EP1290367A2 - Dispositif d'etancheite et de surveillance - Google Patents

Dispositif d'etancheite et de surveillance

Info

Publication number
EP1290367A2
EP1290367A2 EP00986268A EP00986268A EP1290367A2 EP 1290367 A2 EP1290367 A2 EP 1290367A2 EP 00986268 A EP00986268 A EP 00986268A EP 00986268 A EP00986268 A EP 00986268A EP 1290367 A2 EP1290367 A2 EP 1290367A2
Authority
EP
European Patent Office
Prior art keywords
seal
temperature
monitoring
sensor
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP00986268A
Other languages
German (de)
English (en)
Other versions
EP1290367A4 (fr
Inventor
Glenn G. Pecht
Guy Gardner Williamson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
John Crane Inc
Original Assignee
John Crane Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by John Crane Inc filed Critical John Crane Inc
Publication of EP1290367A2 publication Critical patent/EP1290367A2/fr
Publication of EP1290367A4 publication Critical patent/EP1290367A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
    • F16J15/3492—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member with monitoring or measuring means associated with the seal
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/002—Investigating fluid-tightness of structures by using thermal means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/90—Remote control, e.g. wireless, via LAN, by radio, or by a wired connection from a central computer

Definitions

  • vibration detectors or other detectors such as temperature and pressure detectors
  • the wiring for such systems is costly in time, labor and materials.
  • the detectors used whether permanently installed or periodically applied by an operator, generally monitor the bearings or couplings, either directly or through the housing and do not indicate the condition of the seal, which often presages failures in other components of the pump.
  • the installation of such detectors often involves machining or other intrusive operations for the pumps supplied by the manufacturer.
  • the present invention is directed to a monitoring seal system.
  • the monitoring seal system comprises a seal housing, a seal assembly, a temperature sensor and a controller.
  • the seal assembly sealingly engages a rotary shaft to prevent fluid leakage between the shaft and the housing.
  • the seal assembly has at least one seal.
  • the seal has a primary ring and a mating ring.
  • the temperature sensor senses the temperature in the vicinity of the seal.
  • the controller determines whether an upset condition has occurred based on at least the temperature in the vicinity of the seal.
  • FIG. 1 is a side elevational sectional view of a rotary shaft monitoring seal system according to this invention
  • FIG. 2 is a schematic diagram showing the monitoring seal system of FIG. 1 installed between a fluid pump and its drive shaft which is driven by a motor;
  • FIG. 3 is a more detailed schematic cross-sectional elevational diagram of the detector assembly of FIG. 1;
  • FIG.4 is a schematic diagram showing a number of the detector assemblies of FIG.
  • FIG. 5 is a side sectional view of a seal system having a number of sensors for providing data to a controller to monitor and evaluate the seal performance of a double seal assembly
  • FIG. 6 is a side sectional view of a seal system having a number of sensors for providing data to a controller to monitor and evaluate the seal performance of a tandem seal assembly
  • FIG. 7 is a side sectional view of a seal system having a number of sensors for providing data to a controller to monitor and evaluate the seal performance of a singe seal assembly.
  • FIG. 1 a rotary shaft monitoring seal system 10 according to this invention which includes detector assembly 12, gland plate or seal housing 14 and seal assembly 16 for sealing against fluid flow between machine housing 18 and rotary shaft 20.
  • Seal housing 14 is mounted to machine housing 18 by means of mounting bolts 22.
  • seal assembly 16 Carried by seal housing 14 is seal assembly 16 which includes metal sleeve 24 fixed to and rotatable with shaft 20, and mating ring 26, typically made of ceramic, fixed to and rotatable with metal sleeve 24 in shaft 20. The remainder of seal assembly 16 is fixed to seal housing 14 and does not rotate with shaft 20.
  • seal assembly 14 includes a soft, typically carbon, insert 28 which is press-fit into and held by shell 30, attached to which is metal bellows 32; the other end of bellows 32 is attached to adaptor 34, typically made of metal.
  • Shell 30, bellows 32 and adaptor 34 are typically welded together into a single unit.
  • Detector assembly 12 has a lower portion 40 which may be typically threaded at 42 to engage with threads 44 in port 46 of housing 14. Portion 40 is typically in solid contact with housing 14 so that a vibration detector located in upper portion 48 of detector assembly 12 can directly sense the vibrations through housing 14 from shaft 20. Port 46 also may have a hole or passage 50 extending all the way through housing 14 to communicate with the region proximate seal assembly 16 so that, for example, the fluid in area 52 can move up passage 50 into port 46 to be sensed by a pressure sensor in upper portion 48 and temperature probe 54 can extend down to sense the temperature in the vicinity of seal 16. Although the seal assembly in FIG.
  • Detector assembly 12 will in any case sense the vibrations coming through seal gland plate or seal housing 14, and the temperature and pressure will be sensed in the vicinity of the seal.
  • Monitoring seal system 10 is typically used with a rotary machine such as pump 60, FIG. 2, whose impeller 62 is mounted on shaft 20a driven through coupling 64 by motor
  • bearing housing 68 support shaft 20a. The positioning of the detector
  • SUBSTTTUTE SHE assembly in the seal housing which makes the seal into a monitoring seal system, not only provides easy access to the internal region of the machine where the temperature, pressure and vibration can be meaningfully monitored, it also permits observation of an area, namely the seal, where potential failures can be sensed at the earliest moment. Failure patterns of a bearing or coupling can be sensed by the conditions in the area of the seal assembly even before meaningful indications may be sensible at the bearing housing or coupling.
  • Detector assembly 12 may include a chamber 70, FIG. 3, in upper portion 48 which houses a number of sensor components. Temperature sensor 72 connects with temperature probe 54. Pressure transducer 74 has access through passage 76 to port 46 and bore 0 for sensing the pressure in the area of seal 16. Accelerometer device 78 is connected directly to the top wall 80 of upper portion 48 of detector assembly 12 so that it connects directly through upper wall 80, side cylindrical wall 82 and lower portion 48 to seal housing 14 for directly sensing the vibration in the vicinity of seal assembly 16.
  • Temperature sensor 72, pressure transducer 74 and accelerometer device 78 may each be connected through cables 84, 86 and 88, respectively, to a signal conditioning and communications unit 90 which is connected to antenna 92 for transmitting the sensed conditions back to a central station or host computer.
  • Signal conditioning and communications unit 90 may be simply a transmitter which constantly broadcasts its data accompanied by its identifying code, or it may include a receiver and transmitter for communicating via a handshake protocol with a central station or host computer.
  • Signal conditioning and communication unit 90 may include a microprocessor such as a Motorola 688C 11 F 1 microcontroller and a radio transceiver such as a Digital Wireless Corporation WIT2400M transceiver.
  • Pressure transducer 74 may be an EG &G Model 96 or 97 pressure sensor and temperature sensor 72 may be a thermocouple such as an Omega JMTSS- 125-U-6.
  • Accelerometer device 78 may be a single accelerometer which senses accelerations in one, two or three mutually perpendicular axes or it may be a triaxial accelerometer such as the EG &G Model 3355 which includes three accelerometers with mutually perpendicular axes.
  • An entire network of detector assemblies 12, 12a, 12b, 12c, FIG.4, may communicate with one or more base station transceivers 100 each having its own antenna 102 and a cable connection 104 to a central computer 106 such as a PC Model P4D-66 made by Gateway.
  • the seal and the sensors are integral and require no special installation procedures.
  • the installation of the seal automatically includes the installation of the sensors.
  • the sensor seals once installed, monitor both the condition of the seal and the pump in which the seal is installed simultaneously. Since the condition of the seal is indicative of the condition of the pump and vice versa, the instant invention uniquely monitors both the condition of the seal and the pump without the need for external sensors.
  • the controller can be a Programmable Logic Controller (PLC) or a computer such as a Personal Computer (PC).
  • PLC Programmable Logic Controller
  • PC Personal Computer
  • the controller be scalable. This would then allow the controller to be up-graded from a stand-alone unit to a networked sensor node in an enterprise system.
  • the controller is equipped with analog to digital converters for converting the analog signals received from the sensors.
  • An embodiment of a seal system having a number of sensors and a controller to monitor evaluate the seal performance of a double seal assembly is illustrated in FIG. 5.
  • the seal system 200 includes a stuffing box 202, a spacer 204, a seal housing or also known as a gland plate 206, a rotating shaft 208, a double seal assembly 210, a baseline plug sensor 212, an intermediate plug sensor 216, two thermocouples 218 and 220, a controller (not shown), at least one display unit (not shown) and an input unit (not shown).
  • the double seal assembly 210 consists of two single seals mounted back-to-back.
  • the double seal assembly 210 sealingly engages the rotating shaft 208 to prevent fluid leakage.
  • fluid is defined as any matter in its liquid or vapor state.
  • the double seal assembly 210 has an inboard seal 222 and an outboard seal 224.
  • the inboard seal 222 has an inboard mating ring 226. Axially outwardly of the inboard mating ring 226 is an inboard primary ring 228.
  • the outboard seal 224 has an outboard mating ring 230. Axially inwardly of the outboard mating ring 230 is an outboard primary ring 232.
  • Axially outwardly ofthe inboard primary ring 228 is an inboard disk 234.
  • Axially inwardly ofthe outboard primary ring 232 is an outward disk 236.
  • a spring 238 biasing the inboard
  • the double seal assembly 210 ofthe present invention operates as follows.
  • the seal system 200 defines a process zone 240 upstream of the inboard seal 222 and an intermediate zone 242 between the inboard seal 222 and the outboard seal 224.
  • An atmosphere condition 244 exists downstream ofthe outboard seal 224 or outside the seal system 200.
  • the double seal assembly 210 functions to prevent the escape of fluid located in the process zone 240 to the atmosphere 244.
  • the double seal assembly 210 has two sets of seal mating surfaces which limit escape of fluid from one zone to another zone.
  • the first set of seal mating surfaces is the inward surface of the inboard primary ring 228 which engages with the outward surface ofthe inboard mating ring 226.
  • the engagement ofthe inboard primary ring 228 with the inboard mating ring 226 limits escape of fluid from the process zone 240 to the intermediate zone 242 as shown by arrow A.
  • a barrier fluid can be supplied to the intermediate zone 242.
  • the supply of barrier fluid into the intermediate zone 242 causes the intermediate zone 242 to have a pressure higher than the pressure ofthe process zone 240. If a barrier fluid is supplied to the intermediate zone 242, the seal system 200 would include an inlet port (not shown) defined in the stuffing box.
  • the spacer or the seal housing for supplying the barrier fluid into the intermediate zone and an outlet port (not shown) defined in the stuffing box, the spacer or the seal housing for discharging the barrier fluid from the intermediate zone.
  • the barrier fluid also serves to remove heat from the seal assembly 210.
  • the pressure of the intermediate zone 242 is lower than the pressure ofthe process zone 240.
  • the second set of seal mating surfaces is the outward surface of the outboard primary ring 232 which engages with the inward surface ofthe outboard mating ring 230.
  • the engagement ofthe outboard primary ring 232 with the outboard mating ring 230 limits the escape of fluid from the intermediate zone 242 to the atmosphere 244 as shown by arrow B.
  • the baseline plug sensor 212 is mounted to a monitoring port 246 defined in the stuffing box 202.
  • the baseline plug sensor 212 measures the pressure and temperature of the fluid within the process zone 240.
  • the pressure of the process zone 240 and the temperature of the process zone 240 primarily act as reference pressure and temperature providing for the baseline environment for the seal system 200. It should be noted that while the baseline plug sensor 212 is mounted on the stuffing box 202 in this embodiment, the baseline plug sensor 212 may be mounted on any other portion ofthe seal system 200 which can measure the pressure and temperature of the process zone 240 or any other pressure and temperature which can act as reference pressure and temperature.
  • the baseline plug sensor 212 is an integrated pressure transducer and temperature sensor.
  • the baseline plug sensor 212 should contain no electronics so that it can withstand temperatures up to 500 degrees F. It is preferred that the baseline plug sensor 212 has an operating pressure between 20 to 600 psi, a pressure temperature limit of 500 degree F and an input/output resistance of 5000 Ohms (nominal).
  • the baseline plug sensor's pressure sensing element consists of strain gages bonded to a diaphragm and wired into a full
  • the strain due to pressure causes a change in resistance that unbalances the bridge and produces an electrical output proportional to the applied pressure.
  • the input/output resistance ofthe bridge should be 5000 Ohms nominal.
  • a short pigtail exits from the top of the plug sensor and is spliced to a four conductor shielded Teflon insulated wire for connection to the signal conditioning equipment.
  • the temperature sensing element of the baseline plug sensor consists of a thermocouple welded to the pressure sensing element. The thermocouple leads exit the baseline plug sensor together with pressure signal leads.
  • the intermediate plug sensor 216 identical in construct to the baseline plug sensor 212, is mounted to a monitoring port 248 defined in the seal housing 206.
  • the intermediate assembly plug sensor 216 measures the pressure and temperature of the fluid in the intermediate zone 242.
  • FIG. 5 illustrates thermocouples 218 and 220 attached to the face ofthe inboard mating ring 226 and the face of the outboard mating ring 230. The temperature is measured with a standard metal
  • thermocouple SUBSTTTUTE SHEET R sheathed J or K type thermocouple (optional RTD) which is inserted through a port defined in the stuffing box, the spacer or the seal housing such that the thermocouple is near or in contact with the corresponding mating ring 226 or 230.
  • a coiled J type thermocouple may also be used.
  • thermocouples 218 and 220 Measuring the temperature in the vicinity of the seals by attaching thermocouples 218 and 220 to the faces of the mating rings 226 and 230 is the preferred method. However, attaching thermocouples to the faces ofthe mating rings may not always be feasible. Therefore, an alternative method to measuring the temperature in the vicinity of seals is to use probes extending toward the seal mating surfaces ofthe inboard seal 222 and the outboard seal 224 but not touching the inboard seal 222 or the outboard seal 224. Such probes are illustrated in FIGS. 1-3. Although not shown in FIG. 5, an accelerometer device and/or a liquid leak detector can be optionally used to evaluate the seal performance.
  • FIG. 6 illustrates a seal system having a number of sensors for providing data to a controller to monitor and evaluate the seal performance of a tandem seal assembly.
  • the seal system 300 includes a stuffing box 302, a spacer 304, a seal housing or also known as a gland plate 306, a rotating shaft 308, a tandem seal assembly 310, a baseline plug sensor
  • thermocouples 316 and 318 an intermediate plug sensor 314, two thermocouples 316 and 318, a controller (not shown), at least one display unit (not shown) and an input unit (not shown).
  • the tandem seal assembly 310 consists of two single seals, an inboard seal 320 and an outboard seal 322, mounted in the same direction.
  • Each seal 320 and 322 has a mating ring 324 and 326.
  • Axially inwardly of each mating ring 324 and 326 is a primary ring 328 and 330.
  • Axially inwardly of each primary ring 328 and 330 is a disk 332 and 334.
  • Located axially inwardly of each disk 332 and 334 is a spring 336 and 338 biasing the primary ring 328 and 330 toward the mating ring 324 and 326.
  • the tandem seal assembly 310 of the present invention operates as follows.
  • the seal system 300 defines a process zone 340 upstream of the inboard seal 320 and an intermediate zone 342 between the inboard seal 320 and the outboard seal 322.
  • An atmosphere condition 344 exists downstream ofthe outboard seal 322 or outside the seal system 300.
  • the tandem seal assembly 310 functions to limit the escape of fluid located in the process zone 340 to the atmosphere 344.
  • the tandem seal assembly 310 has two sets of seal mating surfaces which limit escape of fluid from one zone to another zone.
  • the first set of seal mating surfaces is the outward surface ofthe inboard primary ring 328 which engages with the inward surface ofthe inboard mating ring 324.
  • the second set of seal mating surfaces is the outward surface of the outboard primary ring 330 which engages with the inward surface ofthe outboard mating ring 326.
  • the engagement ofthe outboard primary ring 330 with the outboard mating ring 326 limits the escape of fluid from the intermediate zone 342 to the atmosphere 344 as shown by arrow D.
  • the baseline plug sensor 312 is mounted to a monitoring port 348 defined in the stuffing box 302.
  • the baseline plug sensor 312 measures the pressure and temperature of the fluid within the process zone 346.
  • the pressure of the process zone 340 and the temperature ofthe process zone 340 primarily act as reference pressure and temperature providing for the baseline environment for the seal system 300.
  • the baseline plug sensor 312 is mounted on the stuffing box 302 in this embodiment, the baseline plug sensor 302 may be mounted on any other portion ofthe seal system 300 which can provide a baseline environment for the seal system.
  • the baseline plug sensor 312 is identical to the baseline plug sensor 212 disclosed in the embodiment illustrated in FIG. 5.
  • the intermediate plug sensor 31 identical in construct to the baseline plug sensor 312, is mounted to a monitoring port 350 defined in the seal housing.
  • the intermediate assembly plug sensor 314 measures the pressure and temperature of the fluid in the intermediate zone 342.
  • the temperature in the vicinity of each seal 320 and 322 is measured by a thermocouple embedded near or on the corresponding mating ring 324 and 326.
  • the thermocouples 316 and 318 are identical to the thermocouples 218 and 220 disclosed in the embodiment illustrated in FIG. 5. Measuring the temperature in the vicinity ofthe seals 320 and 322 by attaching thermocouples 316 and 318 to the faces ofthe mating rings 324 and 326 is the preferred method. However, attaching thermocouples to the faces ofthe mating rings may not always be feasible.
  • an alternative method to measuring the temperature in the vicinity of seals is to use probes extending toward the seal mating surfaces ofthe inboard seal 320 and the outboard seal 322 but not touching the inboard seal 320 or the outboard seal 322. Such probes are illustrated in FIGS. 1-3.
  • An accelerometer device and/or a liquid leak detector can be optionally used to evaluate the seal performance.
  • FIG. 7 illustrates a seal system having a number of sensors for providing data to a controller to monitor and evaluate the seal performance of a single seal assembly.
  • the seal system 400 includes a stuffing box 402, a seal housing or also known as a gland plate 404, a base line plug sensor 406, a single seal assembly 408, a rotating shaft 410, a thermocouple 412, a controller (not shown), at least one display unit (not shown) and an input unit (not shown).
  • the single seal assembly 408 is located in the seal housing for sealingly engaging the rotating shaft to prevent fluid leakage.
  • the singe seal assembly 408 has a mating ring 414. Axially inwardly of the mating ring 414 is a primary ring 416. Axially inwardly of the primary ring 416 is a disk 418. Located axially inwardly of the disk 418 is a spring 420 biasing the primary ring 416 toward the mating ring 414.
  • the single seal assembly 408 ofthe present invention operates as follows.
  • the seal system 400 defines a process zone 422 upstream ofthe seal 408.
  • An atmosphere condition 424 exists downstream ofthe seal 408 or outside the seal system 400.
  • the seal assembly 408 functions to prevent the escape of fluid located in the process zone 422 to the atmosphere 424.
  • the seal assembly 408 has a mating surface which limit escape of fluid from the process zone 422 to the atmosphere 424.
  • the set of seal mating surfaces is the outward surface ofthe primary ring 416 which engages with the inward surface ofthe mating ring 414. The engagement ofthe primary ring 416 with the mating ring 414 limits escape of fluid from the process zone 422 to the atmosphere 424 as shown by arrow E.
  • the baseline plug sensor 406 is mounted to a monitoring port 426 defined in the stuffing box 402.
  • the baseline plug sensor 406 measures the pressure and temperature of fluid within the process zone 422.
  • the pressure of the process zone 422 and the temperature of the process zone 422 primarily act as reference pressure and temperature providing for the baseline environment for the seal system 400.
  • the baseline plug sensor 406 may be mounted on any other portion ofthe seal system 400 which can provide a baseline environment for the seal system.
  • the baseline plug sensor 406 is identical to the baseline plug sensor 212 disclosed in the embodiment illustrated in FIG. 5.
  • thermocouple 412 embedded near or on the mating ring 414.
  • the thermocouple 412 is identical to the thermocouples 218 and 220 disclosed in the embodiment illustrated in FIG. 5. Measuring the temperature in the vicinity ofthe seal 408 by attaching thermocouple 412 to the face of the mating ring 414 is the preferred method. However, attaching a thermocouple to the face of the mating ring may not always be feasible. Therefore, an alternative method to measuring the temperature in the vicinity of seal is to use a probe extending toward the seal mating surfaces ofthe seal 408 but not touching the seal 408. Such probe is illustrated in FIGS. 1-3. An accelerometer device and/or a liquid leak detector can be optionally used to evaluate the seal performance.
  • the present invention further comprises a LCD display unit.
  • the LCD display unit displays the value ofthe baseline temperature, the baseline pressure, the intermediate temperature, the intermediate pressure, the temperature in vicinity ofthe inboard seal and the temperature in vicinity ofthe outboard seal.
  • the LCD display unit displays the value ofthe baseline temperature, the baseline pressure and the temperature in vicinity ofthe seal. It is preferable for the LCD display unit to display the pressures in a range between 0 to 600 psig and the temperatures in a range between -40 to 600 degree F. It also preferred for the LCD display unit to display an upset or an unstable. An unstable condition is when the seal is running in questionable conditions requiring the seal's environment to be evaluated and the seal carefully monitored.
  • An upset condition is when the seal has reached a precarious condition requiring action to be taken to rectify the situation.
  • the LCD display unit may display an upset or an unstable condition by stating that an upset or an unstable condition has occurred.
  • the LCD display unit can bring to attention, such as highlighting or flashing, the reading(s) providing the basis that an upset or an unstable condition has occurred.
  • An LED display unit can also be used, in conjunction with the LCD display unit or alone, to warn of local upset and/or unstable conditions.
  • a two color light system can be used.
  • a two color light system has a green light to indicate normal conditions and a red light to indicate upset conditions.
  • a three color light system can be used.
  • a three color light system has a green light to indicate normal conditions, a yellow light to indicate unstable conditions and a red light to indicate upset conditions. It is preferred that once an upset condition has been triggered, the display of an upset condition would remain until a reset switch is pushed.
  • the display unit would have the capability to display the corresponding temperature/pressure values and unstable/upset conditions for each individual seal system.
  • the system also includes an input unit attached to the controller.
  • the input unit may be a keyboard or a touch screen LCD display unit.
  • a touch screen LCD display unit is preferred over a keyboard due to the ability of using a single integral unit serving as both the display unit and the input unit.
  • the input unit allows an operator to change the display parameters on the display unit.
  • the input unit allows an operator to adjustably input set values into the controller for various temperatures and pressures and constants which would trigger an upset condition. The set values and constants would depend upon the seal type and the environment in which the seal would operate. An upset condition would be triggered when one or more of the following conditions is met:
  • Temperature of fluid in intermediate zone > Set point of temperature of fluid in intermediate zone (if a double or tandem seal assembly is used).
  • Pressure of fluid in intermediate zone High set point of pressure of fluid in intermediate zone (if a double or tandem seal assembly is used).
  • the controller also has an internal counter keeping track ofthe number of time an upset condition has occurred.
  • the counter can be displayed on an "alarm panel" or an
  • alarm screen on the LCD display unit.
  • the internal counter monitors and records the time
  • the counter can also assess the long term durability and survivability ofthe seal.
  • the controller not only can display and analyze the data received from the sensors for upset conditions, the controller can also save the data received from the sensors and
  • the built in processing functions ofthe controller include, but are not limited to, Arithmetic mean, FFT, Filtering (low-pass, high-pass, median, etc.), Differentiation, RMS. Standard Deviation, Linear Trending and Histograms. The trending
  • An optional feature ofthe present invention is to remedy the upset condition and/or shut down the motor for operating the system.
  • An example of remedying the upset condition would be to increase the flow rate of buffer fluid to the intermediate zone and thus cool the temperature of the component causing the upset condition.
  • Shutting down the motor for operating the system stops the rotation ofthe shaft thus preventing further leakage of fluid through the seal assembly.
  • the shut down feature is particularly advantages should leakage of fluid through the seal assembly creates a dangerous environment.
  • the shut down feature also forces an operator to remedy the cause ofthe upset condition.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Examining Or Testing Airtightness (AREA)
  • Mechanical Sealing (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)

Abstract

La présente invention concerne un dispositif d'étanchéité et de surveillance qui comprend une enveloppe d'étanchéité, un ensemble d'étanchéité, un capteur de température et un contrôleur. L'ensemble d'étanchéité se trouve en contact étanche avec un arbre rotatif de façon qu'il empêche les fuites de fluide entre l'arbre et l'enveloppe. L'ensemble d'étanchéité comprend au moins un joint d'étanchéité. Le joint d'étanchéité comprend une bague d'étanchéité primaire et une bague d'étanchéité d'accouplement. Le capteur de température détecte la température dans le voisinage du joint d'étanchéité. Le contrôleur détermine si un état anormal se présente au moins sur la base de la température dans le voisinage du joint d'étanchéité.
EP00986268A 1999-12-06 2000-12-06 Dispositif d'etancheite et de surveillance Withdrawn EP1290367A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US16925499P 1999-12-06 1999-12-06
US169254P 1999-12-06
PCT/US2000/032991 WO2001040756A2 (fr) 1999-12-06 2000-12-06 Dispositif d'etancheite et de surveillance

Publications (2)

Publication Number Publication Date
EP1290367A2 true EP1290367A2 (fr) 2003-03-12
EP1290367A4 EP1290367A4 (fr) 2003-09-03

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EP00986268A Withdrawn EP1290367A4 (fr) 1999-12-06 2000-12-06 Dispositif d'etancheite et de surveillance

Country Status (3)

Country Link
EP (1) EP1290367A4 (fr)
AU (1) AU2254301A (fr)
WO (1) WO2001040756A2 (fr)

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GB0224862D0 (en) * 2002-10-25 2002-12-04 Aesseal Plc An intelligent sealing system
US8264347B2 (en) 2008-06-24 2012-09-11 Trelleborg Sealing Solutions Us, Inc. Seal system in situ lifetime measurement
EP2686656B1 (fr) * 2011-03-14 2018-10-10 Aktiebolaget SKF Système d'étanchéité avec détecteur
DE102013212004A1 (de) * 2013-06-25 2015-01-08 Robert Bosch Gmbh Hydraulische Anordnung und Verfahren zu deren Steuerung
CN106351868B (zh) * 2016-11-07 2019-04-30 安徽卧龙泵阀股份有限公司 一种集装式水冷却机封及含有该机封的泵
MX2021003448A (es) * 2018-09-27 2021-06-15 Chesterton A W Co Sello mecanico con detector de rfid integrado.
US20230213406A1 (en) * 2021-12-31 2023-07-06 Dresser, Llc Detecting emissions from valve packing

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EP1290367A4 (fr) 2003-09-03
WO2001040756A2 (fr) 2001-06-07
AU2254301A (en) 2001-06-12

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