WO2002086375A1 - Method for cutting off a tube and for blocking the flow - Google Patents

Method for cutting off a tube and for blocking the flow Download PDF

Info

Publication number
WO2002086375A1
WO2002086375A1 PCT/FI2001/000387 FI0100387W WO02086375A1 WO 2002086375 A1 WO2002086375 A1 WO 2002086375A1 FI 0100387 W FI0100387 W FI 0100387W WO 02086375 A1 WO02086375 A1 WO 02086375A1
Authority
WO
WIPO (PCT)
Prior art keywords
cut
flanges
pipe
unit
fitting
Prior art date
Application number
PCT/FI2001/000387
Other languages
French (fr)
Inventor
Kari Nisso
Original Assignee
Tonisco System Oy
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tonisco System Oy filed Critical Tonisco System Oy
Priority to PCT/FI2001/000387 priority Critical patent/WO2002086375A1/en
Publication of WO2002086375A1 publication Critical patent/WO2002086375A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/10—Means for stopping flow from or in pipes or hoses
    • F16L55/105—Closing devices introduced radially into the pipe or hose

Definitions

  • the invention relates to a method to cut off a pressurized pipe, while preventing leaks caused thereby, whereby the method also includes the necessary blocking of the cut-off point in pipe by means of a valve so that the valve can be also opened.
  • Previously known as ways of pipe blocking is to flatten the pipe solid so that it can be cut off or, on the instant, to fix a valve in the part of no flow. Further known, especially regarding a water pipe, is freezing up the pipe from the outside by strong cooling.
  • a branching method of a prezzurized pipe is known, whereby around the pipe, for instance by welding pipe halves together, a branching collar is built, and then to the flange a valve that opens completely, e.g. a ball valve or a sandwich valve is fixed and through the original pipe a branching hole is drilled by means of a bit furnished with a tightened drill rod. The drill is pulled out, the valve in the branch shut and then, reopening the valve, through the valve a plug part is taken pushing it into the original pipe to the branch in order to block the pipe. The plug can be opened and closed through the branch.
  • the invention is characterized in that the method comprises following stages:
  • Control flanges formed of pipe halves are fitted at a dis-tance from each other around the pipe and, between them as many O-ring seals as needed are fitted, which are formed formed to rings by gluing, between the control flanges fitted a cross-cut unit is fitted that can be composed of pieces, between the second control flange and the cross-cut unit two adjacent sealing flanges are fitted that can be composed of pieces, most suitably of halves, outside the control flanges fitted support flanges fitted bound together by means of mutual distance parts to receive the forces left after the cut-off, the pipe is cut off with the cut-off unit, sealing flanges and cut-off unit are moved sideways so that the cut-off point gets covered by the sealing flanges and the shut-off part is pushed between the sealing flanges to block the pipe.
  • sealing flanges can be left out if the support flanges are fitted in position by welding, for instance.
  • the advantage of the invention is that by a quite small number of simple parts fitted around the pipe a fully satisfying pipe blocking situation and a working valve are achieved in a pressurized pipe. Later on, the apparatus can also be removed completely and if the pipe must be welded, the cut-off point can be welded together. There will be no branch point, no holes in the side, only a clean cut-off point When the Sandwich valve is placed vertically in regard to the pipe, in the cut-off point a gap is needed only for the thickness of the valve shut-off part.
  • Fig. 1 shows a pipe to be blocked.
  • Fig. 2 shows the assembly of control flanges
  • Fig. 3 shows the assembly of the cut-off unit.
  • Fig. 4 shows the assembly of sealing flanges.
  • Fig. 5 shows the pipe with sealing flanges assembled.
  • Fig. 6 shows the assembly of support flanges.
  • Fig. 7 shows cutting off the pipe.
  • Fig. 8 shows moving the parts sideways.
  • Fig. 9 shows a situation with the cut-off unit removed.
  • Fig. 10 shows the assembly of the shut-off part.
  • Figure 1 is a round prezzurized flow pipe to be cut off between point A and B and blocked.
  • Figure 2 is the assembly of two-piece control flanges 2 around pipe 1 at a distance from each other.
  • the flanges are tightened strongly on the pipe surface.
  • Between the flanges as many O-ring seals 3 as needed are fitted, for instance cut from a band and glued to form a ring.
  • Figure 3 is the assembly of the two-piece cut-off apparatus 4 between flanges 2.
  • the apparatus has grooves for two O-ring seals 3 that come against the pipe.
  • Figure 4 is the assembly of two sealing flanges 5 side by side beside the cut-off apparatus. There will be one O-ring seal each between flanges 5 and pipe 1. There is between the second flange 5 and cut-off apparatus 4 a groove for the O-ring seal. In flanges 5 there is also a groove on the same place in both on them for the O-ring seal, which arrive thus to match each other. Between flanges 5 there will remain a gap of a few millimetres, but the seals are in contact with each other.
  • Figure 7 shows the pipe being cut off the by cut-off apparatus 4 cutting off the pipe nearby the centre line inside the cut-off apparatus 4.
  • Cut-off is started by feeding the cutoff tool of the apparatus through the pipe wall.
  • the tool can be a circular disc or of a type like an end-milling cutter.
  • the apparatus is rotated around the pipe once or several times. Rotation of tool can take place from the outside by a drilling machine.
  • a construction possible is also that the cut-off machine is not rotated around the pipe but the cutoff tool is rolling around the pipe.
  • the O-ring seals of the cut-off apparatus prevent the leak from advancing when the pipe has burst.
  • both the cut-off apparatus 4 and the sealing flanges 5 are moved together sideways as per figure 8 so that the cut-off point gets to the area between the O-ring seals.
  • the width of the cut-off point varies from 2 mm to 20 mm depending on the pipe diameter.
  • Figure 9 is presented with the cut-off apparatus removed and where one distance part 8 has before that been detached to facilitat>e the removal. Sealing flanges can be welded in place on pipe 1, if the materials are can be welded.
  • Figures 10 and 11 show pushing of a thin sealing plate between sealing flanges 5 in order to block pipe 1.
  • Shut-off part 9 moves the O-rings slightly between flanges to their grooves, so that the plate can penetrate between the flanges. The tightness works all the time by means of the O-rings. In pipe 1 pressure can come and go from both directions.
  • the method including apparatus is most suitably used in connection with modifications and restorations of water pipe-lines, district heat pipes and different process pipelines.
  • the pressure in pipe must not be let out nor the flow blocked when the job is carried out.

Abstract

A method to cut off a pipe and to block the flow in a pressurized pipe (1), which method comprises following stages: fixing control flanges (2), which can be composed of pieces, around the pipe and fitting between them a wanted number of o-rings (3); fitting between the control flanges a cut-off unit (4), which can be composed of pieces; fitting two sealing flanges (5), which can be composed of halves, side by side between the second control flange and cut-off unit (4); fitting support flanges (7), bound together by distance parts (8), outside control flanges (2) to receive the forces left over from pipe cut-off; cutting off the pipe (1) with cut-off apparatus (4); moving sealing flanges (5) and cutting-unit (4) sideways so that sealing flanges (5) will cover the cut-off point; removing cut-off unit (4) and pushing shut-off part (9) between sealing flanges (5) to block pipe (1).

Description

METHOD FOR CUTTTING OFF A TUBE AND FOR BLOCKING THE FLO
The invention relates to a method to cut off a pressurized pipe, while preventing leaks caused thereby, whereby the method also includes the necessary blocking of the cut-off point in pipe by means of a valve so that the valve can be also opened.
Previously known as ways of pipe blocking is to flatten the pipe solid so that it can be cut off or, on the instant, to fix a valve in the part of no flow. Further known, especially regarding a water pipe, is freezing up the pipe from the outside by strong cooling. In addition, a branching method of a prezzurized pipe is known, whereby around the pipe, for instance by welding pipe halves together, a branching collar is built, and then to the flange a valve that opens completely, e.g. a ball valve or a sandwich valve is fixed and through the original pipe a branching hole is drilled by means of a bit furnished with a tightened drill rod. The drill is pulled out, the valve in the branch shut and then, reopening the valve, through the valve a plug part is taken pushing it into the original pipe to the branch in order to block the pipe. The plug can be opened and closed through the branch.
The above presented methods have several disadvantages. Flattening does not work on several but only on few pipe materials and is often impossible reopen the flattening. Freezing can be applied only to solidifying liquids. The method last referred to is complicated, while requiring in the side of the original pipe a hole made in the same diameter size as the pipe, so that the plug, blocking the pipe completely, can be put through the hole into the pipe.
By means of the method as per this invention the above disadvantages are solved and an improvement of the prevailing technique in the field achieved. The invention is characterized in that the method comprises following stages:
Control flanges formed of pipe halves are fitted at a dis-tance from each other around the pipe and, between them as many O-ring seals as needed are fitted, which are formed formed to rings by gluing, between the control flanges fitted a cross-cut unit is fitted that can be composed of pieces, between the second control flange and the cross-cut unit two adjacent sealing flanges are fitted that can be composed of pieces, most suitably of halves, outside the control flanges fitted support flanges fitted bound together by means of mutual distance parts to receive the forces left after the cut-off, the pipe is cut off with the cut-off unit, sealing flanges and cut-off unit are moved sideways so that the cut-off point gets covered by the sealing flanges and the shut-off part is pushed between the sealing flanges to block the pipe.
Alternatively, sealing flanges can be left out if the support flanges are fitted in position by welding, for instance.
Other, for the invention advantageous, embodiments, are presented in the dependent claims.
The advantage of the invention is that by a quite small number of simple parts fitted around the pipe a fully satisfying pipe blocking situation and a working valve are achieved in a pressurized pipe. Later on, the apparatus can also be removed completely and if the pipe must be welded, the cut-off point can be welded together. There will be no branch point, no holes in the side, only a clean cut-off point When the Sandwich valve is placed vertically in regard to the pipe, in the cut-off point a gap is needed only for the thickness of the valve shut-off part.
In the following the invention is disclosed with reference to the drawing, where
Fig. 1 shows a pipe to be blocked.
Fig. 2 shows the assembly of control flanges
Fig. 3 shows the assembly of the cut-off unit. Fig. 4 shows the assembly of sealing flanges.
Fig. 5 shows the pipe with sealing flanges assembled.
Fig. 6 shows the assembly of support flanges.
Fig. 7 shows cutting off the pipe.
Fig. 8 shows moving the parts sideways. Fig. 9 shows a situation with the cut-off unit removed.
Fig. 10 shows the assembly of the shut-off part.
Fig. 11 shows the shut-off part function. Figure 1 is a round prezzurized flow pipe to be cut off between point A and B and blocked.
Figure 2 is the assembly of two-piece control flanges 2 around pipe 1 at a distance from each other. The flanges are tightened strongly on the pipe surface. Between the flanges as many O-ring seals 3 as needed are fitted, for instance cut from a band and glued to form a ring.
Figure 3 is the assembly of the two-piece cut-off apparatus 4 between flanges 2. The apparatus has grooves for two O-ring seals 3 that come against the pipe.
Figure 4 is the assembly of two sealing flanges 5 side by side beside the cut-off apparatus. There will be one O-ring seal each between flanges 5 and pipe 1. There is between the second flange 5 and cut-off apparatus 4 a groove for the O-ring seal. In flanges 5 there is also a groove on the same place in both on them for the O-ring seal, which arrive thus to match each other. Between flanges 5 there will remain a gap of a few millimetres, but the seals are in contact with each other.
In figure 5 the sealing flanges 5 are fitted and the distance of control flanges 2 is checked and they are tightened at a distance determined by the distance parts 8 of support flanges 7 as per figure 6 so that support flanges 7 also lean against control flanges 2 and the construction becomes stable. Control flanges 7 are also halves and as many distance parts 8 as needed are fitted.
Figure 7 shows the pipe being cut off the by cut-off apparatus 4 cutting off the pipe nearby the centre line inside the cut-off apparatus 4. Cut-off is started by feeding the cutoff tool of the apparatus through the pipe wall. The tool can be a circular disc or of a type like an end-milling cutter. When the cutoff tool has got through the pipe wall, the apparatus is rotated around the pipe once or several times. Rotation of tool can take place from the outside by a drilling machine. A construction possible is also that the cut-off machine is not rotated around the pipe but the cutoff tool is rolling around the pipe. The O-ring seals of the cut-off apparatus prevent the leak from advancing when the pipe has burst. When the pipe has been cut-off both the cut-off apparatus 4 and the sealing flanges 5 are moved together sideways as per figure 8 so that the cut-off point gets to the area between the O-ring seals. The width of the cut-off point varies from 2 mm to 20 mm depending on the pipe diameter.
There are between sealing flanges and the pipe and between sealing flanges among themselves sealing rings to control the tightness in this position.
Figure 9 is presented with the cut-off apparatus removed and where one distance part 8 has before that been detached to facilitat>e the removal. Sealing flanges can be welded in place on pipe 1, if the materials are can be welded.
Alternatively, it is possible to proceed (claim 2) so that control flanges are not used at all. Instead support flanges 7 are fitted and welded in place on pipe 1 at a distance from each other determined by distance parts 8.
Figures 10 and 11 show pushing of a thin sealing plate between sealing flanges 5 in order to block pipe 1. Shut-off part 9 moves the O-rings slightly between flanges to their grooves, so that the plate can penetrate between the flanges. The tightness works all the time by means of the O-rings. In pipe 1 pressure can come and go from both directions.
The method including apparatus is most suitably used in connection with modifications and restorations of water pipe-lines, district heat pipes and different process pipelines. The pressure in pipe must not be let out nor the flow blocked when the job is carried out.

Claims

1. A method to cut off a pipe and to block the flow in a pressurized pipe (1) characterized in that the method comprises following stages:
- fixing control flanges (2), which can be composed of pieces, around the pipe at a distance from each other and fitting between them a wanted number of O-rings (3) formed into rings by gluing,
- fitting between control flanges (2) a cut-off unit (4), which can be composed of pieces, most suitably of halves.
- fitting two sealing flanges (5), which can most suitably be composed of halves, side by side between the second control flange (2) and cut-off unit (4),
- fitting support flanges (7), bound together by means of their mutual distance parts (8,) outside control flanges (2) to receive the forces left over from pipe cut-off. - cutting off pipe (1) with cut-off apparatus (4),
- moving sealing flanges (5) and cutting-unit (4) sideways so that sealing flanges (5) will cover the cut-off point,
- removing cut-off unit 4 and pushing shut-off part (9) between sealing flanges (5) to block pipe (1).
2. A method to cut off a pipe and to shut-off the flow in a pressurized pipe (1) characterized in that the method comprises following stages:
- fixing around the pipe, for instance by welding at a distance, determined by distance flanges (8), from each other support flanges (7) composed of pieces and other and fitting between them a wanted number of o-rings (3) formed into rings by gluing,
- fitting between support flanges (7) a cut-off unit (4), which can be composed of pieces, most suitably of halves,
- fitting two sealing flanges (5), which can most suitably be composed of halves, side by side between the second support flange (2) and cut-off unit (4), - fitting distance parts (8), which join support flanges (7), and by means of which the bound-together support flanges (7) are arranged to receive the forces left over from pipe cut-off,
- cutting off the pipe (1) with cut-off apparatus (4),
- moving sealing flanges (5) and cut-off unit (4) sideways so that sealing flanges will cover the cut-off point, removing cut-off unit 4 and pushing shut-off part (9) between sealing flanges (5) to block pipe (1).
3. A method according to claim 1 or 2 characterized in that removal of cut-off unit (4) and location of shut-off part (9) into blocking position are carried out from between distance flanges (8).
4. A method according to claim 1 or 2 characterized in that cut-off unit (4) and sealing flanges (5) are moved sideways together in contact with each other.
5. A method according to any above claim 1 - 4 characterized in that removing one or several distance flanges (8) a space is achieved for the removal of cut-off unit (4) and for the function of shut-off part (9).
6. A method according to any above claim 1, 3 - 5 characterized in that support flanges (7) are fixed to control flanges (2).
PCT/FI2001/000387 2001-04-20 2001-04-20 Method for cutting off a tube and for blocking the flow WO2002086375A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/FI2001/000387 WO2002086375A1 (en) 2001-04-20 2001-04-20 Method for cutting off a tube and for blocking the flow

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FI2001/000387 WO2002086375A1 (en) 2001-04-20 2001-04-20 Method for cutting off a tube and for blocking the flow

Publications (1)

Publication Number Publication Date
WO2002086375A1 true WO2002086375A1 (en) 2002-10-31

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Application Number Title Priority Date Filing Date
PCT/FI2001/000387 WO2002086375A1 (en) 2001-04-20 2001-04-20 Method for cutting off a tube and for blocking the flow

Country Status (1)

Country Link
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013000087A1 (en) * 2013-01-08 2014-07-10 Stöbich Brandschutz GmbH Conduit partitioning device for isolating a pipe and pipeline and associated method
NO20161899A1 (en) * 2016-11-29 2018-05-30 Ik Norway As An arrangement for separating a connection between two pressurized flanged tube sections
EP3271628A4 (en) * 2015-05-05 2018-12-05 Thad Paul Sundrla Shut-off device
US10677361B2 (en) 2015-05-05 2020-06-09 Thad Paul Sundrla Shut-off device
US11255478B2 (en) 2015-05-05 2022-02-22 Thad Paul Sundrla Pipe repair device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3687166A (en) * 1970-08-25 1972-08-29 Paul E Herrin Repair valve
US4119115A (en) * 1976-03-19 1978-10-10 British Gas Corporation Stopping fluid flow in pipes
DE29912316U1 (en) * 1999-07-14 1999-10-14 Schuf Valve Technology Gmbh Plug-in glasses - tube closure
GB2341432A (en) * 1998-09-09 2000-03-15 Robert Edward Spence Stop tap
FI20000950A (en) * 2000-04-20 2001-10-21 Kari Nisso Procedure for cutting pipe and shutting off flow

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3687166A (en) * 1970-08-25 1972-08-29 Paul E Herrin Repair valve
US4119115A (en) * 1976-03-19 1978-10-10 British Gas Corporation Stopping fluid flow in pipes
GB2341432A (en) * 1998-09-09 2000-03-15 Robert Edward Spence Stop tap
DE29912316U1 (en) * 1999-07-14 1999-10-14 Schuf Valve Technology Gmbh Plug-in glasses - tube closure
FI20000950A (en) * 2000-04-20 2001-10-21 Kari Nisso Procedure for cutting pipe and shutting off flow

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013000087A1 (en) * 2013-01-08 2014-07-10 Stöbich Brandschutz GmbH Conduit partitioning device for isolating a pipe and pipeline and associated method
EP3271628A4 (en) * 2015-05-05 2018-12-05 Thad Paul Sundrla Shut-off device
US10677361B2 (en) 2015-05-05 2020-06-09 Thad Paul Sundrla Shut-off device
US11255478B2 (en) 2015-05-05 2022-02-22 Thad Paul Sundrla Pipe repair device
NO20161899A1 (en) * 2016-11-29 2018-05-30 Ik Norway As An arrangement for separating a connection between two pressurized flanged tube sections
WO2018101835A1 (en) * 2016-11-29 2018-06-07 Ik-Norway As An arrangement for separating a connection between two pressurized flanged tube sections
NO344027B1 (en) * 2016-11-29 2019-08-19 Ik Norway As An arrangement for separating a connection between two pressurized flanged tube sections
CN110168272A (en) * 2016-11-29 2019-08-23 Ik挪威公司 Equipment for separating the connection between two flanged tube sections of pressurization
AU2017367679B2 (en) * 2016-11-29 2020-01-16 Ik-Norway As An arrangement for separating a connection between two pressurized flanged tube sections
EA036998B1 (en) * 2016-11-29 2021-01-25 Ик-Норвэй Ас Arrangement for separating a connection between two pressurized flanged tube sections
US11149895B2 (en) 2016-11-29 2021-10-19 Ik-Norway As Arrangement for separating a connection between two pressurized flanged tube sections

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