in the diagrams below, all plans are numbered according to APIstandards (API682-3rd).Flushing Plans for Single SealsSchematicAPIPlanSelf flushing (Internal flushing)Single seal (Quenching pot type)Q/D54FFQ/DDual seal (Reservoir type/non-pressurized/wet)21F Q/D52LSHLSLF Q/DDual seal (Reservoir type/pressurized/wet)22FQ/DFQ/DPI PSL53ATI23LSHLSLPumping ring circulation (Cooler)Self flushingSingle seal (with quenching provided)F Q/DTIF Q/D61FSelf flushing (Cooler Strainer)HI or CI,HO or CO02Single seal (with no quenching provided)PI PSHTI11Dual seal(External circulation type/pressurized/wet)Self flushing (Cooler)01Dead IPlan62FSingle seal (Drain/leak detection system)Dual seal (Bladder accumulator/pressurized/wet)F Q/DPI PSL53BSelf flushing (Strainer)LSH65FDFSelf flushing (Cyclone separator)TI12F Q/D31Dual seal (Piston type accumulator/pressurized/wet)F Q/DPI PSLLSL53CReverse flushingExternal flushingFIFTI13F Q/D32PIF Q/DTIThrough flushing14Piping diagram codesSelf flushing(Cyclone separator Cooler)FQ/D41F Q/DTI25HI or CI ： Heating fluid inlet orcooling fluid inletHO or CO： Heating fluid exit orcooling fluid exit： Hole for flushingF： Hole for quenching/drainingQ/DOrificeFlow regulatorPressure gaugeLower level sw

experience in pump manufacturing to provide eco-friendly non-flushing seals, easy-maintenance cartridge seals, and a variety of other optimal mechanical seals for a diverse range of applications. Rubber bellows seals Rotating single-spring seals Rotating multi-spring seals Cartridge seals Split seals Stationary seals