KR20120051909A - Apparatus for preventing reservoir of oil from the thunderbolt - Google Patents

Abstract

PURPOSE: A thunder prevention apparatus for a petroleum storage tank having improved corrosion resistance is provided to prevent a cut cable from being rolled to a drum unit for easily reusing the cable. CONSTITUTION: A thunder prevention apparatus for a petroleum storage tank comprises the following: a contact terminal installed on a floating loop floating inside the petroleum storage tank for storing petroleum; a drum unit located on the upper edge of a tank shell of the petroleum storage tank for winding and unwinding a cable(W); and a fixing member(26) located on the drum unit to the opposite direction for unwinding the cable for fixing the cable when the cable is cut. One end of the cable is flexibly winded to the drum unit, and the other end of the cable is connected to the contact terminal for flowing the electric charge.

Description

Lightning prevention device of oil storage tank {APPARATUS FOR PREVENTING RESERVOIR OF OIL FROM THE THUNDERBOLT}

The present invention relates to a lightning protection device for an oil storage tank, and more particularly, when the flexible cable connecting the floating loop and the tank shell is cut, it is easy to reuse by preventing the cable from being completely wound on the drum. The present invention relates to a lightning protection device for an oil storage tank having improved cable strength and corrosion resistance.

In general, crude oil, heavy oil, kerosene, etc. (hereinafter referred to as petroleum) are stored in a storage tank of a certain volume. Such petroleum is highly flammable and is likely to ignite by external factors such as flammables, external voltage or lightning.

Therefore, fire storage or lightning protection system is a very important factor in oil storage tanks.

In particular, since oil storage tanks are installed in a wide open area, there is a high risk of fire accidents caused by lightning strikes.

According to a fire investigation of an oil storage tank caused by a lightning strike, 15 to 20 oil storage tank fires occurred worldwide every year between 1951 and 2003, of which 31% were caused by lightning.

As such, when a fire occurs in an oil storage tank due to a lightning strike, the generation process is various, but a fire usually occurs by the following process.

That is, the petroleum storage tank is composed of a storage tank in which the petroleum is stored by having a predetermined volume, and a floating roof disposed in the storage tank so as to float and seal the petroleum.

When a lightning strikes the floating loop, a fire is caused by an arc called rim fiber between the wall of the storage tank and the floating loop. Such arcs can generally be 1,000 times stronger than direct lightning strikes.

Therefore, in order to prevent such an arc, there is a need for a lightning protection device for connecting and grounding the floating loop and the storage tank by a conductor.

Such a lightning protection device is typically disposed in the foam dam of the floating loop (Bracket) to which the charge of the floating loop is applied; A drum portion disposed at an upper edge of a tank shell and having a cable wound by an elastic force of a leaf spring; It includes a conductive cable connected to the drum and the form dam through which electric charge flows.

Therefore, when a lightning strikes the floating loop, an overcharge generated temporarily between the floating loop and the tank shell is discharged to the ground through the conductive cable to be controlled below a threshold that prevents combustion of the flammable mixture in the air, thereby preventing fire. Can be.

However, the lightning protection device for connecting the floating roof and the tank wall using such a flexible cable has the following problems.

First, the floating loop is lowered according to the supply and discharge of petroleum. At this time, the cable connecting the fixed tank shell and the descending floating loop can be cut down due to weakened durability by excessive tension and repeated operation. There is a problem.

Second, when the cable is cut, the cut cable is completely wound on a cable drum that is elastically supported by the leaf spring. In this case, after disassembling the cable drum device, the cable drum device is pulled out again to pull out the cable inserted into the case. Since the cable must be pulled out, it takes a lot of time to repair it.

Third, when the cable is rewound inside the case, there is a problem in that the elastic spring of the cable is maintained by rewinding the leaf spring having a strong elastic force to the rotation axis of the case.

Fourth, when using the cable for a long time, there is a problem that the rust generated in the tank is conducted to the cable and the cable can be cut.

Accordingly, the present invention has been made in view of the above problems, the object of the present invention is to prevent the coiling of the drum even when the cable is cut to provide a lightning protection device of the oil storage tank easy to use the cable again. It is.

Another object of the present invention is to improve the cable structure of the copper material, to strengthen the insufficient tensile strength of copper by applying copper inside, stainless steel outside, rust powder generated in the tank is conducted to the cable rust (Corrosion) To prevent the cable from being cut off and increase the rewinding strength of the cable, thereby providing a lightning protection device for an oil storage tank that can keep the cable taut under high tension at all times. It is.

Therefore, in order to achieve the above object, the present invention provides a connection terminal provided in a floating loop floating inside the oil storage tank in which oil is stored;

A drum unit disposed at an upper edge of the tank shell of the petroleum storage tank, in which a cable is wound or unwound;

A fixing member provided in the drum unit, the fixing member being disposed in an opposite direction to release the cable to fix the cable when the cable is cut and wound; And

One end is elastically wound on the drum, and the other end is connected to a connection terminal of the floating loop to provide a lightning protection device including a cable through which charge flows.

As described above, the lightning protection device according to the embodiment of the present invention has the following advantages.

First, by placing the fixing pins in the reverse direction of the cable unwinding direction on the drum to which the cable is wound, if the cable is cut and rapidly wound on the drum, the fixing pin is inserted into the surface of the cable to prevent the cable from being wound on the drum can do.

Second, by placing a stainless steel shell on the surface of the cable made of copper to have a double structure, while maintaining electrical conductivity due to copper, while strengthening the insufficient tensile strength of copper, and also rust powder generated in the tank Is prevented from being corroded to the cable to increase corrosion resistance, thereby preventing the cable from being cut and increasing the rewinding strength of the cable, so that the cable is always taut under high tension. You can keep it.

1 is a perspective view showing a petroleum storage tank equipped with a lightning protection device according to an embodiment of the present invention.
2 is a side view showing the structure of the lightning protection device shown in FIG.
3 is a bottom view of the cable drum unit shown in FIG. 2.
FIG. 4 is a state diagram illustrating a state in which the lightning protection device shown in FIG. 1 operates to insert a fixing pin into a cable.
5 is a perspective view schematically showing the structure of the cable shown in FIG.

Hereinafter, a lightning protection device for an oil storage tank according to an embodiment of the present invention will be described in detail.

1 is a perspective view showing a petroleum storage tank equipped with a lightning protection device according to an embodiment of the present invention, Figure 2 is a side view showing the structure of the lightning protection device shown in Figure 1, Figure 3 is shown in Figure 2 The bottom view of a cable drum part.

As shown, the lightning protection device 1 proposed by the present invention prevents the secondary arc due to lightning by connecting the tank shell 3 and the floating loop 5 of the oil storage tank with each other by the cable (W). Done.

At this time, the floating loop (5) has a structure of lifting up and down in accordance with the water level of the oil (7) stored in the tank shell (3).

The lightning protection device 1 includes a connection terminal 14 disposed at a foam dam 13 of the floating loop 5 to which electric charges due to lightning strikes are applied; A drum portion 11 disposed at an upper edge of the tank shell 3 to which the cable W is wound or unwound; A ground plate 20 for grounding the drum unit 11 to the ground; A cable (W), one end of which is elastically wound around the drum unit (11), and the other end of which is connected to the connection terminal (14), through which charge flows; It is connected to the drum portion 11 and includes a fixing member 26 for fixing the cable (W) when the cable (W) is cut and wound.

In the lightning protection device having such a structure, the connection terminal 14 is connected to the form dam 13 disposed on the upper surface of the floating loop 5. That is, the lower portion of the connection terminal 14 is fixed to the upper surface of the form dam 13 by a method such as bolting or welding.

At this time, a conductive cream is coated on the upper surface of the floating loop 5 to which the lower portion of the connection terminal Bracket 14 is fixed. Therefore, the charges conducted to the floating loop 5 can flow more efficiently through the connection terminal Bracket 14.

A fastening hole h is formed in the connection terminal 14, and the bolt B is fastened to the fastening hole h. Therefore, the other end of the cable (W) can be fixed to the fastening hole (h) of the connection terminal 14 by the bolt (B).

Although the connection terminal 14 has been described as being connected to the form dam 13, the present invention is not limited thereto, and the connection terminal 14 may be connected to another location of the floating loop 5.

The drum part 11 is disposed at the upper edge of the tank shell 3 and the cable W connected to the connection terminal 14 is elastically wound or unwound.

The drum 11 includes a fixing bracket 15 fixed to the upper edge of the tank shell 3; A pair of frames 17 protruding from the fixing bracket 15; A drum (21) rotatably provided between the pair of frames (17) and on which the cable (W) is wound; It is wound inside the drum 21 includes an elastic member 22 for rotating the drum 21 in the opposite direction in which the cable (W) is released by the elastic force.

In the drum unit having such a structure, the fixing bracket 15 is a horizontal portion 16 fixed to the upper surface of the edge of the tank shell 3, and bent downward from one end of the horizontal portion 16 tank shell And a vertical portion 18 supported inside (3). Thus, the drum portion 11 may be fixed to the edge of the tank shell (3).

In this case, the ground plate 20 is disposed between the horizontal portion 16 of the fixing bracket 15 and the upper surface of the tank shell 3.

Thus, electric charges applied through the cable W can flow to the ground through the fixing bracket 15, the ground plate 20, and the tank shell 3.

In the above, the ground plate 20 is provided separately to perform a grounding function, but the present invention is not limited thereto, and the ground plate 20 is not provided separately, and the horizontal portion 16 or the vertical portion of the fixing bracket 15 is provided. The unit 18 may directly contact the tank shell 3 to perform a grounding function.

The drum 21 has a cylindrical shape and is rotatably disposed by the rotation shaft 19 between the pair of frames 17. The cable W is wound around the outer circumferential surface of the drum 21.

Therefore, when the one end of the cable W is grasped and pulled, the cable W is released from the drum 21 by rotating in the clockwise direction 91 while the drum 21 is supported by the rotation shaft 19.

At this time, the drum 21 is in a state in which the repulsive force acts in the reverse direction 92 in which the cable W is released by the elastic force of the elastic member 22. That is, the elastic member 22 has a structure for supporting the drum 21 by a conventional main winding method.

Therefore, when the cable W released from the drum 21 is cut, the cable W can be quickly wound on the drum 21 by the elastic force of the elastic member 22.

In more detail, the elastic member 22 preferably means a leaf spring 31 having an elastic force. In addition, one side 31a of the leaf spring 31 is connected to the inner surface of the drum 21, and the other side 31b is wound around the rotating shaft 19 provided in the drum 21.

At this time, the leaf spring 31 is wound along the concentric trajectory in the clockwise direction 91, that is, the direction in which the cable (W) is released around the rotation axis (19).

Therefore, when the cable W wound around the drum 21 is pulled by the external force and released from the drum 21, the drum 21 rotates along the clockwise direction 91, and the elastic member 22 ) Is also wound in the clockwise direction 91, the diameter is contracted to generate an elastic force.

As a result, the repulsive force acts in the direction (counterclockwise direction) in which the leaf spring 31 is to be unfolded, so that the drum 21 rotates in the counterclockwise direction 92.

In this state, when the cable W is cut, the drum 21 is rotated in the counterclockwise direction 92 by the elastic force of the elastic member 22, the cable W of the drum 21 It is wound rapidly on the outer circumference.

In this case, the cable W may be completely wound on the outer circumferential surface of the drum 21 by the fixing member 26.

That is, when the cable W is completely wound on the drum 21, the leaf spring 31 inside the drum 21 is also completely loosened, so the drum 21 is disassembled and the leaf spring ( 31) must be rewinded clockwise (91).

Thus, the fixing member 26 is provided in order to prevent such a complicated operation to prevent the cable from being completely wound on the drum 21.

As shown in FIGS. 3 and 4, the fixing member 26 includes a pair of fixing frames 23 disposed at a predetermined distance from the circumferential surface of the drum 21; A support 25 disposed between the pair of fixed frames 23; It is fixed to the support 25, the cable (W) includes a fixing pin (27) which is aligned in the reverse direction (92) to be released is inserted into the cable (W) to secure the cable (W).

The pair of fixing frames 23 has a structure in which one side is connected to the vertical portion 18 of the fixing bracket 15, and the other side surrounds the circumferential surface of the drum 21 and proceeds along a curve.

In addition, the fixing pin 27 is provided on the support 25 disposed between the pair of fixing frames 23.

At this time, the fixing pin 27 is one side is connected to the support 25, the other side is protruded in the reverse direction 92 is released cable (W) from the support 25 has a wedge shape.

Therefore, when the cable W is cut and wound on the drum 21, the surface of the cable W is caught by the wedge end e of the fixing pin 27, and the wedge end e is It is inserted into the surface of the cable (W).

As a result, the cable W can be prevented from being further wound on the drum 21 by being caught by the fixing pin 27 in the state of being wound on the drum 21.

In addition, the fixing pin 27 is disposed at a predetermined distance in the radial direction from the outer peripheral surface of the drum. That is, when the cable W is normally unwound or unwound in the drum 21 without being cut, it is necessary to prevent the surface of the cable W from being caught by the fixing pin 27.

That is, when the cable W is cut off and rapidly wound on the drum 21, the end of the cut cable W swings along an irregular trajectory, so that the end of the cable W may be caught. It is preferable that the fixing pin 27 is disposed.

As a result, it is preferable that the fixing pin 27 is disposed further radially outward than the virtual circular locus formed when the cable W is wound up to the drum 21 at maximum.

At this time, the end (e) of the fixing pin 27 has been described in a wedge shape, but the present invention is not limited thereto, and any shape can be inserted into the surface of the cable (W).

Meanwhile, the cable W has a structure in which durability and strength are improved by adding a stainless material to the outside as shown in FIG. 5.

That is, the cable (W), the inner core material and the inner core material 35 having a conductive structure; It is disposed on the outside of the core material 35 to increase the strength and includes an outer jacket material 33 of the network structure.

The core 35 is a conductive material, preferably copper, and electric charges stored in the floating loop 5 can be easily applied to the cable drum 11 through the core 35.

In addition, the outer cover material 33 is a steel material having a certain strength, preferably stainless steel (Stainless Steel). Therefore, the sheath material 33 may prevent the cable W from being cut by increasing the strength by reinforcing the weak tensile strength of the copper core material 35.

In addition, the outer shell material 33 is made of stainless steel to increase corrosion resistance, thereby preventing the rust generated from the tank from being conducted to the cable W, thereby preventing the cable W from being easily cut.

In addition, the outer cover material 33 has a network structure, ie, a structure in which a thin wire is woven by crossing in a string and a helical manner. Thus, such envelope 33 may have greater strength.

In addition, since the envelope 33 is a network structure, the fixing pin 27 may be more efficiently inserted into the surface of the envelope 33.

Therefore, when the cable W is cut, the fixing pin 27 is rapidly inserted into the outer shell material 33 of the network structure, thereby preventing the cable W from being wound over the drum 21 by a predetermined length or more. have.

As a result, the cable according to the present invention can satisfy all of the electrical conductivity, strength, and corrosion resistance by being composed of a conductive core material 35 having a conductive material and a sheathless material 33.

Hereinafter, with reference to the accompanying drawings will be described in more detail the operation of the lightning protection device of the oil storage tank according to an embodiment of the present invention.

1 to 5, when the lightning protection device 1 is installed in an oil storage tank, first, the cable W is pulled out from the drum part 11.

Then, the tip of the drawn cable W is connected to the connection terminal 14 of the fluting loop 5 in a bolting manner.

At this time, the drum (21) wound around the cable (W) is a state in which the elastic force is acting by shrinking the diameter by winding the leaf spring 31 provided therein in the clockwise direction (91).

That is, the drum 21 is in a state in which a constant tension is applied to the cable W because the drum 21 is subjected to the repulsive force in the counterclockwise direction 92.

In this state, when the floating loop 5 rises, the cable W is wound around the drum 21 by winding the drum 21 counterclockwise 92.

On the contrary, when the floating loop 5 descends, the drum 21 is rotated clockwise 91 by pulling the cable W downward, and the repulsive force is counterclockwise by the leaf spring 31. Will work.

In this state, when the cable W is cut, the drum 21 is rotated in the counterclockwise direction 92 by the elastic force of the elastic member 22, the cable W of the drum 21 It is wound rapidly on the outer circumference.

At this time, the fixing pin 27 of the fixing member 26 is disposed in a direction opposite to the direction in which the cable (W) is released.

Therefore, when the cable W is cut and wound on the drum 21, the surface of the cable W is caught by the wedge end e of the fixing pin 27, and the wedge end e is It is inserted into the surface of the cable (W).

As a result, the cable W can be prevented from being caught by the fixing pins and further wound on the drum.

In this state, the cut cable W is repaired and connected to the form dam 13 of the fluting loop 5 again.

Then, by removing the fixing pin 27 inserted into the surface of the cable (W), the cable (W) can be wound on the drum 21 in a state where a constant tension is applied again.

Even when the cable W is cut through this process, the cable W may be completely wound on the drum 21, thereby eliminating the need to rewind the leaf spring 31.

In addition, the cable (W) has a structure in which the outer shell material 33 made of stainless steel is disposed outside the conductive core material 35 having conductivity.

Therefore, such a cable W can be prevented from being easily cut by being conductive by the core material 35 and at the same time having appropriate rigidity by the sheath material 33.

1: lightning protection device 3: tank shell
5: floating loop 7: petroleum
11: drum 13: foam dam
22: elastic member 26: fixed member

Claims (5)

A connection terminal provided in a floating loop capable of lifting and lowering by floating in an oil storage tank in which oil is stored;
A drum unit disposed at an upper edge of the tank shell of the petroleum storage tank, in which a cable is wound or unwound;
A fixing member provided in the drum unit, the fixing member being disposed in an opposite direction to release the cable to fix the cable when the cable is cut and wound; And
One end is elastically wound on the drum, the other end is connected to the connection terminal of the floating loop comprising a cable through which charge flows. The method of claim 1,
The drum unit and a fixing bracket fixed to an upper edge of the tank shell; A pair of frames protruding from the fixing bracket; A drum rotatably provided between the pair of frames, the cable being wound; And an elastic member wound inside the drum and rotating the drum in an opposite direction in which the cable is unwound by an elastic force. The method of claim 2,
The fixing member comprises a pair of fixing frames spaced apart from the circumferential surface of the drum and disposed along the circumferential surface; Lightning prevention device including a fixing pin for fixing the cable is arranged in the reverse direction in which the cable is released to the pair of fixed frame. The method of claim 3, wherein
The fixing pin is a lightning protection device, characterized in that disposed more radially outward than the virtual circular trajectory formed when the cable is wound up to the drum. The method of claim 1,
The cable, the inner core and the inner core material of the copper structure having a conductive copper material; Lightning protection device disposed on the outside of the core material and made of stainless steel to increase the strength and including the outer shell material of the network structure.

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