EP0844961B1 - Cargo discharging pump - Google Patents
Cargo discharging pump Download PDFInfo
- Publication number
- EP0844961B1 EP0844961B1 EP96926672A EP96926672A EP0844961B1 EP 0844961 B1 EP0844961 B1 EP 0844961B1 EP 96926672 A EP96926672 A EP 96926672A EP 96926672 A EP96926672 A EP 96926672A EP 0844961 B1 EP0844961 B1 EP 0844961B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump
- pipe
- stripping
- discharge
- arrangement
- 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.)
- Expired - Lifetime
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B27/00—Arrangement of ship-based loading or unloading equipment for cargo or passengers
- B63B27/24—Arrangement of ship-based loading or unloading equipment for cargo or passengers of pipe-lines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
- F04D13/086—Units comprising pumps and their driving means the pump being electrically driven for submerged use the pump and drive motor are both submerged
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2261—Rotors specially for centrifugal pumps with special measures
- F04D29/2277—Rotors specially for centrifugal pumps with special measures for increasing NPSH or dealing with liquids near boiling-point
Definitions
- the present invention relates to a discharge pump arrangement which is submersible in the cargo of the cargo tank of a ship and which has a pump inlet arranged in or at a well at the bottom of the tank.
- the invention relates to an discharge pump arrangement, which is submersible in the cargo of a ship's cargo tank and which has a pump inlet arranged in or at a well at the bottom of the ship's cargo tank, where the impeller of the pump is equipped with an extra pump arrange-ment, which is drive connected to the impeller of the pump, and where the discharge pipe of the discharge pump over the deck of the ship is equipped with a closing valve and beneath the closing valve is coupled via an intake to a supply of compressed air or compressed gas and also between the closing valve and the discharge pump is coupled to an outlet for a stripper pipe having an associated closing valve relative to a delivery location via the upper deck of the ship.
- submersible discharge pumps in the form of hydraulic discharge pumps it is possible to unload cargo optimally with a stepless capacity control in all kinds of types of cargo.
- a discharge pump in the form of an elongate, rigid pump arrangement, which is readily dis-mountable, that is to say inter alia easily submersible and hoistable relative to the well at the bottom of the cargo tank.
- a pump impeller which is driven by a hydraulically driven motor via a short drive shaft, the pump impeller and the pump motor being adapted to be arranged just at the bottom of the ship's cargo tank.
- the inlet to the pump is bounded between the bottom of the cargo tank and the opposite lower portion of the pump arrangement. The distance between the underside of the pump arrangement and the bottom of the well of the cargo tank is adapted according to the flow cross-section through the pump.
- the discharge pump can empty the cargo to a level at the under side of the pump arrangement. There will consequently be left behind a first cargo residue in the well, that is to say at the level beneath the under side of the pump arrangement, together with a second cargo residue left behind within the pump itself.
- stripping arrangements have been employed in practice for collecting such residues of the cargo, that is to say stripping arrangements, which operate partially together with and partially independently of the discharge pump.
- stripping arrangements By such stripping arrangements it has been possible to effect the cleansing in a controlled accurate and effective manner together with the discharge pump.
- stripping arrangements it has been customary, while maintaining the pump's impeller in operation with a certain pump pressure against the residual cargo in the pump, with an extra supplied counter pressure produced by compressed air or compressed gas, to blow the residues of the cargo from the pump pipe via a connected strip conduit to a suitable delivery location via the upper deck of the ship.
- An objective of the present invention is to use inter alia said stripping technique for removing the residues of cargo from the pump.
- the aim is inter alia to be able to solve the last-mentioned problem in a constructionally and operatively simpler manner.
- the aim is to adjust the conditions so that the largest possible quantity of the cargo residues which necessarily remains in the pump arrangement after the conclusion of a normal discharge operation can be removed.
- an extra pump arrangement is arranged on the pump's impeller in the form of opposite pairs of locally defined blades, which are located downstream just within the inlet of the pump, that the stripping pipe communicates with the pump housing or the lower portion of the discharge pipe at a first height level at the upstream end of the stripping pipe, where the stripping pipe is supplied with extra pressure medium internally via the discharge pipe, and that the stripping pipe communicates at least at a second height level substantially above the first height level with an internal and/or external pressure medium- or vacuum source for the supply of extra pressure medium or vacuum to the stripping pipe.
- Fig. 1 there is shown a cargo tank 10 of a ship, where the bottom 11 of the tank 10 is illustrated, which is provided with a locally defined tank well 12, in which there is submerged a lower end of the pump, that is to say an inlet end 13 shown for a pump arrangement 14.
- the pump arrangement 14 is adapted to function submerged in the cargo in the tank 10 in a relatively free downwardly hanging condition, with local centering side supports, not shown further, disposed at suitable height levels in the cargo tank, for example along the one tank wall.
- the tank well 12 is, as shown in Fig. 3, given an optimum design for the sake of the collection and flow of cargo to the pump and is in this connection given a concavely rounded form. If desired in a manner not shown further there can be arranged on the bottom of the tank well 12 just below the inlet end 13 of the pump a cross-shaped portion or another portion which counteracts the flow of the cargo in a rotating manner along the bottom of the tank well 12.
- the pump arrangement 14 is of a corresponding submersible type and has a corresponding sealing and a corresponding mode of operation to that which is illustrated and described in NO 123 115.
- a pump means comprising a pump impeller 15, which is received in a snail housing-like pump housing 16.
- the pump housing 16 is freely axially moveable relative to the well 12 and is centered relative to this by means of a combined support/ control and splash shield 16a, which is fastened with lugs 16b to the bottom 11 of the tank just by the tank well 12.
- a combined support/ control and splash shield 16a which is fastened with lugs 16b to the bottom 11 of the tank just by the tank well 12.
- an inverted funnel-shaped guide shield fastened to the pump housing 16 just beneath lower edge 15a of the impeller 15.
- the impeller 15 is driven via a short drive shaft 17 of a high pressure hydraulic drive motor 18.
- the drive motor 18 is connected to a remotely disposed source of pressure medium (not shown) via a coupling means 19 on deck 22 of the ship, by means of supply and discharge conduits (not shown further) for hydraulic drive medium.
- the coupling means 19 is placed on a hatch cover 20, which covers a hatch opening 21 on deck 22 of the ship.
- the supply and discharge conduits are surrounded in the illustrated embodiment by a common protective pipe 23, while the drive motor 18 is surrounded by an outer protective housing 24, in order to prevent any form of leakage of drive medium into the cargo, and vice versa , as is shown in NO 123 115.
- a branch pipe 25a,25b upwardly towards a transition portion 26a of a common cargo discharge pipe 26.
- the discharge pipe 26 and the protective pipe 23 for the hydraulic supply and discharge conduits separately pass through the cover 20.
- the discharge pipe 26 runs further to a suitable discharge location, as shown by an arrow A, on the ship's deck 22.
- the cargo residue which remains behind in the discharge pipe 26 below the valve 27, when this is closed, and the cargo residue R (10-12 litres), which remains behind in the tank well 12, are thereafter removed by means of a stripping function, in which the pump impeller 15 is maintained in continuous operation also after termination of the normal discharge operation.
- a stripping function in which the pump impeller 15 is maintained in continuous operation also after termination of the normal discharge operation.
- a stripping pipe 28 which has an intake opening 29 connected to the discharge pipe 26 a distance below the valve 27.
- the opening 29 is connected to the transition portion 26a of the discharge pipe 26, that is to say connected downstream of the adjacent discharge branch conduits 25a,25b.
- the stripping pipe 28 has a discharge opening 30 connected to the discharge pipe 26 in a portion 26b at the rear, that is to say downstream of the valve 27. Upstream just in front of the opening 30 a second closing valve 31 is inserted.
- the afore-mentioned stripping operation removes in practice the major portion of the cargo in the discharge pipe 26, but hitherto it has been difficult to get removed the last residues of the cargo in the well 12 and that portion, which is still to be found in lower branch pipes 25a,25b of the discharge system as a result of static pressure from such cargo residues.
- the present invention aims especially at removing the said cargo residue during the utilisation of at least certain components and certain main functions of the pump arrangement 14, as shown and described with reference to Fig. 1-2.
- Fig. 3 and Fig. 3A-3C in which in connection with the known pump impeller 15 there is drawn in an extra pump arrangement 33,34.
- impeller 15 of the pump arrange-ment 14 there is secured to impeller 15 of the pump arrange-ment 14 an extra pump arrangement in the form of a pair of relatively small, mutually separated, that is to say opposite blades 33,34, which are fastened each on its diametrically opposite side of the impeller 15 just by its lower edge 15a.
- the blades project slightly outwards in a radial direction by an order of magnitude of 1/5 to 1/15 of the radius of the pump inlet and has a limited dimension along the periphery of the pump inlet of an order of magnitude of 1/10-1/20 of the dimension of the periphery.
- the blades 33,34 are designated herein as an extra pump arrangement, while it is apparent that this extra pump arrangement, which is fastened to the impeller 15, is driven by the impeller 15 and besides as to flow cooperates intimately with the impeller 15.
- the extra pump arrangement is particularly effective in connection with the stripping phase according to the present invention, that is to say in the stripping phase which will be described in what follows, but is necessarily also active in the discharge operation itself.
- the pump arrangement In a typical ship's cargo tank the pump arrangement has a height from the bottom 11 of the tank 10 to just above the hatch cover 20 on top of the tank of about 20 metres, while the remaining discharge equipment at the discharge location requires an additional lifting height of an order of magnitude of 10 metres.
- the impeller 15 of the pump arrangement normally has a counter pressure of 30 metres liquid height, and then with a pump pressure of about 30 bars. It is usual in submersible pump arrangements of known construction that at pump pressures of said order of magnitude a significant out flow (leakage) of pump medium takes place via upper and lower gaps in the pump housing 16 of the pump arrangement between the impeller 15 and sealing arrangements not shown further in the pump housing 16.
- a branch conduit 35a is employed from a diffuser portion 36 in a respective one of the branch pipes 25a (25b) to a common transition portion 37 of the dis-charge pipe 26.
- a branch conduit 35a is shown, the remaining branch conduit passing hidden behind the illustrated branch conduit.
- an effective air-lifting effect (airlift effect) can be obtained on the cargo or the cargo/air mixture in the lower portions of the branch pipes 25a (25b), due to compressed air or inert gas under pressure, which is supplied from the cargo pipe 26 to the stripping pipe 28 via the inlet opening 29 producing a first pulling along effect against the cargo or cargo/air mixture in the upper portion of the branch pipes 25a (25b) and an extra pulling along effect at the lower end of the branch conduit 35a against cargo or cargo/air mixture in the lower portion of the branch pipes 25a (25b), based on the pump pressure which is produced by the impeller 15 and the pulling along effect in the transition between the stripping pipe 28 and the associated branch conduit 25a (25b).
- a pair of branch conduits 35b are employed which extend from their respective suitable locations on the pump housing 16, for example downstream in the snail housing-shaped pump hous-ing 16, to the transition portion 37 of the stripping pipe 28.
- an effective air-lifting effect is obtained, based on an extra discharge upstream of the dis-charge pipe 26, in addition to the discharge via the opening 29 in the discharge pipe 26.
- a third construction as shown in Fig. 6, there is inserted in the transition portion 37 of the stripping pipe 28 an ejector or air siphon 38, which is operated as is shown by an arrow C, with internal drive medium, that is to say is operated with air or inert gas which is supplied under pressure from the upper portion 26c of the discharge pipe 26 via the transition portion 26a of the discharge pipe 26 to the stripping pipe 28.
- the ejector 38 is shown connected to the branch conduits 35a according to the first construction of Fig. 4, but the ejector 38 can just as well be connected to the branch conduit 35b, according to the second construction of Fig. 5 in a manner not shown further.
- connection pipe connection 28a (Fig. 6) of the stripping pipe 28 via the intake opening 29 to the discharge pipe 26 is omitted.
- the internal drive medium is forced via the discharge branch pipes 25a,25b from below and upwards through the branch pipes 35a.
- the cargo or the cargo/air mixture is pulled along from the diffuser portion 36 in the branch pipes 25a,25b via the branch conduits 35a and the ejector 38 inwardly into the stripping pipe 28.
- ejector 38 is shown connected to the branch conduits 35a according to the first construction of Fig. 4, but the ejector 38 can just as well be connected jointly to a pair of branch conduits 35b as shown in Fig. 5.
- a fifth construction in which air-lifting ("air lifting") is employed with an external air injection via a supply conduit 39, which has a nozzle 40 directed axially upwards through the stripping pipe 28.
- air lifting air lifting
- the solution is adapted for two stripping outlets 41a,41b via their respective branch conduits 35b' and 35c' with each stripping outlet arranged in each respective branch pipe 25a,25b.
- Fig. 10 equipment which can be connected up at the upper end of the stripping pipe 28 in combination with an arbitrary one of the constructions according to Fig. 3 - 9.
- a branch conduit 42 is shown, one end 42a of which is coupled to the stripping pipe 28 between the inlet 29 (Figs. 4 and 5) and the closing valve 30.
- a closing valve 43 is inserted together with an ejector 44 or second vacuum source which is supplied drive air/drive gas, as shown by the arrow D.
- the said second vacuum source can for example be formed by a vacuum tank.
- the vacuum tank can by way of example be formed in the discharge conduit itself between the valve 27 and a manifold not shown further.
- the mixture of drive gas and cargo or cargo/air mixture is delivered to a discharge tank not shown further, as indicated by an arrow E or alternatively via a branch conduit 45 to the discharge pipe 26 downstream of the valve 27, controlled via a three-way valve 46.
- the three-way valve 46 By adjusting the three-way valve 46 the afore-mentioned mixture can be delivered as required directly to the discharge pipe 26 downstream of the closing valve 27 or to the discharge tank as indicated by the arrow E.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Ocean & Marine Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Description
Claims (8)
- Discharge pump (14) arrangement, which is submersible in the cargo of a cargo tank (10) of a ship and which has a pump inlet (13) arranged in or by a well (12) of the ship's cargo tank (10), where impeller (15) of the pump is equipped with an extra pump arrangement (33,34), which is operatively connected to impeller (15) of the pump (14), and where discharge pipe (26) of the discharge pump (14) over deck (22) of the ship is equipped with a closing valve (27) and below the closing valve (27) via an intake (32) a compressed air or compressed gas supply (33) is coupled and also between the closing valve (27) and the discharge pump (14) an outlet (29;41a,41b) is coupled to a stripping pipe (28) having an associated closing valve (31) relative to a delivery location (A,E) via upper deck (22) of the ship, characterised in thatan extra pump arrangement is arranged on impeller (15) of the pump (14) in the form of opposite pairs of locally defined blades (33,34), which are disposed downstream just within inlet (13) of the pump (15),that the stripping pipe (28) communicates with the pump housing (16) or the lower portion of the discharge pipe (26) at a first height level at the upstream end of the stripping pipe (28), where the stripping pipe (28) is supplied with extra pressure medium internally via the discharge pipe (26), andthe stripping pipe (28) communicates at least at a second height level substantially above the first height level with an internal and/or external pressure medium or vacuum source for the supply of extra pressure medium or vacuum to the stripping pipe (28).
- Arrangement in accordance with claim 1,
characterised in thatat its upstream end the stripping pipe (28) is branched via two separate stripping branch conduits (35a;36b), which communicate via their respective lower intake openings directly with pump housing (16) of the pump (14),the intake openings from the pump housing having in part applied thereon the pressure from impeller (15) of the pump (14) and in part applied thereon the pressure from the pressure medium, which is supplied from the discharge pipe (26) via branch pipes (25a,25b) to the pump housing (16),while the stripping branch conduits (35a;35b) are subjected via a branching point for the stripping pipe (28) to a suction effect or pulling along effect produced by the internal and/or the external supply of pressure medium. - Arrangement in accordance with claim 1,
characterised in thatat its upstream end the stripping pipe (28) is branched via two separate stripping branch conduits (35a;36b), which communicate with pump housing (16) of the pump (14) via their respective lower intake openings in their respective branch pipes (25a,25b) which connect the pump housing (16) to the discharge pipe (28),the intake openings having in part applied thereon the pressure from impeller (15) of the pump (14) and in part applied thereon the pressure from the pressure medium, which is supplied from the discharge pipe (26) via the branch pipes (25a,25b) to the pump housing (16),while the branch conduits (35a;35b) are subjected via a branching point for the stripping pipe (28) to a suction effect or pulling along effect produced by an internal and/or external supply of pressure medium. - Arrangement in accordance with claim 2 or 3,
characterised in thatthe stripping pipe (28) is connected to the branch conduits (35a;35b) downstream of a separate conduit connection (28a) between the discharge pipe (26) and the stripping pipe (28),the separate conduit connection (28a) having an intake opening connected to a transition portion (26a) between the discharge pipe (26) and its branch pipes (25a,25b). - Arrangement in accordance with claim 2 or 3,
characterised in thatthe stripping pipe (28) is connected to the discharge pipe (26) via two parallel branch pipes via a respective one branch pipe (25a,25b) and a respective one branch conduit (35a;35b). - Arrangement in accordance with claim 4 or 5,
characterised in thatthe branch conduits (35a,35b) are connected at their downstream end, that is to say at their transition to the common stripping pipe (28), to a common suction path in an ejector (air-siphon 38), the exhaust of which empties directly into the stripping pipe (28), the drive medium path of the ejector (38) being connected to the internal or the external supply of pressure medium. - Arrangement in accordance with claim 4 or 5,
characterised in thatan air lifting arrangement in the form of a co-current directed nozzle having an external supply of pressure medium is inserted in the stripping pipe (28), in or downstream of the transition portion between the branch conduits (35a,35b) and the common stripping pipe (28). - Arrangement in accordance with one of the claims 1 - 7,
characterised in thatthe stripping pipe (28) communicates with a vacuum source at the downstream end of the stripping pipe (28).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO953132 | 1995-08-10 | ||
NO953132A NO300964B1 (en) | 1995-08-10 | 1995-08-10 | Device by unloading pump submerged in the cargo in a ship cargo tank |
PCT/NO1996/000204 WO1997006050A1 (en) | 1995-08-10 | 1996-08-09 | Cargo discharging pump |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0844961A1 EP0844961A1 (en) | 1998-06-03 |
EP0844961B1 true EP0844961B1 (en) | 1999-05-12 |
Family
ID=19898462
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96926672A Expired - Lifetime EP0844961B1 (en) | 1995-08-10 | 1996-08-09 | Cargo discharging pump |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0844961B1 (en) |
AU (1) | AU6672496A (en) |
NO (1) | NO300964B1 (en) |
WO (1) | WO1997006050A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NO972359A (en) * | 1997-05-23 | 1998-03-09 | Frank Mohn Fusa As | Device for unloading pump that is submersible in the cargo in a ship cargo tank |
JP4382111B2 (en) * | 2007-04-27 | 2009-12-09 | 株式会社新来島どっく | Cargo pump equipment for liquid cargo ship |
KR100992223B1 (en) * | 2008-07-01 | 2010-11-05 | 에스티엑스메탈 주식회사 | Suction Well of Submerged Cargo Pump System |
NO20150152A1 (en) * | 2015-02-03 | 2016-02-08 | Vitallic As | Device and Method for Emptying Cargo from a Tank |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3588280A (en) * | 1969-08-19 | 1971-06-28 | Shmariahu Yedidiah | Inducers for centrifugal pumps |
DE2545736A1 (en) * | 1975-10-11 | 1977-04-21 | Albert Blum | Immersible centrifugal pump with bottom inlet - has rotating element projecting to outside from shaft or impeller through inlet orifice |
NO160766C (en) * | 1982-09-21 | 1991-12-24 | Thune Eureka As | STRIP SYSTEM FOR A LOAD TANK. |
NO174460C (en) * | 1992-01-28 | 1996-09-17 | Mohn Fusa As Frank | Method and arrangement for emptying a liquid residue from the bottom of a tank |
NO178244B (en) * | 1993-10-18 | 1995-11-06 | Mohn Fusa As Frank | Device by unloading pump submerged in the cargo in a ship cargo tank |
-
1995
- 1995-08-10 NO NO953132A patent/NO300964B1/en not_active IP Right Cessation
-
1996
- 1996-08-09 WO PCT/NO1996/000204 patent/WO1997006050A1/en active IP Right Grant
- 1996-08-09 EP EP96926672A patent/EP0844961B1/en not_active Expired - Lifetime
- 1996-08-09 AU AU66724/96A patent/AU6672496A/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
NO300964B1 (en) | 1997-08-25 |
EP0844961A1 (en) | 1998-06-03 |
AU6672496A (en) | 1997-03-05 |
NO953132D0 (en) | 1995-08-10 |
NO953132L (en) | 1997-02-11 |
WO1997006050A1 (en) | 1997-02-20 |
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