KR101408779B1 - A structure of locating nozzles for a burner boom water spray system of an offshore plant - Google Patents

Abstract

The present invention relates to a structure for arranging a water spray nozzle of a burner boom in an offshore plant and, more specifically, a structure for arranging a water spray nozzle of a burner boom in an offshore plate, capable of efficiently blocking a high heat source generated when waste gas, which is generated in a crude oil boring process, is combusted. In accordance with an embodiment of the present invention, the structure for arranging a water spray nozzle of a burner boom in an offshore plate includes a water transfer pipe providing predetermined water pressure and first to third nozzles discharging water by being installed in the water transfer pipe in an inverted triangle shape. The first and second nozzles are located on the same horizontal plane line by being separated at predetermined intervals, and the third nozzle is located in a lower position than the horizontal plane line of the first and second nozzles by being vertically extended from the center of the horizontal plane line.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an off-shore plant burner boom water spray nozzle arrangement structure,

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to an arrangement structure of an offshore plant burner boom water spray nozzle, and more particularly, to an offshore plant burner boom water treatment apparatus capable of more effectively shielding a high heat source generated when burning off- Spray nozzle arrangement structure.

In general, unlike general ships, offshore plants with fixed, floating, or flexible structures operate from 3 to 30 years after they are installed at the oil or gas extraction point, which makes the design considerations very difficult , Various climatic effects such as wind and waves, and special environmental conditions in the sea, as well as the production of petroleum products, require a variety of difficult and high-tech techniques related to ensuring stability against fire and explosion.

Recently, due to the increase in demand for petroleum resources development in the deep sea area of more than 1,000 meters, various technologies have been secured and developed. In addition, the drilling, production, and storage are performed simultaneously There is a growing interest in the demand and development of multi-purpose offshore plants.

Currently, oceanic plant design technology for oil and gas resources and offshore plant technology for marine space utilization should be secured in the first place in time, which is relatively high in domestic industrial base and technology level. It is expected that the concentration of technology investment and its ripple effect will be high.

Particularly, the off-shore boom water spray nozzle exhaust structure proposed in the present invention is one of the water-based fire-extinguishing systems of a burner boom for an offshore plant, and is generated when burning offgas generated during submarine crude drilling Is a device for protecting the hull, equipment and human life by using high-pressure water (fine droplets, mist) emitted from the nozzle.

Figs. 1 to 3 show photographs explaining a practical use of a burner boom water spray nozzle arrangement structure which is generally used.

As can be seen from the drawings, the burner boom water spray nozzle arrangement structure is a device for protecting the hull, equipment and human life from the combustion of waste gas during petroleum drilling operations, and includes nozzles for spraying fine water, A water curtain pipe member for forming a predetermined water curtain by using water sprayed through the water curtain pipe, and a pump.

In operation, when the pump is operated, the water supplied through the pipe member is radiated as fine water through the nozzle, and various types of water curtains are formed depending on the shape of the nozzle or the structure of the pipe member in which the nozzle is disposed.

However, the burner boom water spray nozzle arranging structure disclosed in the prior art has a drawback that most of the water curtain for heat shielding does not have the shape of the hole formed in the nozzle tab falling out of the classical form, A plurality of nozzle tabs have a disadvantage in that they can not perform an efficient water curtain function because they follow the classical form.

Korean Patent Application No. 10-2009-0000991 Korean Utility Model Application No. 20-2001-0032477

SUMMARY OF THE INVENTION It is an object of the present invention to provide a marine plant burner boom water spray nozzle arrangement structure having a nozzle tab that improves the injection efficiency in place of the conventional nozzle type taps.

It is another object of the present invention to provide a marine plant burner boom water spray nozzle arrangement structure in which a plurality of nozzle taps are arranged in a two-stage fashion on a side surface of a nozzle in order to efficiently form a water curtain.

A preferred embodiment of the arrangement structure of a marine plant burner boom water spray nozzle proposed in the present invention is a water spray pipe for providing a predetermined water pressure and a first to third nozzles installed in the inverted triangular shape in the water feed pipe to radiate water Wherein the first nozzle and the second nozzle are spaced apart from each other by a predetermined distance on the same horizontal plane and the third nozzle is perpendicular to the center of the horizontal plane at a position lower than the horizontal plane of the first and second nozzles Wherein the first to third nozzles are formed with a first nozzle tab at a center thereof and a plurality of second nozzle tabs formed at a lower side of the front jet portion, And a plurality of third nozzle tabs formed on the lower side of the first side jetting part, And a fastening portion formed on a lower side of the second side injection portion and coupled to a member for supplying the fluid for introducing the nozzle, wherein the fastening portion is formed at a lower portion of the first side spray portion and the second side spray portion, The side surface is inclined at a predetermined angle from the upper end to the lower end.

In a preferred embodiment of the present invention, the horizontal cross section of the first side spray portion and the second side spray portion is annular and has the same size, but some modifications are possible.

In a preferred embodiment of the present invention, the plurality of second nozzle tabs and the plurality of third nozzle tabs are preferably arranged in an alternating arrangement manner, but are not limited thereto.

In a preferred embodiment of the present invention, each of the plurality of second nozzle tabs is combined with a plurality of tapped holes formed in a side surface of the first side jet portion, and each of the plurality of third nozzle tabs And is preferably coupled with a plurality of tapped holes formed on the side surface.

In a preferred embodiment of the present invention, the plurality of second nozzle tabs and the third nozzle tabs each have a hole at the center of the front surface thereof, through which fluid introduced through each corresponding tapped hole is injected, and a pupil- And the pupil-shaped grooves are formed by being sloped about the hole.

In a preferred embodiment of the present invention, the plurality of second nozzle tabs and the pupil-shaped grooves formed in the third nozzle tab are inclined in a range of 5 to 20 degrees with the nozzle maintained in a horizontal state But it is possible to design variously according to the inclination of the tapped hole.

It is possible to more effectively shield the flames of the waste gas coming from the seabed when the marine plant burner boom water spray nozzle arrangement structure proposed in the present invention is used.

In particular, the nozzle used in the present invention can provide an efficient water curtain pattern by providing the two-stage side jetting portion in addition to the front jetting portion, and by forming a cut groove in the nozzle tab, It is possible to widen the scattering range and to effectively block the high heat radiated from the waste gas generated during the drilling operation.

Figs. 1 to 3 are photographs for explaining an example of a practical use state and a basic operation of a burner boom water spray system which is generally used. Fig.
Fig. 4 is an overall conceptual view of a fire test conducted using the structure proposed in the present invention.
5 to 8 are a perspective view, a side view, a plan view, and a rear view of the straight nozzle arrangement structure.
9 to 12 are a perspective view, a side view, a plan view and a rear view of the triangular nozzle arrangement structure.
13 to 16 are a perspective view, a side view, a plan view, and a rear view of an inverse triangular nozzle arrangement structure.
FIGS. 17 to 20 are views showing the radiation pattern of water discharged through the nozzle when the water supply pressure is 5 bar according to the perspective view, the side view, the plan view, and the rear view of the linear nozzle arrangement structure shown in FIGS.
FIGS. 21 to 24 are views showing the radiation pattern of water discharged through the nozzle when the water supply pressure is 6 bar according to a perspective view, a side view, a plan view, and a rear view of the linear nozzle arrangement structure shown in FIGS. 5 to 8 .
FIGS. 25 to 28 are views showing the radiation pattern of water discharged through a nozzle when the water supply pressure is 5 bar according to a perspective view, a side view, a plan view, and a rear view of the triangular nozzle arrangement structure shown in FIGS.
FIGS. 29 to 32 are views showing the radiation pattern of water discharged through the nozzle when the water supply pressure is 6 bar according to a perspective view, a side view, a plan view, and a rear view of the triangular nozzle arrangement structure shown in FIGS. 9 to 12 .
FIGS. 33 to 36 show the radiation pattern of water discharged through the nozzle when the water supply pressure is 5 bar according to a perspective view, a side view, a plan view, and a rear view of the inverted triangular nozzle arrangement structure shown in FIGS. 13 to 16 , FIGS. 37 to 40 show the radiation pattern of the water discharged through the nozzle when the water supply pressure is 6 bar according to the perspective view, the side view, the plan view, and the rear view of the inverted triangular nozzle arrangement structure shown in FIGS. FIG.
43 to 52 show an embodiment of a marine plant burner boom water spray nozzle proposed in the present invention.
Fig. 53 is a view for explaining a state in which the nozzle taps of the nozzles proposed in the present invention are inclined. Fig.
FIG. 54 shows flame blocking performance comparison data according to the arrangement structure proposed in the present invention. FIG.

Hereinafter, a specific technical idea of the arrangement structure of the sprayer nozzle boom water spray nozzle proposed in the present invention will be described with reference to the drawings.

Before proceeding with the description, it is to be understood that the present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail.

It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

On the other hand, terms such as first, second, A, B, a, b, and the like can be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Should not.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.

Fig. 4 is an overall conceptual view of a fire test conducted using the structure proposed in the present invention.

As shown in the figure, the main test equipment for the fire test is a gas burner for flame generation, a gas supply device for supplying gas to the gas burner, a radiant heat measurement device for measuring radiant heat generated by the flame, A pressurized water delivery device for supplying water at a predetermined pressure, a thermal imaging camera, and a test control system for controlling them entirely.

The nozzle arrangement structure used in the present invention radiates the water supplied through the pressurized water supply and reception device through nozzles provided in the nozzle arrangement structure. In the present invention, three structures are manufactured according to the arrangement of the nozzles.

The first structure is a straight structure, in which the three nozzles are arranged on the same horizontal plane (see Fig. 5)

The second structure is a triangular structure, in which the nozzles of the second two are spaced apart from each other by a predetermined distance, and the other one of the nozzles is located at a position higher than the nozzle so as to protrude in a direction perpendicular to the center on the horizontal plane )ego,

The third structure is an inverted triangular structure, which is located at a predetermined distance from two identical horizontal planes, and the other nozzle is located at a position lower than the horizontal plane and further extending in the vertical direction from the center of the horizontal plane 13).

5, 9, and 13, the water (supply water) supplied through the pressurized water supply and reception apparatus flows into the lower end portion of the water supply pipe forming the body portion and is radiated through the three nozzles formed in the upper portion.

An example of a disaster prevention or thermal efficiency test procedure using such a nozzle arrangement structure is as follows.

<Test procedure>

(1) The test is divided into three methods according to the nozzle arrangement.

(2) A gas burner (fire model) is ignited to generate a flame.

(3) Maintain the flame intensity according to test conditions to be stabilized.

(4) Measure the radiant heat and temperature of the flame generated from the gas burner (fire model).

(5) Measure the radiant heat and temperature of the flame generated from the gas burner (fire model) while radiating water at a radiation pressure of 0.5 MPa or 0.6 MPa from the structure.

(6) Record the flame distribution according to the intensity of the flame with an infrared camera.

<Test execution>

The fire test was carried out 36 times according to the test procedure under the following conditions.

(1) Flame intensity: 3 (1.0 MW, 2.0 MW, 3.0 MW)

(2) Distance between structure and radiant heat measuring device: 4 (1.5 m, 2.0 m, 2.5 m, 3.0 m)

(3) Height from the bottom of the radiant heat measuring apparatus: three (0.54 m, 2.00 m, 2.55 m)

(4) Condition of test specimen installation: 3 types (straight, triangle, inverted triangle)

FIGS. 5 to 8 are a perspective view, a side view, a plan view, and a rear view, respectively, of the straight nozzle arrangement structure, FIGS. 9 to 12 are a perspective view, a side view, a plan view, and a rear view, respectively, A side view, a plan view, and a rear view of an inverted triangular nozzle arrangement structure.

In the present invention, a pattern is sprayed to each of the nozzles through a water supply pipe forming a body by supplying water at a predetermined pressure from the bottom.

17 to 20 illustrate the radiation pattern of water discharged through the nozzle when the water supply pressure is 5 bar according to a perspective view, a side view, a plan view, and a rear view of the linear nozzle arrangement structure shown in Figs. 5 to 8 ego,

FIGS. 21 to 24 are views showing the radiation pattern of water discharged through the nozzle when the water supply pressure is 6 bar according to a perspective view, a side view, a plan view, and a rear view of the linear nozzle arrangement structure shown in FIGS. 5 to 8 .

25 to 28 illustrate the radiation pattern of water discharged through the nozzle when the water supply pressure is 5 bar according to a perspective view, a side view, a plan view, and a rear view of the triangular nozzle arrangement structure shown in Figs. 9 to 12 29 to 32 show the radiation pattern of water discharged through the nozzle when the water supply pressure is 6 bar according to a perspective view, a side view, a plan view, and a rear view of the triangular nozzle arrangement structure shown in Figs. 9 to 12 FIG.

33 to 36 show the radiation pattern of the water discharged through the nozzle when the water supply pressure is 5 bar according to a perspective view, a side view, a plan view, and a rear view of the inverted triangular nozzle placement structure shown in Figs. 13 to 16 37 to 40 show the radiation pattern of the water discharged through the nozzle when the water supply pressure is 6 bar according to the perspective view, the side view, the plan view, and the rear view of the inverted triangular nozzle arrangement structure shown in Figs. Fig.

As shown in the drawings, in the present invention, the spray pattern and the flow characteristics of water according to the arrangement structure of the nozzles are predicted, and spraying (or also radiation) from the nozzles predicts the highest heat shielding effect of the flame by spraying A flow analysis was performed to select the placement geometry.

In order to compare the heat shielding effect of the flame according to the arrangement shape, the volume of the entire area in which the water particles are distributed is calculated, and the surface area of the spray pattern is expressed by the ISO Surface to obtain the area and compared.

As a result of the flow analysis according to the arrangement shape, it was observed that the surface area of the spray pattern reached by the water particles and the volume of the region where the water is distributed were larger as the water feed pressure was higher, and the highest jet velocity of the water particles calculated through the flow analysis The feed pressure of the triangular arrangement structure was observed at 6 [bar] to 44.1321 [m / s].

The surface area of the spray pattern was calculated as 849.542 [m 2] when the operating pressure was 6 [bar] in the inverse arrangement of triangular arrangement, and the largest surface area was calculated as 571.634 [m 3] And the reverse triangular arrangement structure has the largest surface area and volume in comparison with other shapes even when the operating pressure is 5 [bar].

As a result of observation of the spray pattern, the maximum spray height was found to be the highest at 8.89 [m] at the water feed pressure of 6 [bar] in the shape of the triangular arrangement structure, but the amount of spray reaching the maximum height .

As a result of comparing the spray pattern surface area, water particle distribution area and nozzle spray height, the heat shielding effect of the flame according to the arrangement shape shows the best performance when the feed water pressure is 6 [bar] .

41 is a view showing a radiation pattern of water radiated by using the nozzle proposed in the present invention at a water supply pressure of 5 bar and FIG. Fig. 6 is a view showing a radiation pattern of water to be radiated. Fig.

As can be seen from Figs. 41 and 42, it can be seen that the range and speed of the radiation pattern becomes wider and faster as the feed water pressure increases.

Next, Figs. 43 to 53 are views for explaining the nozzles used in the structure according to the present invention.

Fig. 43 is an external perspective view of the nozzle used in the arrangement structure of a marine plant burner boom water spray nozzle proposed in the present invention, Fig. 44 is a front view of the nozzle of the present invention shown in Fig. 43, 46 is a plan view of the nozzle according to the present invention shown in Fig. 43, with the nozzle tab removed. Fig. 47 is a front view of the nozzle shown in Fig. 46, 48 is a bottom view of the nozzle shown in Fig. 48, Fig. 50 is a horizontal cross-sectional view taken along line A-A 'of the nozzle shown in Fig. 47, FIG. 52 is a vertical sectional view of the nozzle shown in FIG. 47, and FIG. 53 is a view for explaining a state in which the nozzle tab of the nozzle proposed in the present invention is inclined.

43 to 45, the configuration of the spray nozzle of a marine plant burner boom water according to the present invention includes a front spray part 200, a first side spray part 300, a second side spray part 400 And a connecting portion 500. [0050]

The front-side spray part 200 in the shape of a circular plate is located at the uppermost end of the nozzle, and a nozzle tab 201 for spraying a fluid (e.g., water) is mounted at the center thereof.

The first side spray part 300 is formed on the lower side of the front spray part 200 and a plurality of nozzle taps 301, 302, ... are laterally arranged at regular intervals.

As shown in FIG. 46, the plurality of nozzle tabs 301, 302,... Are coupled with the tab holes 31, 32, .. formed in the first side spray portion 300. The coupling method is preferably a screw coupling method, and a nut or the like may be used incidentally. It is also possible to use a sealing resin or the like in order to fill a gap or the like at the time of bonding.

Next, the second side spray portion 400 is formed on the lower side of the first side spray portion 300, and a plurality of nozzle tabs 401, 402,...

As shown in FIG. 46, the plurality of nozzle tabs 401, 402,... Are coupled with the tab holes 41, 42, ... formed in the second side spray portion 400.

The coupling method is preferably a screw coupling method, and a nut or the like may be used incidentally, and it is also possible to use a sealing resin or the like in order to fill a gap or the like at the time of coupling.

Each of the side surfaces of the first side spray portion 300 and the second side spray portion 400 is inclined at a predetermined angle from the upper end to the lower end of the first side spray portion 300. The horizontal end surface has an annular shape and the same size, Or the size may be varied as needed.

The side inclination angles of the first and second side spray portions 300 and 400 are used to form an efficient water curtain pattern. The side inclination angles can be designed in various ways according to the inclination of the protrusions 31, 32,..., 41, 42,.

As can be seen from the drawing, the corresponding taps 31, 32, ..., 41, 42, ... are provided in the center of the front surface of each of the plurality of nozzle taps 301, 302, A groove through which the introduced fluid is injected and a pupil-shaped groove surrounding the hole are formed.

The pupil-shaped groove is sloped about the hole. More specifically, it is sloped from the outer rim of the pupil-like shape toward the center line with respect to the center line crossing the hole.

The reason for forming the pupil-shaped grooves in this manner is that it is possible to form a water curtain pattern more efficiently than in the case where the grooves are not formed. As a result of several experiments, the pupil- (See Fig. 53).

Finally, a coupling part 500 is formed on the lower side of the second side spray part 400 for guiding the flow of the fluid (e.g., water) in combination with the member for supplying the fluid for introducing the nozzle.

Figs. 46 to 49 are an external view, a front view, a plan view, and a bottom view after removing the nozzle tabs 201, 301, 302, ..., 401, 402,.

As shown in the figure, a tapped hole 21 is formed at the center of the front spray part 200, and a plurality of tapped holes 31, 32, ... are formed on a side surface of the first side spray part 300 , And a plurality of tapped holes (41, 42, ...) are formed on the side surface of the second side spray portion (400).

The fluid introduced through the opening formed in the bottom surface of the coupling part 500 passes through the tapped holes 21, 31, 32, .., 41, 42, .., Through the corresponding nozzle tabs 201, 301, 302,..., 401, 402,.

50 to 52 are a horizontal sectional view of the first side injection part 300 and the second side injection part of the nozzle shown in FIG. 47, and a vertical sectional view of the nozzle.

50 and 51, the penetration length of the tapped holes 31, 32, ... formed in the first side spray portion 300 is smaller than the penetration length of the tapped holes 41, 42, ... formed in the second side spray portion 400. ., &Lt; / RTI &gt; This is because the fluid introduced through the opening formed in the bottom surface of the coupling part 500 is more efficiently transferred to the first side spray part 300.

The positions of the tab holes 31, 32 ... formed in the first side spray portion 300 and the tab holes 41, 42 ... formed in the second side spray portion 400 are mutually arranged have. That is, it is formed in a zigzag manner. This is because the water curtain pattern formed by the fluid sprayed through the first side spray part 300 and the water curtain pattern formed by the fluid dispersed through the second side spray part 400 are different from each other Called dead zone region that the water curtain pattern formed by the first side jetting portion 300 can not cover.

That is, in the present invention, in order to solve the problem of the conventional general nozzle having only one side jet portion, the side jet portions 300 and 400 are arranged in two stages to form a more efficient water curtain pattern, It is possible to more effectively reduce the dead zone area as compared with the conventional nozzle having only the side jet part of the nozzle.

As described above, the above-described nozzle for a marine plant burner boom water spray system according to the present invention can provide an efficient water curtain pattern by providing the two-stage side injection part in addition to the front spray part, It is possible to widen the scattering range of the fluid sprayed through the nozzle tab, thereby effectively shielding the high heat radiated from the waste gas generated during the drilling operation.

As described above, various structures for a spray nozzle nozzle arrangement for a marine plant are proposed using the nozzles proposed in the present invention, and the optimal use structure of the nozzle proposed in the present invention is experimented.

In the present invention, triangular and inverted triangular arrangement structures have been studied in depth, while the existing nozzle arrangement structures have been largely flat-shaped. In the present invention, further efforts are being made to develop superior technologies capable of competing with foreign advanced companies in exporting offshore plants.

As a result of various efforts such as the present invention, it has been found that the triangular or inverted triangular nozzle arrangement structure of the present invention, which is obtained as a result of such efforts, Respectively.

In particular, as can be seen from FIG. 54, which is comparative data of flame blocking performance, it is found that flame blocking performance is the best in the inverted triangular arrangement structure although there is some difference according to the distance from the flame.

Meanwhile, although the nozzle arrangement structure limited by the present invention is related to the triangular or inverted triangular arrangement structure in technical features, various arrangements can be proposed using the nozzles proposed in the present invention.

200: front splitter
201: Nozzle tab
300: first side jetting part
301, 302, ...: Nozzle tab
31, 32, ..: tap hole
400: second side jetting portion
401, 402, ...: Nozzle tab
41, 42, ..: tap hole
500: fastening portion

Claims (6)

In an offshore plant burner boom water spray nozzle arrangement,
A water feed pipe for providing a predetermined water pressure,
And first to third nozzles provided in the water feed pipe in an inverted triangular shape to emit water,
Wherein the first nozzle and the second nozzle are spaced apart from each other by a predetermined distance on the same horizontal plane,
Wherein the third nozzle is further extended in a direction perpendicular to the center of the horizontal plane at a position lower than a horizontal plane of the first and second nozzles,
Each of the first to third nozzles
A first side spray portion formed at a lower side of the front spray portion and having a plurality of second nozzle tabs arranged laterally at a predetermined interval; and a second side spray portion formed on a lower side of the first side spray portion And a plurality of third nozzle tabs disposed laterally at a predetermined interval, and a coupling part formed at a lower side of the second side injection part and coupled to a member for supplying the fluid for introducing the nozzle, Wherein each side surface of the first side spray portion and the second side spray portion is inclined at a predetermined angle from an upper end to a lower end of the boom water spray nozzle arrangement structure. The method according to claim 1,
Wherein the horizontal cross-section of the first side spray portion and the second side spray portion is annular and has the same size. The method according to claim 1,
Wherein the plurality of second nozzle tabs and the plurality of third nozzle tabs are arranged in a shifted manner in an alternating arrangement manner. &Lt; RTI ID = 0.0 &gt; 31. &lt; / RTI &gt; The method according to claim 1,
Wherein each of the plurality of second nozzle tabs is engaged with a plurality of tapped holes formed in a side surface of the first side jet portion,
Wherein each of the plurality of third nozzle tabs is coupled with a plurality of tapped holes formed on a side surface of the second side jetting portion. 5. The method of claim 4,
A plurality of second nozzle tabs and a plurality of third nozzle tabs each having a hole at a center of the front surface thereof for injecting a fluid flowing through each corresponding tapped hole and a pupil shaped groove surrounding the hole,
Wherein the pupil-shaped groove is cut obliquely about the hole. &Lt; RTI ID = 0.0 &gt; 18. &lt; / RTI &gt; 6. The method of claim 5,
Wherein the plurality of second nozzle tabs and the pupil-shaped grooves formed in the third nozzle tab are sloped in a range of 5 to 20 degrees with the nozzle maintained in a horizontal state. Boom water spray nozzle arrangement.

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