JPS6341356Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a temporary rainwater intrusion prevention device for a floating roof type tank used for carrying out internal work on a floating roof type tank used for storing crude oil, etc.

[Prior art]

When inspecting and servicing the inside of a floating roof tank used for storing crude oil, etc., after draining as much of the stored liquid as possible inside, open the manhole and clean and remove any liquid or sludge remaining inside. Afterwards, an internal inspection and necessary repairs will be carried out. At this time, until the internal cleaning is completed, the remaining liquid and sludge generate mainly hydrocarbons and hydrogen sulfide gas, which are explosive and dangerous, and their toxicity can harm the health of the operator. . Furthermore, the smoke-like fine powder generated during welding repairs is also harmful to health.

This requires temporary construction of large-scale forced ventilation equipment and long ventilation times. Additionally, a large amount of cost is required for the temporary installation of lighting equipment necessary for inspection, repair, and other work.

In order to solve these problems, the annular sealing device installed between the side plate and the floating roof may be removed in advance and a sufficient opening is provided at the top.
In this case, the work must be stopped when it rains, and the tank must be drained even after the rain has stopped, and the presence of moisture may occur during welding work or flaw detection using magnetic particles or dyeing. Because it is harmful, it is necessary to thoroughly dry the work area, and there are disadvantages such as extending the work time due to the influence of rain and rainwater removal work resulting in tank stoppage losses and a significant increase in work costs.

[Purpose of invention]

The purpose of the present invention is to overcome the above-mentioned conventional drawbacks, and when working inside a floating roof tank, after removing the tank's sealing device, it is possible to cover the upper part of the part from which the sealing device has been removed, so that rainwater can drain away during rain. To provide a temporary rainwater intrusion prevention device for a floating roof type tank that can prevent intrusion and ensure sufficient opening area for ventilation and lighting.

[Structure of the idea]

That is, the present invention provides a temporary rainwater intrusion prevention device for a floating roof tank that has a tank side plate, an annular pontoon, and an annular form dam weir plate attached to the middle part of the upper surface of the pontoon, which is detachably attached to the form dam weir plate. a plurality of support girders installed at an inclination so that the side plate side is higher; and a plurality of support girders arranged on the support girders, the outer circumferential portion of which is removably attached to the inner surface of the side plate, and the inner circumferential end of which is inside the outer circumference of the pontoon. This temporary rainwater intrusion prevention device for a floating roof type tank is characterized by comprising an annular sheet made of a transparent water-resistant material formed outside the outer periphery of the form dam weir plate.

〔Example〕

Next, the present invention will be explained in more detail by way of an embodiment with reference to the drawings.

In FIG. 1, a ring-shaped pontoon 2 is provided inside a tank body 1 having a side plate 1a and a bottom plate 1b.
A floating plate roof 3 having a floating board roof 3 attached to the outer periphery is horizontally arranged, and a sealing device 4 is arranged between the outer periphery of the pontoon 2 and the inner surface of the side plate 1a. An annular form dam weir plate 5 is fixed to the middle part of the upper surface of the pontoon 2.

When inspecting and servicing the inside of the floating roof tank, the sealing device 4 is removed and a temporary rainwater intrusion prevention device 10 according to the present invention is installed to cover the removed portion.

FIG. 2 is a partially detailed perspective view for explaining the present invention, and in this figure, the rainwater intrusion prevention device 10
It generally has a support beam 11 made of metal or plastic pipe or the like and a water-resistant transparent sheet 12 made of vinyl or the like. The support girder 11 extends from the inner surface of the side plate 1a to the upper end of the form dam weir plate 5, and is detachably fixed to the form dam weir plate 5 by a clamp 13. The support girder 11 is arranged to be inclined so that the side plate 1a side is higher, and its length is longer than the distance between the side plate 1a and the form dam weir plate 5.
Further, the support girder 11 and the clamp 13 are configured to be adjustable according to the above-mentioned spacing. The support girders 11 are arranged at appropriate intervals over the entire circumference of the form dam weir plate 5. The sheet 12 is formed in an annular shape, and its outer peripheral portion is removably attached to the inner surface of the side plate 1a using an adhesive tape 14 or the like, and is placed on the support beam 11. The inner peripheral end 12a of the annular sheet 12 is located at a position spaced apart from the form dam weir plate 5, and the pontoon 2
It extends to cover the top surface at intervals. That is, the inner peripheral end of the sheet 12 is located inside the outer periphery of the pontoon 2 and outside the outer periphery of the form dam weir plate 5. The upper surface of the pontoon 2 is sloped downward toward the center of the tank, and a plurality of drainage holes 5 are provided at the connection part of the form dam weir plate 5 with the pontoon 2.
A is provided.

FIG. 3 is a detailed cross-sectional view of the attachment part of the seat 12 to the side plate 1a, in which the attachment part on the inner surface of the side plate 1a has been rust-removed in advance, then rust-preventive paint 15 is applied, and adhesive 16 is applied on top of this. The outer peripheral end portions of the sheets 12 are joined through the joints. The sheet 12 is fixed to the side plate 1a via paint 15 using adhesive tape 14 from the upper and lower parts of the sheet 12.

As shown in FIG. 4, when inspecting and servicing the inside of the tank, after removing the sealing device 4, the temporary rainwater intrusion prevention device 10 of the present invention is installed. When it rains, the rain falls onto the sheet 12, and since the sheet 12 is sloped, the rainwater falls onto the top surface of the pontoon 2, and since the pontoon 2 is also sloped, the rainwater falls onto the form dam weir plate 5.
The water flows to the side, passes through the drain hole 5a, flows onto the floating roof 3, and is discharged to the outside through a drain pipe (not shown) installed there.

The sheet 12 is installed so as to cover the pontoons 2 at a distance, so that rainwater that flows over the sheet 12 falls onto the top surface of the pontoons 2 and does not enter the tank. The sheet 12 is transparent so that light can be introduced from the outside, and since it is installed at a distance from the foam dam 5, there is sufficient room for air to exchange between the inside of the tank and the outside air.

Next, a practical example of the present invention will be shown.

Target tank 150.000Kl crude oil storage tank Tank inner diameter 100.1M Distance between inner surface of side plate and outer periphery of pontoon (opening width after removing seal device) 260 m/m Distance between inner surface of side plate and form dam 1200 m/m Form dam height 900 m/m Seat of side plate Approximately 250 to 300m/m around the adhesive area
After applying rust removal with a cloth, apply anti-rust paint. A 19φ x 1.2t x 1.500 galvanized steel pipe is used as the girder material. They were arranged around the entire circumference of the tank at a pitch of 1.500 m/m with a slope of 10° towards the center of the tank, and were fixed to the upper end of the form dam weir plate using pipe fixing clamps. A soft transparent vinyl sheet 0.14t x 1.350 width with reinforcing fiber was used as the sheet.
Approximately 50 m/m wide on one side of the sheet was adhered to the side plate, and 100 m/m wide cloth gummed tape was used above and below the adhesive part to reinforce the adhesion. In this case, the distance between the inner peripheral edge of the sheet and the form dam, that is, the opening width is approximately
It became 300m/m.

As a result, although it rained seven times during the 180-day period during which work was being carried out inside the tank, there was no interruption in work, and there was no need to temporarily install forced ventilation equipment. Assuming that this work was performed without removing the sealing device and temporarily installing this device, it would be 1
Due to rainwater drainage work, etc., an average of 3.
It is estimated that the work period was extended by at least 21 days, as it required a one-day suspension of work.

[Effect of idea]

The use of the device of the present invention has the following effects.

(b) Rainwater will no longer infiltrate inside the tank, eliminating work delays and rainwater drainage costs.

(b) The structure is open, providing good ventilation and improving the working environment, and does not require temporary installation of forced ventilation equipment.

(c) Since the sheet 6 is transparent,
It provides good lighting and reduces the number of temporary lights required for internal work.

(d) It can be used many times and the temporary installation cost is low.

(e) It will not be damaged even by long periods of wind and rain.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a floating roof tank equipped with the present invention, Fig. 2 is a partially detailed perspective view of an embodiment of the present invention, and Fig. 3 is a sectional view of an embodiment of the seat attachment part of the present invention. , FIG. 4 is a sectional view for explaining the operation of the present invention. 1...Tank body, 1a...Side plate, 1b...Bottom plate, 2...Pontoon, 3...Floating plate roof, 4...
Sealing device, 5... Form dam weir plate, 10...
Rainwater intrusion prevention device, 11...Support girder, 12...Sheet, 13...Clamp, 14...Adhesive tape.

Claims (1)

[Scope of utility model registration request] In a temporary rainwater intrusion prevention device for a floating roof type tank having a tank side plate, an annular pontoon, and an annular form dam weir plate attached to the middle part of the upper surface of the pontoon, the side plate is detachable from the form dam weir plate and the side plate side is raised. a plurality of support girders installed at an angle to the pontoon; and a plurality of support girders arranged on the support girders, the outer circumferential portion of which is removably attached to the inner surface of the side plate, and the inner circumferential end of which is inside the outer circumference of the pontoon and further than the outer circumference of the form dam weir plate. A temporary rainwater intrusion prevention device for a floating roof type tank, characterized by comprising an annular sheet made of a transparent water-resistant material formed on the outside.