WO2011046449A1

WO2011046449A1 - Floating boom, use thereof and method for collecting impurities on a sea surface

Info

Publication number: WO2011046449A1
Application number: PCT/NO2010/000365
Authority: WO
Inventors: Egil Norvald Sulen
Original assignee: Egil Norvald Sulen
Priority date: 2009-10-15
Filing date: 2010-10-15
Publication date: 2011-04-21
Also published as: NO333545B1; NO20093148A1; EP2488701A4; EP2488701A1

Abstract

A device is described for a boom (1 ) for collection of floating and/or solid polluting material from a sea surface, comprising an extended cloth (10) with floating elements (12) and also struts (20) that can hold the boom/cloth (10) in a mainly upright position in the sea, and where the cloth (10), at its lower end, further comprises weight elements to hold the boom down in the sea. The boom is characterised in that, in the longitudinal direction of the cloth (10), in the area of the cloth which is intended to be adjoining the surface of the water, a collection pocket (30) for the polluting materials that are collected from the whole length of the boom (10) is located, and the boom cloth also comprises one or more openings (32) that lead into said pockets. A method and different applications of the device are also described.

Description

Floating boom, use thereof and

method for collecting impurities on a sea surface.

The present invention relates to a device for a boom for collection of floating and/or solid polluting materials from the surface of the sea, comprising an extended cloth with floating elements, and also struts that can hold the boom/cloth in a mainly upright position in the sea, and where the cloth in the lower part further comprises a weight element to keep the boom down in the sea. The invention also relates to different applications of the device, and also a method for collection/isolation of floating and solid polluting materials on a sea surface, and which one wishes to isolate from harmful spreading in the sea, to carry out a collection for further proper treatment, either immediately or later. With chemicals one thinks, in particular, of floating chemicals, oil products such as crude oil, paraffin, diesel oil, bunker oil, and all other chemicals which unintentionally one can imagine can be released into the sea from a vessel or an installation on land as a consequence of a shipwreck or leaks from a ship or installations on land.

In the following, the invention shall be explained in detail in connection with oil pollution on the sea surface without that one shall be limited to this specific type of pollution. Prior art.

Pollution of water (fresh water lakes, rivers and oceans) such as by oil or other chemicals which can float (on water) when transport ships and the like become shipwrecked, is a considerable challenge as the damage can be very extensive. It is important to limit the damage caused by uncontrolled release of oil and other chemicals as efficiently and quickly as possible. An important known action is to launch oil booms in the sea that can collect the polluting materials, so that the spreading of the oil spill on the sea surface is prevented or limited. Oil booms are set out in the sea both as a preventative action when danger for an oil release arises or while/after the oil has been released into the sea. An essential part of the prevention of damage means that one must be able to efficiently isolate, collect and remove the polluting material that is spreading, floating out over the sea surface.

One of the challenges in this connection is that oil booms should be launched quickly to limit the spreading of the polluting material. At the same time, many of the shipwreck locations are difficult for vessels bringing collecting equipment to access. Therefore the collecting booms are not fast enough brought out to the location.

With regard to prior art, reference is made to the following patents: International patent application WO 8300890, US patents US 4,272,214, US 4,957,498 and US 5, 197,821 , and also British patent GB 2,257,377 and Russian publication RU 2022101 .

In the patent application WO 8300890, a boom is described in the form of a net with a small mesh that is standing approximately upright in the sea, which collects and catches the oil. The net is fitted with floating elements and support elements to keep it upright.

Aim of the invention

The aim of the invention is to provide an efficient device for an oil boom for isolation and collection of oil spills in water, where the boom has a construction that makes it easy to store in a depot, simple to transport to the location of the spill and thereafter to bring it back to the depot.

Furthermore, it is an aim of the invention to provide a boom of a special stabilising construction that makes it more stable in an upright position in the sea than other known boom types.

It is a further aim of the invention that the boom can be transported with an aircraft, such as a helicopter, by air and forward to the location of the spill where it is directly put into active operation. However, a such airborne transport puts great demands with regard to the weight of the booms and how they are constructed to take up as little space as possible, and how they are wrapped up or stored for transport out to the practical handling when launching in the sea. It is an aim of the invention to provide a boom construction that shall carry out a first quick isolation of the release to limit the spreading until a more permanent boom equipment from a main depot has been put in place at the location of the spill.

It is also an aim of the invention that the boom is fitted with outlets for connection to collecting equipment with suction pumps and hoses to collect and remove polluting material that is collected in the boom, as a such function can also be omitted at the location of the spill, dependent on when the other heavier equipment can be launched at the location of the spill.

Furthermore, it is a main aim with the boom that it can be rolled up and stored on a drum, easily brought to the location of the spill with a helicopter which then carries out a quick setting out of the boom round the location of the shipwreck, i.e. in a direction that catches the polluting material.

The present invention

The device according to the present invention is characterised in that an enrichment pocket for polluting material that is collected along the whole of the length of the boom is arranged in the longitudinal direction of the cloth, in the area which is intended to be adjoining to the water surface, and that the boom cloth comprises one or more openings that lead in to said pocket.

According to a preferred embodiment, the pocket represents an integrated part of the cloth and is formed by folding of the cloth. The struts are preferably rigidly fastened to the side of the cloth, mutually spaced apart for a permanent formation of said pocket in the cloth.

Another favourable alternative is that there is a longitudinal slit that forms an entrance to the pocket.

According to a preferred embodiment the slit/entrance is defined by upper and lower extended floating bodies that are fastened to the cloth alongside the cloth.

These and other preferred embodiments are also given in the dependent claims 2-14. The method according to the invention is characterised in that the setting out of the boom from a boat or a helicopter is carried out in the following steps:

- the boom is stored rolled up on a drum, or in a layered form during the transport by a water vessel/helicopter, whereby a release hook holds a drift anchor in the same position during the transport,

- during the setting out the release hook for the drift anchor is released so that the drift anchor falls into the sea and thereby provides the necessary resistance by a simultaneous movement of the vessel/helicopter and/or stream of water so that the oil boom is pulled out from the container and the boom is placed round or adjoining to the oil polluted area of water,

- optional connection of a number of oil booms after the setting out with the help of fastening devices at the ends, and/or

- optional connection of the ends from one or more oil booms to a closed device.

According to a preferred embodiment the oil spill is collected in the collecting pocket by the oil boom, whereupon the collecting pocket is emptied by pumping out the material. Advantages with the present invention

The boom can, with its flexible vertical struts, be made taller and be brought to stand deeper in the sea than those on the market today. This means that it can withstand extreme wave heights and wind conditions and still operate, as it will bend and straighten up in step with the influences from wind and waves above the surface of the water.

Deeper booms below the water surface and relief flaps/holes to let through strong water currents through hatches in the underside of the boom will ensure that the boom, as much as possible, retains a vertical position in the sea.

Openings along the whole of the length of the boom in the water surface to the collecting fold results in an optimal opportunity for collection of the oil spill before the oil spill glides under the boom in strong currents and wind. Because of the light and extremely strong new materials which are available at present, the weight of the boom is considerably reduced so that it can also be launched from a helicopter. This means that there is the possibility for a much quicker response to give "first aid" to a shipwreck, something which is not possible with the booms available today. From experience we know that a quick reaction to a shipwreck with a danger for release of oil is alpha and omega in this connection.

The boom itself, with the floating elements and struts, is extremely thin so that several hundred meters of boom can be coiled up onto one single drum.

The boom can be launched from a helicopter without the help of the crew/boats in bad weather with an anchorage at both ends.

The boom can be placed deeper below and higher above the surface of the water than other booms because of the design with struts that gives extra stability.

The longitudinally running fold in the middle operates to stabilise the boom and works as a collection pocket for polluting material.

Description of the figures

Embodiments of the invention shall now be described with the help of examples, where reference is made to the enclosed drawings: Figure 1 shows a longitudinal outline of the oil boom device.

Figure 2 shows a vertical section of the boom.

Figure 3 shows an enlarged perspective of the boom.

Figure 4 shows the oil boom coiled up on a drum for transportation.

Figure 5 shows the launching of the oil boom by a helicopter, in that a grapnel and a drift anchor are released and dropped into the water and the drum is released so that it can rotate and the cloth is coiled off. Figure 6 shows a situation where the boom according to the invention is pulled through the sea by two vessels and where a third vessel behind the boom collects the polluting material. Embodiments of the present invention

By way of introduction, reference shall be made to figure 1 that shows an oil boom 1 in the form of an extended cloth 10 with mutually separated longitudinal and, in the main, parallel floating lines or floating elements, upper 12a and lower 12b floating elements, and are arranged along the central part of the cloth 10 in its longitudinal direction. Between these floating elements 12a and 12b an extended slit 32 in the cloth 10 is defined and which in turn defines the entrance to a hollow space 134 that is defined by a cloth bag/fold or pocket 30 as shall be explained in the following. The float line and/or the floating elements 12 in the longitudinal direction contribute to keep the oil boom in the correct position in the sea 2. To hold the part of the cloth that is above water vertical and upright a number of flexible struts/tubes 20 are arranged across the longitudinal direction of the cloth 10, which are preferably evenly spaced and stretch across the whole height H of the boom. The struts may be fastened or sewn with a strong thread 10 to the cloth 10 with the help of grommets or they are welded into the cloth material. Alternatively, they can be inserted by being pushed into small pockets that run across the longitudinal direction of the cloth. Before the struts 20 are fastened, a fold 30 is made that defines a longitudinal pocket 134 with an entrance through the opening of the slit 32 with the fold 32 running mainly along the whole of the longitudinal direction of the cloth. Along the length of the fold, (optional) pipe ends 136 give possibilities for connection of hoses with associated pumps to be able to remove the polluting material or oil spill from the pocket 134, cf. figure 6, for continuous, or batch wise removal.

The strut/tubes 20 give the construction two important features. Firstly, they contribute to stiffen the cloth 20 so that it can stay upright (mainly vertical) in the sea with regard to the water line 3, at the same time as they are sufficiently flexible to bend over when they are exposed to wind at a given strength above a certain size. The floating elements comprise two extended float bands that are fastened along the length of the cloth, and which between them define the entrance 32 to the fold hollow space. Secondly the fixed fastening of the struts in the folded cloth contributes to the cloth not being stretched in the cross direction, and the pocket or the fold 30 is thereby stabilised. Furthermore, the fold has two main functions when in use, namely that a part of the polluting material 4 that floats into the collection unit can be accumulated as a collected mass or waste 34 inside the hollow space 134. Secondly, it remains lying horizontally, partially below and above the water surface, and will contribute to stabilise the whole of the boom construction in its upright position. It gives a wanted inertia against rapid movements, such as effects of waves and gusts of wind, in the whole system.

This ensures that the oil boom can easier withstand extreme weather conditions. In particular, it means that the part of the boom that lies above water can be bent as described, while the part under water keeps itself more stable in an approximately vertically upright position.

The fitted fold or bag 30 forms the collecting volume 134 for the polluting material such as an oil spill 4 from the surface of the water 3. Thus, the fold has its opening 32 facing the side of the oil boom where the oil spill 4, which is spread out over the sea surface, is floating towards it. Thus, the oil can flow into this bag construction and fill it up, so that the oil is thereby isolated and collected. The collecting bag/fold 30 prevents that the oil spill (or any other spill ¾ of chemicals which are lighter than water and thus floats on the water) can be forced below the cloth 10 when there are strong winds or water currents.

Instead one gets the polluting material 4 to float into the collecting bag 30 for collection. Practically, the oil layer 4 can be efficiently collected in that it is transported by a flow of water such as the tidal current, other ocean currents or wind 5 and into the collecting bag 30.

The bag 30 is therefore fitted with an opening 32 along the whole length of the boom 1 with the opening facing the oil pollution 4. When the weather permits, the bag can be emptied in that the oil is, for example, sucked out of the bag while the boom is in use on the sea, i.e. without this emptying having any effect on the other functions of the boom 1 , Practically, this can be carried out in that a hose with a suction pump (not shown) is connected to the pipe end 136 that can be fitted to the topside of the pocket 30. The struts 20 can extend 5-10 cm above the upper edge of the boom 10 to provide possibilities for fastening of necessary equipment, such as serving ropes 35, and which one wants to connect to the boom.

The boom/cloth is assumed to be more or less continually subjected to wind and current after being set out in the sea. It is desirable that the opening 32 of the collecting bag will be of a suitable size, for example 10-20 cm. The cloth is therefore fastened to the flexible, vertical struts 20 in such a way that the opening 32 has an approximate constant size along the whole of the length of the boom 1.

The flexible struts/pipes 20 are preferably made from fibreglass and can comprise materials and/or be shaped corresponding to (telecommunication) aerials or fishing rods, or of the type that is used in pole vaulting. These types of material have characteristics that make them extremely flexible, at the same time as they can withstand very strong winds.

In a preferred embodiment of the construction according to the invention, a wire and/or a lead weighted line 40 with suitable dimensions is placed along the bottom edge of the cloth 10 along the whole of the longitudinal direction. This contributes to this part being able to hold the boom 1 downward and keep it standing approximately vertically upright in the body of water 2. An extended flat, belt-formed elastic band 41 of a type similar to a car seat belt is fastened along the bottom edge of the cloth, which is used to connect the fastening grapnel 74 of the line 73 (figure 3). Correspondingly, an elastic band 43 runs along the length of the boom cloth in the middle section, i.e. in the cloth at the lower edge of the entrance 32 of the pocket 134. Figure 3 shows how this belt is connected to the line/wire 75 for connection to the fastening grapnel 74.

The wire/weight elements/chain 40 can be fitted with adjusted stoppers (not shown) at each end. This, together with the described flexible struts 20, will give the boom a unique construction which is light, strong and flexible at the same time. The wire/weight elements/chain 40 can be fastened in a known way by, for example, being sewn into the edge of the cloth, or being threaded into an extended pocket along the edge of the cloth. A chain can also be arranged hanging below the cloth, for example, by being fastened to grommets in the cloth.

It is also advantageous that loosely hanging flaps/openings 50 are cut out in the lowest part of the cloth 10 below the waterline 3 that can open holes for through-flow of water in strong currents so that the lowest part of the oil boom 1 does not lie down flat in the water and lets oil out below the oil boom 1 in bad weather (figures 1 and 2). This prevents that oil spills 4 are forced under the cloth 10 at the same time as it contributes to the cloth 10 being better stabilised in an upright position in conditions of strong winds and strong currents.

The oil boom device 1 according to the present invention is preferably also fitted with one or more grapnels, or drift anchor(s) 60 that are fastened with a rope 61 or the like at the end(s) of the boom for the setting out and temporary positioning / anchoring of the boom 1. The boom 1 can, for example, be set out in the water from a helicopter 80 or a boat in that the drift anchor is released, and the boom is pulled round/along the location of the shipwreck (figures 5 and 6). The boom can be stored onto and be coiled off from a drum/roller 70 where the shaft of the drum is arranged horizontally, or stored in a container that is suitable for the current purpose.

An example of such a drum is shown in figure 4. The drum 70 is fitted in a frame 100 that holds the drum, comprising a lifting yoke 102 and side walls 104 (built as a trusswork frame) where the drum, with its axis of rotation 106, is fitted into an unadapted groove with a seat on each side. As figure 4A shows, a braking shoe 1 10 that can be regulated is forced around the shaft 106. It can be regulated in that the braking force against spooling off of the cloth 10 can be adjusted dependent on the actual coiled-up boom, so that a constant braking of the coiling out is obtained so that the drum 100 can not rotate freely and let out the boom in an uncontrolled fashion.

During the coiling up of the boom onto the drum 70, a number of grapnels 108 are placed inside adapted hollow spaces in the shaft casing 106 and the boom 10 is then rolled onto the drum 70. Finally, the grapnel 70 connected to the line of the boom cloth is fastened on the outside of the drum. The drum 70 is preferably transported lying as shown in figure 4. The drum and a grapnel, and possibly a drift anchor 60, are secured, for example, by a release hook 72 such that they can only be released in a controlled way at the setting out of the boom 1 from a boat or helicopter 80. When suspended during transport, the drum/roller 70 is preferably fitted with a swivel 74 (figure 5) in the suspension line 174 of the device so that it can easily rotate horizontally during the setting out itself (after the drum has been released for coiling out).

It is also possible to have the boom drum mounted in a container for the transport and/or setting out and that the boom 1 coiled up on the drum is led into the container and stored. The boom can then be coiled onto a rotary drum/roller/cylinder which is suspended horizontally in that a rotary shaft runs through the central part of the roller in the longitudinal direction and is mounted in the wall construction of the container, where it is rotary suspended. The boom can be wound off in that the roller rotates round the central roller shaft. Corresponding braking appliances are used as shown in figure 4 for regulation of the speed of rotation which makes it possible to regulate/control the setting out of the boom.

To prepare the boom (for example, in a store prior to setting out) the drift anchor 60 and the hook 78 are unfastened so that these hang down when the rolling out of the boom starts. Preparing at the depot for the setting out of the boom consists of controlling that the boom 10, roller 70, drift anchor 60 and rope to the drift anchor 62 are in the right position, and to make the grapnel 78 and drift anchor ready to be released. These elements is to suspend under the boom that is rolled out, while how they are fastened to the drum frame is shown at the top right hand corner in figure 4.

The helicopter securely hooks up the wire 174 in the drum yoke 102 and the container 76 and the whole drum can be flown out to the location of the shipwreck to launch the boom.

The boom can be made from a strong and light cloth, for example, of canvas. Typical suitable materials can be, for example, known materials such as aramide, polyester, Kevlar, Dacron, Mylar. Especially preferred are canvas materials and other light, strong cloth materials. Any other material with corresponding characteristics can also be used. Such materials will give the cloth 10 lightweight characteristics which makes it possible to transport it with the help of a helicopter 80 to the location of the operation for handling of an oil spill. The cloth 10 can be made in different dimensions according to need. In a preferred embodiment of the present invention it is possible to put together several oil booms 1 in a modular way after setting out, in that each module has devices for connection/fastening at the ends (not shown). The advantage of this modular device is that it increases the flexibility with regards to the area/size of the area where the boom shall be set out, at the same time as it reduces the logistic problems associated with transport/storage of relatively large units and also in the setting out of large units. For example, in about 10 meter lengths from each end, such a device can be made to couple together two or more booms 1 , or to close one or a number of booms in a ring form. This can be carried out, for example, during operation by sewing in hooks/loops/grommets or the like. This is preferably carried out at sea or on the water from a boat, or after the booms 1 have been set out.

According to a current example of the boom, the cloth 10 is approximately 3 meters tall, 100 meters long and will stand approximately vertically in the sea when it is set out, and extends preferably 1 meter above and 2 meters below the waterline 3. The fold itself can lie horizontally over the back side of the boom and extend horizontally of the order of 1 -5 meters, dimensions that depend on the other measurements of the boom. Cleaning of the cloth 10 can, for example, be carried out with the help of rinsing with water. By choosing suitable materials, according to the present invention, oil does not, or to a very small extent, stick to the cloth material.

Setting out.

Figure 5 shows a helicopter 80 which transports an oil boom 10 out to the location of the wreckage. By release of the release hook 72 in figure 4 the drift anchor 60 is released (figure 5). The grapnel 78 and the drift anchor 60 fall into the sea and provide the necessary resistance so that the boom 1 is pulled out from the drum and the helicopter 80 can set out the boom around, or adjoining, the location for the wreckage and/or the oil contaminated area.

Several booms 10 can be connected together with the help of hooks/loops/grommets that are fastened in an approximately 10 meter length area at each end of the boom. Any possible connections are made from a boat when the booms 1 are in place at the location of the wreckage.

The boom can be anchored in the normal way to hold its position when it has been set out assuming that the location of the wreckage is of a type that makes this possible with respect to conditions such as the state of the sea bottom, access for boats, weather, etc.

Bringing in

When the collection is completed, the boom 10 is taken up from a boat and is made ready, cleaned and stored on the drum 70 and is thereby ready to be used again.

Experimental testing of suitable cloth material for the purpose:

The actual cloth 10 of the type WEB-TECH (Flex) was tested with oil waste from the Gullfaks field in the North Sea for penetration of oil through the cloth material. The oil was poured over a freely suspended part of the cloth and observed/photographed at regular intervals during the actual duration of the test. After about 100 hours of testing no penetration of oil was found. The cloth could be effectively cleaned with cold water without the use of high pressure hosing.

The present invention is suited to any other type of chemical spills than oil providing it floats on the sea and can thereby be hemmed in/collected with the help of the device according to the present invention. The boom according to the invention can be used in seawater, brackish water and fresh water.

The boom is primarily intended as a quick first aid to isolate oil spill problems from a shipwreck or a leakage as early as possible to avoid, in particular, the catastrophic consequences of oil pollution especially in beach areas that can occur along the coast far away from the location of the leakage.

More permanently, the boom can also be set out in inlets and straights which shall be protected against potential pollution. It may also be used to protect riverbanks along small and large rivers.

In another embodiment the oil boom is suited to being towed by a vessel such as a boat. For this purpose the oil boom is preferably reinforced with several layers of cloth or made from an especially stable material. According to this example, which is illustrated in figure 6, one uses the present construction as a towing boom, the two ends of which can be fastened to, and be towed behind, separate ships 120, 122 that move forward in the direction of the arrow 138, or that the boom is connected to, and pulled by, a single vessel only.

The oil spill 4 is collected inside the boom 10 and will gradually flow through the slit 32 and into the pocket 30 at the back of the boom. One or more hoses 140 are connected to the pipe ends 136 (figures 2-3) and the oil is thereby sucked up, with the help of pumps (not shown), from the fold/pocket 134 at the back of the boom and over to a storage tank onboard a vessel 146.

In another preferred embodiment the oil boom according to the invention can constitute a part of the safety equipment on any ship, such as tankers, so that this emergency equipment quickly can be taken into use at a location of a shipwreck, or where there are leaks of oil and the like. For this application the oil boom will preferably be stored on the deck of a ship in a container. In a breakdown and when the circumstances allow it, the oil boom can be set out directly from the shipwreck. For this purpose the oil boom is preferably fitted with a drift anchor and a floating buoy so that it can be caught by the mob-boat of the ship or other vessels that come to help or from a helicopter, to be pulled around the shipwreck. A possible oil spill is thereby kept in check inside the boom until larger collecting equipment can be brought to the location and be taken into use around the wreckage.

It shall be understood that the features of the present invention as described above can be modified within the frame of the subsequent claims.

Claims

P A T E N T C L A I M S

1. Device for a boom (1 ) for collection of floating and/or solid polluting materials from the surface of a sea, comprising an extended cloth (10) with floating elements (12), and also struts (20) that can hold the boom/cloth (10) in a mainly upright position in the sea, and where the cloth (10) at the lower part comprises weights to keep the boom down in the sea, characterised in that in the longitudinal direction of the cloth (10), in the cloth area which is intended to be adjoining the water surface, an enrichment pocket (30) is arranged for the polluting material that is collected from the whole of the length of the boom (10), and the boom cloth comprises one or more openings (32) that lead in to said pocket.

2. Device according to claim 1 , characterised in that the pocket (30) constitutes an integrated part of the cloth (10) and is made by folding of the cloth (10).

3. Device according to claims 1 - 2, characterised in that the struts are rigidly fastened to the side of the cloth (10) with a mutual distance for a permanent formation of said pocket (30) in the cloth.

4. Device according to claims 1 -3, characterised in that a longitudinally running slit (32) forms the entrance to the pocket.

5. Device according to claims 1 -4, characterised in that the slit/entrance is defined by upper (12a) and lower (12b) extended floating bodies that are secured to the cloth along this.

6. Device according to claim 1 , characterised in that the cloth (10) further comprises flaps (50) below the surface of the water (3) where the water can flow through in conditions of strong winds or currents.

7. Device according to any of the preceding claims, characterised in that the cloth (10) is made from a light and hard-wearing material, preferably corresponding to canvas materials, for example, aramide, polyester, Kevlar, Dracon, Mylar.

8. Device according to any of the preceding claims, characterised in that the struts (20) are made from flexible, elastic materials preferably fibreglass.

9. Device according to any of the preceding claims, characterised in that the device (1 ) is fitted with one or more drift anchors (60) in connection to one or both longitudinally running end(s) of the oil boom device (1 ).

10. Device according to any of the preceding claims, characterised in that the boom (10) is made to be coiled up on a roller (70) and set out at a location of use by being rolled out from the roller (70).

1 1. Device according to claim 10, characterised in that the roller (70) is placed in a frame (104/102) for the operation and setting out at a location of use with the help of an aircraft, in particular, a helicopter, with the frame comprising braking bodies (1 10)for a controlled rolling out of the boom from the roller (70).

12. Device according to any of the preceding claims, characterised in that the boom is formed with fastening appliances at the horizontal ends of the device for modular connection of several units (1 ).

13. Device according to any of the preceding claims, characterised in that the collecting bags (30) are fitted with an opening (136) for the removal of impurities from the pocket (30).

14. Device according to any of the preceding claims, characterised in that the cloth (10) is coiled up on a drum/roller (70) for transport by boat or helicopter and for storage, in which the drum/roller (70) is fitted with a number of release hook(s) (72).

15. Application of the boom according to one of the claims 1 -14 for isolation of chemical pollution in the sea (4) and/or as a guard against the danger of release of chemicals (4), in particular oil.

16. Application of the boom according to one of the claims 1 -14 for connection to one or more vessels (120, 122) to be pulled through the sea to collect and remove discharges of chemicals, in particular, oil.

17. Method for collection/isolation of floating and solid polluting material on the surface of the sea by the application of a boom as given in the preceding claims 1-14, characterised in that the setting out of the boom from a boat or helicopter is carried out in the following steps:

- the boom (1 ) is stored rolled up on a drum (70) or stored in the form of folded layers during transport by a water vessel/helicopter, whereby a release hook (72) holds a drift anchor (60) in the same position during the transport,

- during the setting out the release hook (72) for a drift anchor (60) is released so that the drift anchor (60) falls into the sea and thereby provides the necessary resistance at the simultaneous movement of the vessel/helicopter and/or from a water current so that the oil boom (1 ) is pulled out from the container (76) and the boom (1) is placed around or adjoining the oil polluted water area,

-optional connection of a number of oil booms (1 ) after the setting out with the help of fastening devices at the ends, and/or

-optional connection of the ends of one or more oil booms into a closed device.

18. Method according to claim 10, characterised in that the oil spill (4) is collected in the collecting pocket (30) of the oil boom whereby the collecting bag (30) is emptied by the use of pumps.