EP0204761B1 - Improvements in or relating to the protection of pipe means in a splash zone on a rig construction at sea - Google Patents
Improvements in or relating to the protection of pipe means in a splash zone on a rig construction at sea Download PDFInfo
- Publication number
- EP0204761B1 EP0204761B1 EP19850906095 EP85906095A EP0204761B1 EP 0204761 B1 EP0204761 B1 EP 0204761B1 EP 19850906095 EP19850906095 EP 19850906095 EP 85906095 A EP85906095 A EP 85906095A EP 0204761 B1 EP0204761 B1 EP 0204761B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- container
- trunk
- pipe
- carriage
- equipment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000010276 construction Methods 0.000 title claims abstract description 14
- 230000001681 protective effect Effects 0.000 claims abstract description 17
- 238000004140 cleaning Methods 0.000 claims abstract description 11
- 238000007689 inspection Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 3
- 230000000712 assembly Effects 0.000 claims description 2
- 238000000429 assembly Methods 0.000 claims description 2
- 230000001427 coherent effect Effects 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 abstract description 7
- 230000007797 corrosion Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 6
- 238000009434 installation Methods 0.000 abstract description 4
- 230000002093 peripheral effect Effects 0.000 abstract description 4
- 238000007789 sealing Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000012856 packing Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 208000012868 Overgrowth Diseases 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 238000004320 controlled atmosphere Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000003223 protective agent Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000001846 repelling effect Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/002—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables specially adapted for underwater drilling
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B17/0017—Means for protecting offshore constructions
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B17/0034—Maintenance, repair or inspection of offshore constructions
Definitions
- This invention relates to the protection of pipe means in a splash zone on a rig construction or similar installation at sea.
- the so-called splash zone constitutes a particularly exposed region on the rig, the pipes and trunks in the splash zone being particularly exposed to corrosion-promoting and other influences, partially as a consequence of the influences of sea and air and partially as a consequence of the effects of the beating of the waves, attacks of marine overgrowth etc.
- a particular problem arises as a consequence of the often narrow intermediate spaces which are found between pipes and trunks thrust together or adjacent, something which involves large problems for ready access. Hitherto, one has been obliged to effect cleaning, inspection and application of protective medium by means of divers in the regions which are submerged in the sea and, in the regions which are located above or just at sea level, in a more conventional manner by means of personnel placed in scaffolds or at similar work locations.
- the objective is to avoid the afore-mentioned problems by carrying out corrosion protection and other protective attempts in a rational and proper manner, without using divers or personnel received in work domes or boxes.
- the present invention resides in an arrangement for use in the protection of pipe means in a splash zone on a rig construction at sea comprising: (a) a container made up of at least two parts for assembly around said pipe means and having a length which spans both exposed and submerged portions of said pipe means, said container and said pipe means defining therebetween an annular chamber which is closed below and open above and has a breadth which is limited relative to its length, and said container being sealed at its lower end against said pipe means; (b) a first carriage means adapted for movement in said annual chamber around the axis of said pipe means; (c) means for guiding and supporting said first carriage means; (d) a second carriage means guided and supported by said first carriage means and adapted for movement along the latter in a direction axially of said pipe means, said second carriage means comprising holder means for the replaceable mounting of equipment designed for remotely controlled cleaning and inspection of the surface of the pipe means and the application of protective medium thereto; and (e) means enabling operation of said equipment and extending from an upper portion
- the invention also includes a method of using the arrangement of the last preceding paragraph which comprises: (a) assembling the at least two parts of the container around the pipe means;
- the protective work can be carried out on external work platforms or, if necessary, effected and overseen from a position on the deck of the installation.
- a chamber By employing a container of limited breadth, a chamber is available with a relatively low volume in spite of the relatively large length of the chamber. It is then possible to effect cleaning, inspection and application of protective medium in a controlled atmosphere, that is to say under regulatable temperature and regulatable air humidity conditions, the volume in the chamber being able to be exchanged, as required, in a relatively easy manner.
- the chamber of said container may have an open end at its upper end and also at its lower end or only at its lower end. This is a practical solution in case of using the apparatus for removing growth, corrosion material etc. from the pipe or trunk surrounded by said chamber.
- the first and second carriage means constitute a coherent unit comprising two equivalent unit portions arranged one on each opposite side of the container.
- the equivalent unit portions are arranged to bear or thrust against each other at upper and lower positions in the container.
- each equivalent unit portion includes first and second carriage assemblies, said first carriage assembly comprising rigid frame means with an upper set of wheels mounted to run on a roller track at the upper edge of the container and with a lower set of wheels providing lateral supporting abutment against a circularly curved guide rail at the lower end of the container, said frame comprising elongate bracing members between said upper and lower sets of wheels and upper and lower wheel support members for carrying said respective sets of wheels, parallel guide means arranged between said wheel support members as well as parallel to and between said bracing members for separate control of said second carriage assembly which comprises a plate adapted to have the equipment replaceably mounted thereon and to be displaced in relatively close proximity to the inner wall of the container.
- the guide means preferably pass through opposite end portions of the second carriage assembly.
- a vertically extending rig trunk 10 is illustrated in the so-called splash zone, that is to say the rig trunk 10 is shown at 10b submerged below sea level 11 and at 10a above sea level 11.
- the rig trunk 10 is surrounded by a box-forming cylindrical container 12 or case which is provided with an upwardly opening, upper end 13 and a closed, lower end 14.
- the container 12 is carried in a support yoke 15 which is divided into two parts along a vertical plane separately fixable to the rig trunk 10 by means of clamp means 16 at the central portion 17 of the support yoke.
- the container 12 is designed as a two-part construction, that is to say a construction which is divided into two similar half portions 12a and 12b (Fig. 1 and 2) extending axially along dividing lines. Each half portion 12a and 12b can, if desired, be divided up, in addition, into several parts along radially extending dividing lines.
- the container can have, for example, a Jength of 10-13 m.
- the half portions 12a and 12b are mounted one after the other in place on the rig trunk 10, they being suspended from the support yoke 15 and thereafter tightened together against each other and, at the same time, against the rig trunk 10 by means of an upper tightening means 18 and a lower tightening means 19 and preferably one or more intermediate tightening means 20.
- the container may be open in both upper and lower ends thereof. It is most convenient that remotely controlled closing means are located at both upper and lower ends of the container in order to close one or both ends thereof as need may be. This enables the container to have a more flexible application.
- the container may be used for different application in partly or in completely submerged condition with a closed off chamber surrounding the pipe or trunk.
- the container can be used in an efficient manner for specific cleaning applications with an open lower end, allowing the cleaned off material to be discharged directly through the lower end thereof into the surrounding body of sea.
- V-shaped sealing means 21 and V-shaped stop 22 are arranged along longitudinal vertical edges of the half portions 12a, 12b as well as along horizontal, lower edges of the half portions.
- the sealing means 21 and the stops 22 form combined control means and sealing means.
- a bottom portion 23 extends over into a duct profile 24 lying radially innermost which is designed with a semi-circular arcuate contour with the duct opening 24a facing towards the rig trunk 10.
- a packing member 25 which forms a yielding seal against the rig trunk 10.
- the packing member can be securely connected, with a sealing means 21 at the one edge and with a stop 22 at the opposite edge.
- the tightening means 18, 19 and 20 are preferably hydraulically driven, split-up annular tightening means which can be submerged along the container to the respective fastening level by means of hoist lines (not shown), in order to tighten together the container half portions into specific container portions which are locally extra braced.
- Bottom portion 23 of the container half portions extends horizontally inwards towards the duct profile 24.
- the bottom portion 23 and the duct profile 24 are braced relative to each other with a series of triangular plates 26.
- a circularly curved rail 28 Just above the bottom portion 23 at the outer wall of the container, there is fixed, via radially extending support arms 27, a circularly curved rail 28.
- the rail 28 is formed of a plate piece which has the lower portion of the rail 28 arranged at a certain height above the bottom portion 23 and which has the upper portion of the rail 28 projecting a distance upwards above the support arms 27.
- a first carriage 30 is equipped with a pair of upper support wheels 32 and 32 which are rotated about horizontal wheel axes 3a and 32a and which rest against a roller track 33 on the top of the container 12.
- a set of lower support wheels or support rollers 34, 35, 36 which are rotated about vertical roller axes 34a, 35a, 36a respectively thrust against the inside and outside of the rail 28.
- the upper pair of support wheels 32, 32 with an associated support plate 37 is connected, via a pair of rigid control rods 39, 40 to the lower set of support rollers 34, 35, 36 with an associated support plate 38.
- guide-forming means 41, 42 are formed of somewhat elastic means, such as chains or wires or can, for example, be formed of rigid means, such as rigid pipes.
- a second carriage 43 or a slide which by means of a pair of guide sleeves 44, 45 engage with their respective associated guide means 41 and 42.
- the slide of the carriage 43 which in itself has a certain weight or supports special weight elements, is raised and lowered along the guide means 41, 42 via a support wire 46 and a winch 47 fastened to the upper support plate 37 of the carriage 30.
- the carriage 30 moves along the roller track 23 in a suspended condition with control and support along the rail 28 and is forwardly driven in the peripheral direction of the container 12 by means of a drive motor 48 which is fastened to the support plate 37 and which engages with a drive gear wheel 49 (Fig. 11) with a gear wheel rim 50 just below the roller track 33 at the upper end of the container 12.
- each carriage 30 is equipped with an associated slide or carriage 43 and with an associated winch 47 and drive motor 48.
- Each carriage unit 30, 43 can, during mountings of the container half portions 12a and 12b on the rig trunk, already be mounted in place on the associated container half portion in certain accurately established positions in the container half portions.
- cooperating support means 52, 53 on the carriage units can jointly thrust against each other for mutual repelling and controlling of the carriage units relative to each other in the peripheral direction of the container.
- the carriage units 30, 43 are adapted to move backwards and forwards over curved lengths each of about 180° (for example, approximately 190°) so that the carriage units collectively can cover the whole periphery of the rig trunk.
- the carriage units can collectively cover the rig trunk over the whole vertical dimension of the container.
- a fastening plate 43a On the slide or the carriage 43, there are fastenable on a fastening plate 43a, via associated fastening means 54, different types of the treating apparatus and control apparatuses, for example, cleaning equipment in the form of a sand blast nozzle or the like, control equipment in the form of TV camera or similar visual aid means including headlight or similar illuminating means and equipment for the application of protective medium, for example, in the form of paint roller with associated nozzle for the supply of protective medium to the paint roller or, if desired, directly to the surface which is to be supplied with protective agent.
- Said treatment apparatuses or control apparatuses can be mounted and used after the other as required.
- the carriage units 30, 43 After the container is emptied of water (draining by means of suction conduit and associated pump) and necessary equipment is mounted on the support plate 43a, provision is made for the carriage units 30, 43 to be operated by remote control either from the platform 51 or from a control room on the deck of the rig.
- To the carriage 30, that is to say parallel to the control rods 39, 40 there can be fastened associated electrical leads or medium hoses or pipes for the supply of different media to the equipment on the slide or the carriage 43.
- the control rods 39,40 can themselves form medium supply pipes between the bottom of the container and the top.
- This suction pipe or this suction hose can be used alternatively for the removal of water from internal chambers of the container just after the mutual jointing of the two container half portions 12a, 12b and for the removal of cleaning medium (sand particles or the like) and detached coating particles, excess corrosion protective medium or the like.
- cleaning medium sand particles or the like
- a suitable hose or a suitable pipe for the supply of hot (preferably also dry) air or gas to the bottom portion of the container for heating and drying untreated and treated surfaces of the rig trunk in order to obtain a desired air humidity and a desired air temperature in internal chambers of the container 12.
- the objective is to effect a treatment and a visual control together with applying corrosion protective medium or another protective medium on dried portions of a rig trunk or similar construction parts in a simple and risk-free manner by remote control and with minimum demands on space.
- the container 12 provision is made for the container 12 to be designed with an internal chamber of relatively small volume, but nevertheless with an effective utilisation of the limited volume of the chamber.
- guide sleeves and associates guide means of the slide or carriage are arranged laterally displaced relative to the intermediate fastening plate 43a while the control rods 39, 40 are further displaced sideways away from the slide of the carriage 43 but, nevertheless, not further away than that the control rods 39, 40 can, if necessary, form stops for guide sleeves of the slide or the carriage 43 or other suitable support means during displacement of the slide or the carriage along the guide means 41, 42.
- the said limited volume within the internal chamber of the container involves the advantage that the volume is relatively easy to empty and fill and in addition is easy to control in connection with airing so as to provide drier treatment surfaces and humidity-regulatable or temperature-regulatable atmosphere in a ready manner, the chamber being able to be blown through by air or gas which is supplied to the lower end of the chamber or which can be sucked through by sucking in air or gas from the lower end of the chamber. Simultaneously with the afore-mentioned air or gas exchange, there can be obtained, as a consequence of the narrow passage in the container, an effective flow along the outer surface of the rig trunk.
- the solution in connection with the treatment and control of the rig trunk for application of corrosion protective medium can also be employed for application of another protective medium which is to be applied outside the treated surface of the rig trunk.
- the container can, for example, be used with advantage in connection with the application of a layer of rubber or a similar protective layer outside the rig trunk.
- a coating can be applied in sections of plate material around the rig trunk with a vertical joint in each section and with a horizontal joint between each pair of sections, to form a freely sitting stocking which can slide downwards along the rig trunk gradually as subsequent sections are jointed on.
- the stocking can, if necessary, be carried below by the carriage units 30, 43 via suitable support equipment on the fastening plate 43a.
- the stocking can be supported independently of the carriage units 30, 43 via suitable support equipment (not shown) while the carriage units can be equipped for the application of or jointing together of the plate-formed coating.
- suitable filler material such as a fluid medium of two or several components which on hardening expands to a certain limited extent.
- the inner wall of the container 12 can be arranged at a distance from the outer wall of the pipe trunk of 15 cm since such a distance can be sufficient to receive the above- described equipment. At the same time, such a limited distance will give a minimal volume in the container and the container will be able to be easily arranged at locations which otherwise can be accessible with difficulty with other equipment.
- a support and guide device 60 for the carriage 30 is fixed, independently of the container, directly to the pipe or trunk 10.
- the support and guide device is made in the form of two half portions 60a, 60b which are clamped together against each other around the pipe or trunk 10 by means of clamp bolts 61, 62 in opposite bracket portions 63, 64 of the two half portions 60a, 60b.
- a lower support for the carriage 30 on a guide at the bottom of the container there can be employed, in a manner corresponding to that shown in Fig. 2, a lower support for the carriage 30 on a guide at the bottom of the container.
- a lower support (not shown) fixed directly to the pipe or trunk independent of the container.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Cleaning In General (AREA)
- Earth Drilling (AREA)
- Coating Apparatus (AREA)
- Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
- Electrophonic Musical Instruments (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
Abstract
Description
- This invention relates to the protection of pipe means in a splash zone on a rig construction or similar installation at sea.
- In rig constructions or other installations at sea, the so-called splash zone constitutes a particularly exposed region on the rig, the pipes and trunks in the splash zone being particularly exposed to corrosion-promoting and other influences, partially as a consequence of the influences of sea and air and partially as a consequence of the effects of the beating of the waves, attacks of marine overgrowth etc. A particular problem arises as a consequence of the often narrow intermediate spaces which are found between pipes and trunks thrust together or adjacent, something which involves large problems for ready access. Hitherto, one has been obliged to effect cleaning, inspection and application of protective medium by means of divers in the regions which are submerged in the sea and, in the regions which are located above or just at sea level, in a more conventional manner by means of personnel placed in scaffolds or at similar work locations. Work domes or boxes have also been employed in which work personnel are received in a chamber which borders up to the pipe or the trunk. Such pc'sonnel- receiving work domes or boxes are, on the other hand, difficult to employ in the regions where the associated trunk thrusts tightly up to other construction members of the rig. In addition, such boxes can be difficult to complete to provide totally suitable work zones for personnel.
- From GB-A-2114636 an arrangement according to the first part of claim 1 is known including a two-part container for inspection, maintenance and corrosion protection by personnel. However there is no indication of particularly adapted means for effecting such work.
- With the present invention, the objective is to avoid the afore-mentioned problems by carrying out corrosion protection and other protective attempts in a rational and proper manner, without using divers or personnel received in work domes or boxes.
- Accordingly, the present invention resides in an arrangement for use in the protection of pipe means in a splash zone on a rig construction at sea comprising: (a) a container made up of at least two parts for assembly around said pipe means and having a length which spans both exposed and submerged portions of said pipe means, said container and said pipe means defining therebetween an annular chamber which is closed below and open above and has a breadth which is limited relative to its length, and said container being sealed at its lower end against said pipe means; (b) a first carriage means adapted for movement in said annual chamber around the axis of said pipe means; (c) means for guiding and supporting said first carriage means; (d) a second carriage means guided and supported by said first carriage means and adapted for movement along the latter in a direction axially of said pipe means, said second carriage means comprising holder means for the replaceable mounting of equipment designed for remotely controlled cleaning and inspection of the surface of the pipe means and the application of protective medium thereto; and (e) means enabling operation of said equipment and extending from an upper portion to a lower portion of said annular chamber.
- The invention also includes a method of using the arrangement of the last preceding paragraph which comprises: (a) assembling the at least two parts of the container around the pipe means;
- Another arrangement for protection of the submerged part of ships including rotating brushes movable along the hull is known from DE-B-2325223. This arrangement is not suitable for protection work in the splash zone on a rig construction. (b) draining the annular chamber defined between the container and said pipe means; and (c) actuating the first and second carriage means to move the first carriage means around the pipe means and to move the second carriage means axially of the latter while simultaneously actuating the equipment replaceably mounted on the holder means of the second carriage means via the operation-enabling means for said equipment.
- By a) employing a container chamber with a strongly limited breadth dimension, b) effecting cleaning, inspection and application of protective medium by remote control and c) employing a carriage device which is moveable in the axial direction and peripheral direction of the chamber to support necessary equipment, it has been made possible to effect the protection with a minimal need for space and in a manner involving little danger and, at the same time, with the possibility for effective control of the protective work. If desired, the protective work can be carried out on external work platforms or, if necessary, effected and overseen from a position on the deck of the installation.
- By employing a container of limited breadth, a chamber is available with a relatively low volume in spite of the relatively large length of the chamber. It is then possible to effect cleaning, inspection and application of protective medium in a controlled atmosphere, that is to say under regulatable temperature and regulatable air humidity conditions, the volume in the chamber being able to be exchanged, as required, in a relatively easy manner.
- Alternatively, the chamber of said container may have an open end at its upper end and also at its lower end or only at its lower end. This is a practical solution in case of using the apparatus for removing growth, corrosion material etc. from the pipe or trunk surrounded by said chamber. In addition, it is also possible to use a chamber with closed upper and lower ends in order to use the apparatus in completely submerged condition.
- In order to achieve a relatively rapid and effective cleaning, inspection and application of protective medium, it is preferred that the first and second carriage means constitute a coherent unit comprising two equivalent unit portions arranged one on each opposite side of the container. Desirably, the equivalent unit portions are arranged to bear or thrust against each other at upper and lower positions in the container. From a pure construction point of view, it is preferred that each equivalent unit portion includes first and second carriage assemblies, said first carriage assembly comprising rigid frame means with an upper set of wheels mounted to run on a roller track at the upper edge of the container and with a lower set of wheels providing lateral supporting abutment against a circularly curved guide rail at the lower end of the container, said frame comprising elongate bracing members between said upper and lower sets of wheels and upper and lower wheel support members for carrying said respective sets of wheels, parallel guide means arranged between said wheel support members as well as parallel to and between said bracing members for separate control of said second carriage assembly which comprises a plate adapted to have the equipment replaceably mounted thereon and to be displaced in relatively close proximity to the inner wall of the container.
- The guide means preferably pass through opposite end portions of the second carriage assembly.
- In order that the invention can be more clearly understood, convenient embodiments thereof will now be described by way of example, with reference to the accompanying drawings in which:
- Fig. 1 is a side view of an arrangement in use on a rig trunk and seen from the side,
- Fig. 2 is a vertical section of a container and associated carriage means,
- Fig. 3 is a horizontal section of the arrangement of Fig. 2,
- Fig. 4 is a perspective view at the upper end of the container illustrating an alternative form of fastening for the arrangement, and
- Fig. 5 is a plan of the fastening of Fig. 4.
- Referring to Fig. 1, a vertically extending
rig trunk 10 is illustrated in the so-called splash zone, that is to say therig trunk 10 is shown at 10b submerged belowsea level 11 and at 10a abovesea level 11. In this region, therig trunk 10 is surrounded by a box-formingcylindrical container 12 or case which is provided with an upwardly opening,upper end 13 and a closed, lower end 14. Thecontainer 12 is carried in asupport yoke 15 which is divided into two parts along a vertical plane separately fixable to therig trunk 10 by means of clamp means 16 at thecentral portion 17 of the support yoke. - The
container 12 is designed as a two-part construction, that is to say a construction which is divided into two similarhalf portions half portion - During assembly, the
half portions rig trunk 10, they being suspended from thesupport yoke 15 and thereafter tightened together against each other and, at the same time, against therig trunk 10 by means of an upper tightening means 18 and a lower tightening means 19 and preferably one or more intermediate tightening means 20. - In an alternative embodiment (now shown) the container may be open in both upper and lower ends thereof. It is most convenient that remotely controlled closing means are located at both upper and lower ends of the container in order to close one or both ends thereof as need may be. This enables the container to have a more flexible application. In other words, the container may be used for different application in partly or in completely submerged condition with a closed off chamber surrounding the pipe or trunk. In addition, the container can be used in an efficient manner for specific cleaning applications with an open lower end, allowing the cleaned off material to be discharged directly through the lower end thereof into the surrounding body of sea.
- As shown in Fig. 3, the
half portions stop 22. This arrangement of V-shaped sealing means and V-shaped stop is arranged along longitudinal vertical edges of thehalf portions stops 22 form combined control means and sealing means. - At lower ends of the
half portions bottom portion 23 extends over into aduct profile 24 lying radially innermost which is designed with a semi-circular arcuate contour with the duct opening 24a facing towards therig trunk 10. Inside the opening 24a of theduct profile 24, there is received apacking member 25 which forms a yielding seal against therig trunk 10. At the ends, the packing member can be securely connected, with a sealing means 21 at the one edge and with astop 22 at the opposite edge. - The tightening means 18, 19 and 20 are preferably hydraulically driven, split-up annular tightening means which can be submerged along the container to the respective fastening level by means of hoist lines (not shown), in order to tighten together the container half portions into specific container portions which are locally extra braced.
-
Bottom portion 23 of the container half portions extends horizontally inwards towards theduct profile 24. Thebottom portion 23 and theduct profile 24 are braced relative to each other with a series oftriangular plates 26. Just above thebottom portion 23 at the outer wall of the container, there is fixed, via radially extendingsupport arms 27, a circularlycurved rail 28. Therail 28 is formed of a plate piece which has the lower portion of therail 28 arranged at a certain height above thebottom portion 23 and which has the upper portion of therail 28 projecting a distance upwards above thesupport arms 27. - A
first carriage 30 is equipped with a pair ofupper support wheels horizontal wheel axes 3a and 32a and which rest against aroller track 33 on the top of thecontainer 12. A set of lower support wheels orsupport rollers vertical roller axes rail 28. The upper pair ofsupport wheels support plate 37 is connected, via a pair ofrigid control rods support rollers support plate 38. In an intermediate space between thesupport plates control rods support plates - On the guide means, 41, 42, there are slidably mounted a
second carriage 43 or a slide which by means of a pair ofguide sleeves carriage 43, which in itself has a certain weight or supports special weight elements, is raised and lowered along the guide means 41, 42 via a support wire 46 and a winch 47 fastened to theupper support plate 37 of thecarriage 30. Thecarriage 30 moves along theroller track 23 in a suspended condition with control and support along therail 28 and is forwardly driven in the peripheral direction of thecontainer 12 by means of adrive motor 48 which is fastened to thesupport plate 37 and which engages with a drive gear wheel 49 (Fig. 11) with agear wheel rim 50 just below theroller track 33 at the upper end of thecontainer 12. - From the deck of the rig there are suspended two segregated
work platforms 51, that is to say one for each containerhalf portion - In the illustrated embodiment (see Fig. 3), there is shown, on each of the container
half portions corresponding carriage 30. Eachcarriage 30 is equipped with an associated slide orcarriage 43 and with an associated winch 47 and drivemotor 48. Eachcarriage unit container half portions carriage units moveable carriage 43, the carriage units can collectively cover the rig trunk over the whole vertical dimension of the container. On the slide or thecarriage 43, there are fastenable on afastening plate 43a, via associated fastening means 54, different types of the treating apparatus and control apparatuses, for example, cleaning equipment in the form of a sand blast nozzle or the like, control equipment in the form of TV camera or similar visual aid means including headlight or similar illuminating means and equipment for the application of protective medium, for example, in the form of paint roller with associated nozzle for the supply of protective medium to the paint roller or, if desired, directly to the surface which is to be supplied with protective agent. Said treatment apparatuses or control apparatuses can be mounted and used after the other as required. - After the container is emptied of water (draining by means of suction conduit and associated pump) and necessary equipment is mounted on the
support plate 43a, provision is made for thecarriage units platform 51 or from a control room on the deck of the rig. To thecarriage 30, that is to say parallel to thecontrol rods carriage 43. If desired, thecontrol rods bottom portion 23 of thecontainer 12. This suction pipe or this suction hose can be used alternatively for the removal of water from internal chambers of the container just after the mutual jointing of the twocontainer half portions container 12. - With the present invention, the objective is to effect a treatment and a visual control together with applying corrosion protective medium or another protective medium on dried portions of a rig trunk or similar construction parts in a simple and risk-free manner by remote control and with minimum demands on space. In this connection, provision is made for the
container 12 to be designed with an internal chamber of relatively small volume, but nevertheless with an effective utilisation of the limited volume of the chamber. Provision is made for thefastening plate 43a of the slide orcarriage 43 for the mounting of appropriate equipment, to be arranged as tightly as possible up to the inner wall of thecontainer 12 without necessarily contacting this so that the greatest possible space can be obtained for said treatment equipment and control equipment. In this connection, guide sleeves and associates guide means of the slide or carriage are arranged laterally displaced relative to theintermediate fastening plate 43a while thecontrol rods carriage 43 but, nevertheless, not further away than that thecontrol rods carriage 43 or other suitable support means during displacement of the slide or the carriage along the guide means 41, 42. - The said limited volume within the internal chamber of the container involves the advantage that the volume is relatively easy to empty and fill and in addition is easy to control in connection with airing so as to provide drier treatment surfaces and humidity-regulatable or temperature-regulatable atmosphere in a ready manner, the chamber being able to be blown through by air or gas which is supplied to the lower end of the chamber or which can be sucked through by sucking in air or gas from the lower end of the chamber. Simultaneously with the afore-mentioned air or gas exchange, there can be obtained, as a consequence of the narrow passage in the container, an effective flow along the outer surface of the rig trunk.
- In the present embodiment, there is illustrated the solution in connection with the treatment and control of the rig trunk for application of corrosion protective medium. However, the solution can also be employed for application of another protective medium which is to be applied outside the treated surface of the rig trunk. The container can, for example, be used with advantage in connection with the application of a layer of rubber or a similar protective layer outside the rig trunk. For example, such a coating can be applied in sections of plate material around the rig trunk with a vertical joint in each section and with a horizontal joint between each pair of sections, to form a freely sitting stocking which can slide downwards along the rig trunk gradually as subsequent sections are jointed on. The stocking can, if necessary, be carried below by the
carriage units fastening plate 43a. Alternatively, the stocking can be supported independently of thecarriage units - As an example, the inner wall of the
container 12 can be arranged at a distance from the outer wall of the pipe trunk of 15 cm since such a distance can be sufficient to receive the above- described equipment. At the same time, such a limited distance will give a minimal volume in the container and the container will be able to be easily arranged at locations which otherwise can be accessible with difficulty with other equipment. - In Figs. 4 and 5, there is illustrated an alternative embodiment where a support and guide
device 60 for thecarriage 30 is fixed, independently of the container, directly to the pipe ortrunk 10. The support and guide device is made in the form of two half portions 60a, 60b which are clamped together against each other around the pipe ortrunk 10 by means ofclamp bolts opposite bracket portions - By the solution shown there is the possibility of supporting the
carriage 30 in an accurate manner without vibrations and movements which otherwise can exert pressure on the container during use as a consequence of the impact of waves against the container. In addition, by arranging thecarriage 30 at a level above the upper edge of the container there results, furthermore, an easily available access to the second carriage and equipment which is mounted on the latter. - With the construction illustrated in Figs. 4 and 5, there can be employed, in a manner corresponding to that shown in Fig. 2, a lower support for the
carriage 30 on a guide at the bottom of the container. Alternatively, there can be utilised a lower support (not shown) fixed directly to the pipe or trunk independent of the container.
Claims (9)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT85906095T ATE33598T1 (en) | 1984-12-10 | 1985-12-09 | IMPROVEMENTS TO PROTECT A PIPE IN THE SUPPLY ZONE DURING CONSTRUCTION OF AN SEA DRILLING PLATFORM. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO844923 | 1984-12-10 | ||
NO844923A NO155658C (en) | 1984-12-10 | 1984-12-10 | PROCEDURE FOR PROTECTING PUTS AND ADD A GASPING AREA ON A RIGGING CONSTRUCTION AND DEVICE FOR IMPLEMENTING THE PROCEDURE. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0204761A1 EP0204761A1 (en) | 1986-12-17 |
EP0204761B1 true EP0204761B1 (en) | 1988-04-20 |
Family
ID=19887977
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19850906095 Expired EP0204761B1 (en) | 1984-12-10 | 1985-12-09 | Improvements in or relating to the protection of pipe means in a splash zone on a rig construction at sea |
Country Status (10)
Country | Link |
---|---|
EP (1) | EP0204761B1 (en) |
AU (1) | AU581720B2 (en) |
BR (1) | BR8507105A (en) |
DE (1) | DE3562206D1 (en) |
DK (1) | DK158292C (en) |
GB (1) | GB2180908B (en) |
IN (1) | IN167717B (en) |
MX (1) | MX162407A (en) |
NO (1) | NO155658C (en) |
WO (1) | WO1986003468A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0358682B1 (en) * | 1987-05-15 | 1995-08-23 | Iev International Pty. Limited | Apparatus for the combatting of marine growth on offshore structures |
GB2247295B (en) * | 1990-08-20 | 1994-03-09 | British Gas Plc | Method and apparatus for positioning components |
CA2057096C (en) * | 1991-12-05 | 1996-09-17 | Alan Cameron Kirby | Shrink wrap system |
NL2011779C2 (en) * | 2013-11-11 | 2015-05-13 | Boskalis Offshore Subsea Services Europ B V | METHOD FOR TREATING A POLE AND METHOD FOR IT. |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2357144A (en) * | 1942-03-16 | 1944-08-29 | Carlyle B Stair | Surface treating apparatus for poles |
DE2325223C2 (en) * | 1973-05-18 | 1975-06-12 | Flender Werft Ag, 2400 Luebeck | Floating device with rotating brushes for cleaning the outer skin of floating bodies lying in the water, preferably ships |
US4038942A (en) * | 1976-08-04 | 1977-08-02 | Commercial Resins Company | System for spraying a powder circumferentially around a pipe |
NO146053B (en) * | 1980-09-19 | 1982-04-13 | Harald Andersen Wallevik | WORK ROOMS FOR USE BY UNDERWORK. |
-
1984
- 1984-12-10 NO NO844923A patent/NO155658C/en unknown
-
1985
- 1985-12-09 GB GB8619289A patent/GB2180908B/en not_active Expired
- 1985-12-09 WO PCT/NO1985/000079 patent/WO1986003468A1/en active IP Right Grant
- 1985-12-09 DE DE8585906095T patent/DE3562206D1/en not_active Expired
- 1985-12-09 AU AU52031/86A patent/AU581720B2/en not_active Ceased
- 1985-12-09 BR BR8507105A patent/BR8507105A/en not_active IP Right Cessation
- 1985-12-09 EP EP19850906095 patent/EP0204761B1/en not_active Expired
- 1985-12-10 MX MX87785A patent/MX162407A/en unknown
-
1986
- 1986-06-16 IN IN465/MAS/86A patent/IN167717B/en unknown
- 1986-08-08 DK DK381086A patent/DK158292C/en active
Also Published As
Publication number | Publication date |
---|---|
DK381086A (en) | 1986-08-08 |
DK158292C (en) | 1990-11-12 |
NO844923L (en) | 1986-06-11 |
DE3562206D1 (en) | 1988-05-26 |
GB8619289D0 (en) | 1986-09-17 |
BR8507105A (en) | 1987-03-31 |
DK381086D0 (en) | 1986-08-08 |
MX162407A (en) | 1991-05-07 |
AU581720B2 (en) | 1989-03-02 |
GB2180908A (en) | 1987-04-08 |
DK158292B (en) | 1990-04-30 |
NO155658B (en) | 1987-01-26 |
IN167717B (en) | 1990-12-08 |
AU5203186A (en) | 1986-07-01 |
WO1986003468A1 (en) | 1986-06-19 |
NO155658C (en) | 1987-05-06 |
GB2180908B (en) | 1989-05-10 |
EP0204761A1 (en) | 1986-12-17 |
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