CA2580242A1 - Method for separating flanges - Google Patents
Method for separating flanges Download PDFInfo
- Publication number
- CA2580242A1 CA2580242A1 CA 2580242 CA2580242A CA2580242A1 CA 2580242 A1 CA2580242 A1 CA 2580242A1 CA 2580242 CA2580242 CA 2580242 CA 2580242 A CA2580242 A CA 2580242A CA 2580242 A1 CA2580242 A1 CA 2580242A1
- Authority
- CA
- Canada
- Prior art keywords
- flanges
- bolts
- cutting
- joint
- cutting tool
- 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.)
- Abandoned
Links
Landscapes
- Turning (AREA)
Abstract
A method for separating two flanges joined by bolts extending through boltholes provided therein comprises the use of a clamshell cutting apparatus having a rotating annulus with at least one cutting tool. The cutting tools are rotated and advanced against the bolts until they are sheared. The flanges are then separated from each other.
Description
3 [00011 The present invention relates to an improved method of separating flanges connected 4 together with bolts to form a joint in pipes and the like. More particularly, the invention relates to a method of flanges by the cutting of shearing of the bolts joining such flanges together.
7 [0002] The use of flanges on pipes is well known. Flanges serve to connect the ends of 8 pipes to other pipes, vessels or other such equipment. Generally, a flange includes a stem 9 portion that is permanently secured (normally with welds) to the end of a pipe or similar structure. The flange includes a face portion opposite to the stem. The flange face includes a 11 rim or disc with a plurality of circum ferenti ally spaced boltholes. In connecting, for example, 12 two pipe segments together, the stems of two flanges are first each secured to one end of the 13 respective pipe segments. The segments are then axially advanced towards each other so that the 14 flange faces are brought into opposition, with the respective boltholes aligned. The flanges are then secured to each other by inserting bolts through the boltholes. One or both ends of the bolts 16 may be provided with threaded portions to receive nuts as is commonly known in the art. The 17 nuts are tightened to join the flanges together. In some cases, the boltholes of the flanges may be 18 provided with threading to engage the bolts.
19 [0003] It is sometimes necessary to separate flanges from each other. To do so, the above mentioned nuts are first removed followed by removal of the bolts and, subsequently, separation 21 of the flanges. However, it is commonly known that the nuts and/or bolts are subject to 22 corrosion or other such damage and, in the result, removal of the nuts and/or bolts is rendered 23 difficult or impossible. In such cases, the bolts are removed with a cutting torch. As will be 24 appreciated, this process is time consuming and expensive. Moreover, the use of a torch may pose a significant hazard such as in cases where the pipes had contained flammable chemicals.
26 [00041 Various devices have been provided in the art for cutting sections of pipe. One such 27 cutting apparatus that has been found to be relatively efficient is known in the art as a 28 "clamshell" pipe cutter or pipe lathe. Examples of clamshell cutters are provided in US patent 29 numbers 5,189,933, 5,549,024 and 7,000,510. In general, a clamshell apparatus includes two concentric annular rings that are adapted to circumferentially surround the pipe to be cut. In 21614760.1 1 1 such apparatus, one of the rings is stationary and is secured to the outer wall of the pipe. The 2 other of the rings is capable of being rotated circumferentially about the pipe. The rotating ring 3 is provided with a cutting tool that is adapted to be gradually advanced against the pipe outer 4 wall in a radially inward direction. In operation, the second ring is rotated (by means of a motor for example) and the cutting tool is advanced against the pipe wall. The advancement of the 6 cutting tool progresses until the cutting tool cuts through the pipe wall.
Although clamshell 7 devices are well designed for cutting pipes, they are not used for separation of flanges from each 8 other.
9 [0005) The present invention serves to provide an efficient method of separating flanges.
SUMMARY OF THE INVENTION
11 [00061 In one aspect, the present invention provides a method of separating a joint formed by 12 two flanges, the flanges being connected together by means of bolts extending through boltholes 13 provided on each of the flanges, the method comprising:
14 - providing a cutting apparatus proximal to the joint, the cutting apparatus having a rotating annulus, the annulus having an inner diameter greater than the outer diameter of the 16 flanges, wherein the annulus includes at least one cutting tool on the inner diameter, the cutting 17 tool being directed radially inwardly and wherein the cutting tools are moveable radially 18 inwardly;
19 - positioning the cutting apparatus circumferentially over the joint and over the flanges;
- positioning the cutting apparatus whereby the cutting tool is positioned adjacent the 21 bolts;
22 - rotating the annulus circumferentially about the joint;
23 - advancing the cutting tool radially inwardly until the bolts are sheared;
and 24 - separating the flanges.
BRIEF DESCRIPTION OF THE DRAWINGS
26 [0007] These and other features of the invention will become more apparent in the following 27 detailed description in which reference is made to the appended drawings wherein:
28 [00081 Figure 1 is a side elevation illustrating the junction of two flanges.
29 100091 Figure 2 is a side elevation of the junction of Figure 1 provided with a cutting apparatus.
21614760.1 2 1 [0010] Figure 3 is a side elevation of the junction of Figure 1 provided with a cutting 2 apparatus.
3 [0011] Figure 4 is a partial cross sectional view of a joint created with two raised face 4 flanges.
DETAILED DESCRIPTION OF THE INVENTION
6 [0012] Figure 1 illustrates a typical junction of two flanges. As shown, the flanges 12 and 14 7 include, respectively, stem portions 16 and 18 and face portions 20 and 22.
The stem portions 8 are secured, such as with welds 23 and 25, respectively to the ends of pipes 24 and 26. Each of 9 the face portions of the flanges include a plurality of circumferentially spaced bolt holes 28. In joining the flanges together, the bolt holes of each flange are aligned together and bolts 30 are 11 passed there-through. The bolts are secured in position with nuts 32 that can be provided on one 12 or both ends of the bolts 30. In some situations, the boltholes on the flanges may be provided 13 with threads to engage the bolts. As will be apparent to persons skilled in the art, it is common 14 to provide a gasket or other such sealing means between the opposed flange faces. However, for clarity, such gasket is not illustrated in the drawings.
16 [0013] As discussed above, when separation of a flange joint is desired, the nuts 32 are 17 removed so as to allow the bolts 30 to be removed. The flanges can then be separated.
18 However, as also discussed above, it is often found that either the nuts 32 or bolts 30 are either 19 corroded or otherwise damaged in such a manner that removal of the nuts is not possible. In such cases, the bolts 30 are cut with torches and the like.
21 [0014] As mentioned above, examples of clamshell pipe cutters are provided in US patent 22 numbers 5,189,933, 5,549,024 and 7,000,510. The tools described in these references generally 23 comprise first and second semi-circular segments that are designed to be joined together to form 24 an annular assembly for encircling a shaft or pipe to be machined (i.e. cut or lathed). The assembly also generally includes a stationary ring, and a rotatable ring supported by bearings 26 affixed to the stationary ring. The rotatable ring includes a spur gear on its outer peripheral 27 surface and is journaled to the stationary ring for rotation about a concentrically disposed pipe or 28 work piece. A motor is attached to the stationary assembly and includes a drive gear designed to 29 mesh with the spur gear on the rotatable segment of the pipe lathe. A tool block for supporting a cutting tool is mounted to the rotatable segment and is designed such that a cutting tool is 31 advanced in small incremental steps in a radial direction against the pipe to be machined upon 21614760.1 3 I each orbit of the ring gear about the work piece. Various other examples of clamshell cutting 2 apparatus are known in the art.
3 [0015] As discussed above, clamshell type cutting apparatus are known for the purpose of 4 completely or partially effecting a circumferential cut in a pipe. However, with the present invention, a method is provided wherein known clamshell cutting apparatus are used for the 6 purpose of cutting the bolts and/or nuts used in a flange joint.
7 [0016] More specifically, Figure 2 illustrates the flange joint of Figure 1 wherein nuts 32 on 8 one side of the joint have been slightly loosened in order to expose a portion of the underlying 9 bolts 30. A clamshell apparatus, generally indicated at 34 is positioned over the joint between the two flanges. The apparatus includes a stationary ring 36 and a rotating ring 38. The rotating 11 ring 38 is provided with one or more cutting tools 40 comprising a blade.
As known in the art 12 and as described in the aforementioned US patents, the rotating ring 38 is driven by a motor (not 13 shown) and is caused to rotate about the circumference of the flanges 20 and 22. In accordance 14 with the standard operation of the apparatus 34, as the ring 38 is rotated, the cutting tools 40 are gradually advanced radially inwardly until they begin contacting the bolts 30.
Such 16 advancement of the cutting tools 40 is continued gradually until the bolts 30 are sheared.
17 Following this, the flanges are separated.
18 [0017] In some situations the loosening of the nuts 32 as described above is not possible. In 19 such case, the clamshell apparatus discussed above may be used to shear both the nut and the bolt. Such a situation is illustrated in Figure 3, where like elements are identified with like 21 reference numerals. As illustrated, the nuts 32 are not separated from the respective flange face.
22 The clamshell apparatus is positioned similarly to that shown in Figure 2 but, in this case, the 23 cutting tools 40 are positioned so as to first contact the nuts 32. The apparatus is operated in the 24 same manner as described above and advancement of the cutting tools 40 first results in shearing of the nuts 32 followed by shearing of the bolts 30 as the tools 40 are continually advanced.
26 [0018] In the description provided above, it has been assumed that the bolts are provided 27 with nuts on both ends thereof. It will be appreciated that it is common for one set of nuts to be 28 integral with the bolts or welded (or otherwise attached) thereto. In such case, only one set of 29 nuts would be rotatable or removable.
21614760.1 4 1 [0019] In a further embodiment, one of the flanges may be provided with a threaded bolthole 2 to receive and engage a bolt. In such case, it will be understood that no nuts may be required and 3 that the bolts are screwed into the threaded boltholes instead.
4 [00201 A further embodiment of the invention is illustrated in Figure 4, which depicts a "raised face flange". As will be known to persons skilled in the art, a raised face flange 6 generally comprises the same shape as the flanges discussed above. However, a raised face 7 flange includes a step portion forming the raised face. A shown in Figure 4, flanges 42 and 44 8 are generally as described above. However, the faces of the flanges, 46 and 48, respectively, 9 include raised portions 50 and 52, respectively. When arranged to form a joint, as shown in Figure 4, the raised portions 50 and 52 are brought into contact and bolts 54 are inserted through 11 aligned boltholes 56a and 56b in each of the flanges 46 and 48. As shown, the bolts 54 may 12 include integral nut portions 58 and opposite threaded portions 60. Nuts 62 are then provided on 13 the threaded portions 60 and tightened to force the flanges against each other. As shown in 14 Figure 4, once joined together, the flange faces 46 and 48 are separated by a gap 64 due to the presence of the raised faces discussed above. The gap 64 exposes a section of the bolts 54. The 16 gap may be wider if a gasket, such as that shown at 66 is provided.
According to the method of 17 the present invention, a clam shell cutting apparatus may be provided on the joint shown in 18 Figure 4 with the cutting too] positioned over the gap 64. As will be understood, the cutting tool 19 in this example is advanced and serves to cut the exposed section of the bolts 54. It will also be understood that although Figure 4 illustrates a joint involving two oppositely oriented raised face 21 flanges, other joints may be possible with only one raised face flange, with the opposite flange 22 including a flat face as shown in Figures 1 to 3. The size of the cutting tool used in the 23 embodiments described in Figure 4 will be understood to be dependent upon the width of the gap 24 64. Such sizing will be apparent to persons skilled in the art.
[0021] The method of the invention can be used or adapted for any of the embodiments 26 described above and other embodiments that would be known to persons skilled in the art.
27 [0022] It will be understood that the material chosen for manufacturing the cutting tools will 28 be of sufficient strength as to withstand the cutting of the bolts and/or nuts. In addition, it will be 29 understood that the clamshell cutting apparatus will be provided in a variety of sizes depending upon the diameter of the flanges. Normally, a certain amount of clearance will be provided 31 between the outer diameter of the flanges and the inner diameter of the annuli of the cutting 21614760.1 5 I apparatus so as to facilitate positioning of the device. Such sizing criteria will be apparent to 2 persons skilled in the art.
4 [0023] Although the invention has been described with reference to certain specific embodiments, various modifications thereof will be apparent to those skilled in the art without 6 departing from the spirit and scope of the invention as outlined in the claims appended hereto.
7 The disclosures of all prior art recited herein are incorporated herein by reference in their 8 entirety.
21614760.1 6
7 [0002] The use of flanges on pipes is well known. Flanges serve to connect the ends of 8 pipes to other pipes, vessels or other such equipment. Generally, a flange includes a stem 9 portion that is permanently secured (normally with welds) to the end of a pipe or similar structure. The flange includes a face portion opposite to the stem. The flange face includes a 11 rim or disc with a plurality of circum ferenti ally spaced boltholes. In connecting, for example, 12 two pipe segments together, the stems of two flanges are first each secured to one end of the 13 respective pipe segments. The segments are then axially advanced towards each other so that the 14 flange faces are brought into opposition, with the respective boltholes aligned. The flanges are then secured to each other by inserting bolts through the boltholes. One or both ends of the bolts 16 may be provided with threaded portions to receive nuts as is commonly known in the art. The 17 nuts are tightened to join the flanges together. In some cases, the boltholes of the flanges may be 18 provided with threading to engage the bolts.
19 [0003] It is sometimes necessary to separate flanges from each other. To do so, the above mentioned nuts are first removed followed by removal of the bolts and, subsequently, separation 21 of the flanges. However, it is commonly known that the nuts and/or bolts are subject to 22 corrosion or other such damage and, in the result, removal of the nuts and/or bolts is rendered 23 difficult or impossible. In such cases, the bolts are removed with a cutting torch. As will be 24 appreciated, this process is time consuming and expensive. Moreover, the use of a torch may pose a significant hazard such as in cases where the pipes had contained flammable chemicals.
26 [00041 Various devices have been provided in the art for cutting sections of pipe. One such 27 cutting apparatus that has been found to be relatively efficient is known in the art as a 28 "clamshell" pipe cutter or pipe lathe. Examples of clamshell cutters are provided in US patent 29 numbers 5,189,933, 5,549,024 and 7,000,510. In general, a clamshell apparatus includes two concentric annular rings that are adapted to circumferentially surround the pipe to be cut. In 21614760.1 1 1 such apparatus, one of the rings is stationary and is secured to the outer wall of the pipe. The 2 other of the rings is capable of being rotated circumferentially about the pipe. The rotating ring 3 is provided with a cutting tool that is adapted to be gradually advanced against the pipe outer 4 wall in a radially inward direction. In operation, the second ring is rotated (by means of a motor for example) and the cutting tool is advanced against the pipe wall. The advancement of the 6 cutting tool progresses until the cutting tool cuts through the pipe wall.
Although clamshell 7 devices are well designed for cutting pipes, they are not used for separation of flanges from each 8 other.
9 [0005) The present invention serves to provide an efficient method of separating flanges.
SUMMARY OF THE INVENTION
11 [00061 In one aspect, the present invention provides a method of separating a joint formed by 12 two flanges, the flanges being connected together by means of bolts extending through boltholes 13 provided on each of the flanges, the method comprising:
14 - providing a cutting apparatus proximal to the joint, the cutting apparatus having a rotating annulus, the annulus having an inner diameter greater than the outer diameter of the 16 flanges, wherein the annulus includes at least one cutting tool on the inner diameter, the cutting 17 tool being directed radially inwardly and wherein the cutting tools are moveable radially 18 inwardly;
19 - positioning the cutting apparatus circumferentially over the joint and over the flanges;
- positioning the cutting apparatus whereby the cutting tool is positioned adjacent the 21 bolts;
22 - rotating the annulus circumferentially about the joint;
23 - advancing the cutting tool radially inwardly until the bolts are sheared;
and 24 - separating the flanges.
BRIEF DESCRIPTION OF THE DRAWINGS
26 [0007] These and other features of the invention will become more apparent in the following 27 detailed description in which reference is made to the appended drawings wherein:
28 [00081 Figure 1 is a side elevation illustrating the junction of two flanges.
29 100091 Figure 2 is a side elevation of the junction of Figure 1 provided with a cutting apparatus.
21614760.1 2 1 [0010] Figure 3 is a side elevation of the junction of Figure 1 provided with a cutting 2 apparatus.
3 [0011] Figure 4 is a partial cross sectional view of a joint created with two raised face 4 flanges.
DETAILED DESCRIPTION OF THE INVENTION
6 [0012] Figure 1 illustrates a typical junction of two flanges. As shown, the flanges 12 and 14 7 include, respectively, stem portions 16 and 18 and face portions 20 and 22.
The stem portions 8 are secured, such as with welds 23 and 25, respectively to the ends of pipes 24 and 26. Each of 9 the face portions of the flanges include a plurality of circumferentially spaced bolt holes 28. In joining the flanges together, the bolt holes of each flange are aligned together and bolts 30 are 11 passed there-through. The bolts are secured in position with nuts 32 that can be provided on one 12 or both ends of the bolts 30. In some situations, the boltholes on the flanges may be provided 13 with threads to engage the bolts. As will be apparent to persons skilled in the art, it is common 14 to provide a gasket or other such sealing means between the opposed flange faces. However, for clarity, such gasket is not illustrated in the drawings.
16 [0013] As discussed above, when separation of a flange joint is desired, the nuts 32 are 17 removed so as to allow the bolts 30 to be removed. The flanges can then be separated.
18 However, as also discussed above, it is often found that either the nuts 32 or bolts 30 are either 19 corroded or otherwise damaged in such a manner that removal of the nuts is not possible. In such cases, the bolts 30 are cut with torches and the like.
21 [0014] As mentioned above, examples of clamshell pipe cutters are provided in US patent 22 numbers 5,189,933, 5,549,024 and 7,000,510. The tools described in these references generally 23 comprise first and second semi-circular segments that are designed to be joined together to form 24 an annular assembly for encircling a shaft or pipe to be machined (i.e. cut or lathed). The assembly also generally includes a stationary ring, and a rotatable ring supported by bearings 26 affixed to the stationary ring. The rotatable ring includes a spur gear on its outer peripheral 27 surface and is journaled to the stationary ring for rotation about a concentrically disposed pipe or 28 work piece. A motor is attached to the stationary assembly and includes a drive gear designed to 29 mesh with the spur gear on the rotatable segment of the pipe lathe. A tool block for supporting a cutting tool is mounted to the rotatable segment and is designed such that a cutting tool is 31 advanced in small incremental steps in a radial direction against the pipe to be machined upon 21614760.1 3 I each orbit of the ring gear about the work piece. Various other examples of clamshell cutting 2 apparatus are known in the art.
3 [0015] As discussed above, clamshell type cutting apparatus are known for the purpose of 4 completely or partially effecting a circumferential cut in a pipe. However, with the present invention, a method is provided wherein known clamshell cutting apparatus are used for the 6 purpose of cutting the bolts and/or nuts used in a flange joint.
7 [0016] More specifically, Figure 2 illustrates the flange joint of Figure 1 wherein nuts 32 on 8 one side of the joint have been slightly loosened in order to expose a portion of the underlying 9 bolts 30. A clamshell apparatus, generally indicated at 34 is positioned over the joint between the two flanges. The apparatus includes a stationary ring 36 and a rotating ring 38. The rotating 11 ring 38 is provided with one or more cutting tools 40 comprising a blade.
As known in the art 12 and as described in the aforementioned US patents, the rotating ring 38 is driven by a motor (not 13 shown) and is caused to rotate about the circumference of the flanges 20 and 22. In accordance 14 with the standard operation of the apparatus 34, as the ring 38 is rotated, the cutting tools 40 are gradually advanced radially inwardly until they begin contacting the bolts 30.
Such 16 advancement of the cutting tools 40 is continued gradually until the bolts 30 are sheared.
17 Following this, the flanges are separated.
18 [0017] In some situations the loosening of the nuts 32 as described above is not possible. In 19 such case, the clamshell apparatus discussed above may be used to shear both the nut and the bolt. Such a situation is illustrated in Figure 3, where like elements are identified with like 21 reference numerals. As illustrated, the nuts 32 are not separated from the respective flange face.
22 The clamshell apparatus is positioned similarly to that shown in Figure 2 but, in this case, the 23 cutting tools 40 are positioned so as to first contact the nuts 32. The apparatus is operated in the 24 same manner as described above and advancement of the cutting tools 40 first results in shearing of the nuts 32 followed by shearing of the bolts 30 as the tools 40 are continually advanced.
26 [0018] In the description provided above, it has been assumed that the bolts are provided 27 with nuts on both ends thereof. It will be appreciated that it is common for one set of nuts to be 28 integral with the bolts or welded (or otherwise attached) thereto. In such case, only one set of 29 nuts would be rotatable or removable.
21614760.1 4 1 [0019] In a further embodiment, one of the flanges may be provided with a threaded bolthole 2 to receive and engage a bolt. In such case, it will be understood that no nuts may be required and 3 that the bolts are screwed into the threaded boltholes instead.
4 [00201 A further embodiment of the invention is illustrated in Figure 4, which depicts a "raised face flange". As will be known to persons skilled in the art, a raised face flange 6 generally comprises the same shape as the flanges discussed above. However, a raised face 7 flange includes a step portion forming the raised face. A shown in Figure 4, flanges 42 and 44 8 are generally as described above. However, the faces of the flanges, 46 and 48, respectively, 9 include raised portions 50 and 52, respectively. When arranged to form a joint, as shown in Figure 4, the raised portions 50 and 52 are brought into contact and bolts 54 are inserted through 11 aligned boltholes 56a and 56b in each of the flanges 46 and 48. As shown, the bolts 54 may 12 include integral nut portions 58 and opposite threaded portions 60. Nuts 62 are then provided on 13 the threaded portions 60 and tightened to force the flanges against each other. As shown in 14 Figure 4, once joined together, the flange faces 46 and 48 are separated by a gap 64 due to the presence of the raised faces discussed above. The gap 64 exposes a section of the bolts 54. The 16 gap may be wider if a gasket, such as that shown at 66 is provided.
According to the method of 17 the present invention, a clam shell cutting apparatus may be provided on the joint shown in 18 Figure 4 with the cutting too] positioned over the gap 64. As will be understood, the cutting tool 19 in this example is advanced and serves to cut the exposed section of the bolts 54. It will also be understood that although Figure 4 illustrates a joint involving two oppositely oriented raised face 21 flanges, other joints may be possible with only one raised face flange, with the opposite flange 22 including a flat face as shown in Figures 1 to 3. The size of the cutting tool used in the 23 embodiments described in Figure 4 will be understood to be dependent upon the width of the gap 24 64. Such sizing will be apparent to persons skilled in the art.
[0021] The method of the invention can be used or adapted for any of the embodiments 26 described above and other embodiments that would be known to persons skilled in the art.
27 [0022] It will be understood that the material chosen for manufacturing the cutting tools will 28 be of sufficient strength as to withstand the cutting of the bolts and/or nuts. In addition, it will be 29 understood that the clamshell cutting apparatus will be provided in a variety of sizes depending upon the diameter of the flanges. Normally, a certain amount of clearance will be provided 31 between the outer diameter of the flanges and the inner diameter of the annuli of the cutting 21614760.1 5 I apparatus so as to facilitate positioning of the device. Such sizing criteria will be apparent to 2 persons skilled in the art.
4 [0023] Although the invention has been described with reference to certain specific embodiments, various modifications thereof will be apparent to those skilled in the art without 6 departing from the spirit and scope of the invention as outlined in the claims appended hereto.
7 The disclosures of all prior art recited herein are incorporated herein by reference in their 8 entirety.
21614760.1 6
Claims (3)
1. A method of separating a joint formed by two flanges, said flanges being connected together by means of bolts extending through boltholes provided on each of the flanges, the method comprising:
providing a cutting apparatus proximal to said joint, the cutting apparatus having a rotating annulus, the annulus having an inner diameter greater than the outer diameter of the flanges, wherein the annulus includes at least one cutting tool on said inner diameter, said cutting tool being directed radially inwardly and wherein said cutting tools are moveable radially inwardly;
- positioning said cutting apparatus circumferentially over said joint and over said flanges;
- positioning said cutting apparatus whereby said cutting tool is positioned adjacent said bolts;
- rotating said annulus circumferentially about said joint;
- advancing said cutting tool radially inwardly until said bolts are sheared;
and - separating said flanges.
providing a cutting apparatus proximal to said joint, the cutting apparatus having a rotating annulus, the annulus having an inner diameter greater than the outer diameter of the flanges, wherein the annulus includes at least one cutting tool on said inner diameter, said cutting tool being directed radially inwardly and wherein said cutting tools are moveable radially inwardly;
- positioning said cutting apparatus circumferentially over said joint and over said flanges;
- positioning said cutting apparatus whereby said cutting tool is positioned adjacent said bolts;
- rotating said annulus circumferentially about said joint;
- advancing said cutting tool radially inwardly until said bolts are sheared;
and - separating said flanges.
2. The method of claim 1 wherein said cutting tool is first advanced against nuts provided over said bolts.
3. The method of claim 1 wherein said cutting apparatus comprises a clamshell cutting apparatus.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US77841506P | 2006-03-03 | 2006-03-03 | |
| US60/778,415 | 2006-03-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2580242A1 true CA2580242A1 (en) | 2007-09-03 |
Family
ID=38520939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2580242 Abandoned CA2580242A1 (en) | 2006-03-03 | 2007-03-02 | Method for separating flanges |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2580242A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105817942A (en) * | 2016-05-13 | 2016-08-03 | 中广核研究院有限公司 | Bolt dumping protection device for pressure vessel of nuclear power plant |
| CN115446567A (en) * | 2018-07-11 | 2022-12-09 | 吉斯通塔***公司 | A system for flange assembly of a tubular structure; method of fitting a flange to a tubular section |
-
2007
- 2007-03-02 CA CA 2580242 patent/CA2580242A1/en not_active Abandoned
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105817942A (en) * | 2016-05-13 | 2016-08-03 | 中广核研究院有限公司 | Bolt dumping protection device for pressure vessel of nuclear power plant |
| CN115446567A (en) * | 2018-07-11 | 2022-12-09 | 吉斯通塔***公司 | A system for flange assembly of a tubular structure; method of fitting a flange to a tubular section |
| CN115446567B (en) * | 2018-07-11 | 2024-07-12 | 吉斯通塔***公司 | A system for flange fitting of a tubular structure; method of assembling flange to tubular section |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20080010801A1 (en) | Method for separating flanges | |
| US6470907B1 (en) | Existing pipe cut-off method, existing pipe slitting method, piping structure, and valve insertion method for inserting a valve in a line without stopping passage of water or fluid | |
| EP0316417B1 (en) | A fastening device | |
| US8082823B2 (en) | Scraping tool | |
| US20120222753A1 (en) | Device for work implementation without stopping flow, and method for work implementation without stopping flow | |
| US11389909B2 (en) | Method and tool for reconditioning a damaged thread | |
| US7412788B2 (en) | Demolition claw | |
| US5216941A (en) | Tool for securing a fastening device | |
| GB2491489A (en) | Split pipe repair fitting | |
| US4271870A (en) | Method and apparatus for blocking the flow of fluids through an elongated pipe section | |
| WO2013007998A1 (en) | Multi-component work-piece and tool | |
| CA2580242A1 (en) | Method for separating flanges | |
| US5373636A (en) | Bearing removal system | |
| CN104816044A (en) | Mouse cage type external anticorrosion coating stripping device of steel pipeline | |
| US6131597A (en) | Method and apparatus for cutting, sealing and opening pipe | |
| US7093864B2 (en) | Connecting element for pipes and method for welding a connecting element onto the end of a pipe | |
| WO2015026532A1 (en) | Tool bit for cutting an object | |
| JP2005008393A (en) | Screw conveyor without shaft and its manufacturing method | |
| US4271733A (en) | Rotary tools | |
| JP2009058134A (en) | Pipe joint structure and fluid pipe for pipe joint structure | |
| US20060252555A1 (en) | Close coupled disc pack coupling and method of use | |
| US4850158A (en) | Method of making buffing wheel | |
| JPH06170258A (en) | Mounting structure of driving gear tooth of gyratory crusher | |
| JP4261842B2 (en) | Residual pipe joint method and residual pipe joint structure | |
| GB2029751A (en) | Rotary tools |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |
Effective date: 20130304 |