DK176803B1

DK176803B1 - System for establishing connection of pressure pipes in steel

Info

Publication number: DK176803B1
Application number: DK200300965A
Authority: DK
Inventors: Nils Fog Gjersoee
Original assignee: Nils Fog Gjersoee; Hansen Niels Erik Ottosen
Priority date: 2003-06-27
Filing date: 2003-06-27
Publication date: 2009-09-21
Also published as: DK200300965A

Description

DK 176803 B1DK 176803 B1

Benavnølse:Benavnølse:

System for etablering af muffesamling på trykrør i stål.System for establishing sleeve assembly on pressure pipes in steel.

Opfindelsens Anvendelsesområde: 5 Opfindelsen angår en muffesamling for trykrør i stål. Mekanismen er af den art, hvor en fri ende af trykrøret forsynes med et endestykke, hvorved der etableres en tryktæt muffesamling. Endestykket kan i den frie ende være forsynet med en vilkårlig sammenkoblingsmekanisme, som derefter kan 10 anvendes for at etablere en samling til en modpart af stålrøret.Field of the Invention: This invention relates to a sleeve assembly for steel pressure pipes. The mechanism is of the kind where a free end of the pressure tube is provided with an end piece, thereby establishing a pressure-tight socket joint. The end piece may at the free end be provided with any coupling mechanism which can then be used to establish an assembly for a counterpart of the steel pipe.

Standpunkt:View:

Opfindelsen angår systemet for etablering af samlingen, 15 herunder den kombination og rækkefølge af eksisterende og nye virkemidler og værktøjer, som anvendes i processen for at etablere samlingen.The invention relates to the system for establishing the collection, including the combination and order of existing and new means and tools used in the process of establishing the collection.

Systemet anvendes for at muliggøre samlinger mellem frie 20 rørender for rørledninger beliggende på havbunden. Idag findes der kun ganske få systemer, som kan anvendes til denne opgave, som typisk opstår i forbindelse med reparation af en rørledning som følge af korrosion eller fysisk beskadigelse.The system is used to enable joints between free 20 pipe ends for pipelines located on the seabed. Today, there are very few systems that can be used for this task, which typically occur in connection with a pipeline repair due to corrosion or physical damage.

25 Opfindelsen adskiller sig fra kendte teknikker som beskrevet i US Patent 4,608,739 Al, EP 0802002 Al og US patent 4,388,752A1, på følgende måder: 1The invention differs from known techniques as disclosed in US Patent 4,608,739 A1, EP 0802002 A1 and US Patent 4,388,752 A1, in the following ways: 1

Efter radial expansion og plastisk deformation af den 30 indre rørvæg foretages en axial samraenspænding, hvorved de skærende anlægsflader i den bageste muffedel deformerer rørvæggen og der opnåes yderligere forsegling.After radial expansion and plastic deformation of the inner tube wall, an axial co-tension is made, whereby the intersecting abutments in the rear socket portion deform the tube wall and further sealing is achieved.

DK 176803 B1 • Der anvendes en permanent indvendig konisk dorn, som under den axiale sammenspænding indgår som foringselement for røret, og desuden danner en ny røroverflade, hvorved den endelige samling opnår en indre diameter som det 5 oprindelige rør.GB 176803 B1 • A permanent internal tapered mandrel is used which, under the axial tension, is used as the casing element for the pipe, and in addition forms a new pipe surface, whereby the final joint achieves an inner diameter as the original pipe.

Ved opfindelsen opnås:The invention provides:

Ved opfindelsen opnås, at det via et antal eksisterende og nye virkemidler samt ved brug af en kontrolleret og veldefineret 10 fremgangsmåde er muligt at forsyne en fri rørende af en rørledning, beliggende på havbunden, med en sammenkoblingsmekanisme for en modpart til trykrøret.The invention achieves that it is possible, through a number of existing and new means, and by using a controlled and well-defined method, to provide a free pipe of a pipeline, situated on the seabed, with a coupling mechanism for a counterpart to the pressure pipe.

Midler: 15 Dette opnås ifølge opfindelsen ved brug af en midlertidig friktionsspændeanordning, placeret bagest på trykrøret, en støtte- og forseglingsring samt to sammenspændte muffedele, som føres ind over den frie rørende. Den bageste muffedels indre flader er forsynet med koncentrisk placerede skærende 20 tænder. Endvidere anvendes et hydraulisk ekspansionsværktøj (swaging tool), som indføres i røret fra den frie ende. Der anvendes endvidere en roterende skæremaskine, midlertidigt monteret på den bageste af muffedelene. Der anvendes desuden en konisk dorn med cylindrisk udboring som svarer til den 25 indre diameter i trykrøret. Dornen udgør sammen med den bageste muffedel de primære dele af endestykket.Means: This is achieved according to the invention by using a temporary frictional tensioning device, located at the rear of the pressure tube, a support and sealing ring and two clamped sleeve parts which are inserted over the free tube. The inner surfaces of the rear sleeve part are provided with concentrically placed cutting teeth. Furthermore, a hydraulic expansion tool (swaging tool) is used which is introduced into the pipe from the free end. In addition, a rotary cutting machine is used, temporarily mounted on the rear of the socket parts. In addition, a conical mandrel with a cylindrical bore corresponding to the inner diameter of the pressure pipe is used. The mandrel, together with the rear socket member, constitutes the primary parts of the end piece.

For at etablere samlingen anvendes kraftige langsgående bolte samt værktøj for sammentrækning af flanger (flange 30 tensioners).To establish the joint, use strong longitudinal bolts as well as tools for flange contraction (flange 30 tensioners).

DK 176803 B1DK 176803 B1

Virkemåde:Function:

Systemet anvendes på en fri rørende på følgende måde: En friktionsspændeanordning monteres på røret for at danne et modholdspunkt som anvendes under etablering af samlingen for 5 at optage kræfter i rørets axiale retning. Støtte- og forseglingsringen føres løst over røret og placeres i nærheden af friktionsspændeanordningen for senere anvendelse. Herefter føres de to sammenspændte muffedele henholdsvist benævnte bageste og forreste muffedel ind over røret og låses i den 10 ønskede position til friktionsspændeanordningen ved brug af et styr. Herefter indføres et hydraulisk ekspansionsværktøj (swaging tool) i den frie rørende og positioneres således, at forseglingsfladerne er placeret udfor muffedelenes tilsvarende kontaktflader. Swaging operationen udføres, hvorved trykrøret 15 deformeres plastisk i radial retning indtil der opnås anlæg mod muffedelenes anlægsflader og skærende tænder. Swaging værktøjet de-aktiveres og fjernes fra røret. Muffedelenes langsgående bolte løsnes og den forreste halvdel fjernes fra røret. Der monteres nu en roterende skæremaskine på den 20 bageste muffedel. Røret skæres af i den ønskede afstand fra den bageste muffedel og skæremaskinen fjernes. Herefter indføres den koniske dorn, hvis koniske yderside danner samlingens og dermed endestykkets anlægsflader mod rørets ekspanderede indvendige side. Dornen forbindes med 25 flangetrækkere eller tilsvarende trækkeudstyr til friktionsspændeanordningen og trækkes på plads i røret således, at der opnås kontakt mellem rørets afskårne endeflade og dornens modsvarende anlægsflade. Flangetrækkerne fjernes og styrforbindelsen mellem den bageste muffehalvdel og friktions-30 spændeanordningen frigøres, og de langsgående kraftige bolte monteres. Sammenspænding foretages nu med hydraulisk sammenspændingsudstyr (boltetrækkere), hvorved den bageste muffehalvdels skærende tænder bringes yderligere i indgreb med DK 176803 B1 den ydre rørvæg og der etableres flere uafhængige forseglinger af trykrøret. De ydre anlægsflader mellem bageste muffedel og dorn kan være forsynet med tætningsringe eller andre mekanismer til forsegling af disse flader (ikke vist på 5 figurer). Efter sammenspænding monteres støtte- og forseglingsringen ved indkiling mellem bageste muffedel og rørvæggen, idet der her anvendes flytbare donkrafte med modhold mod friktionsspændeanordningen. Til sidst fjernes friktions-spændeanordningen. Herved er endestykket monteret.The system is applied to a free tube in the following way: A friction clamp is mounted on the tube to form a retention point which is used during the establishment of the joint to absorb forces in the axial direction of the tube. The support and sealing ring are loosely passed over the pipe and placed near the friction clamping device for later use. Thereafter, the two clamped sleeve members are respectively referred to as the rear and front sleeve members over the tube and locked in the desired position to the friction clamping device using a guide. Then, a hydraulic expansion tool (swaging tool) is introduced into the free tube and positioned so that the sealing faces are positioned next to the corresponding contact surfaces of the sleeve members. The swaging operation is performed whereby the pressure tube 15 is plastically deformed in the radial direction until abutment is obtained against the abutment surfaces and cutting teeth. The swaging tool is deactivated and removed from the tube. The longitudinal bolts of the sleeve parts are loosened and the front half removed from the pipe. A rotary cutting machine is now mounted on the 20 rear socket part. Cut the pipe at the desired distance from the rear socket and remove the cutting machine. Next, the tapered mandrel is inserted, whose tapered exterior forms the abutment surfaces of the joint and thus the end piece against the expanded inner side of the tube. The mandrel is connected with 25 flange pullers or similar pulling equipment to the friction clamping device and is pulled into place in the tube so that contact is made between the cut end surface of the tube and the corresponding abutment surface of the mandrel. The flange pullers are removed and the guide connection between the rear sleeve half and the friction clamping device is released and the longitudinally tight bolts are mounted. Clamping is now carried out with hydraulic clamping equipment (bolt pullers), whereby the cutting teeth of the rear sleeve half are further engaged with DK 176803 B1 the outer pipe wall and several independent seals of the pressure pipe are established. The outer abutment surfaces between the rear socket member and mandrel may be provided with sealing rings or other mechanisms for sealing these surfaces (not shown in 5 figures). After clamping, the support and sealing ring is mounted at the wedge between the rear socket member and the pipe wall, using movable jacks here with restraint against the friction clamping device. Finally, the friction clamping device is removed. Hereby the end piece is mounted.

1010

Figurer:Figures:

Opfindelsen forklares i det følgende under henvisning til tegningerne.The invention is explained below with reference to the drawings.

15 Figur 0:Figure 0:

Principtegning, som viser systemets enkeltdele samt de enkelte trin for etablering af samlingen.Principle drawing showing the individual parts of the system as well as the individual steps for establishing the assembly.

Figur 1-6 viser et mere detaljeret eksempel hvor mulige 20 udformninger er vist for nogle af systemets enkeltdele.Figures 1-6 show a more detailed example where possible designs are shown for some of the individual parts of the system.

Figur 1:Figure 1:

Friktionsspændeanordning, støtte- og forseglingsring, bageste og forreste muffedel monteret, og låst til friktions-25 spændeanordningen. Låsnings- og friktionsspændeanordning er vist i princip. Swaging værktøjet indført.Friction clamping device, support and sealing ring, rear and front socket member mounted, and locked to friction clamping device. Locking and friction clamping devices are shown in principle. The swaging tool introduced.

Φ Trykrør med fri ende (D Bageste muffedel 30 ® Forreste muffedel ® Kraftige langsgående bolte DK 176803 B1 © Friktionsspændeanordning med styr, boltesamlinger for etablering af friktion ikke vist © Hydraulisk ekspansionsværktøj (swaging tool), hvormed der etableres et indre hydraulisk overtryk i røret i 5 området mellem værktøjets forseglinger mod rørvæggen ® Støtte- og forseglingsringΦ Pressure pipe with free end (D Rear socket member 30 ® Front socket member ® Powerful longitudinal bolts DK 176803 B1 © Friction clamping device with handle, bolt joints for establishing friction not shown © Hydraulic expansion tool (swaging tool), which establishes an internal hydraulic pressure in the pipe in 5 the area between the tool seals against the pipe wall ® Support and sealing ring

Figur 2: 10 Swaging af trykrør udført.Figure 2: 10 Swaging of pressure pipes done.

Figur 3:Figure 3:

Skæremaskine monteret på bageste muffedel. Et rørstykke skåret af.Cutting machine mounted on rear socket. A piece of pipe cut off.

15 ® Roterende skæreværktøj monteret på bageste muffedel 20 Figur 4:15 ® Rotary cutting tool mounted on rear socket 20 Figure 4:

Dorn indført. Flangetrækkere monterede.Dorn trukket ind på plads.Dorn introduced. Flange pullers mounted.Dorn pulled in place.

© Flangetrækkere for indtrækning af dorn ® Konisk dorn med cylindrisk udboring som svarer til 25 indre diameter af trykrøret © Flange af vilkårlig type for sammenspænding med tilsvarende modpart© Flange puller for retraction of mandrel ® Tapered mandrel with cylindrical bore corresponding to 25 inner diameter of pressure pipe © Flange of any type for clamping with corresponding counterpart

Figur 5: DK 176803 B1Figure 5: DK 176803 B1

Hydraulisk donkraft anbragt for montering af støtte- og forseglingsring, idet der anvendes reaktion mod friktions-spændeanordningen.Hydraulic jack provided for mounting of support and sealing ring using reaction against friction clamping device.

5 © Hydraulisk donkraft for montering af støtte- og forseglingsring.5 © Hydraulic jack for mounting support and sealing ring.

10 Figur 6:Figure 6:

Samlingen er færdiggjort. Samlingsflader mellem bageste muffedel og dornen kan være forsynet med tætningsanordninger (ikke vist).The collection is complete. Connecting surfaces between the rear sleeve part and the mandrel may be provided with sealing devices (not shown).

Claims

15 Patent claims: Establishing pressure-bearing joints of free piping located on the seabed is a task that typically arises in connection with repair due to corrosion or other damage to the pipeline. Traditionally, 20 hyperbaric welding is used. In recent years, mechanical connectors based on elastomeric seals have been used. In addition, methods based on hydraulic expansion (swaging) of the pipe wall towards an outer part, thereby obtaining metal-metal sealing, have been applied. The invention described is a further development of these latter methods, based on the known swaging technology. The invention is characterized in that a pressure-bearing assembly is established on the free end φ of a pressure tube and is based on the use of a friction clamping device ©, a support and sealing ring φ, two sleeve parts @ and ® which can be clamped to a unit by use of longitudinally strong bolts ©, hydraulic swaging tool ©, which deforms the pipe wall © DK 176803 B1 plastic in radial direction, a cutting machine ®, which is mounted on the rear sleeve part (2) for cutting the pipe, and a conical mandrel with circular cylindrical bore ® for mounting inside the pipe © and subsequent tightening with the rear 5 socket part © using strong longitudinal bolts ©. The free end of the pressure tube © is provided by the method with a flange half ® of the desired type.