JPS6254711B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drainage device for rainwater collected on the roof of a floating roof type oil tank. As is well known, the floating roof type oil tank has a system in which a floating roof 2 is placed above the internal oil level of the oil tank 1 to prevent evaporation loss of the stored oil and prevent rainwater from entering, as shown in Figure 1. A drain pipe 3 whose upper end is fixed to the floating roof 2 in order to remove rainwater accumulated on the roof, and which can be bent in response to the rise and fall of the roof.
It is equipped with

Conventional roof drainage systems include those that combine steel pipes and universal joints to form a series of drainage systems that can be folded in a vertical plane (Figure 1), or those that connect a single long drainage hose to the bottom of a floating roof. It is known that the installed rainwater collection basin is connected to a drain nozzle at the bottom of the side panel of the oil tank, and the rainwater is discharged to the outside of the tank.

However, universal joints generally have a seal seal built into the freely rotating part, and although this prevents stored oil from entering the joint, the seal deteriorates over time, making it easy for stored oil to leak. It has defects.

In addition, this is to compensate for the strength of the joints against twisting of the pipes when the floating roof moves up and down and swings, and to provide space for the folded drain pipes to be stored without touching each other when the floating roof reaches its lowest position. Therefore, the joints had to be assembled in a box-like structure as shown in Figure 2, and a total of eight expensive universal joints had to be used on both sides of each bend, which increased the purchase cost of the joints. Currently, this accounts for a large proportion of the drain pipe manufacturing cost.

On the other hand, as an example of not using a universal joint, there are conventional ones that use a long hose, but in this case,
There were defects such as hoses becoming twisted as the floating roof was raised and lowered, and becoming entangled with structures protruding from the underside of the floating roof, resulting in damage.

In view of the above, major challenges have been to reduce the number of universal joints that cause leakage and reduce purchasing costs, and to realize a drainage device that does not use a long hose.

The present invention is an improvement over the conventional structure in which a long drain pipe is folded only in a vertical plane. In other words, the end of the drain pipe raised diagonally from the bottom of the tank wall is suspended from a trolley that slides in a straight line just below the floating roof, and the drain pipe connects the bottom of the tank wall and the bottom of the floating roof in a straight line (hereinafter referred to as swing pipe). A drain pipe or hose whose both ends are connected to the upper end of the swing pipe that moves horizontally in response to the rise and fall of the floating roof and the drain of the rainwater collection box, and which moves while bending on a fixed horizontal plane. The system employs a series of drainage pipes formed from According to this structure, the swing pipe is the only long drain pipe element, and its load is supported by a strong pulley at its upper end, while the other drain pipes are relatively short, and the load on each joint is also reduced. There is no need to assemble each joint part in a box shape as in the conventional method, and since the drain pipe structure has only one route, the number of joints is halved, and a drainage device using fewer universal joints is provided.

Next, an embodiment of the present invention will be described with reference to FIGS. 3, 4, and 5. A drainage nozzle 10a protruding from the bottom of a rainwater collection box 4 provided in the central recess of the floating roof 2, The primary side of the drain pipe 10b having universal joints 12 and 13 at both ends in the drainage direction is connected, and the drain pipe 10c having a universal joint 14 on the secondary side is further connected to the drain pipe 10c with a water flow gradient at the bent part of each universal joint. while sequentially connecting to the secondary side of the drain pipe 10b.

On the other hand, the swing pipe 10e raised from the discharge nozzle 10f via the universal joint 16 is suspended at its upper end from a trolley 8 that reciprocates in a straight line directly below the floating roof 2 in parallel with the floating roof board, and drains water. tube 1
It is connected to the secondary sides of 0c and 10d via universal joints 14 and 15.

Universal joints 12, 13, with rotation surfaces in the horizontal direction
The drain pipes 10b and 10c having 14 at both ends move while bending and expanding on a constant horizontal plane in response to the rise and fall of the floating roof 2. Similarly, the swing pipe 10e uses the universal joint 16 as a fulcrum and moves up and down in a vertical plane.

Here, a universal joint 1 having a rotating surface in the vertical direction
5 absorbs the twist between the drain pipes 10d and 10e.

That is, the rainwater drainage device according to the present invention is composed of a part that operates on a horizontal plane and a part that moves in a vertical plane with the upper end of the swing pipe as a boundary.

Here, the 13 parts of the universal joint floating on the horizontal plane are as follows:
Because it receives bending load from the drain pipes before and after it,
As a load support member, a guide rail 11 suspended from the floating roof is provided on the lower horizontal surface of the floating range.

The sliding plate 7 or the wheel integrally protruding downward from the member of the joint 13 moves on the guide rail 11 while receiving the load. Moreover, two running rails 9 having a length longer than the running range of the trolley corresponding to the lifting and lowering of the floating roof are installed on a horizontal plane directly below the floating roof, and a plurality of wheels are mounted on the rails. A trolley 8 with the upper end of the swing pipe suspended thereon is mounted and moves reciprocally.

Further, since the angle between the central axis of the swing pipe and the horizontal plane changes as the floating roof rises and falls, the carriage and the upper end of the swing pipe are connected via pins 25.

According to the present invention, the number of universal joints used in one series of drainage devices is 4 in the horizontal movement section.
2, 13, 14, 15, and one piece 16 for the vertical motion part, making a total of 5 pieces, which is a decrease of 3 pieces compared to the conventional system (Fig. 2), resulting in a significant reduction in manufacturing costs.

In addition, conventional drainage equipment has only two fixed support points, one on the collection side and one on the discharge nozzle side, and there is no fixed support fitting to prevent the drainage pipe from swinging in the middle, making it unstable. According to the law, the longest drainage pipe (swing pipe) will be supported by a trolley under the floating roof, which has the advantage of not putting undue load on each joint.

Next, an embodiment that does not use a universal joint will be described with reference to FIG.

This embodiment is characterized in that the horizontally moving part and the part where the swing pipe connects to the bottom drainage nozzle are formed of flexible hoses in the previous embodiment.

That is, a flexible hose 18 is connected to a drain pipe 17 protruding from the bottom of the collection box 4. On the secondary side of the hose 18, a swing pipe 19 whose lower end forms a hinge 20 installed near the drainage nozzle at the bottom of the oil tank, and whose upper end is suspended from a trolley 8 that reciprocates in a straight line directly below the floating roof 2. Connect the top end of the

Furthermore, at the lower end of the swing pipe 19,
In order to form a hinge 20 on the central axis, a drainage outlet 23 is separately provided as a drainage flow path on the front side of the lower end of the swing pipe, and is connected to a drainage nozzle 22 passing through the oil tank 1 via a hose 21. A series of drainage channels are formed to the outside of the tank.

Here, the hose 18, which absorbs the horizontal movement of the upper end of the swing pipe as the floating roof goes up and down, is supported by a support 24 within its movement range to prevent it from bending downward.

In order to prevent the hose 18 sliding on the support 24 from being worn out, wear-resistant material such as a body plate is spread around the hose 18 at intervals to reinforce the hose 18.

According to the present invention, since an expensive universal joint that is likely to cause leakage is not used, the risk of oil leakage accidents is reduced, and manufacturing costs are also reduced. In addition, the hoses 18 and 21 used are both short.
This occurs when using long objects as in the past.
Accidents of damage due to binding, twisting, or collision with floating roof accessories are also reduced.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a conventional floating roof type oil tank, Figure 2 is an explanatory expanded view of the drainage system in Figure 1, and Figure 3 is a cross-sectional view of a conventional floating roof type oil tank.
The figure is a sectional view showing an example of an embodiment of the present invention,
4 is a plan view taken along the line AA in FIG. 3, FIG. 5 is a side view taken along the line BB in FIG. 4, and FIG. 6 is a perspective view showing an embodiment of the present invention. be. 1...Oil tank, 2...Floating roof, 3a, 3b, 3
c, 3d, 3e...Drain pipe, 4...Rainwater collection, 5...Seal device, 6...Drain pipe, 7
...Sliding plate, 8...Dolly, 9...Traveling rail, 1
0a...Drainage nozzle, 10b, 10c, 10d...
...Drain pipe, 10e...Swing pipe, 10f...
...Bottom drain pipe, 11...Guide rail, 12,1
3, 14, 15, 16... Universal joint, 17... Drain pipe, 18... Hose, 19... Swing pipe, 20... Hinge, 21... Hose, 22...
Bottom drainage nozzle, 23... Drainage outlet, 24...
...Support, 25...pin.

Claims (1)

[Scope of Claims] 1. A truck having a swing pipe connecting the lower part of the floating roof to the lower part of the oil tank side plate as a fulcrum, with the upper end of the swing pipe provided directly below the floating roof plate. It has a structure in which this trolley moves in a straight line reciprocating directly under the floating roof in response to the rise and fall of the floating roof, and the end of the drain pipe and the upper end of the swing pipe that protrude from the collection are connected to a universal joint. A roof drainage device for a floating roof oil tank that is connected by a combination of pipes and has a structure that absorbs displacement on the horizontal plane of both ends of the pipes. 2. Claim 1, in which the connecting portion between the end of the drain pipe protruding from the collection box and the upper end of the swing pipe, and the connecting portion between the lower end of the swing pipe and the bottom drain nozzle 22 are formed of flexible hoses. A roof drainage device for a floating roof type oil tank described in .