US3323257A - Systems for underwater sandblasting - Google Patents

Systems for underwater sandblasting Download PDF

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US3323257A
US3323257A US39088364A US3323257A US 3323257 A US3323257 A US 3323257A US 39088364 A US39088364 A US 39088364A US 3323257 A US3323257 A US 3323257A
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sandblasting
underwater
conduit
tank
air
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Rocco P Fonti
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Rocco P Fonti
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24CABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C7/00Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
    • B24C7/0007Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a liquid carrier
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24CABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C7/00Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
    • B24C7/0046Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier

Description

R. F". FONTi SYSTEMS FOR UNDERWATER SANDBLASTING June 6, 1967 Filed Aug. 20, 1964 INVENTOR ROCCO P. FONTI W amp "l-CLE ATTORNEY United States Patent 3,323,257 SYSTEMS FOR UNDERWATER SAN DBLASTING Rocco P, Fonti, Vernon Motel, 32 Vernon St., Plymouth, Mass. 02360 Filed Aug. 20, 1964, Ser. No. 390,883 1 Claim. (Cl. 51--8) This invention relates generally to underwater sandblasting and more particularly is directed towards new and improved systems for the efiioient delivery of air and sand mixtures to sandblasting guns in underwater opera tions.

Sandblasting as a cleaning technique has been practiced for many years and has been found useful for the cleaning of castings and other metal work in addition to abrading surfaces for useful as well as decorative purposes. Sandblasting also has been widely used for the periodic cleaning of buildings, bridges, ships and similar structures. Heretofore, sandblasting has been used only for above water applications. However, in my Patent No. 3,256,642, dated June 21, 1966, there is disclosed an underwater sandblasting gun specifically designed and adapted for carrying out efficiently the cleaning of underwater surfaces by sandblasting. The present invention concerns itself with the provision of improved systems for supplying a flow of sand and air mixture in sufiicient volume, at the proper pressure and at the proper velocity for efficiently carrying out underwater sandblasting operations.

Accordingly, it is an object of the present invention to provide improvements in sandblasting systems having particular utility in underwater sandblasting operations.

Another object of this invention is to provide sandblasting systems adapted to deliver a flow of high-pressure high-velocity air and sand on a continuous basis to a gun located below the surface of the water.

More particularly, this invention features a system for use in underwater sandblasting operations comprising a source of compressed air, a gun to be located below the surface of the water, a conduit connecting the gun to the source of compressed air, a feeding system connecting the conduit to a supply of abrasive particulate material, means for producing a high-velocity mixture of air and sand within the conduit and means connecting the conduit to the supply system to improve evacuation of the supply system.

However, these and other features of the invention, along with further objects and advantages thereof, will become more fully apparent from the following detailed description of preferred embodiments of the invention, with reference being made to the accompanying drawings, in which:

FIG, 1 is a view in side elevation partly in section of a system for use in underwater sandblasting made according to the invention, and

FIGS. 2, 3 and 4 are views similar to FIG. 1 but showing modifications thereof.

Referring now to the drawings, the reference character generally indicates a compressed air system comprising a motor 12, an air compressor 14 and a charging tank 16. The tank 16 is connected by a conduit 18 to a dispensing tank 20 which, in turn, is connected by a conduit 22 to an underwater sandblasting nozzle 24 preferably of the sort shown in my Patent No. 3,256,642 dated June 21, 1966, located below the surface of the water and, in operation, is spaced from and directed at a surface 26 to be cleaned.

The dispensing tank 20 comprises a hopper 28 mounted on top of the tank directly above a vertically moveable filling valve 30. This filling valve 30 is controlled by means of an air line 32 connected to the conduit 18 and cleaning.

passing into the tank 20. It will be understood that the filling valve 30 automatically closes when air passes through line 32 and automatically opens when air is eX hausted through a three-way valve 34. The tank 20 is thus maintained under a pressure to balance with the pressure within a mixing chamber 36 located at the base of the tank 20 and feeding into the conduit 22. With the pressures balanced between the mixing chamber 36 and the interior of the tank 20 abrasive particulate material 38, such as sand or the like, will drop freely by gravity through the mixing chamber 36 into the conduit 22. A gate valve 40 may be provided to control the flow of sand 38 through the mixing chamber.

In the operation of the system, it is necessary that the discharge pressure at the nozzle 24 be greater than the water pressure surrounding the nozzle. It has been found that in depths down to 30 feet or so, air pressure of 80 p.s.i. or more is required for efiicient cleaning to take place. In depths down to about 100 feet a pressure of 100 to 175 p.s.i. is required to obtain effective sandblast In addition to sufiicient air pressure to overcome the water pressure, it is also necessary that there be a relatively high volume output of air from the compressor and for general underwater work a capacity of 125 cubic feet per minute is required. Various types of abrasive material may be used and, in practice, sea sand or silica sand is preferred since they possess greater hardness and are rougher grained than lake or river sand. Abrasives such as steel grit and shot may be employed but these materials are more expensive and the nature of the work does not permit convenient recovery of the abrasive as may be done with open-air sandblasting.

Referring now more particularly to FIG. 2 of the drawings, there is illustrated a modification of the invention and in this embodiment an air compressor system 10 is connected by a conduit 42 to an eductor 44 which takes suction on a pile 46 of abrasive material through a conduit 48. The eductor 44 is connected by conduit 50 to a nozzle 52 for underwater sandblasting.

In FIG. 3 there is illustrated another modification of the invention and in this embodiment an air compressor system 10 is connected to a dispensing tank 54 of a construction similar to that of the tank 20 in FIG. 1 with the exception that a line 56 has been added to deliver a How of pressurized air to the base of the hopper to facilitate clearing the sand through the filling valve. The dis charge from the dispensing tank 54 is delivered to a conduit 58 into a venturi tube 60 which increases the velocity of the sand and air mixture and thereby provides an improved underwater cleaning. A conduit 62 connects the venturi 60 to a nozzle 64.

Referring now more particularly to FIG. 4 of the drawings, there is illustrated a further modification of the invention and in this embodiment a relatively high pressure water pump 66 taking suction on a line 68 delivers a flow of pressurized water through a conduit 70 into a sand dispensing unit 72. This unit includes a hopper 74 having a flow control valve 76 for delivering a flow of sand into an eductor 78. The eductor 78 is operated by a flow of pressurized water introduced through a line 80 and discharging as a mixture of sand and water into a tank 82. Within the tank 82, the air and water mixture is delivered by a tube 84 into a second eductor type mixing station 86 where it is combined with a fiow of highpressure water fed through a tube 88 and the combined discharges are fed into a single conduit 90 for delivery to a nozzle 92 located under water.

The systems illustrated and described herein are particularly useful for underwater sandblasting and are adapted to provide the continuous flow of high-pressure, high-volume and high-velocity output which is required for efficient underwater sandblasting operations. The sys- :tems are relatively simple and yet are well adapted for eflicient operation without clogging of the lines as occurs frequently with conventional systems.

While the invention has been described with particular reference to the illustrated embodiments, it will be understood that numerous modifications thereto will appear to those skilled in the art. Accordingly, the above description and accompanying drawings should be taken as illustrative of the invention and not in a limiting sense.

Having thus described the invention, what I claim and desire to obtain by Letters Patent of the United States is:

A system for underwater sandblasting, comprising (a) conduit,

(b) a nozzle adapted for use underwater connected to one end of said conduit,

() means connected to the opposite end of said conduit for delivering to said conduit a flow of fluid at a sufficient pressure and velocity and in suflicient volume to discharge through said nozzle when said nozzle is disposed under water,

(d) means for storing a quantity of particulate abrasive material in proximity to said conduit,

(e) feeding means responsive to the flow of said fluid for transferring regulated amounts of said abrasive material from said storing means into said conduit,

(f) said feeding means including a hopper adapted to dispense a flow of abrasive material, a pressure tank disposed below said hopper to receive said material and connected to said pressurized fluid, a fluid pressure responsive valve mounted in said tank for controlling the flow of said abrasive material into said tank and a mixing chamber connecting said tank to said conduit wherein said abrasive material is mixed with said fluid, and,

(g) venturi means connected to said conduit means between said nozzle and said feeding means for increasing the velocity of said fluid and abrasive material.

References Cited UNITED STATES PATENTS 999,485 8/1911 Carolin 518 1,706,737 3/1929 Moore 5112 1,940,539 12/1933 Fritsche 5.18 2,200,587 5/ 1940 Tirrell 518 2,388,818 11/1945 Bick 518 2,455,514 12/1948 Mead 518 2,613,482 10/1952 Hamacher 51-8 3,212,217 10/1965 Furgason 518 3,256,642 6/1966 Fonti 5111 LESTER M. SWINGLE, Primary Examiner.

US3323257A 1964-08-20 1964-08-20 Systems for underwater sandblasting Expired - Lifetime US3323257A (en)

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Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3888054A (en) * 1973-11-16 1975-06-10 Western Electric Co Method for abrasive cutting in a liquid
DE2736762A1 (en) * 1976-08-16 1978-02-23 Union Carbide Corp Method and device for metering of abrasive
EP0025156A1 (en) * 1979-08-22 1981-03-18 Myers-Europe Pumpen GmbH Method and apparatus for wet abrasive blasting
US4545317A (en) * 1981-04-01 1985-10-08 Gkss-Forschungszentrum Geesthacht Gmbh Device for treating the surfaces of structures and ships
US4548001A (en) * 1980-05-16 1985-10-22 John Link Cleaning apparatus and method
EP0164914A1 (en) * 1984-05-15 1985-12-18 N.I.S. Engineering Limited Jet cleaning operation
US4562612A (en) * 1983-08-29 1986-01-07 Williams Raymond F Fluid-driven transducer vacuum tool
FR2576821A1 (en) * 1985-02-04 1986-08-08 Carboxyque Francaise Installation for spraying dry ice particles
DE3536138C1 (en) * 1985-10-10 1987-03-26 Schubert Werner Pipe-cleaning device with nozzle head
US5065551A (en) * 1988-03-02 1991-11-19 Cleaning Technology Limited Abrasive cleaning or cutting
DE19909377A1 (en) * 1999-03-04 2000-09-14 Kurt Hoerger Method for cutting and clearing blockages in accessible or non-accessible pipelines uses abrasive water jet pumped through nozzle at minimum pressure of 100 bar
US20040005849A1 (en) * 2000-10-20 2004-01-08 Ant Applied New Technologies Ag Method for filling a pressure container and device for producing a jet of a suspension
WO2005039825A1 (en) * 2003-10-24 2005-05-06 Watech As A method and a device for surface cleaning
US20070105486A1 (en) * 2005-11-09 2007-05-10 Oceaneering International, Inc. Subsea abrasive jet cutting system and method of use
CN100582966C (en) 2004-12-20 2010-01-20 劳力士有限公司 Timepiece dial and processes for manufacturing this dial
US20140087637A1 (en) * 2012-09-25 2014-03-27 Paul L. Miller Abrasive Waterjet Cutting System For Subsea Operations
US20170151651A1 (en) * 2012-09-25 2017-06-01 Paul L. Miller Abrasive Entrainment Waterjet Cutting
US20170151650A1 (en) * 2012-09-25 2017-06-01 Paul L. Miller Abrasive Entrainment Waterjet Cutting
US20180043505A1 (en) * 2016-08-15 2018-02-15 Paul L. Miller Abrasive Entrainment Waterjet Cutting
US20180080734A1 (en) * 2016-08-15 2018-03-22 Paul L. Miller Abrasive Entrainment Waterjet Cutting

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US999485A (en) * 1910-09-15 1911-08-01 Entpr Foundry Co Apparatus for cleaning castings and the like.
US1706737A (en) * 1923-09-19 1929-03-26 American Foundry Equip Co Sand-blast tank and filling valve
US1940539A (en) * 1932-06-08 1933-12-19 Fritsche Rudolf Device for making corrections on lithographic printing surfaces
US2200587A (en) * 1937-02-25 1940-05-14 Hydroblast Corp Method and apparatus for sand blasting
US2388818A (en) * 1944-10-10 1945-11-13 Edwin C Bick Regulating and reducing adapter for sandblast machines
US2455514A (en) * 1945-08-02 1948-12-07 William H Mead Surface treating method and apparatus
US2613482A (en) * 1949-11-26 1952-10-14 Karl F Hamacher Wet blasting apparatus
US3212217A (en) * 1963-05-28 1965-10-19 Tex Tube Inc Cleaning device
US3256642A (en) * 1963-11-07 1966-06-21 Rocco P Fonti Underwater sandblasting gun

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US999485A (en) * 1910-09-15 1911-08-01 Entpr Foundry Co Apparatus for cleaning castings and the like.
US1706737A (en) * 1923-09-19 1929-03-26 American Foundry Equip Co Sand-blast tank and filling valve
US1940539A (en) * 1932-06-08 1933-12-19 Fritsche Rudolf Device for making corrections on lithographic printing surfaces
US2200587A (en) * 1937-02-25 1940-05-14 Hydroblast Corp Method and apparatus for sand blasting
US2388818A (en) * 1944-10-10 1945-11-13 Edwin C Bick Regulating and reducing adapter for sandblast machines
US2455514A (en) * 1945-08-02 1948-12-07 William H Mead Surface treating method and apparatus
US2613482A (en) * 1949-11-26 1952-10-14 Karl F Hamacher Wet blasting apparatus
US3212217A (en) * 1963-05-28 1965-10-19 Tex Tube Inc Cleaning device
US3256642A (en) * 1963-11-07 1966-06-21 Rocco P Fonti Underwater sandblasting gun

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3888054A (en) * 1973-11-16 1975-06-10 Western Electric Co Method for abrasive cutting in a liquid
DE2736762A1 (en) * 1976-08-16 1978-02-23 Union Carbide Corp Method and device for metering of abrasive
EP0025156A1 (en) * 1979-08-22 1981-03-18 Myers-Europe Pumpen GmbH Method and apparatus for wet abrasive blasting
US4548001A (en) * 1980-05-16 1985-10-22 John Link Cleaning apparatus and method
US4545317A (en) * 1981-04-01 1985-10-08 Gkss-Forschungszentrum Geesthacht Gmbh Device for treating the surfaces of structures and ships
US4562612A (en) * 1983-08-29 1986-01-07 Williams Raymond F Fluid-driven transducer vacuum tool
EP0164914A1 (en) * 1984-05-15 1985-12-18 N.I.S. Engineering Limited Jet cleaning operation
US4707951A (en) * 1985-02-04 1987-11-24 Carboxyque Francaise Installation for the projection of particles of dry ice
WO1986004536A1 (en) * 1985-02-04 1986-08-14 Carboxyque Française Plant for projecting particles of carbon dioxide ice
FR2576821A1 (en) * 1985-02-04 1986-08-08 Carboxyque Francaise Installation for spraying dry ice particles
DE3536138C1 (en) * 1985-10-10 1987-03-26 Schubert Werner Pipe-cleaning device with nozzle head
US5065551A (en) * 1988-03-02 1991-11-19 Cleaning Technology Limited Abrasive cleaning or cutting
DE19909377A1 (en) * 1999-03-04 2000-09-14 Kurt Hoerger Method for cutting and clearing blockages in accessible or non-accessible pipelines uses abrasive water jet pumped through nozzle at minimum pressure of 100 bar
DE19909377C2 (en) * 1999-03-04 2002-03-21 Kurt Hoerger Method and apparatus for cutting and removal of obstructions or deposits in non-accessible and accessible pipes or channels
US20040005849A1 (en) * 2000-10-20 2004-01-08 Ant Applied New Technologies Ag Method for filling a pressure container and device for producing a jet of a suspension
US6857944B2 (en) * 2000-10-20 2005-02-22 Ant Applied New Technologies Ag Method for filling a pressure container and device for producing a jet of a suspension
WO2005039825A1 (en) * 2003-10-24 2005-05-06 Watech As A method and a device for surface cleaning
CN100582966C (en) 2004-12-20 2010-01-20 劳力士有限公司 Timepiece dial and processes for manufacturing this dial
US20070105486A1 (en) * 2005-11-09 2007-05-10 Oceaneering International, Inc. Subsea abrasive jet cutting system and method of use
US7258597B2 (en) * 2005-11-09 2007-08-21 Oceaneering International, Inc. Subsea abrasive jet cutting system and method of use
US20170151651A1 (en) * 2012-09-25 2017-06-01 Paul L. Miller Abrasive Entrainment Waterjet Cutting
US20140094093A1 (en) * 2012-09-25 2014-04-03 Paul L. Miller Underwater Abrasive Entrainment Waterjet Cutting
US9446500B2 (en) * 2012-09-25 2016-09-20 G.D.O. Inc. Underwater abrasive entrainment waterjet cutting method
US20140087637A1 (en) * 2012-09-25 2014-03-27 Paul L. Miller Abrasive Waterjet Cutting System For Subsea Operations
US20170151650A1 (en) * 2012-09-25 2017-06-01 Paul L. Miller Abrasive Entrainment Waterjet Cutting
US20170157743A1 (en) * 2012-09-25 2017-06-08 Paul L. Miller Apparatus for Underwater Abrasive Entrainment Waterjet Cutting
US9744643B2 (en) * 2012-09-25 2017-08-29 G.D.O. Inc Apparatus for underwater abrasive entrainment waterjet cutting
US9744645B2 (en) * 2012-09-25 2017-08-29 G.D.O. Inc. Abrasive entrainment waterjet cutting
US9815175B2 (en) * 2012-09-25 2017-11-14 G.D.O. Inc Abrasive entrainment waterjet cutting
US20180043505A1 (en) * 2016-08-15 2018-02-15 Paul L. Miller Abrasive Entrainment Waterjet Cutting
US20180080734A1 (en) * 2016-08-15 2018-03-22 Paul L. Miller Abrasive Entrainment Waterjet Cutting

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