Cargo pump apparatus for liquid cargo ship

Abstract

 A cargo pump apparatus is suitable for liquid cargo ships required to carry six to eight types of cargo and having a plurality of holds partitioned by a central bulkhead standing upright on a lower longitudinal stool and transverse bulkheads. Each cargo pump room is provided at an intersecting portion of the central bulkhead and one of the transverse bulkheads, and penetrates a hatch provided on an upper deck and the lower longitudinal stool. One deep well pump is provided in each cargo pump room. The suction side of the deep well pump is connected to a cargo suction portion which has an open end in the hold and penetrates the inclined wall of the lower longitudinal stool. The discharge side of the deep well pump is connected to a cargo discharge pipe connected to a manifold pipe laid on the upper deck through the cargo pump room. Either the cargo suction portion in the cargo pump room is connected through an expansion pipe, or the deep well pump is secured through an expansion pipe.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

[0001] The present invention relates to cargo pump apparatuses and cargo pipes for liquid cargo ships, and more specifically, to a cargo pump apparatus and a cargo suction pipe used in a system for discharging a liquid cargo.

2. Description of the Related Art

[0002] To be capable of simultaneously unloading four types of cargo, liquid cargo ships which have four cargo pumps in a cargo pump room located between a cargo section and an engine room, a carrying capacity on the order of fifty thousand tons, and a main-branch cargo piping system have been built in recent years. Some liquid cargo ships have twelve or sixteen partitioned holds and an independent cargo pump (submerged pump) is installed in each hold.

[0003] A liquid cargo ship having an independent cargo pump in each hold is disclosed in Japanese Unexamined Patent Application Publication No. 2001-180576, for instance.

[0004] An object of the technology disclosed in Japanese Unexamined Patent Application Publication No. 2001-180576 is to provide a chemical cargo ship that can reduce the amount of a liquid chemical product remaining in the main line to zero immediately before the end of unloading. The chemical cargo ship is equipped with a cargo line for unloading liquid chemical products from a plurality of tanks disposed in the ship into facilities. To attain the above-described object, the cargo line includes a plurality of manifold crossover lines extending in a transverse direction in the vicinity of the center of the ship and connected to facilities at one end; a plurality of first main lines and second main lines extending toward the bow of the ship and toward the stern of the ship, respectively, on a level higher than the crossover lines and connected to the crossover lines at one end; and a plurality of branch lines having main parts extending in the vertical direction and lower ends mounted to a submerged pump, being inserted in the tank, and connected at least to either the other end or a midway position of the first and second main lines.

[0005] An overview of a cargo pump apparatus for a conventional liquid cargo ship represented by the liquid cargo ship disclosed in Japanese Unexamined Patent Application Publication No. 2001-180576 will be given with reference to Figs. 12 and 13. Fig. 12 shows a transverse cross-sectional view of holds of the conventional liquid cargo ship, and Fig. 13 shows an outline view of a transverse bulkhead portion of the holds of the conventional liquid cargo ship, viewed from an upper deck 23.

[0006] A manifold pipe 25 is laid on the upper deck 23 of the ship. The ship includes a total of twenty holds 11 from the bow to the stern, for storing liquid chemical products, such as methanol. Each hold is partitioned by a central bulkhead 13 and a transverse bulkhead 15, is disposed in pairs, and has a submerged pump 91.

[0007] Generally, the submerged pump 91 is an electric hydraulic pump containing a hydraulic motor in its lower part, and an impeller is provided below the motor. A float control for adjusting the amount of hydraulic flow is provided on a hatch 33 of the upper deck 23. The float control controls the amount of hydraulic flow. A discharge pipe 81 extends vertically from a side of the impeller and is connected to the manifold pipe 25 on the upper deck 23. The manifold pipe 25 branches out to a fill pipe 27.

[0008] A liquid cargo ship with twelve or sixteen partitioned holds rarely carries ten or more types of cargo and is generally required to carry six to eight types of cargo at most. Accordingly, if a pair of holds on the starboard side and on the port side, partitioned by the central bulkhead, do not store different types of cargo, submerged pumps separately provided there would be excessive. The pumps require separate control, increasing labor costs and equipment costs for maintenance.

SUMMARY OF THE INVENTION

[0009] Accordingly, it is an object of the present invention to provide a cargo pump apparatus suitable for liquid cargo ships required to carry six to eight types of cargo, the cargo pump apparatus being capable of reducing initial costs and running costs and avoiding cracks and noise caused by vibrations of the cargo pump.

[0010] To accomplish the above object, the present invention provides, according to a first aspect of the present invention, a cargo pump apparatus for a liquid cargo ship including a plurality of holds partitioned by a central bulkhead provided upright along a center line of the cargo ship and a plurality of transverse bulkheads provided upright at right angles to the central bulkhead, the central bulkhead standing upright on a lower longitudinal stool provided on an inner bottom plate of a double bottom, the lower longitudinal stool being almost isosceles-trapezoidal in cross section; a cargo pump room being provided at an intersecting portion of the central bulkhead and one of the transverse bulkheads, the cargo pump room connecting, along the central bulkhead, a hatch provided in an upper deck and the inside of the lower longitudinal stool; the cargo pump room being provided with a deep well pump and a residual collection apparatus; a suction side of the deep well pump being connected through a hydraulic valve to a cargo suction portion penetrating an inclined wall of the lower longitudinal stool, the cargo suction portion having an open end placed in a suction well recessed in the inner bottom plate of the hold; a discharge side of the deep well pump being connected to a cargo discharge pipe passing through the cargo pump room and connected to a manifold pipe laid on the upper deck; and the cargo suction portion in the cargo pump being connected through an expansion pipe, or the deep well pump being secured through an expansion joint.

[0011] According to a second aspect of the present invention, the cargo pump apparatus may be configured such that the deep well pump is disposed in the cargo pump room, and the cargo suction portion connected to the suction side of the deep well pump includes two or four suction pipes extending to two or four holds adjoining across the central bulkhead.

[0012] The cargo pump apparatus according to either the first aspect or the second aspect of the present invention may be configured such that the deep well pump includes a pump portion and a motor portion connected through a drive shaft; the motor portion is secured on the upper deck; the pump portion is enclosed by a suction casing comprising a lower flange provided in an upper part thereof, a cylindrical portion provided in a central part thereof, and a funnel-shaped portion connected to the cylindrical portion and having a narrow end at the bottom, and the pump portion is secured to an upper flange connected to the lower flange through the expansion joint; the upper flange is suspended from the hatch; and the cargo suction portion includes a T-shaped pipe connected to the lower end of the suction casing and two suction pipes connected to both ends of the T-shaped pipe through hydraulic valves, or the cargo suction portion includes a first T-shaped pipe connected to the lower end of the suction casing, two second T-shaped pipes connected to both ends of the first T-shaped pipe through straight pipes, and four suction pipes connected to both ends of the two second T-shaped pipes through hydraulic valves.

[0013] The cargo pump apparatus according to either the first aspect or the second aspect of the present invention may be configured such that the deep well pump includes a pump portion and a motor portion connected through a drive shaft; the hatch includes a lower hatch and an upper hatch placed on the lower hatch, with the expansion joint disposed therebetween; the motor portion is secured on the upper hatch; and the cargo suction portion includes a T-shaped pipe connected to the lower end of the pump portion and two suction pipes connected to both ends of the T-shaped pipe through hydraulic valves, or the cargo suction portion includes a first T-shaped pipe connected to the lower end of the pump portion, two second T-shaped pipes connected to both ends of the first T-shaped pipe through straight pipes, and four suction pipes connected to both ends of the two second T-shaped pipes through hydraulic valves.

[0014] The cargo pump apparatus according to either the first aspect or the second aspect of the present invention may be configured such that the deep well pump includes a pump portion and a motor portion connected through a drive shaft; the motor portion is secured on the hatch; the cargo suction portion includes a T-shaped pipe connected to the lower end of the pump portion and two suction pipes connected to both ends of the T-shaped pipe through hydraulic valves, or the cargo suction portion includes a first T-shaped pipe connected to the lower end of the pump portion, two second T-shaped pipes connected to both ends of the first T-shaped pipe through straight pipes, and four suction pipes connected to both ends of the two second T-shaped pipes through hydraulic valves; and each of the two or four suction pipes penetrating the inclined wall of the lower longitudinal stool is connected through the expansion pipe.

[0015] The cargo pump apparatus according to either the first aspect or the second aspect of the present invention may be configured such that the deep well pump includes a pump portion and a motor portion connected through a drive shaft; the motor portion is secured on the hatch; the cargo suction portion includes an L-shaped pipe connected to the lower end of the pump portion, a T-shaped pipe connected to the L-shaped pipe, and two suction pipes connected to both ends of the T-shaped pipe through hydraulic valves, or the cargo suction portion includes an L-shaped pipe connected to the lower end of the pump portion, a first T-shaped pipe connected to the L-shaped pipe, two second T-shaped pipes connected to both ends of the first T-shaped pipe, and four suction pipes connected to both ends of the two second T-shaped pipes; and the L-shaped pipe is an L-shaped expansion pipe formed of the expansion pipe.

[0016] The cargo pump apparatus according to either the first aspect or the second aspect of the present invention may be configured such that the deep well pump includes a pump portion and a motor portion connected through a drive shaft; the motor portion is secured on the hatch; the cargo suction portion includes an L-shaped pipe connected to the lower end of the pump portion, a T-shaped pipe connected to the L-shaped pipe, and two suction pipes connected to both ends of the T-shaped pipe through hydraulic valves, or the cargo suction portion includes an L-shaped pipe connected to the lower end of the pump portion, a first T-shaped pipe connected to the L-shaped pipe, two second T-shaped pipes connected to both ends of the first T-shaped pipe, and four suction pipes connected to both ends of the two second T-shaped pipes; and either the L-shaped pipe and the T-shaped pipe or the L-shaped pipe and the first T-shaped pipe are connected through the expansion pipe. the deep well pump includes a pump

[0017] The cargo pump apparatus according to either the first aspect or the second aspect of the present invention may be configured such that the deep well pump includes a pump portion and a motor portion connected through a drive shaft; the motor portion is secured on the hatch; the cargo suction portion includes a first T-shaped pipe connected to the lower end of the pump portion, two second T-shaped pipes connected to both ends of the first T-shaped pipe through straight pipes, and four suction pipes connected to both ends of the two second T-shaped pipes through hydraulic valves; and each of the straight pipes is connected through the expansion pipe.

[0018] According to the structures described above, the present invention has the following advantages:

(1) One deep well pump for use as a cargo pump is disposed for each pair of holds adjoining across the central bulkhead or for a set of four holds adjoining the cargo pump room, so that each hold block formed of two holds facing each other across the central bulkhead or each hold block formed of four holds adjoining the cargo pump room can store one type of cargo. Therefore, as many types of liquid cargo as hold blocks can be stored.

(2) Because a cargo pump is not required for each hold, the number of cargo pumps can be halved or quartered, and initial costs and running costs can be reduced accordingly. In addition, the deep well pump used as the cargo pump is easy to maintain.

(3) A cargo suction portion in the cargo pump room is connected through an expansion pipe, or the deep well pump is connected through an expansion joint, so that expansion and contraction of the cargo suction portion caused by the pump or the motor of the deep well pump can be absorbed by the expansion pipe or the expansion joint. Accordingly, noise and cracks in the ship, such as the wall of the lower longitudinal stool, the wall of the cargo pump room, the central bulkhead, and the transverse bulkheads, caused by the vibrations of the cargo pump, can be avoided.

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 

Fig. 1 is a transverse cross-sectional view of holds related to a cargo pump apparatus of a first embodiment and a residual collection apparatus attached thereto.

Fig. 2 is a partial plan view of the holds related to the cargo pump apparatus of the first embodiment and the residual collection apparatus attached thereto.

Fig. 3 is a transverse cross-sectional view of the holds related to the cargo pump apparatus of the first embodiment.

Fig. 4 is an enlarged view of a suction casing portion of the cargo pump apparatus of the first embodiment.

Fig. 5 is a transverse cross-sectional view of holds related to a cargo pump apparatus of a second embodiment.

Fig. 6 is an enlarged view of a hatch portion of the cargo pump apparatus of the second embodiment.

Fig. 7 is a transverse cross-sectional view of holds related to a cargo pump apparatus of a third embodiment.

Fig. 8 is an enlarged view of a cargo suction portion of the cargo pump apparatus of the third embodiment.

Fig. 9 is an enlarged view of a cargo suction portion of a cargo pump apparatus of a fourth embodiment.

Fig. 10 is an enlarged view of a cargo suction portion of a cargo pump apparatus of a fifth embodiment.

Fig. 11 is an enlarged view of a cargo suction portion of a cargo pump apparatus of a sixth embodiment.

Fig. 12 is a transverse cross-sectional view of holds of a conventional liquid cargo ship.

Fig. 13 is an outline view of a transverse bulkhead portion of the holds of the conventional liquid cargo ship, viewed from an upper deck.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] First to sixth preferred embodiments of the present invention will be described below with reference to Figs. 1 to 11. Fig. 1 is a transverse cross-sectional view of holds related to a cargo pump apparatus of a first embodiment and a residual collection apparatus attached thereto. Fig. 2 is a partial plan view of the holds related to the cargo pump apparatus of the first embodiment and the residual collection apparatus attached thereto. Fig. 3 is a transverse cross-sectional view of the holds related to the cargo pump apparatus of the first embodiment. Fig. 4 is an enlarged view of a suction casing portion of the cargo pump apparatus of the first embodiment. Fig. 5 is a transverse cross-sectional view of holds related to a cargo pump apparatus of a second embodiment. Fig. 6 is an enlarged view of a hatch portion of the cargo pump apparatus of the second embodiment. Fig. 7 is a transverse cross-sectional view of holds related to a cargo pump apparatus of a third embodiment. Fig. 8 is an enlarged view of a cargo suction portion of the cargo pump apparatus of the third embodiment. Fig. 9 is an enlarged view of a cargo suction portion of a cargo pump apparatus of a fourth embodiment. Fig. 10 is an enlarged view of a cargo suction portion of a cargo pump apparatus of a fifth embodiment. Fig. 11 is an enlarged view of a cargo suction portion of a cargo pump apparatus of a sixth embodiment.

[0021] In Figs. 1 to 11, reference numeral 1 denotes the cargo pump apparatus of the first embodiment; reference numeral 2 denotes the cargo pump apparatus of the second embodiment; reference numeral 3 denotes the cargo pump apparatus of the third embodiment; reference numeral 4 denotes the cargo pump apparatus of the fourth embodiment; reference numeral 5 denotes the cargo pump apparatus of the fifth embodiment; reference numeral 6 denotes the cargo pump apparatus of the sixth embodiment; reference numeral 11 denotes holds; reference numeral 13 denotes a central bulkhead; reference numeral 15 denotes transverse bulkheads; reference numeral 17 denotes an inner bottom plate; reference numeral 19 denotes a lower longitudinal stool; reference numeral 191 denotes a lower-longitudinal-stool inclined wall; reference numeral 21 denotes a suction well; reference numeral 23 denotes an upper deck; reference numeral 25 denotes a manifold pipe; reference numeral 27 denotes a fill pipe; reference numeral 31 denotes a cargo pump room; reference numeral 33 denotes a hatch; reference numeral 331 denotes an upper hatch; reference numeral 333 denotes a lower hatch; reference numeral 335 denotes a hatch expansion joint; reference numeral 40 denotes a deep well pump; reference numeral 41 denotes a pump portion; reference numeral 43 denotes a motor portion; reference numeral 45 denotes a drive shaft; reference numeral 51 denotes a cargo suction portion of the first embodiment; reference numeral 52 denotes a cargo suction portion of the second embodiment; reference numeral 53 denotes the cargo suction portion of the third embodiment; reference numeral 54 denotes the cargo suction portion of the fourth embodiment; reference numeral 55 denotes the cargo suction portion of the fifth embodiment; reference numeral 56 denotes the cargo suction portion of the sixth embodiment; reference numeral 57 denotes suction pipes; reference numeral 59 denotes expansion pipes; reference numeral 61 denotes suction-portion hydraulic valves; reference numeral 63 denotes a T-shaped pipe; reference numeral 631 denotes a first T-shaped pipe; reference numeral 632 denotes second T-shaped pipes; reference numeral 65 denotes an L-shaped pipe; reference numeral 67 denotes an L-shaped expansion pipe; reference numeral 70 denotes a suction casing portion; reference numeral 71 a cylindrical portion; reference numeral 73 denotes a funnel-shaped portion; reference numeral 75 denotes a lower flange; reference numeral 77 denotes an upper flange; reference numeral 79 denotes a flange expansion joint; reference numeral 81 denotes a cargo discharge pipe; reference numeral 83 denotes a residual suction pipe; reference numeral 85 denotes a residual collection pump; and reference numeral 87 denotes a residual discharge pipe. The center line of the cargo ship is denoted as CL in the figures. Elements identical to the elements of the cargo pump apparatus of the conventional cargo ship described with reference to Figs. 12 and 13 are given the same reference numerals.

First embodiment

[0022] An overview of the cargo pump apparatus of the first embodiment and the residual collection apparatus attached thereto will be described first with reference to Figs. 1 and 2. Then, the cargo pump apparatus of the first embodiment will be described with reference to Figs. 3 and 4.

[0023] In Fig. 2, the upper portion of the figure corresponds to the bow side, and the lower portion of the figure corresponds to the stern side. As shown in Fig. 2, holds 11 are partitioned in a water-tight manner by a central bulkhead 13 provided upright along the center line CL of the cargo ship and a plurality of transverse bulkheads 15 provided upright at right angles to the central bulkhead 13. The central bulkhead 13 and the transverse bulkheads 15 stand upright respectively on a lower longitudinal stool 19 and lower transverse stools provided on inner bottom plates 17, the stools being almost isosceles-trapezoidal in cross section, and the central bulkhead 13 and the transverse bulkheads 15 have corrugated structures.

[0024] Each cargo pump room 31 is provided in a water-tight manner at an intersecting area of a transverse bulkhead 15 and the central bulkhead 13 on the stern side of a pair of holds 11 on the port side and on the starboard side, adjoining across the central bulkhead 13, the cargo pump room 31 penetrating an upper deck 23 and the lower longitudinal stool 19. A hatch 33 stands on the upper deck 23 located above the cargo pump room 31. The cargo pump room 31 has walls parallel to the central bulkhead 13 and the transverse bulkhead 15 and has a narrow rectangular shape along the center line CL of the cargo ship in a top view, but the shape is not limited to the shape mentioned above.

[0025] The residual collection apparatus is attached in common to the cargo pump apparatus 1 to cargo pump apparatus 6 of the first to sixth embodiments. The residual collection apparatus will be described first with reference to Fig. 1.

[0026] In each cargo pump room 31, the residual collection apparatus principally includes one residual collection pump 85, two residual suction pipes 83 connected to the suction side of the residual collection pump 85, and one residual discharge pipe 87 connected to the discharge side of the residual collection pump 85. A self-priming pump is used as the residual collection pump 85. A T-shaped pipe is connected to the suction side of the residual collection pump 85; the residual suction pipes 83, having a diameter of about 50 mm, are connected to both ends of the T-shaped pipe; and hydraulic valves are inserted between the T-shaped pipe and the residual suction pipes 83. Each residual suction pipe 83 penetrates a lower-longitudinal-stool inclined wall 191 and extends to the inside of each hold of the pair of holds 11 adjoining across the central bulkhead 13, and its open end is placed in a suction well 21 recessed in an inner bottom plate 17 of the hold 11.

[0027] The residual discharge pipe 87, connected to the discharge side of the residual collection pump 85, extends upward in the cargo pump room 31, penetrates the upper deck 23, and is connected to a manifold pipe 25 laid on the upper deck 23.

[0028] The residual collection apparatus structured as described above plays the role of collecting any cargo that could not be collected by the cargo pump apparatus 1, which will be described later. The residual suction pipes 83 have a small diameter of about 50 mm, and the residual collection pump 85 is self-priming.

[0029] Each hold 11 is provided with a fill pipe 27 branching off from the manifold pipe 25, and cargo is supplied by the fill pipe 27, as in the conventional cargo transport ship.

[0030] In each cargo pump room 31, the cargo pump apparatus 1 principally includes one deep well pump 40, a cargo suction portion 51 connected to the suction side of the deep well pump 40, and a cargo discharge pipe 81 connected to the discharge side of the deep well pump 40.

[0031] The deep well pump 40 includes a motor portion 43 and a pump portion 41 connected to the motor portion 43 through a drive shaft 45. The motor portion 43 is secured on the hatch 33, and the pump portion 41 is contained in a suction casing portion 70 supported by the hatch 33 in a lower part of the cargo pump room 31. The suction casing portion 70 has a lower flange 75 in its upper part, a cylindrical portion 71 in its middle part, and a funnel-shaped portion 73 which is connected to the cylindrical portion 71 and has a narrow end at the bottom. The pump portion 41 is secured to an upper flange 77 connected to the lower flange 75 through a flange expansion joint 79, and the upper flange 77 is secured to the hatch 33. Accordingly, the suction casing portion 70 is supported by the hatch 33.

[0032] The flange expansion joint 79 of the first embodiment is of a bellows type having elasticity, air tightness, and spring properties, formed by concertinaing a metal tube.

[0033] The cargo suction portion 51 is connected to the lower end portion of the suction casing portion 70. The cargo suction portion 51 includes a T-shaped pipe 63 connected directly to the lower end portion of the suction casing portion 70, and two suction pipes 57 connected to both ends of the T-shaped pipe 63 through suction-portion hydraulic valves 61. Each suction pipe 57 penetrates the lower-longitudinal-stool inclined wall 191 and extends to the inside of each hold of the pair of adjoining holds 11, and its open end is placed in the suction well 21 recessed in the inner bottom plate 17 of the hold 11.

[0034] The cargo discharge pipe 81, connected to the discharge side of the pump portion 41 in the suction casing portion 70, extends upward in the cargo pump room 31, penetrates the hatch 33, and is connected to the manifold pipe 25 laid on the upper deck 23.

[0035] When the motor portion 43 of the deep well pump 40 operates, the cargo in the hold 11 is drawn up by the pump portion 41 through the cargo suction portion 51 and the suction casing portion 70 and is discharged from the pump portion 41. To discharge the cargo from a specific hold 11, the corresponding suction-portion hydraulic valve 61 is operated. The cargo discharged from the pump portion 41 passes through the cargo discharge pipe 81, reaches the manifold pipe 25, and is unloaded from the ship.

[0036] The suction pipes 57 and the cargo discharge pipe 81 have a large diameter of about 300 mm and a length of several meters. They expand and contract because of the deflection of the ship and changes in temperature, and this may damage the secured parts of the suction pipes 57 and the cargo discharge pipe 81. The deep well pump 40 accordingly has a large capacity, so that the vibrations of the motor portion 43 and the pump portion 41 caused by the operation of the motor portion 43 are transmitted to the hatch 33, to which the motor portion 43 is secured, and to the upper flange 77, to which the pump portion 41 is secured. However, because the suction casing portion 70 is suspended from the upper flange 77 through the flange expansion joint 79 inserted between the lower flange 75 and the upper flange 77, thermal expansion and contraction of the suction pipes 57 and the cargo discharge pipe 81 and the vibrations of the hatch 33 and the upper flange 77 are absorbed by the flange expansion joint 79. Accordingly, only a small amount of vibration or expansion and contraction due to temperature changes is transmitted to the suction casing portion 70.

[0037] Since the expansion and contraction due to temperature changes transmitted to the suction pipes 57, penetrating the lower-longitudinal-stool inclined wall 191, is reduced, no cracks will be formed in the wall of the lower longitudinal stool 19, and noise will be reduced.

Second embodiment

[0038] A cargo pump apparatus 2 of a second embodiment will be described next with reference to Figs. 5 and 6. Holds 11, a central bulkhead 13, transverse bulkheads 15, and a cargo pump room 31 are the same as those in the first embodiment, and a description of those elements will be omitted. A residual collection apparatus attached to the cargo pump apparatus 2 has the same structure and advantages as that of the first embodiment, and a description thereof will be also omitted.

[0039] In each cargo pump room 31, the cargo pump apparatus 2 principally includes one deep well pump 40, a cargo suction portion 52 connected to the suction side of the deep well pump 40, and a cargo discharge pipe 81 connected to the discharge side of the deep well pump 40.

[0040] The deep well pump 40 includes a motor portion 43 and a pump portion 41 connected to the motor portion 43 through a drive shaft 45, and the motor portion 43 is secured on a hatch 33. The hatch 33 includes a lower hatch 333 secured on an upper deck 23 and an upper hatch 331 placed on the lower hatch 333, with a hatch expansion joint 335 disposed therebetween. The motor portion 43 is secured on the upper hatch 331. The pump portion 41 is placed in a lower part of the cargo pump room 31, is connected to the motor portion 43 through the drive shaft 45, and is suspended from the upper hatch 331.

[0041] Like the flange expansion joint 79 of the first embodiment, the hatch expansion joint 335 of the second embodiment is of a bellows type having elasticity, air tightness, and spring properties, formed by concertinaing a metal tube.

[0042] The cargo suction portion 52 is connected to the suction side of the pump portion 41. The cargo suction portion 52 includes a T-shaped pipe 63 connected directly to the suction side of the pump portion 41 and two suction pipes 57 connected to both ends of the T-shaped pipe 63 through suction-portion hydraulic valves 61. Each suction pipe 57 penetrates a lower-longitudinal-stool inclined wall 191 and extends to the inside of the hold of the pair of holds 11 adjoining across the central bulkhead 13, and its open end is placed in a suction well 21 recessed in an inner bottom plate 17 of the hold 11.

[0043] The cargo discharge pipe 81, connected to the discharge side of the pump portion 41, extends upward in the cargo pump room 31, penetrates the hatch 33, and is connected to a manifold pipe 25 laid on the upper deck 23.

[0044] When the motor portion 43 of the deep well pump 40 operates, the cargo in the hold 11 is drawn up by the pump portion 41 through the cargo suction portion 52 and is discharged from the pump portion 41. To discharge the cargo from a specific hold 11, the corresponding suction-portion hydraulic valve 61 is operated. The cargo discharged from the pump portion 41 passes through the cargo discharge pipe 81, reaches the manifold pipe 25, and is unloaded from the ship.

[0045] The vibrations of the motor portion 43 and the pump portion 41 are transmitted to the upper hatch 331, on which the motor portion 43 and the pump portion 41 are secured. Because the upper hatch 331 is placed by means of the hatch expansion joint 335 on the lower hatch 333 secured on the upper deck 23, the vibrations of the upper hatch 331 are absorbed by the hatch expansion joint 335, and the vibrations of the motor portion 43 and the pump portion 41 are attenuated.

[0046] Since expansion and contraction due to the heat generated by the suction pipes 57, penetrating the lower-longitudinal-stool inclined wall 191, is reduced, no cracks will be formed in the wall of the lower longitudinal stool 19, and noise will be reduced.

Third embodiment

[0047] A cargo pump apparatus 3 of a third embodiment will be described next with reference to Figs. 7 and 8. Holds 11, a central bulkhead 13, transverse bulkheads 15, a cargo pump room 31, and a hatch 33 are the same as those in the first embodiment, and a description of those elements will be omitted. A residual collection apparatus attached to the cargo pump apparatus 3 has the same structure and advantages as that in the first embodiment, and a description thereof will be also omitted.

[0048] In each cargo pump room 31, the cargo pump apparatus 3 principally includes one deep well pump 40, a cargo suction portion 53 connected to the suction side of the deep well pump 40, and a cargo discharge pipe 81 connected to the discharge side of the deep well pump 40.

[0049] The deep well pump 40 includes a motor portion 43 and a pump portion 41 connected to the motor portion 43 through a drive shaft 45. The motor portion 43 is secured on the hatch 33, and the pump portion 41 is placed in a lower part of the cargo pump room 31 and is suspended from the hatch 33.

[0050] The cargo suction portion 53 is connected to the suction side of the pump portion 41. The cargo suction portion 53 includes a T-shaped pipe 63 connected directly to the suction side of the pump portion 41 and two suction pipes 57 connected to the two ends of the T-shaped pipe 63 through suction-portion hydraulic valves 61. Each suction pipe 57 is connected through an expansion pipe 59, and the suction pipe 57 extending from the expansion pipe 59 penetrates a lower-longitudinal-stool inclined wall 191 and extends to the inside of each hold of the pair of holds 11 adjoining across the central bulkhead 13. The open end of the suction pipe 57 is placed in a suction well 21 recessed in an inner bottom plate 17 of the hold 11.

[0051] The cargo discharge pipe 81, connected to the discharge side of the pump portion 41, extends upward in the cargo pump room 31, penetrates the hatch 33, and is connected to a manifold pipe 25 laid on an upper deck 23.

[0052] When the motor portion 43 of the deep well pump 40 operates, the cargo in the hold 11 is drawn up by the pump portion 41 through the cargo suction portion 53 and is discharged from the pump portion 41. To discharge the cargo from a specific hold 11, the corresponding suction-portion hydraulic valve 61 is operated. The cargo discharged from the pump portion 41 passes through the cargo discharge pipe 81, reaches the manifold pipe 25, and is unloaded from the ship.

[0053] The operation of the motor portion 43 of the deep well pump 40 strongly vibrates the motor portion 43 and the pump portion 41. The vibrations of the motor portion 43 and the pump portion 41, however, are absorbed by the expansion pipes 59 connected to the suction pipes 57, and thus, hardly any vibrations are transmitted to the suction pipes 57, penetrating the lower-longitudinal-stool inclined wall 191.

[0054] Since expansion and contraction caused by the heat generated by the suction pipes 57, penetrating the lower-longitudinal-stool inclined wall 191, is reduced, no cracks will be formed in the wall of the lower longitudinal stool 19, and noise will be reduced.

Fourth embodiment

[0055] A cargo pump apparatus 4 of a fourth embodiment will be described next with reference to Fig. 9. Holds 11, a central bulkhead 13, transverse bulkheads 15, a cargo pump room 31, and a hatch 33 are the same as those in the first embodiment, and a deep well pump 40 is the same as that in the third embodiment, and therefore, a description of those elements will be omitted. A residual collection apparatus attached to the cargo pump apparatus 4 has the same structure and advantages as that of the first embodiment, and a description thereof will be also omitted.

[0056] In each cargo pump room 31, the cargo pump apparatus 4 principally includes one deep well pump 40, a cargo suction portion 54 connected to the suction side of the deep well pump 40, and a cargo discharge pipe 81 connected to the discharge side of the deep well pump 40.

[0057] The cargo suction portion 54 is connected to the suction side of a pump portion 41 of the deep well pump 40. The cargo suction portion 54 includes an L-shaped expansion pipe 67 connected directly to the suction side of the pump portion 41, a T-shaped pipe 63 connected to the L-shaped expansion pipe 67, and two suction pipes 57 connected to both ends of the T-shaped pipe 63 through suction-portion hydraulic valves 61. Each suction pipe 57 penetrates a lower-longitudinal-stool inclined wall 191 and extends to the inside of each hold of the pair of holds 11 adjoining across the central bulkhead 13, and its open end is placed in a suction well 21 recessed in an inner bottom plate 17 of the hold 11.

[0058] The cargo discharge pipe 81, connected to the discharge side of the pump portion 41, extends upward in the cargo pump room 31, penetrates the hatch 33, and is connected to a manifold pipe 25 laid on an upper deck 23.

[0059] When a motor portion 43 of the deep well pump 40 operates, the cargo in the hold 11 is drawn up by the pump portion 41 through the cargo suction portion 54 and is discharged from the pump portion 41. To discharge the cargo from a specific hold 11, the corresponding suction-portion hydraulic valve 61 is operated. The cargo discharged from the pump portion 41 passes through the cargo discharge pipe 81, reaches the manifold pipe 25, and is unloaded from the ship.

[0060] The operation of the motor portion 43 of the deep well pump 40 strongly vibrates the motor portion 43 and the pump portion 41, but the vibrations of the motor portion 43 and the pump portion 41 are absorbed and reduced by the L-shaped expansion pipe 67.

[0061] Since expansion and contraction caused by the heat generated by the suction pipes 57, penetrating the lower-longitudinal-stool inclined wall 191, is reduced, no cracks will be formed in the wall of the lower longitudinal stool 19, and noise will be reduced.

Fifth embodiment

[0062] A cargo pump apparatus 5 of a fifth embodiment will be described next with reference to Fig. 10. Holds 11, a central bulkhead 13, transverse bulkheads 15, a cargo pump room 31, and a hatch 33 are the same as those in the first embodiment, and a deep well pump 40 is the same as that in the third embodiment, and therefore, a description of those elements will be omitted. A residual collection apparatus attached to the cargo pump apparatus 5 has the same structure and advantages as that of the first embodiment, and a description thereof will be also omitted.

[0063] In each cargo pump room 31, the cargo pump apparatus 5 principally includes one deep well pump 40, a cargo suction portion 55 connected to the suction side of the deep well pump 40, and a cargo discharge pipe 81 connected to the discharge side of the deep well pump 40.

[0064] The cargo suction portion 55 is connected to the suction side of a pump portion 41 of the deep well pump 40. The cargo suction portion 55 includes an L-shaped pipe 65 connected directly to the suction side of the pump portion 41, a T-shaped pipe 63 connected to the L-shaped pipe 65 through an expansion pipe 59, and two suction pipes 57 connected to both ends of the T-shaped pipe 63 through suction-portion hydraulic valves 61. Each suction pipe 57 penetrates a lower-longitudinal-stool inclined wall 191 and extends to the inside of each hold of the pair of holds 11 adjoining across the central bulkhead 13, and its open end is placed in a suction well 21 recessed in an inner bottom plate 17 of the hold 11.

[0065] The cargo discharge pipe 81, connected to the discharge side of the pump portion 41, extends upward in the cargo pump room 31, penetrates the hatch 33, and is connected to a manifold pipe 25 laid on an upper deck 23.

[0066] When a motor portion 43 of the deep well pump 40 operates, the cargo in the hold 11 is drawn up by the pump portion 41 through the cargo suction portion 55 and is discharged from the pump portion 41. To discharge the cargo from a specific hold 11, the corresponding suction-portion hydraulic valve 61 is operated. The cargo discharged from the pump portion 41 passes through the cargo discharge pipe 81, reaches the manifold pipe 25, and is unloaded from the ship.

[0067] The operation of the motor portion 43 of the deep well pump 40 strongly vibrates the motor portion 43 and the pump portion 41. The vibrations of the motor portion 43 and the pump portion 41 are absorbed and reduced by the expansion pipe 59 inserted between the L-shaped pipe 65 and the T-shaped pipe 63.

[0068] Since expansion and contraction caused by the heat generated by the suction pipes 57, penetrating the lower-longitudinal-stool inclined wall 191, is reduced, no cracks will be formed in the wall of the lower longitudinal stool 19, and noise will be reduced.

Sixth embodiment

[0069] A cargo pump apparatus 6 of a sixth embodiment will be described next with reference to Fig. 11. Holds 11, a central bulkhead 13, transverse bulkheads 15, and a hatch 33 are the same as those in the first embodiment, and a deep well pump 40 is the same as that in the third embodiment, and therefore, a description of those elements will be omitted. A residual collection apparatus attached to the cargo pump apparatus 6 has the same structure and advantages as that of the first embodiment, and a description thereof will be also omitted.

[0070] In the first to fifth embodiments, the cargo pump room 31 is provided on the stern side of each pair of holds 11 adjoining across the lower-longitudinal-stool inclined wall 191. In the sixth embodiment, a cargo pump room 31 is provided for each hold block formed by four holds 11 adjoining at an intersecting portion of a lower-longitudinal-stool inclined wall 191 and a transverse bulkhead 15.

[0071] In each cargo pump room 31, the cargo pump apparatus 6 principally includes one deep well pump 40, a cargo suction portion 56 connected to the suction side of the deep well pump 40, and a cargo discharge pipe 81 connected to the discharge side of the deep well pump 40.

[0072] The cargo suction portion 56 is connected to the suction side of a pump portion 41 of the deep well pump 40. The cargo suction portion 56 includes a first T-shaped pipe 631 connected directly to the suction side of the pump portion 41, two second T-shaped pipes 632 connected to both ends of the first T-shaped pipe 631 through expansion pipes 59 and suction-portion hydraulic valves 61, and four suction pipes 57 connected to both ends of the two second T-shaped pipes 632. The two suction pipes 57 connected to one of the two second T-shaped pipe 632 penetrate the lower-longitudinal-stool inclined wall 191 and extend to the inside of one pair of holds 11 adjoining across the central bulkhead 13, and their open ends are placed in suction wells 21 recessed in inner bottom plates 17 of the holds 11. The two suction pipes 57 connected the other of the two second T-shaped pipe 632 extend to the inside of the other pair of holds 11, adjoining the one pair of holds 11 across the transverse bulkhead 15, and their open ends are placed in suction wells 21 recessed in inner bottom plates 17 of the holds 11.

[0073] The cargo discharge pipe 81, connected to the discharge side of the pump portion 41, extends upward in the cargo pump room 31, penetrates the hatch 33, and is connected to a manifold pipe 25 laid on an upper deck 23.

[0074] When a motor portion 43 of the deep well pump 40 operates, the cargo in the hold 11 is drawn up by the pump portion 41 through the cargo suction portion 56 and is discharged from the pump portion 41. To discharge the cargo from a specific hold 11, the corresponding suction-portion hydraulic valve 61 is operated. The cargo discharged from the pump portion 41 passes through the cargo discharge pipe 81, reaches the manifold pipe 25, and is unloaded from the ship.

[0075] Although the operation of the motor portion 43 of the deep well pump 40 strongly vibrates the motor portion 43 and the pump portion 41, the vibrations of the motor portion 43 and the pump portion 41 are absorbed and reduced by the expansion pipes 59.

[0076] Since expansion and contraction caused by the heat generated by the suction pipes 57, penetrating the lower-longitudinal-stool inclined wall 191, is reduced, no cracks will be formed in the wall of the lower longitudinal stool 19, and noise will be reduced.

[0077] Although the single deep well pump 40 is provided for each pair of holds 11 adjoining across the central bulkhead 13 in the first to fifth embodiments, the single deep well pump 40 is provided for each set of four holds 11 adjacent to the cargo pump room 31 in this embodiment. Although the number of deep well pumps 40 is reduced, the number of types of cargo that can be carried is also reduced.

[0078] In the first to fifth embodiments, four suction pipes 57 can be connected to the lower end portion of the suction casing portion 70 or the suction side of the pump portion 41, through the first T-shaped pipe 631 and the second T-shaped pipes 632.

[0079] A cargo pump apparatus is suitable for liquid cargo ships required to carry six to eight types of cargo and having a plurality of holds partitioned by a central bulkhead standing upright on a lower longitudinal stool and transverse bulkheads. Each cargo pump room is provided at an intersecting portion of the central bulkhead and one of the transverse bulkheads, and penetrates a hatch provided on an upper deck and the lower longitudinal stool. One deep well pump is provided in each cargo pump room. The suction side of the deep well pump is connected to a cargo suction portion which has an open end in the hold and penetrates the inclined wall of the lower longitudinal stool. The discharge side of the deep well pump is connected to a cargo discharge pipe connected to a manifold pipe laid on the upper deck through the cargo pump room. Either the cargo suction portion in the cargo pump room is connected through an expansion pipe, or the deep well pump is secured through an expansion pipe.

Claims

1. A cargo pump apparatus for a liquid cargo ship comprising a plurality of holds partitioned by a central bulkhead provided upright along a center line of the cargo ship and a plurality of transverse bulkheads provided upright at right angles to the central bulkhead,
the central bulkhead standing upright on a lower longitudinal stool provided on an inner bottom plate of a double bottom, the lower longitudinal stool being almost isosceles-trapezoidal in cross section;
a cargo pump room being provided at an intersecting portion of the central bulkhead and one of the transverse bulkheads, the cargo pump room connecting, along the central bulkhead, a hatch provided in an upper deck and the inside of the lower longitudinal stool;
the cargo pump room being provided with a deep well pump and a residual collection apparatus;
a suction side of the deep well pump being connected through a hydraulic valve to a cargo suction portion penetrating an inclined wall of the lower longitudinal stool, the cargo suction portion having an open end placed in a suction well recessed in the inner bottom plate of the hold;
a discharge side of the deep well pump being connected to a cargo discharge pipe passing through the cargo pump room and connected to a manifold pipe laid on the upper deck; and
the cargo suction portion in the cargo pump being connected through an expansion pipe, or the deep well pump being secured through an expansion joint.

2. A cargo pump apparatus for a liquid cargo ship according to Claim 1,
wherein the deep well pump is disposed in the cargo pump room; and
the cargo suction portion connected to the suction side of the deep well pump comprises two or four suction pipes extending to two or four holds adjoining across the central bulkhead.

3. A cargo pump apparatus for a liquid cargo ship according to one of Claims 1 and 2,
wherein the deep well pump comprises a pump portion and a motor portion connected through a drive shaft;
the motor portion is secured on the upper deck;
the pump portion is enclosed by a suction casing comprising a lower flange provided in an upper part thereof, a cylindrical portion provided in a central part thereof, and a funnel-shaped portion connected to the cylindrical portion and having a narrow end at the bottom, and the pump portion is secured to an upper flange connected to the lower flange through the expansion joint;
the upper flange is suspended from the hatch; and
the cargo suction portion comprises a T-shaped pipe connected to the lower end of the suction casing and two suction pipes connected to both ends of the T-shaped pipe through hydraulic valves; or
the cargo suction portion comprises a first T-shaped pipe connected to the lower end of the suction casing, two second T-shaped pipes connected to both ends of the first T-shaped pipe through straight pipes, and four suction pipes connected to both ends of the two second T-shaped pipes through hydraulic valves.

4. A cargo pump apparatus for a liquid cargo ship according to one of Claims 1 and 2,
wherein the deep well pump comprises a pump portion and a motor portion connected through a drive shaft;
the hatch comprises a lower hatch and an upper hatch placed on the lower hatch, with the expansion joint disposed therebetween;
the motor portion is secured on the upper hatch; and
the cargo suction portion comprises a T-shaped pipe connected to the lower end of the pump portion and two suction pipes connected to both ends of the T-shaped pipe through hydraulic valves; or
the cargo suction portion comprises a first T-shaped pipe connected to the lower end of the pump portion, two second T-shaped pipes connected to both ends of the first T-shaped pipe through straight pipes, and four suction pipes connected to both ends of the two second T-shaped pipes through hydraulic valves.

5. A cargo pump apparatus for a liquid cargo ship according to one of Claims 1 and 2,
wherein the deep well pump comprises a pump portion and a motor portion connected through a drive shaft;
the motor portion is secured on the hatch;
the cargo suction portion comprises a T-shaped pipe connected to the lower end of the pump portion and two suction pipes connected to both ends of the T-shaped pipe through hydraulic valves; or
the cargo suction portion comprises a first T-shaped pipe connected to the lower end of the pump portion, two second T-shaped pipes connected to both ends of the first T-shaped pipe through straight pipes, and four suction pipes connected to both ends of the two second T-shaped pipes through hydraulic valves; and
each of the two or four suction pipes penetrating the inclined wall of the lower longitudinal stool is connected through the expansion pipe.

6. A cargo pump apparatus for a liquid cargo ship according to one of Claims 1 and 2,
wherein the deep well pump comprises a pump portion and a motor portion connected through a drive shaft;
the motor portion is secured on the hatch;
the cargo suction portion comprises an L-shaped pipe connected to the lower end of the pump portion, a T-shaped pipe connected to the L-shaped pipe, and two suction pipes connected to both ends of the T-shaped pipe through hydraulic valves; or
the cargo suction portion comprises an L-shaped pipe connected to the lower end of the pump portion, a first T-shaped pipe connected to the L-shaped pipe, two second T-shaped pipes connected to both ends of the first T-shaped pipe, and four suction pipes connected to both ends of the two second T-shaped pipes; and
the L-shaped pipe is an L-shaped expansion pipe formed of the expansion pipe.

7. A cargo pump apparatus for a liquid cargo ship according to one of Claims 1 and 2,
wherein the deep well pump comprises a pump portion and a motor portion connected through a drive shaft;
the motor portion is secured on the hatch;
the cargo suction portion comprises an L-shaped pipe connected to the lower end of the pump portion, a T-shaped pipe connected to the L-shaped pipe, and two suction pipes connected to both ends of the T-shaped pipe through hydraulic valves; or
the cargo suction portion comprises an L-shaped pipe connected to the lower end of the pump portion, a first T-shaped pipe connected to the L-shaped pipe, two second T-shaped pipes connected to both ends of the first T-shaped pipe, and four suction pipes connected to both ends of the two second T-shaped pipes; and
either the L-shaped pipe and the T-shaped pipe or the L-shaped pipe and the first T-shaped pipe are connected through the expansion pipe.

8. A cargo pump apparatus for a liquid cargo ship according to one of Claims 1 and 2,
wherein the deep well pump comprises a pump portion and a motor portion connected through a drive shaft;
the motor portion is secured on the hatch;
the cargo suction portion comprises a first T-shaped pipe connected to the lower end of the pump portion, two second T-shaped pipes connected to both ends of the first T-shaped pipe through straight pipes, and four suction pipes connected to both ends of the two second T-shaped pipes through hydraulic valves; and
each of the straight pipes is connected through the expansion pipe.

Drawing