EP0879966A1 - Tauchpumpenaggregat für flüssige Ladung in einem Frachtschiff - Google Patents

Tauchpumpenaggregat für flüssige Ladung in einem Frachtschiff Download PDF

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Publication number
EP0879966A1
EP0879966A1 EP98850085A EP98850085A EP0879966A1 EP 0879966 A1 EP0879966 A1 EP 0879966A1 EP 98850085 A EP98850085 A EP 98850085A EP 98850085 A EP98850085 A EP 98850085A EP 0879966 A1 EP0879966 A1 EP 0879966A1
Authority
EP
European Patent Office
Prior art keywords
pump
pipe
stripping
outlet
housing
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.)
Granted
Application number
EP98850085A
Other languages
English (en)
French (fr)
Other versions
EP0879966B1 (de
Inventor
Erik Dalen
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.)
Framo Fusa AS
Original Assignee
Frank Mohn Fusa AS
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Filing date
Publication date
Application filed by Frank Mohn Fusa AS filed Critical Frank Mohn Fusa AS
Publication of EP0879966A1 publication Critical patent/EP0879966A1/de
Application granted granted Critical
Publication of EP0879966B1 publication Critical patent/EP0879966B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the present invention relates to an arrangement of an unloading pump, which is submersible in the cargo in the cargo tank of a ship and which has a pump inlet arranged in or by a well in the bottom of the tank, where the pump comprises a main pump and an auxiliary pump, which is drive-connected to the impeller of the main pump, and where the discharge pipe of the pump is equipped with a closing valve and at least a regulating valve for the supply of (inert) pressure gas to the discharge pipe, the discharge pipe communicating via an upstream outlet with a stripping pipe, which communicates via an additional regulating valve with a downstream delivery location.
  • the pump according to the invention is in practice of a corresponding submersible type and has corresponding caulking and a corresponding mode of operation to that which is illustrated and described in NO 123 115.
  • cargo residues can be pressed by means of pressure gas, that is to say inert gas, from the discharge pipe via the stripping pipe to a desired delivery location in connection with a stripping function which follows a terminal unloading operation.
  • pressure gas that is to say inert gas
  • the submerged unloading pump in the form of a hydraulic unloading pump it is possible to unload the cargo optimally with step-free capacity control of all kinds of cargo.
  • an unloading pump in the form of an elongate, rigid pump arrangement, which is easily demountable, that is to say for one thing readily submergible or upwardly hoistable relative to the well at the bottom of the cargo tank.
  • a pump impeller is employed, 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 by the bottom of the ship's cargo tank.
  • the inlet to the pump is defined between the bottom of the cargo tank and the opposite lower portion of the pump arrangement.
  • the distance between the under side of the pump arrangement and the bottom of the well of the cargo tank is adapted according to the cross-section of the flow through the pump. Normally the unloading pump can empty the cargo to a level at the under side of the pump arrangement. Consequently there remains behind a first cargo residue in the well, that is to say at the level below the under side of the pump arrangement, together with a second cargo residue remaining within the pump itself.
  • the aim is to arrange the conditions so that there can be removed the largest possible quantity of the cargo residues which have had to remain in the pump arrangement after the conclusion of the usual unloading operation.
  • stripping arrangements have been employed, corresponding to the stripping arrangement which is applied according to the invention.
  • Such stripping arrangements operate partially together with and partially independently of the unloading pump.
  • By means of such stripping arrangements it has been possible to effect the cleaning in a controlled accurate and effective manner together with the unloading pump.
  • the present invention takes particular aim to apply a stripping technique known per se for removing the residues of cargo from the pump and during this remedy the problem with balancing the pressure conditions at the outlet to the stripping pipe, including the supply of inert gas and the supply of pressure medium from the impeller of the pump.
  • an auxiliary pump which projects a distance below the under side of the impeller of the main pump and which delivers pump medium to a level above the under side of the impeller of the main pump.
  • the aim is to fetch out the pump medium from a lower level in the discharge pipe than proposed according to the afore-mentioned patent application 960318.
  • This involves certain problems in connection with the conditions of flow occurring in the gas/fluid mixture in the snail housing-formed passage portions of the pump housing and following from this, pressure conditions specifically occurring in and at the pump housing.
  • the pressure conditions in and at the pump housing are influenced to a decisive degree by the excess pressures which arise in the discharge pipe in front of the closing valve or in the discharge pipe behind the closing valve.
  • the aim is to relieve the afore-mentioned problems.
  • the arrangement according to the present invention is characterised in that the outlet of the stripping pipe, which is arranged at a first, lower height level, communicates with the discharge pipe just by the pump housing or with the pump housing in the snail housing-formed discharge portion of the pump housing, and that the stripping pipe is equipped at a second height level just above the first height level with a diffusor for the generation of an extra pressure in the upstream end of the stripping pipe downstream of the diffusor.
  • the speed is reduced by virtue of an increase of the cross-section.
  • the reduced speed causes the pressure to rise, the product of the pressure and the speed being approximately constant.
  • a pressure-controlled inlet of pump medium can be ensured from the low level in the pump arrangement to the stripping pipe in a simple and ready manner, in spite of the excess pressure which prevails beforehand partly in the discharge pipe of the pump upstream relative to the stripping pipe and partly in the stripping pipe downstream of the diffusor.
  • the pump arrangement according to the invention is further characterised in that the stripping pipe communicates only with the one of two separate branch pipes of the discharge pipe from the snail housing-formed discharge portion of the pump housing.
  • Fig. 1 shows schematically a pump arrangement according to the invention submerged in the cargo of a ship's tank, illustrated in connection with a usual unloading operation.
  • Fig. 1a - 1c show different stripping phases in continuation of the unloading operation as indicated in Fig. 1.
  • Fig. 2 shows in side view a section of a lower portion of the pump arrangement according to Fig. 1.
  • Fig. 3 shows in vertical section the pump rotor of the pump arrangement and illustrates in addition details according to the present invention.
  • Fig. 4 shows in a side view, correspondingly as shown in Fig. 2, an alternative placement of the outlet from the discharge pipe to the stripping pipe.
  • Fig. 5 shows in a side view correspondingly as shown in Fig. 2, a further construction with the alternative placement of the outlet from the discharge pipe to the stripping pipe.
  • the pump according to the present invention is of a corresponding submersible type and has corresponding caulking and a corresponding mode of operation to that which is illustrated and described in NO 123 115.
  • a cargo tank 10 is shown in a ship, where the bottom 11 of the tank 10 is illustrated, which is equipped with locally defined tank well 12, in which there is submerged a lower end of a pump 14, that is to say inlet end 13 of the pump 14.
  • the pump 14 is adapted to operate submerged in the cargo in the tank 10 in a relatively free downwardly hanging condition, with local, centering side supports, not shown further, which are arranged at suitable height levels in the cargo tank, for example along the one tank wall 10b.
  • the tank well 12 is given an optimal design with respect to the collection of and flow of cargo to the pump.
  • the well 12 is given a concavely rounded form, such as shown in Fig. 2.
  • weight is placed on the usual unloading operation taking place under optimal conditions and the remaining, following operations having to be adapted to existing unloading equipment.
  • the stripping operation is consequently undertaken in a manner which is adapted to the equipment and the arrangement which is used in the preceding unloading operation.
  • a pump 14 is shown in the form of a main pump 14a and an auxiliary pump 14b.
  • the main pump 14a comprises an impeller 15, which is received in a snail housing-like pump housing 16.
  • the auxiliary pump 14b is fastened in drive connection to impeller 15 of the main pump.
  • the pump housing 16 is freely axially movable relative to the well 12 and is centered relative to this by means of a combined support/guide ring and splash shield 16a, which is fastened with lugs 16b to bottom 11 of the tank 10 just by the tank well 12.
  • a combined support/guide ring and splash shield 16a which is fastened with lugs 16b to bottom 11 of the tank 10 just by the tank well 12.
  • an inverted funnel-shaped guide shield fastened to the pump housing 16 just beneath the lower edge 15a of the impeller 15.
  • the impeller 15 is driven via a short drive shaft 17 by means of a high pressure hydraulic drive motor.
  • the drive motor is connected to a remotely disposed source of pressure medium (not shown) via a coupling means 19 on the 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 the deck 22 of the ship.
  • the supply and discharge conduits in the illustrated embodiment are surrounded by a common shield pipe 23, while the drive motor is surrounded by an outer shield housing 24, in order to prevent any form of leakage of drive medium into the cargo, and vice versa , such as shown in NO 123 115.
  • the combination of main pump and auxiliary pump is moreover based on a corresponding arrangement as illustrated in NO patent application 960318.
  • the discharge pipe 26 and the shield pipe 23 of the hydraulic supply and discharge conduits separately pass through the cover 20.
  • the discharge pipe 20 extends further to a suitable discharge location, as shown by an arrow A, on deck 22 of the ship.
  • a first closing valve 27 which is closed on the termination of the usual unloading operation.
  • the discharge pipe 26 becomes hereby closed off into two separate portions 26',26", comprising a first portion, that is to say an upstream portion 26', which is mainly arranged in the cargo tank 10, and a second portion, that is to say a downstream portion 26b, which is arranged over deck 22 of the ship.
  • On turning off the valve 27 a certain amount of cargo is thereby held back in the discharge pipe 26 on the upstream side of the valve 27 in the pipe portion 26' to just above the impeller 15.
  • Fig. 1 the pipe portion 26" is shown in the form of a three branched conduit comprising a first, upper, horizontal section 26b, a second, lower horizontal section 26c and a third, lower horizontal section 26d, which join in a T-shaped connection.
  • the first section 26b is defined relative to the pipe portion 26' by means of the first closing valve 27.
  • the second section 26c is defined by means of a second closing valve 30 relative to a reject tank or like delivery location, as shown by an arrow B.
  • the third section 26d is defined by means of a third closing valve 31 relative to a goose neck-formed discharge section, which extends to the delivery location, as shown by the arrow A.
  • first section 26b is branched off via a T-shaped transition portion with a vertical branch portion 32 and two horizontal branch portions 33,34.
  • the branch portion 33 is adapted to communicate with a source of pressure gas, that is to say an inert gas source, as indicated by an arrow C, while the branch portion 34 is adapted to communicate with the stripping pipe 28.
  • a first regulating valve 35 is arranged in the branch portion 32, a second regulating valve in the branch portion 33 and a third regulating valve 37 in the branch portion 34.
  • the cargo residue which remains behind in the portion 26" is removed separately to a remotely disposed discharge location, as indicated by the arrow A, by opening the valves 35 and 37 and pressing the cargo residue to the discharge location by means of inert gas.
  • the impeller 15 will provide for a sufficient pump pressure against the cargo residue in the pipe portion 26', in order to counteract emptying of this cargo residue back to the tank well 12.
  • the cargo residue which remains behind in the pipe portion 26' when the valve 27 is closed, or the cargo residue, which remains behind in the tank well 12, is thereafter removed by means of a stripping operation.
  • auxiliary pump 14b In order to supply extra cargo residue from the well 12 to the impeller 15 of the main pump 14a provision is made for said auxiliary pump 14b to project downwards in the well 12 a distance below impeller 15 of the main pump 14.
  • the auxiliary pump 14b is made with an especially simple construction and is manufactured from a plane steel plate, which is press-formed to a part-conical outline, As shown in Fig. 3 there is formed a part-conical casing having a substantially uniform wall thickness. In the finally fashioned casing there are drilled in the upper portion of the casing a number (for example six or seven) of flow through openings 18 (of which only two are shown in Fig. 3).
  • a number for example six or seven
  • the openings 18 extend obliquely upwards and outwards to a level above the lower portion 15a of the impeller 15, so that the pump medium which is delivered from the auxiliary pump 14a with certainty can be caught by impeller blades 15b of the main pump 14.
  • outlet 29 of the stripping pipe 28 is designed according to a first embodiment in a convexly curved portion 39 in the snail housing - formed pump housing, that is to say in a radially outer wall portion 40 of a housing portion which extends obliquely upwards in a helical contour. Consequently the outlet 29 is arranged in a portion of the pump housing 16 where the pump medium (gas/fluid mixture) is slung with great force radially outwards and obliquely upwards, by means of the feeding pressure from the impeller 15.
  • the outlet 29 is localised to a first level just above the impeller 15.
  • the outlet 29 is illustrated with a cross-sectional area, which is correspondingly large or larger than the internal pipe cross-section of the stripping pipe 28.
  • the outlet 29 can have a cross-sectional form deviating from the general cross-sectional form of the stripping pipe, and for example the outlet 29 can have a larger dimension in the lateral direction than in the height direction, or vice - versa , the cross-sectional form being dependent upon the exact placement in the snail housing-formed pump housing.
  • the stripping pipe 28 extends with a slightly curved contour 41 obliquely upwards to and through an anchoring plate 42. Just above the anchoring plate 42, that is to say at a second level above the first level a diffusor 44 is inserted in the stripping pipe 28.
  • the diffusor 44 is shown with a relatively short upstream portion 45 having an upwardly converging wall surface, a subsequent relatively short middle portion 46 having a cylindrical wall surface and an elongate downstream portion 47 having an upwardly diverging wall surface.
  • the pump medium achieves as a consequence of the local narrowing of the pipe cross-section in the upstream portion 45 an equivalent increase in the speed of movement in the transition portion 46 and simultaneously a pressure drop following from this. In the continuation there will be generated in the downstream portion 47 an extra pressure or an equivalently reduced speed of movement in the pump medium, as a consequence of the gradually increasing pipe cross-section in the portion 47.
  • the supply of inert gas from the valve 38 can be throttled.
  • the valve 36 is closed and the valve 37 is opened in order to blow the cargo residues from the downstream portion 26" to the discharge location as shown by the arrow A.
  • the pressure from the downstream portion 26" of the discharge pipe can be diverted to the tank 10 or to the discharge location A by means of an extra (not shown further) valve arranged in the downstream portion 26" of the discharge pipe 26.
  • FIG. 4 there is shown in an alternative construction an outlet 29' arranged at a somewhat higher level than the outlet 29 as shown in Fig. 2 and 3. More specifically the outlet 29' is placed in one branch pipe 25a of the discharge pipe 26 just above a flange joint 50 between upwardly curved portion 39 of the pump housing 16 and the branch pipe 25a flush therewith. Peripherally relative to the discharge pipe 26 the outlet is arranged vertically above the convexly curved portion 40 of the pump housing 16. Practical tests have shown that as regards arrangement an advantageous placement of the outlet 29' can be obtained, such as shown in Fig. 4, without this significantly influencing the emptying effect relative to that which is achieved according to the construction according to Fig. 2 and 3.
  • Fig. 4 there is indicated by arrows 51 a counterpressure which is exerted by inert gas, which is supplied from the upper end of the discharge pipe 26, for balancing the pressure of the pump medium which is generated by the impeller of the pump.
  • arrow 52 the flow direction of the pump medium is illustrated upwardly through the stripping pipe.
  • Fig. 5 there is illustrated a further alternative construction where the outlet 29' is arranged in the branch pipe 25a correspondingly as shown in Fig. 4.
  • the diffusor 44 is arranged closely up to the outlet 29' and extends relatively steeply upwards from the outlet 29', that is to say at a relatively acute angle to the adjacent branch pipe 25a, so that the stripped medium can be led relatively unhindered inwardly into the stripping pipe and be subjected to minimum deflection from the branch pipe 25a to the stripping pipe 28'.

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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)
EP98850085A 1997-05-23 1998-05-20 Tauchpumpenaggregat für flüssige Ladung in einem Frachtschiff Expired - Lifetime EP0879966B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO972359A NO302461B1 (no) 1997-05-23 1997-05-23 Anordning ved lossepumpe som er neddykkbar i lasten i en skipslastetank
NO972359 1997-05-23

Publications (2)

Publication Number Publication Date
EP0879966A1 true EP0879966A1 (de) 1998-11-25
EP0879966B1 EP0879966B1 (de) 2000-02-23

Family

ID=19900739

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98850085A Expired - Lifetime EP0879966B1 (de) 1997-05-23 1998-05-20 Tauchpumpenaggregat für flüssige Ladung in einem Frachtschiff

Country Status (2)

Country Link
EP (1) EP0879966B1 (de)
NO (1) NO302461B1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101038422B1 (ko) 2009-06-15 2011-06-01 주식회사 언딘 수중 침몰체의 오염물질 회수 장치 및 방법
GB2481316A (en) * 2010-06-18 2011-12-21 Frank Mohn Fusa As Self-priming pump
CN109466702A (zh) * 2018-12-21 2019-03-15 南京盛航海运股份有限公司 液货船舶残液收集系统
CN109533223A (zh) * 2019-01-02 2019-03-29 烟台龙港泵业股份有限公司 一种立式双管路自动扫舱泵装置
CN113606390A (zh) * 2021-07-21 2021-11-05 上海外高桥造船有限公司 一种隔离装置、便携泵系统及其组装方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997006050A1 (en) * 1995-08-10 1997-02-20 Frank Mohn Fusa A/S Cargo discharging pump

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997006050A1 (en) * 1995-08-10 1997-02-20 Frank Mohn Fusa A/S Cargo discharging pump

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Liquid cargo handling - a trend towards submerged pumps", THE MOTOR SHIP, vol. 68, no. 810, 1 January 1988 (1988-01-01), pages 40 - 41, XP002075796 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101038422B1 (ko) 2009-06-15 2011-06-01 주식회사 언딘 수중 침몰체의 오염물질 회수 장치 및 방법
GB2481316A (en) * 2010-06-18 2011-12-21 Frank Mohn Fusa As Self-priming pump
GB2481316B (en) * 2010-06-18 2013-07-31 Frank Mohn Fusa As Pump assembly and method for conducting a pumping operation
CN109466702A (zh) * 2018-12-21 2019-03-15 南京盛航海运股份有限公司 液货船舶残液收集系统
CN109466702B (zh) * 2018-12-21 2024-02-20 南京盛航海运股份有限公司 液货船舶残液收集系统
CN109533223A (zh) * 2019-01-02 2019-03-29 烟台龙港泵业股份有限公司 一种立式双管路自动扫舱泵装置
CN113606390A (zh) * 2021-07-21 2021-11-05 上海外高桥造船有限公司 一种隔离装置、便携泵系统及其组装方法

Also Published As

Publication number Publication date
EP0879966B1 (de) 2000-02-23
NO972359A (no) 1998-03-09
NO302461B1 (no) 1998-03-09
NO972359D0 (no) 1997-05-23

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