EP0010464A1 - Startverfahren und -vorrichtung für eine Pumpe mit kryogener Flüssigkeit - Google Patents

Startverfahren und -vorrichtung für eine Pumpe mit kryogener Flüssigkeit Download PDF

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Publication number
EP0010464A1
EP0010464A1 EP79400677A EP79400677A EP0010464A1 EP 0010464 A1 EP0010464 A1 EP 0010464A1 EP 79400677 A EP79400677 A EP 79400677A EP 79400677 A EP79400677 A EP 79400677A EP 0010464 A1 EP0010464 A1 EP 0010464A1
Authority
EP
European Patent Office
Prior art keywords
pump
npsh
pressure
overpressure
starting
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Withdrawn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
EP79400677A
Other languages
English (en)
French (fr)
Inventor
Jean-Claude Boissin
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.)
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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 Air Liquide SA, LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude filed Critical Air Liquide SA
Publication of EP0010464A1 publication Critical patent/EP0010464A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D9/00—Priming; Preventing vapour lock
    • F04D9/001—Preventing vapour lock
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/02—Stopping, starting, unloading or idling control
    • F04B49/022—Stopping, starting, unloading or idling control by means of pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity

Definitions

  • the present invention relates to a method and a device for starting a cryogenic liquid pump which; under normal operating conditions, must always create an increase in the total pressure of a fluid between a suction port and a discharge port.
  • the NPSH depends on the pressure and the temperature of the fluid, which, in the case of a cold fluid, requires a prior cooling of the pump to ensure the existence of a sufficient NPSH.
  • the user generally uses two valves, one of which allows the pressure to be raised at suction and the other of which allows to cool the pump by circulating liquid through it.
  • the object of the invention is to remedy the drawbacks mentioned previously and to allow a sure start of the cryogenic pump under good operating conditions or, if the operation takes place under unsatisfactory conditions, an immediate stop of said pump.
  • a pump for cryogenic liquid is equipped with a device for measuring the excess pressure of the liquid present at the suction of the pump with respect to its vapor pressure, or NPSH, and with a device for measuring the discharge overpressure with respect to the inlet pressure, or the discharge pressure of said pump, of a means for comparing said NPSH and said overpressure or discharge pressure with respect to two respective set values and said means controlling a device for supplying the pump motor, and start-up tests are carried out after the pump has cooled down, which is only undertaken if the value measured at this instant of the NPSH is greater than said setpoint value and which is not continued, at beyond a brief test period, only if the discharge overpressure or the discharge pressure is greater than its set value.
  • the invention also relates to a device implementing said method.
  • a tank 1 for a cryogenic liquid 2 is connected by a pipe 3 to a receiver for use not shown, this pipe 3 incorporates a cryogenic pump 4 with drive motor 5 and, on the one hand and on the other side of the pump 4, inlet and outlet valves 7 are arranged. Between the valve 6 and the pump 4 is provided a bypass duct 8 equipped with a valve 9 to a heater 10 connected by a pipe 11 at an upper end of the cryogenic tank 1.
  • a device 20 for measuring the NPSH which can be constituted in different ways, but which, in the example shown, comprises a differential pressure switch connected to a pressure measurement device 21 and a temperature measurement device 22, performing the measurement on the fluid passing through the pipe 3 before the pump 4.
  • the measurement device 22 here consists of a bulb inflated with a gas of the same nature as the fluids to be pumped and at a pressure such that at room temperature it is at least equal to the maximum operating pressure of the pump supply tank 1.
  • a fluid of a different nature e.g argon, oxygen
  • This differential pressure measurement device takes the pressures at the location of the device 21 used for the NPSH measuring device and at a location 32 near the discharge port of the pump 4.
  • the NPSH measuring device consists of a differential pressure switch, the low pressure socket of which is connected to a tube terminated by a small sealed capacity, immersed in the suction pipe of the pump near the inlet flange of the latter. This. This capacity is first placed under vacuum, then charged with nitrogen gas at 0.3 MPa (3 bars absolute) at room temperature. The high pressure tap of the pressure switch is connected to the suction pipe of the pump near the inlet flange of the pump.
  • the set value of this pressure switch is set to 0.04 MPa (0.4 bar) so that when the vapor pressure of nitrogen at the pump outlet temperature is more than 0.04 MPa lower at the suction pressure of the pump, an electrical contact C1 of the pressure switch closes.
  • the discharge overpressure measurement device consists of a simple pressure switch, the pressure tap of which is connected to the discharge pipe of the pump.
  • the setpoint of this pressure switch is set to 1 MPa (10 bars) so that, when the pump discharge pressure exceeds 10 bars, an electrical contact C2 of the pressure switch closes.
  • the automatic device 40 performs the functions described above. It is intended to be inserted in the control and supply device for the motor 5 of the pump 4. This motor 5 is supplied with three-phase current, the three phases being represented by the letters R, S and T.
  • the pump 50 control is shown diagrammatically by the start M and stop A pushbuttons acting on the supply of relay R4.
  • the relay R1 When the operator presses the start button M, the relay R1 is energized through the contact R2b, which causes the closing of the self-sustaining contact R1a of this relay, as well as the closing of the contacts R1b and R1c. However, the pump motor is not powered. The previous state is maintained until the external contact C1 (NPSH) closes. Closing contact C1 causes power to relay R3. Contacts R3a and R3b close. Closing R3b causes power to relay R2 through contacts R1b and R3b.
  • the pump motor 5 is supplied via the relay R4 which is supplied through R1c and R2c.
  • contact C2 closes and power is supplied to relay R1 through Rla, R3a, C2.
  • the pump operates as long as the contacts C1, C2 and A remain closed.
  • contact C2 does not close and, after 5 seconds, contact R2b opens.
  • the relay R1 is no longer supplied, the contact R1c opens and the pump motor 5 stops.
  • the opening of one of the contacts C1 or C2 likewise causes the pump to stop.
  • the invention applies to the field of distribution of cryogenic or refrigerating fluids.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
EP79400677A 1978-10-23 1979-09-25 Startverfahren und -vorrichtung für eine Pumpe mit kryogener Flüssigkeit Withdrawn EP0010464A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7830114A FR2439881A1 (fr) 1978-10-23 1978-10-23 Procede et dispositif de demarrage d'une pompe a liquide cryogenique
FR7830114 1978-10-23

Publications (1)

Publication Number Publication Date
EP0010464A1 true EP0010464A1 (de) 1980-04-30

Family

ID=9214056

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79400677A Withdrawn EP0010464A1 (de) 1978-10-23 1979-09-25 Startverfahren und -vorrichtung für eine Pumpe mit kryogener Flüssigkeit

Country Status (3)

Country Link
EP (1) EP0010464A1 (de)
JP (1) JPS5557696A (de)
FR (1) FR2439881A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4913625A (en) * 1987-12-18 1990-04-03 Westinghouse Electric Corp. Automatic pump protection system
FR2866929A1 (fr) * 2004-03-01 2005-09-02 Air Liquide Systeme de pompage d'un fluide cryogenique
EP2060788A1 (de) * 2007-11-16 2009-05-20 Linde AG Verfahren zum Ansteuern einer Pumpenanordnung und Pumpenanordnung

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2931213A1 (fr) * 2008-05-16 2009-11-20 Air Liquide Dispositif et procede de pompage d'un fluide cryogenique
FR3043165B1 (fr) 2015-10-29 2018-04-13 CRYODIRECT Limited Dispositif de transport d'un gaz liquefie et procede de transfert de ce gaz a partir de ce dispositif

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1653732A1 (de) * 1967-03-15 1971-12-23 Klein Schanzlin & Becker Ag Kavitationsschutzeinrichtung
GB1449852A (en) * 1973-08-10 1976-09-15 Coppen J D Control of fluid pumps
FR2374538A1 (fr) * 1976-12-16 1978-07-13 Materiel Telephonique Groupe surpresseur pour liquide

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1653732A1 (de) * 1967-03-15 1971-12-23 Klein Schanzlin & Becker Ag Kavitationsschutzeinrichtung
GB1449852A (en) * 1973-08-10 1976-09-15 Coppen J D Control of fluid pumps
FR2374538A1 (fr) * 1976-12-16 1978-07-13 Materiel Telephonique Groupe surpresseur pour liquide

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4913625A (en) * 1987-12-18 1990-04-03 Westinghouse Electric Corp. Automatic pump protection system
FR2866929A1 (fr) * 2004-03-01 2005-09-02 Air Liquide Systeme de pompage d'un fluide cryogenique
WO2005085637A1 (fr) * 2004-03-01 2005-09-15 L'Air Liquide Société Anonyme à Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procédés Georges Claude Systeme de pompage d’un fluide cryogenique
EP2060788A1 (de) * 2007-11-16 2009-05-20 Linde AG Verfahren zum Ansteuern einer Pumpenanordnung und Pumpenanordnung

Also Published As

Publication number Publication date
FR2439881A1 (fr) 1980-05-23
JPS5557696A (en) 1980-04-28

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Inventor name: BOISSIN, JEAN-CLAUDE