JPS5826952Y2 - Storage tank floating roof earth - Google Patents

Description

[Detailed description of the invention] Conventionally, when a floating roof is provided for a storage tank for flammable liquids, etc., a ground wire is sometimes provided for the purpose of grounding the storage tank body for the purpose of preventing lightning strikes and static electricity.

This ground wire is generally suspended from the top of the storage tank and has one end fixed to the floating roof.

When the floating roof moves up and down, the ground wire may get caught between the floating roof and the side wall, and when the floating roof descends, the ground wire spread over the floating roof may wrap around attached equipment and be cut off. It had the following drawbacks.

The purpose of this application is to provide a grounding facility that is designed to prevent such accidents.

To briefly explain the conventional equipment, Fig. 1 shows the grounding equipment that is most often used, and it is the grounding equipment that is used in the storage tank side wall A and the floating roof 8.
In between, an inner ladder C that rotates as the floating roof B moves up and down is used to minimize the hanging length of the ground wire.

Figure 2 shows a method generally used when there is no internal ladder, in which a ground wire with a length longer than the entire length of the floating roof B is suspended from the top of the tank.

In this case, the storage tank E with the fixed foot is installed at a sufficient distance inward from the side wall, and the above-mentioned entrainment phenomenon can be prevented.

However, there is a possibility that it may get wrapped around attached equipment.

The case shown in Figure 3 is a method used for liquids with few deposits or precipitates, and the sliding plate F connected to the floating roof B in the liquid.
This equipment connects to the ground by pressing it against the side wall A.

In this case, the condition is that the liquid does not contain insulating precipitates.

Figures 4 and 5 are in the present application, and are suitable for liquids containing insulating precipitates that do not have an internal ladder, or even if there is, the hanging length will be very long. The details will be explained with reference to FIG. Attach one end of the ground wire 3 with the fixing part 4, and attach it to the floating roof 5.
The sealing member 7 of the hole 6 provided in the hole 6 and the ground wire 3 suspended through the hole 6 of the floating roof 5 are connected to the floating roof 5 via the liquid.
It passes through a hole 8 provided in the floating roof 5 and rises, and is verified with a fixed part 9 of the floating roof 5.

Furthermore, if we describe the relationship between the holes 6, 8, etc. in detail, the floating roof 5
A hole 6 is bored in the hole 6, and a cylinder 12 is fixed upwardly in the hole 6.
A sealing member 7 is provided on the upper part of the cylinder 12, a hole 8 is separately made in the floating roof 5, a cylinder 13 is fixed upwardly in the hole 8, and a hole (L14 is bored in the center of the upper end of the cylinder 13). Lid plate 1
5 is detachably attached, and a fixing part 9 of the ground wire 3 is further fixed to the floating roof 5 around the cylinder 13.

A hole 16 is provided in the center of the cylinders 12 and 13, a cylinder 17 is fixed upwardly in the hole 16, and a lid body 19 with a hole 18 in the center is attached to the upper end of the cylinder 17. An operating rod 21 having a handle 20 at its upper end is inserted downward.

The operating rod 21 descends vertically from the handle 20 and bends horizontally at a certain distance to form a horizontal rod 21 a, and the horizontal rod 21 a is located between the axis C of the operating rod 21 and the center line C of the holes 6 and 8.
' length, and is bent upward at a right angle at the end of the horizontal rod 21a to form a rising rod 21b, and a clamping fitting 22 for the ground wire 3 is provided at the upper end of the rising rod 21a. .

The length of the ascending rod 21b is determined by the length of the operating rod 21 and the handle 2.
When holding the cylinder 1 and pulling it upward, the clamping fittings 22 are attached to the cylinder 1.
The length should completely protrude from 2 and 13.

The operating rod 21 is appropriately designed so that the handle 20 can hold the clamping fitting 22 at a position perpendicular to the cylinder 12 side, the cylinder 13 side, and the front.

In the present application, the accumulated current flows through the floating roof 5, the ground 3, the side plate 2, and the ground 23 due to the above structure.

Also, when replacing the ground wire 3 when using the storage tank 1, first attach the new ground wire to the fixed part 4, and then attach the handle 2.
0, the operating rod 21 is raised, the clamping metal fitting 22 protrudes from the sealing member 7 of the cylinder 12, the free end of the ground wire 3 is attached to the clamping metal fitting 22, the operating rod 21 is lowered, and the grounding wire 3 is submerged in the liquid. Rotate the operating rod 21 by 180 degrees while placing the cylinder 13 in the
Remove the cover plate 15 of No. 3, pull up the handle 20 again, make the clamping metal fitting 22 at the tip of the operating rod 21 protrude from the cylinder 13, and remove the free end of the ground wire 3 attached to the clamping metal fitting 22 from the clamping metal fitting 22. It is inserted through the hole 14 of the lid 15 and fixed to the fixing member 9.

The lid plate 15 is fixed to the cylinder 13.

The old ground wire should be removed as appropriate in parallel with the replacement.

The ground wire 3 hangs down under the floating roof 5 due to its own weight.

The operating rod 21 is normally held in a direction in which the horizontal rod 21b intersects the line connecting the cylinders 12 and 13 at right angles.

The present application also fixes the lower end of the newly installed ground wire 3 to the upper end of the existing earth wire 3 at the time of replacement, and after fixing the upper end of the newly installed earth wire 3 to the upper fixing member 4, the cover plate of the cylinder 13 is fixed. 15 and pull out the existing ground wire 3, and when the new ground wire 3 is pulled out, remove the existing ground wire 3, insert the new ground wire 3 through the hole 14 and fix it to the fixing member 9, The replacement is completed by fixing the cover plate 15 to the cylinder 13.

In the present application, a supporting member is provided on the upper part of the side wall 2 of the storage tank 1 as in Naruko, or one end of the ground wire 3 is connected to the fixed roof with a fixed part 4.
The sealing member 7 of the hole 6 provided in the floating roof 5 and the ground wire 3 suspended through the hole 6 of the floating roof 5 are passed through the liquid and passed through the hole 8 provided in the floating roof 5. Since it is fixed by the fixing part 9 of the floating roof 5, there is no need to stop using the ground wire at all when replacing the ground wire, and the ground wire does not get caught on the pillars of the floating roof or is pressed too tightly. Moreover, since the ground wire extending from the upper part of the floating roof is almost in a straight line, there is no risk of it getting caught on the upper equipment.

[Brief explanation of the drawing]

1 to 3 are partial cross-sectional views of conventional storage tanks, FIG. 4 is a partial cross-sectional view for explaining the outline of the present application, and Figure 5 A-9 is a partial cross-sectional view of the embodiment of the present application. , FIG. 6 is an enlarged sectional view of the main part. 1...Storage tank, 2...Side wall, 3...
・・Ground wire, 4・・Fixed parts, 5・・・・
・Floating roof, 6...hole, 7...sealing member, 8...hole, 9...fixing part.

Claims (1)

[Scope of utility model registration request] A support member is provided on the upper part of the side wall 2 of the storage tank 1, or one end of the ground wire 3 is attached to the fixed roof using the fixed part 4, and the sealing member 7 of the hole 6 provided in the floating roof 5 is connected to the hole 6 of the floating roof 5. The earthing tank floating roof is grounded by passing through and suspending a grounding wire 3 through the liquid, passing through a hole 8 provided in a floating roof 5, rising, and fixing it with a fixing part 9 of the floating roof 5.