Patent Grant
9193427
The present embodiments generally relate to a floating vessel with improved bow and/or stern thrusters and a dual fuel version of the floating vessel with an improved gas line trap.
A need exists for a floating vessel with improved thrust capacity in bow and stern thrusters while simultaneously reducing vibration in the bow and stern thrusters.
A further need exists for a dual fuel floating vessel, such as a ship, with improved gas line traps.
The present embodiments meet these needs.
The detailed description will be better understood in conjunction with the accompanying drawings as follows:
The present embodiments are detailed below with reference to the listed Figures.
Before explaining the present apparatus in detail, it is to be understood that the apparatus is not limited to the particular embodiments and that it can be practiced or carried out in various ways.
The embodiments generally relate to a floating vessel with improved bow and/or stern thrusters, and a dual fuel version of the floating vessel with an improved gas line trap.
The embodiments, further relate to a floating vessel configured to move through the water at a speed of up to 15 knots.
The floating vessel can be an ocean going barge with thrusters, an oceanographic research vessel, a dredge, a tanker, a cruise ship, a yacht, a ferry, or any floating vessel applicable to the embodiments.
In embodiments, the floating vessel can be a platform supply vessel having a length of 302 feet.
The floating vessel can have a hull. The hull can be a monohull, a catamaran hull, a trimaran hull, a plurality of pontoons connected together, or a circular hull.
At least one thruster tube can be formed in the hull.
A water moving device and power supply can be installed in each thruster tube.
At least one appendage can be installed on the hull. The at least one appendage can partially surround each thruster tube and can encircle from 30 percent to 40 percent of each thruster tube without closing or restricting the thruster tube opening.
A plurality of supports can be used to secure each appendage to the hull around the thruster tube opening.
A fairing plate can be installed between a tangent of each appendage and the hull following a circumference of each thruster tube which can additionally encircle from 30 percent to 40 percent of each thruster tube.
Each fairing plate can be configured to transition water flow from the hull over one of the appendages and into the at least one thruster tube to reduce water turbulent flow across an opening of each thruster tube as water is moved by each water moving device creating a 2 percent improvement in thrust capacity.
A benefit of the appendage is that more thrust can be achieved from the water moving device imparted to the hull using the appendage.
A benefit of the appendage is that less vibration can be generated from water moved by the water moving device when the appendage is mounted around the opening to the thruster tubes on the outside of the hull.
A benefit of the appendage is that thruster vibration can be reduced from 70 percent to 90 percent when the thruster is running from 500 rpm to 700 rpm.
A benefit of the appendage is that thruster vibration can be reduced from 20 percent to 60 percent when the thruster is running from 800 rpm to 890 rpm.
A benefit of the appendage is that greater reductions in vibrations occur when the thruster tubes are shorter.
A benefit of the appendage is that reduction in cavitation of the water moving device increases as the thruster tubes are shortened.
Turning now to the Figures,
A floating vessel 10 can be configured to move through the water at a speed of up to 15 knots can have a hull 12, a bow 101 and a stern 102.
In embodiments, the hull shape can be round, without bow or stern, or in the form of a plurality of columns connected together with supports.
The floating vessel 10 can be depicted as a dual fuel vessel with a dual fuel propulsion system 104. In embodiments, the floating vessel can have a liquefied natural gas storage tank 43.
The floating vessel 10 can include a dynamic positioning controller 64, which can be connected to both a global positioning system network 65 and a plurality of gyroscopes 66 mounted in the hull.
In embodiments, the dynamic positioning controller 64 can communicate with at least one water moving device, which is described in detail in
A first thruster tube 14a and a second thruster tube 14b can be mounted near the bow of the floating vessel. At least one thruster tube can be formed in the hull 12.
The embodiments, the invention can be used on thrusters which can be mounted in the thruster tubes that are either proximate to the bow or proximate to the stern of the floating vessel.
Thrusters tubes 14a and 14b can be mounted almost anywhere on the floating vessel, even near a midpoint, if the thrusters are used for docking a large floating vessel without a tug. The embodiments can be usable on all thrusters formed in the hull of the floating vessel, such as from a 30 foot to 1,000 foot vessel.
In embodiments, the invention can be used on the cowling of portable thruster tubes, such as those which can be removably mounted to barges without intrinsic power of their own.
Each thruster tube 14a and 14b can have an opening.
A first water moving device 24a can be disposed in the first thruster tube 14a and a second water moving device 24b can be disposed in the second thruster tube 14b.
A first power supply 25a can supply power to the first water moving device 24a. In embodiments, the first power supply 25a can be mounted in the first thruster tube 14a.
A second power supply 25b can supply power to the second water moving device 24b. In embodiments, the second power supply 25b can be mounted in the second thruster tube 14b.
The “water moving devices” as used herein can be non-moving propeller thrusters, but small jets, and small rotatable pods with propellers can be used as well as the water moving devices.
The first thruster tube 14a can have a first opening 15a and the second thruster tube 14b can have second opening 15b.
The first and second openings 15a and 15b can range from 6 inches to several feet in diameter. Each thruster tube 14a and 14b can have a diameter from 0.3 meters to 5 meters.
In embodiments, the thruster openings can be in a shape of an ellipse at a water/hull interface.
A first appendage 16a can partially surround the first thruster tube 14a, which can encircle the first thruster tube from 30 percent to 40 percent of the first thruster tube 14a.
A second appendage 16b can partially surround the second thruster tube 14b, which can encircle the second thruster tube from 30 percent and 40 percent of the second thruster tube 14b.
In embodiments, each appendage 16a and 16b can be a half-pipe.
In further embodiments, the half-pipe can be a 12 inch long pipe for thrusters that have a diameter of 36 inches.
In embodiments, if at least two thruster tubes 14a and 14b are present on a side of the floating vessel, the appendage can be mounted around the thruster tube on the same lower portion, in an orientation that is closest to the keel.
In embodiments, both appendages 16a and 16b can have the same identical length. In embodiments, when the first thruster tube 14a is slightly larger than the second thruster tube 14b, the two appendages 16a and 16b can have slightly different lengths, but the thruster tube opening can be larger.
The first thruster tube 14a can have a first bow tapered plate 80a and a first stern tapered plate 81a connected to the first appendage 16a, which is shown as a half-pipe.
The second thruster tube 14b can have a second bow tapered plate 80b and a second stern tapered plate 81b connected to the second appendage 16b, which is also shown as a half-pipe.
Each appendage can have a bow tapered plate 80a and 80b and a stern tapered plate connected on opposite ends of the at least one appendage 16a and 16b.
In embodiments, the pipe of the half-pipe can be 1 inch diameter stock at the intersection of the tapered end plates and each appendage.
A knuckle plate 83 can be secured between the first appendage 16a and the second appendage 16b for reducing vibration as well as a tapered mid plate 82 connecting the first stern tapered plate 81a and the second bow tapered plate 80b.
In embodiments, thee knuckle plate 83 can be a ½ of an inch plate in thickness and fill the space between the two appendages 16a and 16b on at least one thruster tube.
In embodiments, a knuckle plate is not needed for a single thruster tube with a single appendage.
A first fairing plate 20a can be installed so that the first fairing plate 20a can have an edge that follows a circumference of the first thruster tube 14a. Like the first appendage 16a, the first fairing plate 20a can encircle the first thruster tube from 30 percent to 40 percent.
The first fairing plate 20a can be configured to transition water flow from the hull 12 over the appendage 16a and into the first thruster tube 14a to reduce water turbulent flow across the thruster tube opening as water can be moved by that thruster tube's water moving device creating at least a 2 percent improvement in thrust capacity of the water moving device than the water moving device otherwise provides without the appendage.
A second fairing plate 20b can be installed so that the second fairing plate 20b can have an edge that follows the same portion of the circumference of the second thruster tube 14b. Like the second appendage 16b, the second fairing plate 20b can encircle the second thruster tube from 30 percent to 40 percent.
A fairing transition plate 26 can connect the first fairing plate 20a and the second fairing plate 20b. In embodiments, the fairing transition plate 26 can have a thickness of 1.5 inches.
In embodiments, the fairing plates can have a ⅜ inch thickness.
In embodiments, the fairing transition plate can be ½ inch thick.
The first fairing plate 20a can be attached to the hull 12 with at least one support 18 attached at a tangent 22 to the first appendage 16a.
The at least one support 18 can be used to secure the appendage to the hull of the floating vessel.
In embodiments, the at least one support 18 can be 10 inches high and 19 inches long and solid plate steel. In embodiments, a plurality of supports can be used.
The second appendage 16b is presented as a half-pipe, wherein the half-pipe can be formed from a group of segments 36a, 36b, and 36c joined to form a one piece integral half-pipe.
In embodiments, the appendages can be made from fiberglass, carbon fiber, steel, stainless steel, or combinations thereof. In further embodiments, the appendages can be coated with a marine fouling coating.
In this dual fuel version of the floating vessel, a relief gas line vent trap 40 can be installed in a main relief line 42 connected to a liquefied natural gas storage tank or a liquefied natural gas bunker station 44, as shown in this Figure.
The relief gas line vent trap 40 can have a gas inlet pipe 50 with an angle of declination 57 from the main relief line 42 to prevent back up of water into the main relief line 42.
The relief gas line vent trap 40 can have a body 52 with a top 53, wherein the body 52 can fluidly connect to the gas inlet pipe 50.
The top 53 can be configured to align with a plane 62, which can be angled from 10 degrees to 40 degrees from a vertical axis of the body that extends through the drain 58.
The body 52 can have a reservoir 54 for receiving fluid from the gas inlet pipe 50.
The body 52 can have a hinged balanced lid 56 secured to the body 52 opposite the reservoir 54 which can close over the top 53.
The hinged balanced lid can be configured to minimize gas escaping from the body 52 and to simultaneously reduce back pressure caused by the gas.
In embodiments, the drain 58 can be fluidly connected to the reservoir 54 to allow fluid from the gas inlet pipe 50 to exit the body 52.
In embodiments, the angle of declination 57 can be from 40 degrees to 50 degrees from a central axis of the main relief line 42 to prevent back up of water into the main relief line 42.
In embodiments, the body 52 and the gas inlet pipe 50 can be made from stainless steel. The body 52 and gas inlet pipe 50 can be configured to enable cryogenic fluids to pass through the gas inlet pipe 50 and body 52 without the gas inlet pipe 50 and body 52 cracking or rupturing.
The relief gas line vent trap 40 can include a stop 60 to prevent the hinged balanced lid 56 from opening more than 90 degrees from the plane 62 of the top 53.
A screen 63 can also be secured in the body 52 to prevent particulate from flying out of the body 52.
While these embodiments have been described with emphasis on the embodiments, it should be understood that within the scope of the appended claims, the embodiments might be practiced other than as specifically described herein.
| Number | Name | Date | Kind |
|---|---|---|---|
| 3835805 | Slade | Sep 1974 | A |
| 6286447 | Beauchamp et al. | Sep 2001 | B1 |
| 7108569 | Cornell | Sep 2006 | B2 |
