US20120175078A1 - Heat exchanger tube cleaning apparatus and method of removing a blockage from a tube - Google Patents
Heat exchanger tube cleaning apparatus and method of removing a blockage from a tube Download PDFInfo
- Publication number
- US20120175078A1 US20120175078A1 US13/004,235 US201113004235A US2012175078A1 US 20120175078 A1 US20120175078 A1 US 20120175078A1 US 201113004235 A US201113004235 A US 201113004235A US 2012175078 A1 US2012175078 A1 US 2012175078A1
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- United States
- Prior art keywords
- tube
- anchor plate
- blockage
- blocked
- coil spring
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- 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
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G1/00—Non-rotary, e.g. reciprocated, appliances
- F28G1/06—Non-rotary, e.g. reciprocated, appliances having coiled wire tools, i.e. basket type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G15/00—Details
- F28G15/02—Supports for cleaning appliances, e.g. frames
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
Definitions
- the present invention relates to an apparatus and method for removing a blockage from a heat exchanger tube, such as a condenser tube of a steam generator.
- Heat exchanger tubes such as those provided in a condenser for a steam generator, often suffer from blockages which render the tube inoperative and reduces the efficiency of the steam generator.
- Various methods have been used to remove such a blockage, such as forcing a fluid driven projectile or scraper through the tube from an opening in a tube sheet, that aligns a plurality of tubes having openings through which fluid can flow.
- a tube cleaner is provided for removing a blockage from a heat exchanger tube, where the blocked tube is part of an array of tubes and where a tube sheet has spaced openings in alignment with open ends of the tube array.
- the tube cleaner includes an anchor-plate mountable on the tube sheet, and the anchor plate has a plurality of anchor plate openings passing through the plate, that are in registry with the openings in the tube sheet.
- At least one anchor plate fastener is provided on the anchor plate that secures the anchor plate to the tube sheet, with the open end of a blocked tube in registry with another anchor plate opening of the anchor plate.
- the anchor plate also includes means for mounting thereon a tube cleaner apparatus with access to the blocked tube and means for providing a driving force into the blocked tube, to dislodge and remove the blockage from the tube.
- the force for removal of the blockage may be provided, for example, by a flexible coil spring that is inserted through the anchor plate and into the open end of the tube, where the flexible coil spring is driven by a hydraulic drive to incrementally urge the same against the blockage to clear the blockage from the tube, or by a pressurized water gun that dislodges the blockage and urges the blockage through the tube.
- FIG. 1 is a perspective view of a tube sheet and a blocked tube of an array of tubes, with the other tubes removed for clarity;
- FIG. 2 is a perspective view showing an anchor plate of the tube cleaner of the present invention, with a flexible coil spring of the tube cleaner inserted into a blocked tube;
- FIG. 3 is a side view similar to that of FIG. 2 showing an expanded anchor plate fastener of the tube cleaner and the flexible coil spring manually inserted into the blocked tube to contact the blockage;
- FIG. 3A is an enlarged view of a portion of FIG. 3 for showing details of the anchor plate fastener of the tube cleaner;
- FIG. 3B is an enlarged view of a portion of FIG. 3 for showing details of a tube entry guide and a quick disconnect connector of the present invention
- FIG. 4 is a side view similar to FIG. 3 showing use of a driver for the flexible coil spring, the driver being set in a non-locked position and connected to a hydraulic advancer in a retracted condition;
- FIG. 4A is an enlarged view of a portion of FIG. 4 for showing details of the tube entry guide having the driver mounted thereon;
- FIG. 4B is an enlarged view of a portion of FIG. 4 for showing details of the attachment of the driver to the anchor plate, it is a cross-sectional view through a central axis of the quick disconnect connector;
- FIG. 5 is a view similar to FIG. 4 showing a gripper of the driver in a locked position with the flexible coil spring;
- FIG. 6 is a view similar to FIG. 5 showing completion of a hydraulic advancer stroke, with the hydraulic advancer in an extended condition, and advancement of the flexible coil spring against the blockage in the tube;
- FIG. 7 is a view similar to FIG. 6 showing the gripper of the driver unlocked so that the hydraulic advancer can be pulled back and the gripper locked on the flexible coil spring again, for a further incremental advancement of the flexible coil spring;
- FIG. 8 shows, in views 8 A through 8 D, the sequence of the driver and the incremental advancement of the flexible coil spring
- FIG. 9 shows a second embodiment of the heat exchanger tube cleaner wherein a pressurized fluid gun is used in conjunction with the anchor plate, as a method for removing a blockage
- FIG. 10 shows the pressurized fluid gun attached to the tube entry guide for impingement of the pressurized water from the pressurized fluid gun to remove the blockage from a tube;
- FIG. 11 is a side view similar to that of FIG. 10 showing impingement of the pressurized water from the pressurized fluid gun to remove the blockage from the tube;
- FIG. 11A is an enlarged view of a portion of FIG. 11 , for showing details of the tube entry guide having the pressurized fluid gun mounted thereon, and
- FIG. 12 is an enlarged view of an advancing end of the flexible coil spring for showing a plug attached thereto.
- the device of the present invention is for use on equipment of the type having a plurality of tubes arrayed between two tube sheets to which ends of the tubes are welded or mechanically connected.
- the equipment is most often used for exchanging heat to or from a medium inside the tube to a medium outside the tube. For efficient operation of the equipment, deposits formed on the inside of the tubes must be removed periodically.
- FIG. 1 shows one of the tube sheets 1 and, for clarity, only one of the tubes 2 .
- one tube would be associated with each opening 3 in the tube sheet.
- a blockage in the tube is indicated at 4 .
- the blockage might extend completely across the cross-section of the tube or might only partially block the tube.
- another tube sheet would typically be connected to the other end of the tube and the tube sheets would have a mirror image arrangement of openings. As shown in the example of FIG. 1 , the openings are typically arranged in an orderly pattern, however, such an arrangement is not necessary for use of the present device.
- the present device is most useful for deposits on the insides of the tubes that are not removable by known brushes or scrapers that are forced through the tubes with use of water pressure, or the like, as a larger force is possible with the present device.
- Known devices primarily consist of operator-held high-pressure guns, having a nozzle which is inserted into the end of the tube, for forcing a brush or scrapper through the tube. In the operator-held high-pressure guns the pressure is limited to that which can be opposed to by the operator. The present device enables the use of much higher pressures, as is discussed below.
- an anchor plate 5 which is of a size to extend across a plurality of openings 3 in the tube sheet, has preferably two anchor plate fasteners 6 that are arranged to be inserted into two of the plurality of tubes 2 , one on each side of the tube to be cleaned, as shown in FIGS. 2 and 3 .
- FIGS. 3 and 3A show more clearly the anchor plate fastener 6 inserted in the tube 2 .
- two anchor plate fasteners are shown, any number are possible in practice of the invention.
- Each anchor plate fastener 6 is elongated and is of a diameter slightly less than the inner diameter of the tube to initially slide into the tube. Then, the anchor plate fastener is expanded in order to contact the inside surface of the tube to an extent that pressure used for clearing the blockage (to be described below) does not move the anchor plate fastener in the tube.
- the expandable portion of the anchor plate fastener is preferably disposed in the tube near a portion of the tube which is surrounded by the tube sheet in order that pressure from the expandable portion is less likely to damage the tube. Any type of known anchoring means, in which an outer diameter expands, is possible for use in the present invention.
- an anchor plate entry opening 8 is provided for positioning in registry with the tube 2 , which is to be cleared.
- the anchor plate can be provided with openings, for insertion of the anchor plate fasteners, which are properly spaced relative to the entry opening 8 for a particular heat exchanger or the like being repaired, or the openings 7 in the anchor plate for the anchor plate fasteners can be elongated for easily aligning the anchor plate fasteners 6 and aligning the entry opening 8 with the tubes, as shown in FIG. 9 at 7 .
- the anchor plate further includes a means for mounting additional components of the tube cleaner for cleaning the blocked or partially blocked tube.
- the tube cleaner can provide either a fluid device for removing the blockage or a mechanical device for applying pressure and removing the blockage.
- One means for mounting either of the devices is the known quick disconnect connector manufactured for example by Snap-Tite, Union City, Pa., which is best viewed in FIGS. 3-3A at 9 , and in FIGS. 9 at 9 and 17 .
- FIG. 3B which is a cross-sectional view through a central axis of the quick disconnect connector
- FIGS. 3A-3C show the mating portion 9 attached to the tube entry guide 10 , prior to mounting either the mechanical device or the fluid device.
- FIGS. 4A-4B show the driver 12 of the mechanical device, mounted to the anchor plate 5 by sliding a slotted portion of the driver, indicated at 12 a , to be disposed between the anchor plate 5 and a flange 9 a of the quick disconnect connector.
- the quick disconnect connector is used in different manners for mounting either the fluid device or the mechanical device and FIG. 9 shows the same mating portion 9 of the quick disconnect connector, prior to having the fluid pressure device coupled with use of mating portion 17 .
- FIG. 10 shows the fluid pressure device mounted by engaging the mating portions 9 and 17 of the quick disconnect connector.
- the mating portion 17 preferably is not a part of the driver 12 of the mechanical device, however the other mating portion 9 can remain in place on the anchor plate for later use with the fluid pressure device.
- FIGS. 4-8 show the use of the mechanical device of the cleaning apparatus for removing the blockage.
- the mechanical device includes a flexible coil spring 11 that is preferably initially inserted by hand into the blocked tube.
- the flexible coil spring 11 is of a diameter slightly smaller than the inside diameter of the tube, and it is inserted until it makes contact with the blockage.
- An outer diameter of the flexible coil spring is preferably 80-90% of the inside diameter of the tube.
- the flexible coil spring is preferably made of metal and is of a length to enable advancement of the blockage to the distal end of the tube and then finally out the distal opening of the tube, if necessary.
- the flexible coil spring is of the type referred to as a tension flexible coil spring in which the wire of the spring is helically wound, with each successive winding being in contact with the previous winding.
- FIGS. 4-8 show the driver 12 for advancing the flexible coil spring and applying pressure on the blockage.
- the driver 12 includes a mechanical means for locking a gripper 13 on the flexible coil spring with use of a lever 14 .
- the gripper is in turn attached to a hydraulic advancer 15 which advances the flexible coil spring and which can apply a pressure of up to about 5,000 pounds to the blockage.
- the flexible coil spring has flexibility, which facilitates transporting and usage, when it is constrained within the tube 2 it has the properties of a solid rod to transfer the force from the hydraulic advancer 15 to the blockage in the tube.
- a tube entry guide 10 is provided in the anchor plate entry opening 8 as shown in FIGS. 3A-3C .
- the tube entry guide extends a short distance into the tube when the anchor plate is mounted to the tube sheet.
- FIGS. 4-6 show the driver 12 in various stages of its usage
- FIG. 8 shows the sequence of operation of the driver.
- the flexible coil spring 11 is positioned through the gripper 13 , however the gripper is not yet locked on the flexible coil spring.
- the lever 14 is shown rotated in a counter-clockwise direction so as to lock the gripper on the flexible coil spring.
- a piston 16 of the hydraulic advancer 15 is at a retracted position.
- a distal end of the flexible coil spring is in contact with the blockage 4 .
- FIG. 6 shows the driver 12 as it is positioned following advancement of the piston 16 of the advancer to it's extended position. Advancement of the piston moves the flexible coil spring deeper into the tube thus applying pressure to the blockage in order to advance the blockage in the tube. Depending on the nature and material of the blockage, the blockage may be fractured into smaller pieces when first advanced, leading to easy removal, or additional movement of the blockage toward the distal end of the tube may be required, if the blockage is not freed.
- FIG. 7 shows the lever 14 rotated clockwise from the position shown in FIG. 6 , thus releasing the locking of the gripper on the flexible coil spring. Following the releasing from the flexible coil spring, the piston 16 of the hydraulic advancer 15 is free to return to the retracted position in order to carry out additional advancements of the flexible coil spring.
- FIG. 8 shows the above described sequence for advancing the flexible coil spring.
- the sequence begins at 8 A at the top drawing and advances as indicated by the arrows to finish at 8 D.
- the sequence can be repeated as many times as necessary until the blockage is removed.
- the blockage may fracture into smaller pieces with one application of the pressure, however it might be necessary to advance the blockage entirely to the end of the tube in order to remove it.
- the flexible coil spring can be removed from the tube manually by releasing it from the gripper and pulling it backward out of the tube. With the coil spring being flexible, it is easily stored or transported.
- a plug 20 can be used at the advancing end of the flexible coil spring.
- the plug has a diameter slightly larger than the outer diameter of the flexible coil spring, and it can have threads for screwing into the hollow core of the flexible coil spring.
- a flat advancing face is preferred on the plug.
- Another method for removing a blockage is with the use of a liquid under high pressure.
- the anchor plate, described above, along with the tube entry guide 10 is used for connecting the above-discussed quick disconnect connector 9 , as shown in FIGS. 9-11 .
- an 0-ring, or the like is used between the outer surface of the tube entry guide and the inside of the tube, in order to prevent leakage of the high pressure liquid.
- the high pressure liquid device is attached to a high pressure source of fluid, such as water, having a pressure up to about 2000 pounds/in 2 .
- a preferred operating range is from about 800-2000 pounds/in 2 .
- the high pressure fluid gun 18 includes a pressure gauge 19 for use in monitoring the pressure of the fluid.
Abstract
A cleaning apparatus for removing a blockage from a heat exchanger tube of a steam generator, or the like, having a plurality of tubes extending between a pair of tube sheets. Anchor plate fasteners, which are expandable inside tubes adjacent to the blocked tube, are used to mount an anchor plate to one of the tube sheets. The anchor plate has an opening for aligning in registry with the condenser tube having the blockage and provides a solid platform for mounting either a mechanical device or a fluid pressure device for providing a force against the blockage for removal of the blockage. The cleaning apparatus enables a force to be applied which is significantly greater than that which can be applied with known hand-held devices for removing blockages.
Description
- The present invention relates to an apparatus and method for removing a blockage from a heat exchanger tube, such as a condenser tube of a steam generator.
- Heat exchanger tubes, such as those provided in a condenser for a steam generator, often suffer from blockages which render the tube inoperative and reduces the efficiency of the steam generator. Various methods have been used to remove such a blockage, such as forcing a fluid driven projectile or scraper through the tube from an opening in a tube sheet, that aligns a plurality of tubes having openings through which fluid can flow. However, it is not always possible to remove a blockage by this known method, especially if the blockage is across the entire opening of the tube.
- A tube cleaner is provided for removing a blockage from a heat exchanger tube, where the blocked tube is part of an array of tubes and where a tube sheet has spaced openings in alignment with open ends of the tube array. The tube cleaner includes an anchor-plate mountable on the tube sheet, and the anchor plate has a plurality of anchor plate openings passing through the plate, that are in registry with the openings in the tube sheet. At least one anchor plate fastener is provided on the anchor plate that secures the anchor plate to the tube sheet, with the open end of a blocked tube in registry with another anchor plate opening of the anchor plate. The anchor plate also includes means for mounting thereon a tube cleaner apparatus with access to the blocked tube and means for providing a driving force into the blocked tube, to dislodge and remove the blockage from the tube.
- The force for removal of the blockage may be provided, for example, by a flexible coil spring that is inserted through the anchor plate and into the open end of the tube, where the flexible coil spring is driven by a hydraulic drive to incrementally urge the same against the blockage to clear the blockage from the tube, or by a pressurized water gun that dislodges the blockage and urges the blockage through the tube.
- The invention will become more readily apparent from the following description of preferred embodiments thereof shown, by way of example, in the accompanying drawings, wherein:
-
FIG. 1 is a perspective view of a tube sheet and a blocked tube of an array of tubes, with the other tubes removed for clarity; -
FIG. 2 is a perspective view showing an anchor plate of the tube cleaner of the present invention, with a flexible coil spring of the tube cleaner inserted into a blocked tube; -
FIG. 3 is a side view similar to that ofFIG. 2 showing an expanded anchor plate fastener of the tube cleaner and the flexible coil spring manually inserted into the blocked tube to contact the blockage; -
FIG. 3A is an enlarged view of a portion ofFIG. 3 for showing details of the anchor plate fastener of the tube cleaner; -
FIG. 3B is an enlarged view of a portion ofFIG. 3 for showing details of a tube entry guide and a quick disconnect connector of the present invention; -
FIG. 4 is a side view similar toFIG. 3 showing use of a driver for the flexible coil spring, the driver being set in a non-locked position and connected to a hydraulic advancer in a retracted condition; -
FIG. 4A is an enlarged view of a portion ofFIG. 4 for showing details of the tube entry guide having the driver mounted thereon; -
FIG. 4B is an enlarged view of a portion ofFIG. 4 for showing details of the attachment of the driver to the anchor plate, it is a cross-sectional view through a central axis of the quick disconnect connector; -
FIG. 5 is a view similar toFIG. 4 showing a gripper of the driver in a locked position with the flexible coil spring; -
FIG. 6 is a view similar toFIG. 5 showing completion of a hydraulic advancer stroke, with the hydraulic advancer in an extended condition, and advancement of the flexible coil spring against the blockage in the tube; -
FIG. 7 is a view similar toFIG. 6 showing the gripper of the driver unlocked so that the hydraulic advancer can be pulled back and the gripper locked on the flexible coil spring again, for a further incremental advancement of the flexible coil spring; -
FIG. 8 shows, in views 8A through 8D, the sequence of the driver and the incremental advancement of the flexible coil spring; -
FIG. 9 shows a second embodiment of the heat exchanger tube cleaner wherein a pressurized fluid gun is used in conjunction with the anchor plate, as a method for removing a blockage; -
FIG. 10 shows the pressurized fluid gun attached to the tube entry guide for impingement of the pressurized water from the pressurized fluid gun to remove the blockage from a tube; -
FIG. 11 is a side view similar to that ofFIG. 10 showing impingement of the pressurized water from the pressurized fluid gun to remove the blockage from the tube; -
FIG. 11A is an enlarged view of a portion ofFIG. 11 , for showing details of the tube entry guide having the pressurized fluid gun mounted thereon, and -
FIG. 12 is an enlarged view of an advancing end of the flexible coil spring for showing a plug attached thereto. - The device of the present invention is for use on equipment of the type having a plurality of tubes arrayed between two tube sheets to which ends of the tubes are welded or mechanically connected. The equipment is most often used for exchanging heat to or from a medium inside the tube to a medium outside the tube. For efficient operation of the equipment, deposits formed on the inside of the tubes must be removed periodically.
-
FIG. 1 shows one of thetube sheets 1 and, for clarity, only one of thetubes 2. Typically, one tube would be associated with eachopening 3 in the tube sheet. A blockage in the tube is indicated at 4. The blockage might extend completely across the cross-section of the tube or might only partially block the tube. As discussed above, another tube sheet would typically be connected to the other end of the tube and the tube sheets would have a mirror image arrangement of openings. As shown in the example ofFIG. 1 , the openings are typically arranged in an orderly pattern, however, such an arrangement is not necessary for use of the present device. - The present device is most useful for deposits on the insides of the tubes that are not removable by known brushes or scrapers that are forced through the tubes with use of water pressure, or the like, as a larger force is possible with the present device. Known devices primarily consist of operator-held high-pressure guns, having a nozzle which is inserted into the end of the tube, for forcing a brush or scrapper through the tube. In the operator-held high-pressure guns the pressure is limited to that which can be opposed to by the operator. The present device enables the use of much higher pressures, as is discussed below.
- In order to provide the force required to remove the blockage, an
anchor plate 5, which is of a size to extend across a plurality ofopenings 3 in the tube sheet, has preferably twoanchor plate fasteners 6 that are arranged to be inserted into two of the plurality oftubes 2, one on each side of the tube to be cleaned, as shown inFIGS. 2 and 3 .FIGS. 3 and 3A show more clearly theanchor plate fastener 6 inserted in thetube 2. Although two anchor plate fasteners are shown, any number are possible in practice of the invention. - Each
anchor plate fastener 6 is elongated and is of a diameter slightly less than the inner diameter of the tube to initially slide into the tube. Then, the anchor plate fastener is expanded in order to contact the inside surface of the tube to an extent that pressure used for clearing the blockage (to be described below) does not move the anchor plate fastener in the tube. The expandable portion of the anchor plate fastener is preferably disposed in the tube near a portion of the tube which is surrounded by the tube sheet in order that pressure from the expandable portion is less likely to damage the tube. Any type of known anchoring means, in which an outer diameter expands, is possible for use in the present invention. - At a central portion of the anchor plate an anchor plate entry opening 8, best viewed in
FIG. 2 is provided for positioning in registry with thetube 2, which is to be cleared. In order to obtain the registry, the anchor plate can be provided with openings, for insertion of the anchor plate fasteners, which are properly spaced relative to the entry opening 8 for a particular heat exchanger or the like being repaired, or theopenings 7 in the anchor plate for the anchor plate fasteners can be elongated for easily aligning theanchor plate fasteners 6 and aligning the entry opening 8 with the tubes, as shown inFIG. 9 at 7. - The anchor plate further includes a means for mounting additional components of the tube cleaner for cleaning the blocked or partially blocked tube. The tube cleaner can provide either a fluid device for removing the blockage or a mechanical device for applying pressure and removing the blockage. One means for mounting either of the devices, although in differing manners, is the known quick disconnect connector manufactured for example by Snap-Tite, Union City, Pa., which is best viewed in
FIGS. 3-3A at 9, and inFIGS. 9 at 9 and 17. As shown in more detail inFIG. 3B , which is a cross-sectional view through a central axis of the quick disconnect connector, onemating portion 9 of the quick disconnect connector is connected to atube entry guide 10 mounted on the anchor plate.FIGS. 3A-3C show themating portion 9 attached to thetube entry guide 10, prior to mounting either the mechanical device or the fluid device. -
FIGS. 4A-4B show thedriver 12 of the mechanical device, mounted to theanchor plate 5 by sliding a slotted portion of the driver, indicated at 12 a, to be disposed between theanchor plate 5 and aflange 9 a of the quick disconnect connector. As mentioned above the quick disconnect connector is used in different manners for mounting either the fluid device or the mechanical device andFIG. 9 shows thesame mating portion 9 of the quick disconnect connector, prior to having the fluid pressure device coupled with use ofmating portion 17.FIG. 10 shows the fluid pressure device mounted by engaging themating portions mating portion 17 preferably is not a part of thedriver 12 of the mechanical device, however theother mating portion 9 can remain in place on the anchor plate for later use with the fluid pressure device. -
FIGS. 4-8 show the use of the mechanical device of the cleaning apparatus for removing the blockage. The mechanical device includes aflexible coil spring 11 that is preferably initially inserted by hand into the blocked tube. Theflexible coil spring 11 is of a diameter slightly smaller than the inside diameter of the tube, and it is inserted until it makes contact with the blockage. An outer diameter of the flexible coil spring is preferably 80-90% of the inside diameter of the tube. The flexible coil spring is preferably made of metal and is of a length to enable advancement of the blockage to the distal end of the tube and then finally out the distal opening of the tube, if necessary. The flexible coil spring is of the type referred to as a tension flexible coil spring in which the wire of the spring is helically wound, with each successive winding being in contact with the previous winding. -
FIGS. 4-8 show thedriver 12 for advancing the flexible coil spring and applying pressure on the blockage. Thedriver 12 includes a mechanical means for locking agripper 13 on the flexible coil spring with use of alever 14. The gripper is in turn attached to ahydraulic advancer 15 which advances the flexible coil spring and which can apply a pressure of up to about 5,000 pounds to the blockage. - Although the flexible coil spring has flexibility, which facilitates transporting and usage, when it is constrained within the
tube 2 it has the properties of a solid rod to transfer the force from thehydraulic advancer 15 to the blockage in the tube. Use of a flexible coil spring having a diameter less than that indicated above, however, may cause the flexible coil spring to buckle inside the tube and possibly rupturing the tube. - To provide lateral constraint for the portion of the flexible coil spring outside of the tube and to facilitate feeding the flexible coil spring into the tube, a
tube entry guide 10 is provided in the anchor plate entry opening 8 as shown inFIGS. 3A-3C . Preferably the tube entry guide extends a short distance into the tube when the anchor plate is mounted to the tube sheet. -
FIGS. 4-6 show thedriver 12 in various stages of its usage, andFIG. 8 shows the sequence of operation of the driver. InFIG. 4 , theflexible coil spring 11 is positioned through thegripper 13, however the gripper is not yet locked on the flexible coil spring. InFIG. 5 , thelever 14 is shown rotated in a counter-clockwise direction so as to lock the gripper on the flexible coil spring. In bothFIGS. 4 and 5 apiston 16 of thehydraulic advancer 15 is at a retracted position. Also, a distal end of the flexible coil spring is in contact with theblockage 4. -
FIG. 6 shows thedriver 12 as it is positioned following advancement of thepiston 16 of the advancer to it's extended position. Advancement of the piston moves the flexible coil spring deeper into the tube thus applying pressure to the blockage in order to advance the blockage in the tube. Depending on the nature and material of the blockage, the blockage may be fractured into smaller pieces when first advanced, leading to easy removal, or additional movement of the blockage toward the distal end of the tube may be required, if the blockage is not freed. -
FIG. 7 shows thelever 14 rotated clockwise from the position shown inFIG. 6 , thus releasing the locking of the gripper on the flexible coil spring. Following the releasing from the flexible coil spring, thepiston 16 of thehydraulic advancer 15 is free to return to the retracted position in order to carry out additional advancements of the flexible coil spring. -
FIG. 8 shows the above described sequence for advancing the flexible coil spring. The sequence begins at 8A at the top drawing and advances as indicated by the arrows to finish at 8D. The sequence can be repeated as many times as necessary until the blockage is removed. - As mentioned above, the blockage may fracture into smaller pieces with one application of the pressure, however it might be necessary to advance the blockage entirely to the end of the tube in order to remove it. Upon elimination of the blockage, the flexible coil spring can be removed from the tube manually by releasing it from the gripper and pulling it backward out of the tube. With the coil spring being flexible, it is easily stored or transported.
- In some applications a
plug 20, as shown inFIG. 12 , can be used at the advancing end of the flexible coil spring. Preferably, the plug has a diameter slightly larger than the outer diameter of the flexible coil spring, and it can have threads for screwing into the hollow core of the flexible coil spring. A flat advancing face is preferred on the plug. - Another method for removing a blockage is with the use of a liquid under high pressure. The anchor plate, described above, along with the
tube entry guide 10, is used for connecting the above-discussedquick disconnect connector 9, as shown inFIGS. 9-11 . Preferably, when the high pressure liquid device is used, an 0-ring, or the like is used between the outer surface of the tube entry guide and the inside of the tube, in order to prevent leakage of the high pressure liquid. - The high pressure liquid device is attached to a high pressure source of fluid, such as water, having a pressure up to about 2000 pounds/in2. A preferred operating range is from about 800-2000 pounds/in2. The high
pressure fluid gun 18 includes apressure gauge 19 for use in monitoring the pressure of the fluid. With use of theanchor plate 5 of the invention having thetube entry guide 10 and the quick disconnect connector, it is convenient to switch between the highpressure fluid gun 18 and thedriver 12, in order to remove the blockage from the tube in the most efficient manner.FIGS. 4A-B show, in an enlarged view, theanchor plate 5 having thedriver 12 mounted, andFIG. 11A shows, in an enlarged view, theanchor plate 5 having the highpressure fluid gun 18 mounted.
Claims (17)
1. A heat exchanger tube cleaner for removing a blockage in a tube, the blocked tube being part of an array of tubes wherein a tube sheet provides access to the tubes through openings in the tube sheet in registry with the tubes, comprising:
(a) an anchor plate for mounting on the tube sheet, the anchor plate having a plurality of anchor plate openings therethrough in registry with openings in the tube sheet,
(b) at least one anchor plate fastener for securing the anchor plate to the tube sheet such that the blocked tube is in registry with another anchor plate opening in the anchor plate,
(c) means on the anchor plate to mount a tube cleaning apparatus with access to the blocked tube through an anchor plate opening, and
(d) means for providing a driving force into the blocked tube, to clean the blockage from the tube, engageable with the anchor plate.
2. A tube cleaner as defined in claim 1 , wherein the driving force is provided by a flexible coil spring insertable into the blocked tube and wherein the flexible coil spring is operatively connected to a hydraulic drive to urge the flexible coil spring incrementally against the blockage to clear the blockage from the tube.
3. A tube cleaner as defined in claim 1 , wherein the driving force is provided by a pressurized water gun for supplying pressurized water to urge the blockage through the tube.
4. A tube cleaner as defined in claim 1 wherein the anchor plate fastener is expandable at a position in the anchor plate opening of the anchor plate.
5. A tube cleaner as defined in claim 1 wherein the anchor plate has a tube entry guide disposed thereon and a quick disconnect connector secured to the tube entry guide.
6. A tube cleaner as defined in claim 1 wherein a plurality of anchor plate fasteners are provided, each in registry with a respective tube.
7. A tube cleaner as defined in claim 2 wherein the flexible coil spring has an outer diameter between 80-90% of the inside diameter of the blocked tube.
8. A tube cleaner is defined in claim 2 wherein the flexible coil spring has a plug on the distal end thereof.
9. A tube cleaner as defined in claim 3 wherein the pressurized water gun supplies pressurized water at a pressure up to about 800 pounds/in2 to remove a blockage from a tube.
10. A tube cleaner for removing a blockage in a condenser tube, the blocked tube being part of an array of tubes and wherein a tube sheet provides access to the tubes through openings in the tube sheet in registry with the tubes, comprising:
(a) an anchor plate for mounting on the tube sheet, the anchor plate having a plurality of anchor plate openings therethrough in registry with openings in the tube sheet,
(b) at least one anchor plate fastener expandable at a position in the anchor plate opening, for securing the anchor plate to the tube sheet such that the blocked tube is in registry with another anchor plate opening in the anchor plate,
(c) a tube entry guide disposed on the anchor plate and extending toward the blocked tube,
(d) a quick disconnect connector, secured to the tube entry guide on the anchor plate, arranged to mount a tube cleaning apparatus with access to the blocked tube, and
(e) means for providing a driving force into the blocked tube to clean the blockage from the tube, engageable with quick disconnect connector on the anchor plate, comprising a flexible coil spring insertable into the blocked tube, the flexible coil spring operatively connected to a drive means to urge the flexible coil spring incrementally against the blockage to clean the blockage from the tube.
11. A tube cleaner as defined in claim 2 wherein the flexible coil spring has an outer diameter between 80-90% of the inside diameter of the blocked tube.
12. A tube cleaner for removing a blockage in a condenser tube, the blocked tube being part of an array of tubes wherein a tube sheet provides access to the tubes through openings in the tube sheet in registry with the tubes, comprising:
(a) an anchor plate for mounting on the tube sheet, the anchor plate having a plurality of anchor plate openings therethrough in registry with openings in the tube sheet,
(b) at least one anchor plate fastener expandable at a position in the anchor plate opening, for securing the anchor plate to the tube sheet such that the blocked tube is in registry with another anchor plate opening in the anchor plate,
(c) a tube entry guide disposed on the anchor plate and extending toward the blocked tube,
(d) a quick disconnect connector, secured to the tube entry guide on the anchor plate, arranged to mount a tube cleaning apparatus with access to the blocked tube, and
(e) means for providing a driving force into the blocked tube to clean the blockage from the tube, engageable with the quick disconnect connector on the anchor plate, comprising a pressurized water gun for supplying pressurized water to urge the blockage through the tube.
13. A tube cleaner as defined in claim 12 wherein the pressurized water gun supplies pressurized water at a pressure up to about 2000 pounds/in2 to remove a blockage from a tube.
14. A tube cleaner as defined in claim 12 wherein the pressurized water gun supplies pressurized water at a pressure in a range of about 800-2000 pounds/in2 to remove a blockage from a tube.
15. A method for removing a blockage in a heat exchanger tube being part of an array of tubes in a condenser and wherein a tube sheet provides access to the tubes through openings in the tube sheet in registry with the tubes, comprising:
mounting an anchor plate on the tube sheet, the anchor plate having a plurality of anchor plate openings therethrough in registry with openings in the tube sheet;
securing at least one anchor plate fastener to the tube sheet at an opening in the tube sheet such that the blocked tube is in registry with another anchor plate opening in the anchor plate;
mounting a tube cleaning apparatus on the anchor plate with access to the blocked tube through an anchor plate opening;
providing a driving force, through a driving force means engaged with the anchor plate, into the blocked tube to clear the blockage from the tube.
16. A method of removing a blockage in a tube as defined in claim 15 , wherein the driving force is provided by a flexible coil spring inserted into the blocked tube and wherein the flexible coil spring is operatively connected to a hydraulic drive, urging the flexible coil spring incrementally against the blockage to clear the blockage from the tube.
17. A method of removing a blockage in a tube as defined in claim 15 , wherein the driving force is provided by a pressurized water gun and pressurized water is supplied to urge the blockage through the tube.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/004,235 US20120175078A1 (en) | 2011-01-11 | 2011-01-11 | Heat exchanger tube cleaning apparatus and method of removing a blockage from a tube |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/004,235 US20120175078A1 (en) | 2011-01-11 | 2011-01-11 | Heat exchanger tube cleaning apparatus and method of removing a blockage from a tube |
Publications (1)
Publication Number | Publication Date |
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US20120175078A1 true US20120175078A1 (en) | 2012-07-12 |
Family
ID=46454343
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/004,235 Abandoned US20120175078A1 (en) | 2011-01-11 | 2011-01-11 | Heat exchanger tube cleaning apparatus and method of removing a blockage from a tube |
Country Status (1)
Country | Link |
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US (1) | US20120175078A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9739548B1 (en) | 2017-02-15 | 2017-08-22 | Equate Petrochemical Company | Hydro-blasting anti-withdrawal device support |
US20190264994A1 (en) * | 2018-02-28 | 2019-08-29 | Projectile Tube Cleaning, Inc. | Tube Cleaning Gun with Self-Sealing Nozzle |
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US3463527A (en) * | 1968-04-18 | 1969-08-26 | Us Army | Failsafe expandable bolt assembly |
US4315541A (en) * | 1978-09-06 | 1982-02-16 | Mitsui Toatsu Chemicals Incorporated | Device for scraping off deposits from internal surfaces of elongated tubes |
US5013368A (en) * | 1988-11-18 | 1991-05-07 | Compagnie De Raffinage Et De Distribution Total France | Method and device for cleaning a tube in which a fluid-circulates, and their use in heat-exchanger tubes |
US20070119007A1 (en) * | 2004-05-11 | 2007-05-31 | Gerald Minshall | Tube cleaning apparatus |
US7316430B2 (en) * | 2002-08-30 | 2008-01-08 | Cameron International Corporation | Connecting mechanism |
-
2011
- 2011-01-11 US US13/004,235 patent/US20120175078A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3463527A (en) * | 1968-04-18 | 1969-08-26 | Us Army | Failsafe expandable bolt assembly |
US4315541A (en) * | 1978-09-06 | 1982-02-16 | Mitsui Toatsu Chemicals Incorporated | Device for scraping off deposits from internal surfaces of elongated tubes |
US5013368A (en) * | 1988-11-18 | 1991-05-07 | Compagnie De Raffinage Et De Distribution Total France | Method and device for cleaning a tube in which a fluid-circulates, and their use in heat-exchanger tubes |
US7316430B2 (en) * | 2002-08-30 | 2008-01-08 | Cameron International Corporation | Connecting mechanism |
US20070119007A1 (en) * | 2004-05-11 | 2007-05-31 | Gerald Minshall | Tube cleaning apparatus |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US9739548B1 (en) | 2017-02-15 | 2017-08-22 | Equate Petrochemical Company | Hydro-blasting anti-withdrawal device support |
US20190264994A1 (en) * | 2018-02-28 | 2019-08-29 | Projectile Tube Cleaning, Inc. | Tube Cleaning Gun with Self-Sealing Nozzle |
US11236958B2 (en) * | 2018-02-28 | 2022-02-01 | Projectile Tube Cleaning, Inc. | Tube cleaning gun with self-sealing nozzle |
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Owner name: CONCO SYSTEMS, INC., PENNSYLVANIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SAXON, GREGORY J.;GODISH, ZACHARY J;HALL, JERRY F., JR.;AND OTHERS;REEL/FRAME:025726/0602 Effective date: 20110128 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |