US3460692A - Process for filling the hold of a ship with sand - Google Patents

Process for filling the hold of a ship with sand Download PDF

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Publication number
US3460692A
US3460692A US599249A US3460692DA US3460692A US 3460692 A US3460692 A US 3460692A US 599249 A US599249 A US 599249A US 3460692D A US3460692D A US 3460692DA US 3460692 A US3460692 A US 3460692A
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US
United States
Prior art keywords
sand
hold
tube
filling
mixture
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
Application number
US599249A
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English (en)
Inventor
Hendrik Pot
Adam Pieter Hendrik Baardewijk
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IHC Holland NV
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IHC Holland NV
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Filing date
Publication date
Application filed by IHC Holland NV filed Critical IHC Holland NV
Application granted granted Critical
Publication of US3460692A publication Critical patent/US3460692A/en
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/30—Conveying materials in bulk through pipes or tubes by liquid pressure
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F7/00—Equipment for conveying or separating excavated material
    • E02F7/04—Loading devices mounted on a dredger or an excavator hopper dredgers, also equipment for unloading the hopper
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F7/00—Equipment for conveying or separating excavated material
    • E02F7/10—Pipelines for conveying excavated materials

Definitions

  • the invention relates to a process for filling the hold of a ship with sand from a sucked-up mixture of sand and water, which mixture is fed via a tube into the hold to be filled.
  • the filling of, for instance, a hopper with sand has been eflected for over fifty years by charging a mixture of sand and water by means of a pump via a tube into the hold to be filled, in which the sand must deposit from the mixture, while the superfluous water flows ofl again over an edge of the hold to be filled.
  • the mixture is usually supplied at one end of the hold to be filled and the water is discharged at the opposite end.
  • the tube has its month near the upper edge of the hold to be filled.
  • the stream flowing over the edge contains high percentage of sand, as a result of which losses of 50%, for instance, may occur, in the case of fine sand, which means that 50% of the sand supplied is lost via the overflow.
  • the loss is about 25% to 35%.
  • the mouth of the tube is placed at great depth in the hold.
  • the invention therefore, comprises the downward extension of the tube, so that the mixture of sand and water flows out of it near the bottom of the hold to be filled.
  • the outflow of the mixture will be impeded very soon by the sand depositing on the bottom and that complete sanding-up of the installation will take place.
  • the apparatus for carrying out the process may comprise a tube downwardly Widening over the greater part of the section extending into the hold to be filled.
  • the outflow losses are reduced considerably and turbulence in the mass surrounding the tube is avoided as much as possible, for owing to the larger diameter of the tube at the mouth the outflow will be quiet.
  • a sanding-up of the interior of the widening tube will thus readily be obviated, because the plug of sand is displaced towards a wider space.
  • the tube irrespective of its construction, may be provided in the downwardly directed part with openings in the wall, which openings may have the form of longitudinal slots. It the filling process is to be stopped for one reason or another, the sand outside and inside the downwardly directed tube will settle, and this may entail difficulties for restarting the filling process. If the tube is provided with openings, water will flow out of these openings as the process is restarted, as a result of which the sand around the tube is made to flow again, and thus the filling process can start again.
  • openings cause air to be sucked in as long as the openings are still above the liquid level
  • flaps do not impede the flow of water from the tube, but do prevent the entrance of air. If air can enter the tube via the openings, violent turbulence will result because the mixture of water and sand is detached from the Wall of the tube and sucks in air; this turbulence adversely affects the smooth deposition of the sand.
  • the tube extending downwards into the hold may comprise an expansion chamber at its lower end.
  • This is a chamber with a large number of outlet openings, by means of which the mixture is distributed over a large area in a number of streams of considerably reduced velocity.
  • FIGURE 1 is a diagrammatical section of a hopper comprising the supply tube according to the invention.
  • FIGURE 2 shows a diiferent embodiment
  • This hopper comprises a hold 1 with trap doors 2 and 3 for the discharge of the sand and a keelson 4.
  • the numerals 5 and 6 designate the floating parts of the vessel.
  • the supply pipe directed towards the hold at 7, which forms part of a suction pump not shown in the drawing, has a downwardly directed, conically widening part 8, which ends just above the keelson 4.
  • the tube is directed more fully by towards the top of the keelson 4 in order to fill the hold on either side of it uniformly.
  • the position of the tube has no particular importance, the only important point is the place of the month.
  • At 9 is shown longitudinal slots in the Wall of the tube and which define laterally outwardly extending branches of the sand-water flow path.
  • the broken line 10 shows how at a sand level 11 a zone 12 of high sand concentration is formed around the tube 8.
  • the outflow of the mixture from the tube is slowed down also by this in such a way that the sand is sutficiently enabled to deposit. This is of particular importance in the handling of fine sand, the individual grains of which are light.
  • the slots 9 are desirable with a view to the restarting of the process when it has been stopped for one reason or another. These slots may be obturated on the outside with a rubber strip (not shown).
  • a rectangular box 14 is present, which may be larger in the direction of width and/ or the longitudinal direction of the vessel than the width shown in FIGURE 2.
  • the walls of this box 14 are provided with a large number of slots 15, which are also present in the bottom and in the upper surface and which define laterally outwardly extending branches of the sand-Water flow path.
  • a process for filling the hold of a ship with sand comprising positioning a rigid filling conduit in the hold with its lower end in the lower half of the hold, and feeding through said conduit a mixture of sand and water until sand is deposited in the hold to a level adjacent the top of the hold and the deposited sand surrounds and defines an upwardly widening conical zone that surrounds the conduit and that is filled with generally upwardly flowing mixture, the rigidity of the conduit maintaining the lower end of the conduit submerged in the mixture adjacent the apex of said conical zone.
  • a process for filling the hold of a ship with sand comprising positioning a filling conduit in the hold with its lower end at great depth in the hold, feeding through said conduit a mixture of sand and water up to a level far above the lower end of said conduit, and feeding said mixture along a flow path through said conduit that is greatly enlarged in cross-sectional area at the lower end of said conduit as compared to an upper portion of said conduit thereby to reduce outflow losses of sand and turbulence in the sand and water surrounding the conduit.
  • a process for filling the hold of a ship with sand comprising positioning a filling conduit in the hold with its lower end at great depth in the hold, feeding through said conduit a mixture of sand and water up to a level far above the lower end of said conduit, and feeding said mixture along a main flow path through said conduit that has a plurality of laterally outwardly extending branches adjacent the lower end of said conduit, discontinuing said feeding whereupon sand settles about said flow path branches and above the main outlet of the main flow path, and resuming said feeding whereby the flow of said mixture from the main outlet is facilitated by movement of the mixture through said branches.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Ship Loading And Unloading (AREA)
  • Underground Or Underwater Handling Of Building Materials (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
US599249A 1965-12-07 1966-12-05 Process for filling the hold of a ship with sand Expired - Lifetime US3460692A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6515897A NL6515897A (enrdf_load_stackoverflow) 1965-12-07 1965-12-07

Publications (1)

Publication Number Publication Date
US3460692A true US3460692A (en) 1969-08-12

Family

ID=19794844

Family Applications (1)

Application Number Title Priority Date Filing Date
US599249A Expired - Lifetime US3460692A (en) 1965-12-07 1966-12-05 Process for filling the hold of a ship with sand

Country Status (6)

Country Link
US (1) US3460692A (enrdf_load_stackoverflow)
BE (1) BE690337A (enrdf_load_stackoverflow)
DE (1) DE1634857C3 (enrdf_load_stackoverflow)
FR (1) FR1506646A (enrdf_load_stackoverflow)
GB (1) GB1111519A (enrdf_load_stackoverflow)
NL (1) NL6515897A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160297624A1 (en) * 2015-04-08 2016-10-13 Cyclonaire Corporation Pneumatically powered locomotive sander

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6816373A (enrdf_load_stackoverflow) * 1968-11-15 1970-05-20

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US689741A (en) * 1901-09-10 1901-12-24 Alexander Mcdougall Vessel for transporting granular substances.
US726685A (en) * 1902-08-01 1903-04-28 Elliot Holbrook Apparatus for loading vessels.
US1127137A (en) * 1912-10-09 1915-02-02 Manitowoc Ship Building & Dry Dock Company Sand-barge.
US1508521A (en) * 1922-11-03 1924-09-16 John W Kreuser Excavator
US1750095A (en) * 1928-06-06 1930-03-11 Ewig Friedrich Hold for dredgers
US1752410A (en) * 1927-04-06 1930-04-01 Adams Coal Machinery Company Barge coal-loading apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US689741A (en) * 1901-09-10 1901-12-24 Alexander Mcdougall Vessel for transporting granular substances.
US726685A (en) * 1902-08-01 1903-04-28 Elliot Holbrook Apparatus for loading vessels.
US1127137A (en) * 1912-10-09 1915-02-02 Manitowoc Ship Building & Dry Dock Company Sand-barge.
US1508521A (en) * 1922-11-03 1924-09-16 John W Kreuser Excavator
US1752410A (en) * 1927-04-06 1930-04-01 Adams Coal Machinery Company Barge coal-loading apparatus
US1750095A (en) * 1928-06-06 1930-03-11 Ewig Friedrich Hold for dredgers

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160297624A1 (en) * 2015-04-08 2016-10-13 Cyclonaire Corporation Pneumatically powered locomotive sander
US9993908B2 (en) * 2015-04-08 2018-06-12 Cyclonaire Corporation Pneumatically powered locomotive sander

Also Published As

Publication number Publication date
DE1634857C3 (de) 1975-01-16
GB1111519A (en) 1968-05-01
NL6515897A (enrdf_load_stackoverflow) 1967-06-08
FR1506646A (fr) 1967-12-22
DE1634857B2 (de) 1974-05-30
BE690337A (enrdf_load_stackoverflow) 1967-05-02
DE1634857A1 (de) 1971-11-11

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