WO2009082241A1

WO2009082241A1 - Safety hose

Info

Publication number: WO2009082241A1
Application number: PCT/NO2008/000466
Authority: WO
Inventors: Bjørnar BERTHEUSSEN
Original assignee: Bertheussen, Kenneth
Priority date: 2007-12-20
Filing date: 2008-12-22
Publication date: 2009-07-02

Abstract

A safety hose for transferring fluids between a floating structure, and another fixed or floating structure, is described. The safety hose is subjected to dynamic loads, including torsion, and comprises a main hose (1) which carries said fluid, a secondary hose (2) coaxially arranged around the main hose (1), a sealing connection between the main hose (1) and the secondary hose (2) for creation of a cavity (3), and a swivel (40) at least at one of the ends of the safety hose. A combined breakaway coupling and fluid swivel (20) is mounted at least at one location Along the length of the safety hose.

Description

Safety hose

The present invention relates to a delivery hose in the form of a safety hose for transportation of mediums between a floating structure and a fixed or floating installation, where the safety hose is being subjected to dynamic loads, including torque or torsion, which safety hose comprises a main hose transporting said mediums, a secondary hose arranged around the main hose, a sealing connection between the main hose and the secondary hose to form an interspace therebetween, and a swivel in at least one of the ends of the safety hose.

Delivery hoses, or transfer hoses, are used for transportation of various types of mediums in a number of different applications, both by delivery, collecting and transfer of medium between vessels and offshore installations for example. Mediums can be based on oil related products, chemicals, gas, dry bulk or other liquids. It is material to reduce risk when delivery hoses are used in environments that are vulnerable for pollutions from such mediums. Maritime operations can represent typical examples, where spill of a medium may cause particularly serious consequences. Such use can be every day events where the delivery hoses are reeled out from huge reels on board a rig and over to a floating vessel at safe distance from the rig and where the delivery hose is deployed in the sea.

Safety hoses of this nature are developed to reduce the risk for uncontrolled spill of medium by failure in hose or couplings. Thus they have integrated safety measures for hose rupture, both against leakage, wear, tension and torsion. If damage or rupture should arise, means exist to alert about the problem, and the operator can effectively implement necessary measures.

One further object with the invention has been to provide a hose that is collapsible so that the hose occupy as little volume as possible on a winding reel when not in use.

From US Patent no. 3,426,803, issued 11 February 1969, it is known to make a dual walled hose with air and water filling to the interspace in order to achieve buoyancy or sinking ability. The hose, however, does not have replaceable parts, nor is the outer hose designed to constitute a safety hose.

From US Patent 4,004,607 (Freese, 1977) it is inter alia known to install a closing valve at the entrance to a pressure hose designed for high pressure. This closing valve is being activated through a control wire connected to the circuit that is to be protected. This solution is complicated to implement and may introduce uncertain factors that are undesirable.

From International Patent Application WO 03044413 (Qutub Abe, 2003) it is well known to arrange a dual, outer hose over a pressure hose, to increase the life time for the hose as a whole in this way. This, however, can not prevent that the hose system fails and results in leakages.

From US Patent Application 2002017330 (Armenia mil. 2002) it is known to make a dual walled hose having an outlet opening in the outer hose for liquid that might leak out from the inner hose. Indeed, this solution provides a possibility to collect the leaked liquid, but this is a possibility that requires comprehensive adaption and which is not realizable in a variety of fields of use.

From US Patent Publication 6,085,796 (Riga 2000) it is known to make a double walled hose where the outer hose can collect leakages from the inner one. This increases the life time of the hose, but do not remove the risk that an unforeseen leakage can take place by a failure in the outer hose. Besides, this hose is designed as an integrated unit which needs to be replaced as a whole when leakage occurs in the inner hose.

From US Patent Publication 6,032,699 (Coehran mil. 2000) a double walled hose is known, where the intermediate space between the hoses is filled with an inert gas having higher pressure than the working pressure within the inner hose. In case of formation of openings within the inner hose, gas will then be forced into this one from the outer hose. This is a less suitable solution for hoses working under high pressures, and that it can be difficult to identify stable gases that do no react with the medium of the main hose.

From US Patent Publication 6,550,499 (Pai 2003) it is known to make a double walled hose with a leakage sensor provided in the intermediate space between the inner and outer hose. Here the two hoses are securely interconnected at the end terminations, which require a dedicated hose design. Besides, if failure in such double walled hose occurs, it will be necessary to replace the entire hose system.

From Norwegian Patent no. 323 383 it is known to make a high pressure hydraulic hose system, with pressure sensors which are designed to indicate pressure increase in the safety hose by a signal of the type "on/off. On the other hand, the system can not currently detect pressure variations, temperature or humidity values due to sweating, or minor leakages, for example, nor is the solution designed for detecting hose failure in vacuum and suction hoses. The hose system is not designed for transportation of medium, but transfer of energy in a hydraulic installation. The system is not designed to be afloat.

None of the known hose systems have individually or in contemplated combinations proved satisfactory for transportation of mediums during demanding maritime operations.

According to the present invention a safety hose of the introductory said kind is provided, which is distinguished in that a combined break-away coupling and fluid swivel is arranged at least at one location along the longitudinal extension of the safety hose.

The break-away coupling is provided to achieve controlled rupture in the hose if a situation arises. The break-away coupling has two main purposes. One is that the coupling constitutes the weak point of the safety hose such that the hose separate just there when overloaded. The other purpose is to be able to shut off the hose immediately if rupture occurs in order to prevent flowing fluid to spill into the environment. Breakaway couplings exist in many variants from different suppliers.

The fluid swivel is, in turn, provided to achieve continuous relief of potential torsional forces or torques that may arise in the safety hose during winding out and in use. Until today the function of the fluid swivel has not been put into effect until the entire reel is emptied for hose, i.e. that the swivel is located at the inboard end of the hose.

It is to be understood that the main purpose with the invention is to improve known double walled safety hoses, such that they can be used to prevent leakages during complicated maritime operations, where inter alia safety, floating ability, measurability and general sturdiness are crucial factors.

Moreover, in largest possible extent, it will be desirable: - to base the safety hose on existing standard components

- to be able to adapt the detection of the operating condition to different purposes of use

- to be able to perform maintenance in a simple and reasonable way and

- to create a safety hose where it is possible to demonstrate wear before failure that can cause damage or shutdown arises, so that preventive maintenance and repair can be carried out.

In a preferred embodiment a swivel is arranged at both ends of the safety hose.

Suitably, the break-away coupling includes two fluid swivels, one at each side thereof when viewed in the longitudinal direction.

In suitable embodiments the safety hose may include means to introduce air and/or water into said interspace. In practical embodiments the means to introduce air and/or water can be hoses extending in the longitudinal direction of the safety hose and passes through said combined break-away coupling and fluid swivel.

If damages or rupture should occur, the sensors will be able to alert the problem and the operator can effectively implement necessary measures.

Thus the safety hose may preferably include at least one of following sensor means: pressure sensor, temperature sensor, humidity sensor and break-away sensor having associated conductors to a control unit.

It is, however, commonly known to install pressure sensors in hose systems in order to detect pressure fall due to hose rupture and through this provide shut down signal to valves and pumps. But this measure has not prevented that hose rupture has resulted in loss of medium and further pollution due to this.

It is also known to install pressure sensors in hose systems in order to detect pressure increase in safety hoses, but this system can not discover minor leakages or rupture in for example vacuum hoses, nor has the system any floating ability.

It is further to be understood that it is known a number of proposals to make dual hoses in order to increase the safety against leakages caused by hose rupture.

It is also to be understood that it is known to use both a swivel and a break-away coupling in delivery hoses, but none of these has combined the functionalities into one single coupling. Neither have they been described with several runs or break away sensors.

In a convenient embodiment the break-away coupling comprises two substantially complementary break-away coupling components that carry respective shut valves and a break-away sensor, where the two substantially complementary break-away coupling components are kept together by a number of rupture bolts that breaks off at predetermined axial load.

Conveniently, each fluid swivel part at the break-away coupling is relatively rotatable in respect of the break-away coupling components via friction reducing means, such as balls or similar.

In a suitable embodiment each fluid swivel, at the break-away coupling, alternatively the break-away coupling components, has fluid transfer passages for transfer of fluid via a swivel.

In one embodiment the pressure sensor may include a digital gauge which is designed to indicate pressure and pressure changes within the safety hose by a current signal of a value close to real time.

In one embodiment the humidity sensor may include a digital gauge which is designed to provide a signal for humidity and temperature within the safety hose of a value close to real time.

In one embodiment the safety hose can have one connecting point to fill in and drain gas to and from the safety hose.

In a further developed embodiment the safety hose for transportation of mediums between a floating structure and a fixed or floating installation can, as mentioned, include means to introduce air and/or water into said interspace. With such means a possibility is obtained to trim the ballast of the safety hose, either if buoyancy is desired or to submerge the entire safety hose or parts thereof. If the safety hose extends between a vessel and a platform, it will be desired to keep the hose afloat as much as possible and thus inflate the hose to increase the buoyancy.

If the safety hose extends between a subsea installation and a vessel, an operator will be able to ballast with water the hose section which is close to the sea bed and fill air into the hose section which is located on the water surface and where the partition between these two sections is the break-away coupling with the swivel or swivels.

In one embodiment the means for introduction of air and/or water comprises hoses extending in the longitudinal direction of the safety hose and pass through said combined break-away coupling and fluid swivel.

By the above described solution several decisive advantages are obtained:

• the hose system can be assembled of already available or easily manufactured components

• the gas stratum in the intermediate space between the main hose and the safety hose results in increased buoyancy and good floatability

• the angle of incidence the safety hose achieves to a floating vessel is getting more horizontal also when the hose approaches the sea bed (traditional hoses used for sea bed operations gets an angle of incidence more vertically towards the sea bed which leads to large loads on the hose when waves carry the vessel in motions up and down which subject the hose for tension and compression forces until the hose collapses. It is known that compression forces leads to hose collapse since hoses are made to withstand tension. By a horizontal angle of incidence the compression forces fails to appear in the hose).

• the air filling system with intermediate hoses and valves leads to that the anterior part of the safety hose is firstly totally filled up, before air is let into the rear part. This is a great advantage when the hose is wound out from a reel on a rig, for example, because the first part of the safety hose that hits the water and the receptacle is firstly filled up completely, and because the hose does not need to be totally unwound to be able to rapidly fill and drain the hose.

• high security against leakage of transported medium to the surroundings is achieved: o because the safety hose will intercept medium from a leakage in the main hose, in addition to alert the operator about the leakage. o because the break-away coupling automatically will separate and close the hose system at overload tension, and alert the operator about the rupture. o because the swivels will prevent potential torsional damages. • by simple means failures and can be discovered and repaired before leakage takes place.

• by repair, the replacement of parts is limited to the defective parts of the system.

• repairs are therefore easy to conduct and can take place with correspondingly standardized components as the new system. • the invention will, in immaterial degree only, require more space at the end termination couplings, while it takes less space between the end termination couplings on the flexible part of the system when the hose is drained for gas, than corresponding known hose facilities.

Other and further objects, features and advantages will appear from the following description of preferred embodiments of the invention, which is given for the purpose of description, and given in context with the appended drawings where:

Fig. 1 shows an elevation view, partly in section, of a safety hose with swivel and break-away coupling according to the invention,

Fig. 2 shows the same as in figure 1, but rotated 90° relative to figure 1,

Fig. 1 and 2 also show together an overview over which encircled parts in figure 1 and 2 that are kept together in later figures,

Fig. 3 shows a detailed view of the upper encircled part of fig. 1, Fig. 4 shows a detailed section of the upper encircled part of fig. 2, but with the parts separate from each other,

Fig. 5 shows a detailed view of the intermediate encircled part of fig. 1,

Fig. 6 shows a detailed view of the intermediate encircled part of fig. 2,

Fig. 7 shows a situation where the break-away coupling is broken and the hose parts breaks apart,

Fig. 8 shows the same as in figure 7, but rotated 90° relative to figure 7,

Fig. 9 shows a detailed view of the lower encircled part of fig. 1, Fig. 10 shows the same as figure 9, but with the parts separate from each other, Fig. l la shows the safety hose similar to figure 1 without a standard coupling, Fig. 1 Ib-I Ig show the main components that interconnects the safety hose when viewed into the run of the hose at different places along the length thereof, Fig. 12 shows a detailed view of the upper and intermediate encircled part of fig. 2, Fig. 13 shows a detailed view of the upper and intermediate encircled part of fig. 2 when the secondary hose is collapsed,

Fig. 14 illustrates a use of the invention between a vessel and a rig, Fig. 15 illustrates a use of the invention between a vessel and a sea bed installation, Fig. 16 shows a safety hose assembly suitable for the use according to fig. 15,

Fig. 17 shows the same situation as in figure 7, but with the parts separate from each other, and

Fig. 18 shows the same as in figure 17, but rotated 90° relative to figure 17.

Reference is firstly made to figure 1 and 2 which in their entirety show a safety hose according to the invention for transportation of mediums between a floating structure and a fixed or floating installation. Fig. 2 shows the same as in figure 1, but is rotated 90° relative to the section of figure 1. The safety hose includes a main hose 1 transporting the medium itself and a secondary hose 2 which is arranged around the main hose 1. A sealing connection is present between the main hose 1 and the secondary hose 2 so that a closed interspace 3 is formed between the hoses 1, 2. In the figure a per se standard coupling assembly 100 is illustrated at the lower end of the hose. Such coupling assembly can be used in both ends for coupling to a coupling point on a vessel, installation or rig. In addition to the coupling assembly, a swivel 40 is included in at least one of the ends of the safety hose. It is to be understood that the safety hose 2 has such a large transversal cross section that the main hose 1 with its coupling parts can be received therein as will be described in detail later.

Fig. 3 and 4 show detailed views of the upper end of the safety hose corresponding to the upper encircled part of fig. 1 and 2. This end includes a swivel 40 with a per se known swivel coupling 44. It will be possible to fill in air via a connection 6 where the air pressure closes a check valve 34 and thus guides the air flow further to a through passage 4 (fig. 12 and 13) and into the hose 16. The swivel coupling 44 of the swivel 40 is fixedly locked by balls 48 to a swivel component 45. The balls 48 are fixedly locked by bolt-against-ball 48 that runs in a bearing lock ring or race 46. The coupling part 44 connects the main hose 1, the intermediate hoses 16 and the secondary hose 2 to the swivel component 45. The main run of the swivel component 45 is installed between the hose system and a delivery or receipt unit for medium. The closed interspace or cavity 3 has communication via the through passage secondary run 47 which extends between two inserts 12, 9. Further, a connection point 14 is present that has a sensor 5 for pressure measurements, sensor 51 for humidity measurements and a sensor 52 for temperature measurements, and a connection point 6 for gas fill in and drainage. This is to be able to determine possible pressure changes, possible humidity, and to be able to fill in and drain the hose system for gas at the swivel 40. It is an aperture 60 for a torque wrench to enable assembly of the safety hose 2. For the understanding of the swivel function itself, the swivel component 45 can be considered as the stationary part, while the coupling part 44 and the part 10 rotate together with the safety hose.

Now with reference to figure 5 and 6, a combined break-away coupling and fluid swivel 20 corresponding to the intermediate encircled part of fig. 1 and 2 is illustrated. Such a combined break-away coupling and fluid swivel 20 can be arranged on at least one location along the longitudinal extension of the safety hose. Also see figure 17 and 18 which clearly illustrates the single parts of the break-away coupling and fluid swivel 20 and where the parts are spaced apart from each other.

The break-away coupling component 25 is kept together by rupture bolts 23 which have a burr or notch in the shaft thereof. The rupture bolts 23 keep two termination flanges against each other and also retains a combined guiding and sealing ring 35. The main run through the break-away coupling component 25 is provided with a damper 21 which is shown in fully open position. The dampers 21 abut each other in open position and are retained by a damper retainer 36 until the termination flanges might separate. Additionally, a valve means 22 is arranged in the secondary run. Valve means 22 are such arranged that they close as soon as said separation occurs and thereby prevents discharge. In order to obtain a swivelling function, a coupling part 24 and 33 with a ball 28 that locks a break-away coupling component 25 and coupling part 24 and 33 together, is included. Thus a swivelling function on both sides of the break-away coupling component 25 is obtained. The balls 28 are locked in place by bolts-to-ball bearing lock 26. The coupling part 24 connects the main hose 1 , the secondary hose 2 and the intermediate hose 16 to the break-away coupling component 25. The closed space or cavity 3 also has communication via through going secondary run in the break-away coupling component 25 through the through passage 27 in the coupling part 33. The closed space 3 also has communication via a pressure relief valve 32 during filling which opens when the air pressure within the space 3 in the lower part is larger than what the spring in the pressure relief valve 32 is able to withstand. Then the valve opens and when the negative pressure in the interspace 3 in the upper part is larger than what the spring of the check valve 32 is able to withstand during draining, the valve opens.

A rupture sensor with a transmitter 30 is integrated into the break-away coupling and fluid swivel 20 in order to alert an operator in case of rupture. The valve dampers 21 and 22 close the main run and secondary run by rupture, and prevent leakage from the break-away spot. One or more through passages with secondary run can be arranged around the main run. For example, four rupture bolts 23 are present that retain the break-away coupling component 25 together, which rupture bolts 23 are designed to break at a predetermined tensional force.

Figure 7 and 8 show a situation when the break-away coupling separates. The valves 22 within the secondary run isolate the interspace 3. The arrows within the main run illustrate what happens when the dampers 21 closes and how the flows are interrupted and shuts off and prevents disastrous flow out to the environments. The rupture sensor 30 is put into action and transmits alarm to the operator.

As it more clearly appears from figure 9 and 10, the main hose 1 and secondary hose 2 are joined by the connecting part 7 that connects a main hose insert 12 with a secondary hose insert 9. Further, the main hose 1 has, as per se known, a sleeve 13 installed thereon. The secondary hose 2 includes a termination coupling 8 and sleeve 9 in a similar way as the main hose 1. The termination coupling 8 of the secondary hose 2 needs to have an inner diameter which provides clearance for the through passage of the main hose 1 with termination coupling insert 12 and sleeve 13 mounted or assembled thereon. An inspection aperture 15 is present in the connecting part 7.

The connecting part 7, which is designed for threading onto the hose insert 12 and the nut 10, results in that the end extension of the secondary hose 2 abuts against the connecting part 7. The threaded portion of the connecting part 7 that engages with the hose insert 12 should be left-handed threads, while the nut 10 has right-handed threads. This is to be able to make up both threaded couplings in one operation. A standard coupling 100 may, as mentioned, be mounted to the hose insert 12, such that communication between the main hose 1 and the standard coupling 100 is formed.

As discussed, a closed interspace 3 exists between the hoses 1 and 2. The space 3 communicates and drains out and fills in via the connection 6 in the swivel 40. The interspace 3 between the main hose 1 and the secondary hose 2 can also in part be filled up with insulating material.

Fig. 11a shows per se the same as in figure 1, omit the standard coupling 100, but have, by means of the figures 1 Ib to 1 Ih, indicated how the safety hose looks like if the hose is severed at the positions 45, 44, 24, 25, 33, 27 and 7 respectively. These figures contribute to the understanding of the description of the remaining figures.

With reference to figures 12 and 13, they illustrate the functions at filling and/or draining of air and/or gas. Figure 12 shows in closer detail the air stream within the hose 16 by means of arrows. The air stream effects inflation of the interspace 3. The air is filled in via the connection 6 that leads further to the through passage 4 and into the hose 16. The check valve 34 closes the through passage 47. This results in that all the air discharges through the filling hose 16 and in through a through passage 31 of a swivel coupling 24 and out into the interspace 3 via through passages 27 of the swivel coupling 33. When the pressure builds up within the interspace 3 in the lower part of the hose, the air will flow out from a pressure relief valve 32 in the swivel coupling 24 and the interspace 3 and the upper part will be filled up. An annulus exists on both sides of the swivel coupling 24 where the heads/nuts of the rupture bolts 23 are located. This creates fluid communication from the hose 16 and into the interspace or cavity 3.

Figure 13 shows in closer detail the air flow through the hose 16 by means of arrows when the interspace 3 is drained. The air is sucked out via the connection 6 that draws the air out of the interspace 3, i.e. simultaneously from both the upper and lower part of the safety hose. This means that that air is sucked out from the lower section via the hose 16 and the upper section through the check valve 34, which by now, under negative pressure, is open.

Generally it can be any type of vessel or installation that is to collect or supply medium, under pressure or vacuum, for transportation. See examples in fig. 14 and 15. One may pull a leaking hose 1 or 2 out from the hose system and replace such with a new one or repair the hose without that other parts need to be replaced.

If a leakage in the main hose 1 under pressure occurs during use, medium that has leaked out from the main hose 1 will be collected by the secondary hose 2, which needs to be designed to be able to withstand full operating pressure, at least in a period that provides possibility for shut down of the hose system. If a leakage in the main hose 1 arises during use under vacuum ("suction"), the secondary hose will be sucked flat and the pressure gauge then will register a pressure change and signalize such to the operator.

Pressure sensors 5, temperature sensors 51 and humidity sensors 52 will provide surveillance or operating personnel with a possibility to register that a leakage is present and to plan to perform an operation shut down and repair. This can take place in a way that reduces possible losses under shut down. In practise the invention provides for a possibility of continued operation for a longer period of time, such that repair can take place in connection with regular service or planned operational shut down. By use of the hose system, in order to achieve maximum floating ability, the hose is filled with gas in the interspace 3. By storage and reeling in of the hose system the gas is drained out by means of e.g. a vacuum pump or ejector, in order to achieve least possible storage space of the hose system.

Figure 16 shows a safety hose system that is suitable to the type of operations that are illustrated in figure 15. Water or liquid is filled in and drained via a connection 61 that leads further into the hose 16 and further into a through passage 31 and out into the interspace 70 in the lower section of the safety hose via the through passage 27. It is a presumption that the interspace 3 is drained for air before water is filled in.

Air or gas is filled in and drained from a connection 62 that leads further into the hose 66 which is arranged to the swivel coupling 24 and fills up an drains the interspace 3 in the upper section of the safety hose via a through passage 63 at the termination of the hose 66 which is arranged on the swivel coupling 24.

The fill in and draining hose 16 is a hose of kink free quality, which means that it is a hose that maintains its configuration even when it is squeezed between the main hose windings when stored on a reel. Basically a kink free hose is designed to prevent kink by the combination "knot and tension", typical for vital supply hoses such as aspiration hoses.

It is to be understood that many types of damper valves can be used together with the break-away coupling 20 in the present invention. The dampers on the main run shown in the figures are by their technical language called "tilting disc valve" and for the secondary run called "poppet disc valve". Some other possible types are: "Split disc valve", "butterfly valve", "plug valve" and "ball valve".

Claims

1.

A safety hose for transportation of a medium between a floating structure and a fixed or floating installation, said safety hose being subjected to dynamic loads, including torque or torsion, which safety hose comprises a main hose (1) transporting said medium, a secondary hose (2) arranged around said main hose (1), a sealing connection between the main hose (1) and the secondary hose (2) to form an interspace (3) therebetween, and a swivel (40) in at least one of the ends of the safety hose, characterized in that a combined break-away coupling and fluid swivel (20) is arranged at least at one location along the longitudinal extension of the safety hose.

2.

The safety hose as defined in claim 1, characterized in that a swivel (40) is arranged at both ends of the safety hose.

3.

The safety hose as defined in claim 1 or 2, characterized in that the break-away coupling (20) includes two fluid swivels, one on each side thereof when viewed in the longitudinal direction.

4.

The safety hose as defined in any of the claims 1-3, characterized in that the hose includes means to introduce air and/or water into said interspace (3).

5.

The safety hose as defined in claim 4, characterized in that said means to introduce air and/or water comprises hoses extending in the longitudinal direction of the safety hose and pass through said combined break-away coupling and fluid swivel (20).

6.

The safety hose as defined in any of the claims 1-5, characterized in that the hose includes at least one of following sensor means: pressure sensor, temperature sensor, humidity sensor and break-away sensor having associated conductors to a control unit.

7.

The safety hose as defined in any of the claims 1-6, characterized in that the breakaway coupling (20) comprises two substantially complementary break-away coupling components (25) that carry respective shut valves and a break-away sensor, where the two substantially complementary break-away coupling components (25) are kept together by a number of rupture bolts (23) that breaks off at predetermined axial load.

8.

The safety hose as defined in any of the claims 1-7, characterized in that each fluid swivel (24) at the break-away coupling (20) is relative rotatable in respect of the breakaway coupling components (25) via friction reducing means, such as balls (28) or similar.

9. The safety hose as defined in any of the claims 1-8, characterized in that each fluid swivel (24) at the break-away coupling (20), alternatively the break-away coupling components (25), has fluid transfer passages for swivel transfer of fluid.

10. The safety hose as defined in any of the claims 1-9, characterized in that the pressure sensor comprises a digital gauge which is designed to provide pressure and pressure changes within the safety hose by a current signal of a value close to real time.

11. The safety hose as defined in any of the claims 1-10, characterized in that the humidity sensor includes a digital gauge which is designed to provide a signal of humidity and temperature within the safety hose of a value close to real time.

12.

The safety hose as defined in any of the claims 1-11, characterized by one connecting point (6) to fill in and drain gas to and from the safety hose.

13.

A safety hose for transportation of a medium between a floating structure and a fixed or floating installation, said safety hose being subjected to dynamic loads, including torque or torsion, which safety hose comprises a main hose (1) transporting said medium, a secondary hose (2) arranged around said main hose (1), a sealing connection between the main hose (1) and the secondary hose (2) to form an interspace (3) therebetween, and a swivel (40) in at least one of the ends of the safety hose, characterized in that the hose includes means to introduce air and/or water into said interspace (3).

14.

The safety hose as defined in claim 13, characterized in that said means to introduce air and/or water comprises hoses extending in the longitudinal direction of the safety hose and pass through said combined break-away coupling and fluid swivel.

15.

The safety hose as defined in one of the claims 13-14, characterized in that at least at one spot along the longitudinal extension of the safety hose a break-away coupling is arranged.

16.

The safety hose as defined in one of the claims 13-14, characterized in that at least at one spot along the longitudinal extension of the safety hose a fluid swivel is arranged.