FI67118B - ISOLERING FOER TAK PAO OLJECISTERNER - Google Patents

Description

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Insulation for the roof of oil tanks - isolering för tak head oil tank

The insulation of the invention is intended for use in the roofs of oil tanks and the like (gas tanks, etc.). There are a number of special problems with insulating the roofs of tanks. These ceilings are often large and relatively flat. In this case, good and durable insulation must be provided, which is not only heat-insulating but also protects against rust and the like. Insulation must also protect itself, in other words, its function must not deteriorate over time.

The containers may be relatively flat and may be provided with a circumference of a certain height. This causes water to cover the roof and insulation and can in certain cases - eg after heavy rain - form a puddle or a real pool, oil tanks occur naturally in environments where the air is unclean (oil refineries and industrial plants are often in the vicinity) which the water falling on the tanks is unclean. In addition, water may remain on the insulation for a longer period of time. This causes the insulation to be (presumably) under the influence of acidic water for long periods of time.

It is important to protect the roofs of the tanks from rust. Rust could lead to a hole in the ceiling and leave the oil or gas in the tank unprotected.

The weak points of the insulation are its fasteners, because they have to extend through the insulation and thus a hole has to be made in the insulation for the fastening members. These further form a metal connection between the tank and the top surface of the insulation, which can lead to rust advancing from the surface of the insulation down to the 2 67118 roof. Known fasteners are not designed to operate in the conditions described above. Examples of prior art are U.S. Pat. No. 3,595,728 and FR ~ 7,610,510, FR-1229,631, US-2,879,660 and DE-2,852,528.

Another known example of a tank insulation technique is that the insulating material is installed in place and then an aluminum sheet is installed on top of it for protection. The aluminum sheet is joined together by folding joints, usually by double folding joints. In this case, a strong connection is obtained, whereby the aluminum nipples cannot move relative to each other. However, it has been found that cracks form in the dampers due to thermal stresses. When the protective damper is leaking, the insulation material is exposed to moisture, dirt and the like. Moisture penetrates the insulation and reaches the roof itself. This will cause corrosion of the roof, even corroding the broken roof. Aluminum sheet metal is also quite expensive, which together with the relatively expensive and time-consuming folding joint method makes the entire insulation expensive.

The object of the present invention is to provide an insulation which is easy to install, inexpensive and which does not have a tendency to crack. The essential features of the invention will become apparent from the claims. The insulation according to the invention avoids the disadvantages caused by thermal stresses and provides excellent and inexpensive insulation which is easy to attach and remains completely tight.

According to the invention, the specially designed fasteners provide satisfactory protection and insulation of the roof in such extremely unfavorable conditions as the long-term presence of dirty and acidic water without the fasteners forming weak points. This has not been possible with the prior art.

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The invention will be explained in more detail below with reference to the accompanying drawings, in which:

Figure 1 shows a side view of a fastening member according to a first embodiment of the invention.

Figure 2 shows a side view of another embodiment of a fastening member according to the invention.

Figure 3 shows a side view of a part of the oil tank.

Figure 4 shows a top view of the same part.

Figure 5 shows a cross-section of the insulation of the transition point between the roof and the casing of the oil tank.

Figure 6 shows a schematic diagram of a welding gun for fastening screw pins.

Figure 7 shows a side view of a welded screw pin.

A screw pin 3 is attached to the roof 1 of the tank by means of a welding gun (Fig. 6), one end 4 of which is provided with threads and the other end 5 is made for welding with a welding gun. The end 5 has a small centering pin 6 (cf. Fig. 6) which places the weld pin 3 on the central axis. The pins 3 are placed at equal distances from each other by means of a fastening device. Insulation material 7 (e.g. stone wool mats) is then placed in place so that the pins penetrate through the insulation material. This is covered with a film coating 8. Such a film coating may preferably be a soft PVC plastic-coated fabric because it has good abrasion resistance and good resistance to chemicals. The film coating 8 takes the form of rolls which are rolled open in long lengths on the roof 1. In this case, care is taken to ensure that the tracks overlap. By means of the fastening device, some of the pins are placed in the areas where the overlaps are intended to be located. The length of the pins 3 is adjusted so that they are slightly longer than the combined thickness of the insulating material 7 and the film coating 8. The film coating is pressed onto the pins so that these will pierce above the film. The cover plates 9, which are provided with internal threads on the side intended to rest against the film, are then screwed onto the upper end 4 of the pins 3. A binder is placed under the cover plates 9 on the film 9. The cover plates have recesses 12 which make it possible to tighten the cover plates with a suitable tool (not shown). The cover plates 9 are tightened so that they will rest under pressure against the film coating 8.

Figure 2 shows another embodiment of the invention. In this embodiment, another type of insulation fastening member is used. Accordingly, standard type screw pins 13 are used for butt welding with a welding gun. The screw pins 13 are threaded along their entire length and also have a centering pin 6. Sleeves 14 with internal threads 14 at both ends 23, 24 are threaded at one end into the pins 13. A rod 15 with external threads at both ends 25, 26 is threaded at one end 24 of the corresponding sleeve. in the same way as in the first embodiment, the insulating material and the film coating are then applied. The total length of the rod 15, the sleeve 14 and the pin 13, when attached to each other, is slightly greater than the total thickness of the insulating material and the film coating. The film covers are then pressed down over the rods 15, using a tool (not shown) to twist the rod slightly upwards, but not so far as to twist off the sleeve (or to disengage the sleeve from the pin). The rod is held while the cover plate 9, which, as in the first embodiment, is screwed onto it.

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The tool is removed and the binder 11 is placed on the film under the cover plate. By means of the second tool, which grips the recesses 12 in the cover plate, the entire fastening member is rotated so that the cover plate rests against the film under pressure or compression.

In addition, it should be emphasized that the reason for the two different types of fasteners, one with a threaded sleeve 14 and the other without a sleeve, is that ceilings of this size often have some corrugation and unevenness, while the insulation material 7 consists of a rigid and planar plate on the roof. In order for the upper end 26 of the screw pins 15 to protrude approximately equally on the insulation over the entire part of the roof, it must be possible to adjust the length of the fastening element (s) according to the roughness of the roof by turning the threaded sleeve 14. If the roof happens to be completely flat, a uniform fastening member with pins 3 (see Fig. 1) is of course a possible construction.

Figure 2 shows the above-described embodiment of the invention with the fastening member located at a point where the tracks overlap.

Figure 3 shows a part of the oil tank seen from the side. It can be seen how the sheath is coated in segments with the plates 17.

Figure 4 shows a top view of a part of the tank roof. In addition, it is schematically indicated how the screw pins are best fitted and how the film coating tracks can be imagined to pass.

Fig. 5 shows a cross-section of the insulation, which shows how the insulation is made at the transition point from the jacket to the ceiling. This is done by placing the jacket insulation 16 in place on the jacket and then covering it with plates 17. First, screw pins 13, sleeves 14 and rods 15 are fastened to the roof as described above. An edge reinforcement 18 is fitted around the entire tank, which is fastened with rivets 19 to the boards 17. . The edge reinforcement 18 may be a steel sheet coated with PVC varnish. The insulating material 7 is placed on the roof, in which case it is taken into account that it extends up to the edge reinforcement 18. The film cover 8 is then rolled on, placed on top of the edge reinforcement, and welded onto the PVC varnish.

Figure 6 shows in principle how a welding gun works to weld screw pins. The inspection unit 20, which is connected to the voltage sensor 21, supplies current to the welding gun 2. This welding gun is intended for use in the fastening device of the screw pins 3 resp. 13 as described above. In order to obtain the attachment of the pins 3, 13 perpendicular to the roof 1, the welding gun is provided with a support 22. This support is interchangeable so that the long pin according to the first embodiment of the invention can also be attached with the desired accuracy.

The temperature during welding is such that a sufficiently strong weld is formed without any significant heating on the underside of the roof 1. Due to the small rise in temperature on the underside of the tank roof 1, it becomes possible to carry out welding without the risk of explosion and to place the insulation on top of the tank filled with volatile hydrocarbons.

Figure 7 shows a pin 13 welded to the ceiling 1 perpendicular to it.

Claims (7)

1. Insulation For ceilings on oysters and a foil (θ), which covers a heat insulating material (7) and holds it in place, as well as by means of fastening the foil, which fasteners each consist of a washer (9) and a screw pin (3, 15), whose at least upper end (4, 26) is arranged to protrude through the foil (θ) and is provided with threaded watch, the washer being arranged to be secured to the upper end (4, 26) of the side (10) of the washer abutting the foil, characterized in that the fastening means is arranged to be attached to the roof (1) of the oyster by welding, so that the length of the fastening means is so adapted that the tray will abut against the foil with pressure, that the foil is challenged in a heat-stress resistant material, with good heat insulating properties, that the washer (9) is arranged to protect and cover the foil (β) of the upper end of the screw pin and the part of the screw pin extending above the foil and that that for welding since the part of the fastening means is provided with a welding instruction (6), so that the heating of the roof of the oyster is minimized. Insulation according to claim 1, characterized in that the part of the fastening means for securing the roof of the cistern is made up of the lower end (5) of the screw pin (3) and that the screw pin (3) is formed with a center pin (6) arranged to function as a welding instruction. 3. Insulation according to claim 1, characterized in that the fastening means consists in addition to the washer (9) of a sleeve (14) provided with internal threads at both ends (23, 24), the screw pin (15) with threads at both ends ( 25, 26) and a fastening pin (13) and the washer is arranged to be attached to one end (26) of the screw pin with the side of the washer abutting the foil, the screw pin is arranged to be screwed into its other end (25) in the upper end (24) of the sleeve, such that the sleeve at its lower end (23) is arranged to be screwed onto the fastening pin, which is fastened welded to the roof, that the total length of the fastening pin, the sleeve and the screw pin, when attached to each other, is so that the tray can be brought into contact with the foil with pressure during eating, that the tray (9) is arranged to protect and cover the foil of the screwpiece (15) cut through and the part of the screwpost extending above the foil (θ) and that the fastening pin (13) is formed with a center pin (6) which is arranged to function a as a welding instruction. Method for preparing insulation according to claim 1 on roofs of cisterns, characterized in that a number of fasteners are fixed to the roof (1) by means of welding gun (2), the fastening being such that the fastening means will be upright, then insulating material ( 7) tread over the fasteners and be laid on the roof, so that the insulation material is covered with a long, overlapping web length resistant, water impervious foil (θ), which is pressed down over the fasteners, which will then protrude through the foil, and then the washers (9) are screwed onto the fasteners. 5. A method according to claim 4, characterized in that first a plurality of fastening pins (13) are mounted upright on the roof (1) by means of a welding gun (2), one of which is screwed into each with internal threads. both ends (23, 24) provided with sleeve (14), screwed onto the upper end (24) of a sleeve (15) which has external threads at both ends (25, 26), that an insulating material (7) is threaded over screw bolts and laid on the roof (1) so that the insulating material is covered by long, overlapping web lengths, resistant, water impervious foil (8), which is pressed down over the rods (15) which will thus protrude through