US20090107888A1 - Tube handling method and apparatus - Google Patents
Tube handling method and apparatus Download PDFInfo
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- US20090107888A1 US20090107888A1 US11/978,297 US97829707A US2009107888A1 US 20090107888 A1 US20090107888 A1 US 20090107888A1 US 97829707 A US97829707 A US 97829707A US 2009107888 A1 US2009107888 A1 US 2009107888A1
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- Prior art keywords
- tube
- furnace
- bed
- cable
- opposing ends
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M5/00—Casings; Linings; Walls
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M20/00—Details of combustion chambers, not otherwise provided for, e.g. means for storing heat from flames
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F11/00—Arrangements for sealing leaky tubes and conduits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/007—Auxiliary supports for elements
- F28F9/013—Auxiliary supports for elements for tubes or tube-assemblies
Definitions
- This invention relates to the insertion and/or extraction of a length of tube (pipe) into/from its resting place in a holding apparatus. More particularly this invention relates to the removal of a length of heat exchange tube from a furnace and the insertion of a replacement tube in place of the removed tube.
- this invention will be described in relation to a conventional thermal cracking furnace, this invention is applicable to other apparatus that holds one or more lengths of piping (conduit) at an elevated location above the earth's surface, and, with respect to which apparatus, it is necessary from time to time to remove and replace a length of that piping.
- Thermal cracking of hydrocarbons is a petrochemical process that is widely used to produce olefins such as ethylene, propylene, butenes, butadiene, and aromatics such as benzene, toluene, and xylenes.
- An olefin production plant is generally composed of a cracking unit and a hydrocarbons unit.
- a hydrocarbonaceous feedstock such as ethane, naphtha, gas oil, or other fractions of whole crude oil is mixed with steam which serves as a diluent to keep the hydrocarbon molecules separated.
- This mixture after preheating, is subjected to hydrocarbon thermal cracking using elevated temperatures (1,450 to 1,550 degrees Fahrenheit or F.) in a pyrolysis furnace (steam cracker or cracker). This thermal cracking process is carried out without the aid of any catalyst.
- the cracked product effluent of the pyrolysis furnace contains hot, gaseous hydrocarbons of great variety (from 1 to 35 carbon atoms per molecule, or C1 to C35 inclusive, both saturated and unsaturated).
- This product contains aliphatics (alkanes and alkenes), alicyclics (cyclanes, cyclenes, and cyclodienes), aromatics, and molecular hydrogen (hydrogen).
- This furnace product is then subjected to further processing in the cracking unit to produce, as products of the olefin plant, various, separate and individual product streams such as hydrogen, ethylene, propylene, fuel oil, and pyrolysis gasoline. After the separation of these individual streams, the remaining cracked product contains essentially C4 hydrocarbons and heavier. This remainder is fed to a debutanizer wherein a crude C4 stream is separated as overhead while a C5 and heavier stream is removed as a bottoms product.
- various, separate and individual product streams such as hydrogen, ethylene, propylene, fuel oil, and pyrolysis gasoline.
- the C4 stream can contain varying amounts of n-butane, isobutane, 1-butene, 2-butenes (both cis and trans isomers), isobutylene, acetylenes, and diolefins such as butadiene (both cis and trans isomers).
- the C5 stream can contain pentanes, pentenes, hexanes, hexenes, and aromatics such as benzene, toluene, and xylenes.
- the C4 and C5 streams are further processed in the hydrocarbons unit for the separation of other individual product streams such as butenes, butadiene, benzene, toluene, and the like.
- furnaces are well known, and are composed of a lower, upstanding radiant heating (cracking) section surmounted by an upper, upstanding convection (preheating) heating section. These two sections are connected in a fluid communication manner by way of an offset (cross-over) section that conveys hot combustion gases (flue gas) from the interior of the radiant section up through the cross-over into the interior of the convection section without exposing the interior of the convection section to radiant heating.
- offset (cross-over) section that conveys hot combustion gases (flue gas) from the interior of the radiant section up through the cross-over into the interior of the convection section without exposing the interior of the convection section to radiant heating.
- furnaces are hundreds of feet in height, so the convection section is elevated a substantial distance, e.g., 100 feet or more, above the surface of the earth.
- the radiant section and convection section each contains a sinusoidal series of spaced apart, straight, elongate tube lengths.
- the elongate tube lengths are oriented essentially vertically in the radiant section, and essentially horizontally in the convection section.
- the elongate tubes were initially individual tubes that were joined to one another at their opposing ends with 180 degree U-tube fittings known as “bends,” see FIG. 5 .
- a U-tube bend connects two side-by-side (adjacent) individual pieces of elongate tubes at their upper adjacent ends thereby to establish fluid communication from inside one tube to inside the adjacent tube.
- additional U-bends connect each tube to the lower end of an adjacent tube.
- a plurality of straight, elongate tubes are connected to one another to form a sinusoidal assemblage of straight tubes connected by U-bends.
- feed material introduced into a first end of the radiant tube assembly follows a unitary sinusoidal path through the interior of the assembly (all the tubes and connecting bends) until it reaches the far end of the assembly, at which time it exits the assembly as the cracked product effluent aforesaid.
- this invention is useful in removing and inserting not only horizontal tube lengths, but also vertical tube lengths that have first been moved to a horizontal orientation.
- This invention is particularly useful in removing and inserting convection section tubes that are already disposed in the furnace in an essentially horizontal orientation.
- the cracking feed passing through the interior of the sinusoidal radiant tubing assembly is indirectly heated by way of burners fired inside the radiant section of the furnace, but outside the radiant tubing assembly.
- the radiant tubing assembly is exposed to the flames from these burners, and is thereby heated to the desired cracking temperature for the particular cracking feed that is passing through the inside of this tubing assembly.
- Hot combustion gas passes from inside the radiant section, through the cross-over, and into the interior of the convection section wherein it indirectly preheats the cracking feed passing through the interior of the convection section tubing assembly.
- the convection tubes are supported by a pair of cradles that are spaced apart along the length of the tube. These cradles are fixed to the furnace itself so that an individual piece of tubing, once freed of the U-bends that were fixed to its opposing ends, can be slipped out of its cradle, and a new piece of tubing inserted into that same cradle. Since an individual length of tubing can be essentially a carbon steel pipe 30 feet in length, the trick is to deftly and safely remove and replace such a long, heavy object from a location high up in the air.
- This invention provides an admirable solution for this problematic mid-air procedure.
- This invention provides apparatus whereby the length of worn tubing is pulled from its cradle on to a suspended platform that carries a lattice work support holding a reversible cable drawing mechanism, a part of the lattice work support being removable to allow the apparatus to be deployed around existing equipment that would otherwise prevent the apparatus from being used in the intended manner.
- This invention also provides methods for extracting and inserting a tube length using the aforesaid apparatus while suspended high above the earth's surface.
- FIG. 1 shows a plan view of one embodiment of apparatus within this invention.
- FIG. 2 shows a side view of the apparatus of FIG. 1 .
- FIG. 3 shows an end view of the apparatus of FIG. 1 .
- FIG. 4 shows an end view of the apparatus of FIG. 1 with a portion of its lattice work support removed to avoid interfering equipment.
- FIG. 5 shows a side view of the apparatus of FIG. 1 when used, pursuant to the method of this invention, to extract a worn tube length from its holding cradles.
- FIG. 6 shows a side view of the apparatus of FIG. 1 when used, pursuant to the method of this invention, to insert a tube length into its holding cradles.
- FIG. 7 shows a plan view of the apparatus of FIG. 6 .
- FIG. 1 shows platform assembly 1 having an elongate, open bed 2 whose upper surface is shown in this Figure.
- This bed 2 can be, for example, a wide-flange I-beam having a 24 inch web width and 7 inch deep sides (sides 3 and 4 of this Figure) on the opposing longitudinal sides of the web.
- the web of the I-beam can be 24 inches wide and 40 feet long in order to accommodate furnace tubes having a longitudinal length of at least 30 feet.
- the upstanding, opposing sides 3 and 4 of bed 2 i.e., the 7 inch deep sides of the I-beam, have their upper surfaces showing in this Figure.
- Platform 1 has opposing ends 9 and 10 at which are carried, in apertures 5 and 6 , rotating sheaves 7 and 8 so that a cable (rope, steel, or otherwise) can be passed through apertures 5 and 6 from below the lower surface of bed 2 (see FIG. 2 ) to its upper surface that is shown in this Figure.
- a cable rope, steel, or otherwise
- Platform 1 also carries spaced apart, transverse members 16 and 17 that extend beyond both sides of bed 2 and terminate in platform lifting lugs 14 .
- Lugs 14 are used to lift the entire assembly into the air by way of cables attached to each such lug (see FIG. 2 ) and to the lifting cable of a conventional crane.
- Platform 1 carries an extension member 11 on the under side 23 of bed 2 .
- Normally end 10 of platform 1 will be moved into abutment with the outside of the furnace (not shown, see FIG. 5 ) from which a tube is to be extracted.
- extension 11 and its end 12 can be moved longitudinally away from end 10 until far end 12 contacts the outside wall of the furnace.
- Normally extension 11 is carried entirely under bed 2 against stop 15 , and is pinned in place in a conventional manner.
- FIG. 2 shows member 11 partly extended for explanation purposes only.
- a series of apertures can be employed in member 11 to provide flexibility in the length of extension to be employed. Once the desired length is determined for extension 11 , these apertures can be used to pin or otherwise fix member 11 in its extended configuration.
- Upstanding sides 3 and 4 carry front and back guide lugs 13 to which can be attached cables for guiding platform 1 from the earth's surface. This way end 10 can be gently and precisely guided into contact with the outer furnace wall by personnel standing on the earth's surface.
- Platform 1 also carries an operating mechanism for controlling the draw works shown in FIG. 2 .
- This mechanism is represented by elements 32 , 33 , 35 , and 36 which will be described in greater detail hereinafter.
- the operator can stand on scaffolding adjacent the suspended platform 1 after it has been moved into place against the furnace. The operator will stand within arms reach of element 33 .
- FIG. 2 shows that bed 2 of platform 1 has a lower surface 23 opposing its upper surface. Apertures 5 and 6 , and sheaves 7 and 8 extend through this bed. Sheaves 7 and 8 are shown in exaggerated form for sake of clarity. In actuality, sheaves 7 and 8 would not extend as far above bed 2 and below surface 23 as shown in the Figure.
- FIG. 2 shows lifting lugs 14 to have apertures 20 extending there through for the attachment of lifting cables 21 to the main cable of the crane that is to lift platform 1 up and into contact with the outer wall of the furnace (not shown, see FIG. 5 ).
- Side 4 carries a lattice work support system composed of floor 25 ; upstanding members 24 , 37 , 38 , and 39 ; and re-enforcing cross-members 18 , 19 , 46 , and 47 .
- Bed 2 is substantially longer than the lattice work support system so that the length of bed 2 at its end 10 extends well beyond the end 39 of the lattice work support system. This way the cantilevered part of bed 2 having an end at 10 can extend over interfering equipment that is adjacent to the outer wall of the furnace.
- Bed 2 can be re-enforced as desired to allow the cantilevering of bed 2 a substantial distance beyond the ends of this lattice work support system.
- Motor 26 can be any means for rotating drum 27 in either a clockwise or counterclockwise manner, as desired.
- motor 26 could be an internal combustion engine, an electric motor, or a fluid (air, hydraulic, etc.) driven motor.
- motor 26 will be a pneumatic driven device since plant compressed air is normally available at the furnace.
- Compressed air 34 is passed from the plant into hose 31 which is connected to an emergency cut off switch 30 that is within arms length of the operator.
- Hose 29 connects this air supply to motor 26 through standard connection chuck 28 .
- Mechanical linkage 32 extends from handle 33 adjacent the operator to a conventional control mechanism (not shown) on motor 26 . By movement of linkage 32 either forward or backward, as desired, the operator can engage motor 26 with drum 27 to cause that drum to rotate in the desired direction and roll cable (not shown, see FIGS. 5 and 6 ) onto the drum. Reverse movement of linkage 32 disengages motor 26 from drum 27 causing the drum to stop its rotation.
- the linkage to the motor can vary widely, and can be electrical or fluid driven rather than mechanical, if desired. The linkage shown in FIG.
- Rod assembly 32 that can be moved forward or backward along side 4 toward or away from motor 26 to activate or de-activate that motor.
- Linkage 32 is held along side 4 by way of a plurality of eye members 36 fixed to side 4 .
- a hinge 35 is provided so handle 33 can be moved by the operator away from side 4 .
- FIG. 3 shows an end view of platform 1 looking towards end 10 thereof, i.e., the end the furnace wall would see.
- certain elements shown in FIGS. 1 and 2 are not shown only for the sake of clarity, and the elements not shown are to be considered to be part of the apparatus shown in FIGS. 3 through 7 .
- FIG. 3 shows drum 27 carrying cable 40 rolled thereon.
- Cable 40 is used to remove or insert a tube length relative to the furnace.
- Drum 40 is conventionally supported in a rotatable manner by members 42 and 43 , and is linked by way of drive chain 45 to drive shaft 44 of motor 26 as is well known in the art.
- Other forms of draw works arrangements are well known in the art and are within the scope of this invention.
- FIG. 3 further shows the construction of the supporting lattice work of FIG. 2 .
- Upstanding members 50 and 51 of this lattice work support are fixed (welded, bolted, riveted, etc.) to member 17 , sides 3 and 4 of web 2 , and floor 25 .
- Members 52 and 53 are fixed to member 17 , and carry flanges 54 and 56 , respectively.
- Upstanding members 58 and 59 are fixed to floor extension members 60 and 61 , and are re-enforced by cross-members 66 and 67 .
- Members 58 and 59 carry, respectively, bolt flanges 55 and 57 that mate with bolt flanges 54 and 56 .
- Members 60 and 61 carry, respectively, bolt flanges 62 and 65 that mate with bolt flanges 63 and 64 .
- Flanges 63 and 64 are carried by extensions 68 and 69 of floor 25 .
- FIG. 4 shows the apparatus of FIG. 3 wherein the sub-assembly represented by elements 58 and 60 has been removed in its entirety to allow platform 1 to be moved alongside of interfering elongate pipe 70 . This way platform 1 can be moved into physical contact with the furnace (not shown, see FIG. 5 ) with out having to remove pipe 70 .
- This Figure also shows the sub-assembly represented by elements 59 and 61 while in the process of being removed from the lattice work support, as shown by arrow 48 , to allow that side of platform 1 also to avoid another piece of interfering equipment (not shown).
- the U-bends on either end of a worn length of pipe to be removed from the furnace are themselves separated from that length of worn pipe and the pipes adjacent (over and under) to the worn pipe.
- a section of the outer wall of the furnace adjacent the worn pipe is removed to form an opening in the furnace wall.
- Platform 1 is then raised by a crane into place along side and in abutment with the furnace just below this opening, and in longitudinal alignment with the worn pipe to be removed.
- Cable 40 is passed from drum 27 under bottom surface 23 , around sheave 7 , over web 2 , and fixed to the nearest end of the worn pipe.
- the operator then activates motor 26 to re-wind cable 40 onto drum 27 thereby extracting the worn pipe from its cradles and on to the upper surface of bed 2 .
- platform 1 is lowered to the earth's surface for disposal of the worn length of pipe.
- the process is then reversed in that a new length of pipe is disposed on the upper surface of bed 2 , and platform 1 raised back to where the worn pipe was earlier removed.
- cable 40 is passed around sheave 8 and attached to the end of the new pipe that is furthest from the furnace.
- the operator then activates motor 26 to re-wind cable 40 onto drum 27 thereby pulling the new pipe into the cradles from which the worn pipe was removed.
- the U-bends that were earlier removed are re-attached to the new pipe and its adjacent pipe lengths.
- FIG. 5 shows platform 1 when that platform is in place against the outer wall 74 of the furnace, and in the process of removing a worn pipe length 76 from the interior of the furnace.
- Downwardly extending U-bend 71 was earlier removed from pipe 76 and from its adjacent lower pipe 72 that is supported by its own cradles, e.g., cradle 73 .
- An upwardly extending U-bend (not shown) similar to bend 71 was also earlier removed from end 84 of pipe 76 and from its adjacent upper pipe (not shown). This leaves pipe 76 resting in an unattached manner in its support cradles 75 and 77 .
- Cable 40 has been passed under bottom 23 through aperture 5 , around sheave 7 , and along the upper surface of bed 2 to end 74 of pipe 76 .
- An aperture 78 is formed through pipe 76 and a clevis 79 fixed therein.
- Cable 40 is looped at 80 through clevis 79 and fixed to itself by a cable clamp 81 .
- the operator activates motor 26 to turn drum 27 clockwise and re-wind cable 40 onto drum 27 thereby pulling tube 76 out of cradles 75 and 77 , as shown by arrow 82 , and on to surface 2 .
- platform 1 is lowered to the earth's surface for removal of pipe 76 there from.
- FIG. 6 shows platform 1 when in the process of installing a new length of pipe 85 in the cradles 75 and 76 that were vacated by the method shown in FIG. 5 .
- cable 40 is passed below bottom 23 through aperture 6 , around sheave 8 , and over the upper surface of bed 2 to the far end of new pipe 85 where it is fixed to a strap 86 that is wrapped around the outer periphery of pipe 85 .
- the operator activates motor 26 to turn drum 27 clockwise and re-wind cable 40 onto drum 27 thereby pulling pipe 85 off of bed 2 and through the vacated apertures 88 and 89 in cradles 75 and 76 , respectively, as shown by arrow 87 .
- the U-bends that were earlier removed from worn pipe 76 are attached to new pipe 85 and its adjacent upper and lower pipes in sinusoidal form.
- FIG. 7 shows a top view of platform 1 when in use as shown in FIG. 6 .
- This Figure better shows that strap 86 is wrapped at least twice around the outer periphery of pipe 85 .
- Cable 40 is looped around one of the strap wraps 86 and then clamped to itself by a cable clamp 89 . This way, when cable 40 is drawn downwardly around sheave 8 by operation of motor 26 , pipe 85 is pulled toward cradle 75 as shown by arrow 87 .
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- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
Description
- 1. Field of the Invention
- This invention relates to the insertion and/or extraction of a length of tube (pipe) into/from its resting place in a holding apparatus. More particularly this invention relates to the removal of a length of heat exchange tube from a furnace and the insertion of a replacement tube in place of the removed tube.
- 2. Description of the Prior Art
- Although for sake of brevity and clarity this invention will be described in relation to a conventional thermal cracking furnace, this invention is applicable to other apparatus that holds one or more lengths of piping (conduit) at an elevated location above the earth's surface, and, with respect to which apparatus, it is necessary from time to time to remove and replace a length of that piping.
- Thermal cracking of hydrocarbons is a petrochemical process that is widely used to produce olefins such as ethylene, propylene, butenes, butadiene, and aromatics such as benzene, toluene, and xylenes.
- An olefin production plant is generally composed of a cracking unit and a hydrocarbons unit.
- In the cracking unit a hydrocarbonaceous feedstock such as ethane, naphtha, gas oil, or other fractions of whole crude oil is mixed with steam which serves as a diluent to keep the hydrocarbon molecules separated. This mixture, after preheating, is subjected to hydrocarbon thermal cracking using elevated temperatures (1,450 to 1,550 degrees Fahrenheit or F.) in a pyrolysis furnace (steam cracker or cracker). This thermal cracking process is carried out without the aid of any catalyst.
- The cracked product effluent of the pyrolysis furnace (furnace) contains hot, gaseous hydrocarbons of great variety (from 1 to 35 carbon atoms per molecule, or C1 to C35 inclusive, both saturated and unsaturated). This product contains aliphatics (alkanes and alkenes), alicyclics (cyclanes, cyclenes, and cyclodienes), aromatics, and molecular hydrogen (hydrogen).
- This furnace product is then subjected to further processing in the cracking unit to produce, as products of the olefin plant, various, separate and individual product streams such as hydrogen, ethylene, propylene, fuel oil, and pyrolysis gasoline. After the separation of these individual streams, the remaining cracked product contains essentially C4 hydrocarbons and heavier. This remainder is fed to a debutanizer wherein a crude C4 stream is separated as overhead while a C5 and heavier stream is removed as a bottoms product.
- The C4 stream can contain varying amounts of n-butane, isobutane, 1-butene, 2-butenes (both cis and trans isomers), isobutylene, acetylenes, and diolefins such as butadiene (both cis and trans isomers).
- The C5 stream can contain pentanes, pentenes, hexanes, hexenes, and aromatics such as benzene, toluene, and xylenes.
- The C4 and C5 streams are further processed in the hydrocarbons unit for the separation of other individual product streams such as butenes, butadiene, benzene, toluene, and the like.
- The heart of the cracking plant process is the pyrolysis furnace (furnace). Such furnaces are well known, and are composed of a lower, upstanding radiant heating (cracking) section surmounted by an upper, upstanding convection (preheating) heating section. These two sections are connected in a fluid communication manner by way of an offset (cross-over) section that conveys hot combustion gases (flue gas) from the interior of the radiant section up through the cross-over into the interior of the convection section without exposing the interior of the convection section to radiant heating. These furnaces are hundreds of feet in height, so the convection section is elevated a substantial distance, e.g., 100 feet or more, above the surface of the earth.
- The radiant section and convection section each contains a sinusoidal series of spaced apart, straight, elongate tube lengths. The elongate tube lengths are oriented essentially vertically in the radiant section, and essentially horizontally in the convection section. The elongate tubes were initially individual tubes that were joined to one another at their opposing ends with 180 degree U-tube fittings known as “bends,” see
FIG. 5 . Thus, for example, in the radiant section, a U-tube bend connects two side-by-side (adjacent) individual pieces of elongate tubes at their upper adjacent ends thereby to establish fluid communication from inside one tube to inside the adjacent tube. At the opposing lower ends of these two tubes, additional U-bends connect each tube to the lower end of an adjacent tube. By use of the U-bends, a plurality of straight, elongate tubes are connected to one another to form a sinusoidal assemblage of straight tubes connected by U-bends. This way, feed material introduced into a first end of the radiant tube assembly follows a unitary sinusoidal path through the interior of the assembly (all the tubes and connecting bends) until it reaches the far end of the assembly, at which time it exits the assembly as the cracked product effluent aforesaid. - Although, in the case of a cracking furnace, the elongate tubes in the radiant section assembly are normally carried inside the furnace in an essentially vertical orientation, while the elongate tubes in the convection section assembly are carried in an essentially horizontal orientation, this invention is useful in removing and inserting not only horizontal tube lengths, but also vertical tube lengths that have first been moved to a horizontal orientation. This invention is particularly useful in removing and inserting convection section tubes that are already disposed in the furnace in an essentially horizontal orientation.
- The cracking feed passing through the interior of the sinusoidal radiant tubing assembly is indirectly heated by way of burners fired inside the radiant section of the furnace, but outside the radiant tubing assembly. The radiant tubing assembly is exposed to the flames from these burners, and is thereby heated to the desired cracking temperature for the particular cracking feed that is passing through the inside of this tubing assembly.
- Hot combustion gas passes from inside the radiant section, through the cross-over, and into the interior of the convection section wherein it indirectly preheats the cracking feed passing through the interior of the convection section tubing assembly.
- From time to time an individual length of elongate tube in the convection section assembly becomes plugged, corroded, or otherwise degraded to the point where it is necessary to replace that length of tube even though the horizontal elongate tubes adjacent (over and/or under) to the worn tube do not require replacement. When this occurs, the U-bends at either end of the worn length of tube must be removed, the worn length extracted from inside the furnace, a new tube length inserted into the furnace in place of the worn length, and the U-bends re-attached to the new length and its adjacent (over and under) lengths of tubing. This procedure has to be accomplished hundreds of feet in the air.
- The convection tubes are supported by a pair of cradles that are spaced apart along the length of the tube. These cradles are fixed to the furnace itself so that an individual piece of tubing, once freed of the U-bends that were fixed to its opposing ends, can be slipped out of its cradle, and a new piece of tubing inserted into that same cradle. Since an individual length of tubing can be essentially a
carbon steel pipe 30 feet in length, the trick is to deftly and safely remove and replace such a long, heavy object from a location high up in the air. - This invention provides an admirable solution for this problematic mid-air procedure.
- This invention provides apparatus whereby the length of worn tubing is pulled from its cradle on to a suspended platform that carries a lattice work support holding a reversible cable drawing mechanism, a part of the lattice work support being removable to allow the apparatus to be deployed around existing equipment that would otherwise prevent the apparatus from being used in the intended manner.
- This invention also provides methods for extracting and inserting a tube length using the aforesaid apparatus while suspended high above the earth's surface.
-
FIG. 1 shows a plan view of one embodiment of apparatus within this invention. -
FIG. 2 shows a side view of the apparatus ofFIG. 1 . -
FIG. 3 shows an end view of the apparatus ofFIG. 1 . -
FIG. 4 shows an end view of the apparatus ofFIG. 1 with a portion of its lattice work support removed to avoid interfering equipment. -
FIG. 5 shows a side view of the apparatus ofFIG. 1 when used, pursuant to the method of this invention, to extract a worn tube length from its holding cradles. -
FIG. 6 shows a side view of the apparatus ofFIG. 1 when used, pursuant to the method of this invention, to insert a tube length into its holding cradles. -
FIG. 7 shows a plan view of the apparatus ofFIG. 6 . -
FIG. 1 shows platform assembly 1 having an elongate,open bed 2 whose upper surface is shown in this Figure. Thisbed 2 can be, for example, a wide-flange I-beam having a 24 inch web width and 7 inch deep sides (sides bed 2, the web of the I-beam, can be 24 inches wide and 40 feet long in order to accommodate furnace tubes having a longitudinal length of at least 30 feet. The upstanding, opposingsides bed 2, i.e., the 7 inch deep sides of the I-beam, have their upper surfaces showing in this Figure. - Platform 1 has
opposing ends apertures sheaves apertures FIG. 2 ) to its upper surface that is shown in this Figure. - Platform 1 also carries spaced apart,
transverse members bed 2 and terminate inplatform lifting lugs 14.Lugs 14 are used to lift the entire assembly into the air by way of cables attached to each such lug (seeFIG. 2 ) and to the lifting cable of a conventional crane. - Platform 1 carries an
extension member 11 on the underside 23 ofbed 2. Normallyend 10 of platform 1 will be moved into abutment with the outside of the furnace (not shown, seeFIG. 5 ) from which a tube is to be extracted. However, if existing equipment outside the furnace prevents the movement ofend 10 into physical contact with the outside wall of the furnace,extension 11 and itsend 12 can be moved longitudinally away fromend 10 until far end 12 contacts the outside wall of the furnace. Normallyextension 11 is carried entirely underbed 2 againststop 15, and is pinned in place in a conventional manner.FIG. 2 showsmember 11 partly extended for explanation purposes only. A series of apertures (not shown) can be employed inmember 11 to provide flexibility in the length of extension to be employed. Once the desired length is determined forextension 11, these apertures can be used to pin or otherwise fixmember 11 in its extended configuration. -
Upstanding sides - Platform 1 also carries an operating mechanism for controlling the draw works shown in
FIG. 2 . This mechanism is represented byelements element 33. -
FIG. 2 shows thatbed 2 of platform 1 has alower surface 23 opposing its upper surface. Apertures 5 and 6, andsheaves Sheaves bed 2 and belowsurface 23 as shown in the Figure. -
FIG. 2 shows lifting lugs 14 to haveapertures 20 extending there through for the attachment of liftingcables 21 to the main cable of the crane that is to lift platform 1 up and into contact with the outer wall of the furnace (not shown, seeFIG. 5 ). -
Side 4 carries a lattice work support system composed offloor 25;upstanding members re-enforcing cross-members floor 25, a conventional cable draw works composed ofmotor 26 which is operably connected to acable wind drum 27.Bed 2 is substantially longer than the lattice work support system so that the length ofbed 2 at itsend 10 extends well beyond theend 39 of the lattice work support system. This way the cantilevered part ofbed 2 having an end at 10 can extend over interfering equipment that is adjacent to the outer wall of the furnace.Bed 2 can be re-enforced as desired to allow the cantilevering of bed 2 a substantial distance beyond the ends of this lattice work support system. -
Motor 26 can be any means for rotatingdrum 27 in either a clockwise or counterclockwise manner, as desired. Thus,motor 26 could be an internal combustion engine, an electric motor, or a fluid (air, hydraulic, etc.) driven motor. For sake of thisdescription motor 26 will be a pneumatic driven device since plant compressed air is normally available at the furnace. -
Compressed air 34 is passed from the plant intohose 31 which is connected to an emergency cut offswitch 30 that is within arms length of the operator.Hose 29 connects this air supply tomotor 26 throughstandard connection chuck 28.Mechanical linkage 32 extends fromhandle 33 adjacent the operator to a conventional control mechanism (not shown) onmotor 26. By movement oflinkage 32 either forward or backward, as desired, the operator can engagemotor 26 withdrum 27 to cause that drum to rotate in the desired direction and roll cable (not shown, seeFIGS. 5 and 6 ) onto the drum. Reverse movement oflinkage 32 disengages motor 26 fromdrum 27 causing the drum to stop its rotation. The linkage to the motor can vary widely, and can be electrical or fluid driven rather than mechanical, if desired. The linkage shown inFIG. 2 is arod assembly 32 that can be moved forward or backward alongside 4 toward or away frommotor 26 to activate or de-activate that motor.Linkage 32 is held alongside 4 by way of a plurality ofeye members 36 fixed toside 4. Ahinge 35 is provided so handle 33 can be moved by the operator away fromside 4. -
FIG. 3 shows an end view of platform 1 looking towardsend 10 thereof, i.e., the end the furnace wall would see. In this Figure and the remaining Figures, certain elements shown inFIGS. 1 and 2 are not shown only for the sake of clarity, and the elements not shown are to be considered to be part of the apparatus shown inFIGS. 3 through 7 . -
FIG. 3 shows drum 27 carryingcable 40 rolled thereon.Cable 40 is used to remove or insert a tube length relative to the furnace.Drum 40 is conventionally supported in a rotatable manner bymembers drive chain 45 to driveshaft 44 ofmotor 26 as is well known in the art. Other forms of draw works arrangements are well known in the art and are within the scope of this invention. -
FIG. 3 further shows the construction of the supporting lattice work ofFIG. 2 .Upstanding members member 17,sides web 2, andfloor 25.Members member 17, and carryflanges Upstanding members floor extension members cross-members Members bolt flanges bolt flanges Members bolt flanges bolt flanges Flanges extensions floor 25. By this arrangement, the lower, elongate, corner sub-assemblies represented, in brief, byelements elements member 38 to member 39 (seeFIG. 2 ) are removably attached to the overall lattice work support system shown inFIGS. 2 and 3 . -
FIG. 4 shows the apparatus ofFIG. 3 wherein the sub-assembly represented byelements elongate pipe 70. This way platform 1 can be moved into physical contact with the furnace (not shown, seeFIG. 5 ) with out having to removepipe 70. This Figure also shows the sub-assembly represented byelements arrow 48, to allow that side of platform 1 also to avoid another piece of interfering equipment (not shown). - In operation, the U-bends on either end of a worn length of pipe to be removed from the furnace are themselves separated from that length of worn pipe and the pipes adjacent (over and under) to the worn pipe. A section of the outer wall of the furnace adjacent the worn pipe is removed to form an opening in the furnace wall. Platform 1 is then raised by a crane into place along side and in abutment with the furnace just below this opening, and in longitudinal alignment with the worn pipe to be removed.
Cable 40 is passed fromdrum 27 underbottom surface 23, aroundsheave 7, overweb 2, and fixed to the nearest end of the worn pipe. The operator then activatesmotor 26 to re-windcable 40 ontodrum 27 thereby extracting the worn pipe from its cradles and on to the upper surface ofbed 2. Thereafter, platform 1 is lowered to the earth's surface for disposal of the worn length of pipe. The process is then reversed in that a new length of pipe is disposed on the upper surface ofbed 2, and platform 1 raised back to where the worn pipe was earlier removed. This time,cable 40 is passed aroundsheave 8 and attached to the end of the new pipe that is furthest from the furnace. The operator then activatesmotor 26 to re-windcable 40 ontodrum 27 thereby pulling the new pipe into the cradles from which the worn pipe was removed. Thereafter the U-bends that were earlier removed are re-attached to the new pipe and its adjacent pipe lengths. -
FIG. 5 shows platform 1 when that platform is in place against theouter wall 74 of the furnace, and in the process of removing aworn pipe length 76 from the interior of the furnace. Downwardly extending U-bend 71 was earlier removed frompipe 76 and from its adjacentlower pipe 72 that is supported by its own cradles, e.g.,cradle 73. An upwardly extending U-bend (not shown) similar to bend 71 was also earlier removed fromend 84 ofpipe 76 and from its adjacent upper pipe (not shown). This leavespipe 76 resting in an unattached manner in its support cradles 75 and 77.Cable 40 has been passed under bottom 23 throughaperture 5, aroundsheave 7, and along the upper surface ofbed 2 to end 74 ofpipe 76. Anaperture 78 is formed throughpipe 76 and aclevis 79 fixed therein.Cable 40 is looped at 80 throughclevis 79 and fixed to itself by acable clamp 81. By movement oflinkage 32, the operator activatesmotor 26 to turndrum 27 clockwise andre-wind cable 40 ontodrum 27 thereby pullingtube 76 out ofcradles arrow 82, and on tosurface 2. Thereafter platform 1 is lowered to the earth's surface for removal ofpipe 76 there from. -
FIG. 6 shows platform 1 when in the process of installing a new length ofpipe 85 in thecradles FIG. 5 . In the installation method,cable 40 is passed below bottom 23 throughaperture 6, aroundsheave 8, and over the upper surface ofbed 2 to the far end ofnew pipe 85 where it is fixed to astrap 86 that is wrapped around the outer periphery ofpipe 85. By movement oflinkage 32, the operator activatesmotor 26 to turndrum 27 clockwise andre-wind cable 40 ontodrum 27 thereby pullingpipe 85 off ofbed 2 and through the vacatedapertures cradles arrow 87. Thereafter the U-bends that were earlier removed from wornpipe 76 are attached tonew pipe 85 and its adjacent upper and lower pipes in sinusoidal form. -
FIG. 7 shows a top view of platform 1 when in use as shown inFIG. 6 . This Figure better shows that strap 86 is wrapped at least twice around the outer periphery ofpipe 85.Cable 40 is looped around one of the strap wraps 86 and then clamped to itself by acable clamp 89. This way, whencable 40 is drawn downwardly aroundsheave 8 by operation ofmotor 26,pipe 85 is pulled towardcradle 75 as shown byarrow 87. - Thus, it can be seen that the apparatus of this invention with its
cantilevered bed 2, removable sub-assemblies, andextension 11 provides unparalleled flexibility for maneuvering platform 1 around, over and under various and sundry equipment that is invariably located along the height and breadth of a furnace.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US11/978,297 US20090107888A1 (en) | 2007-10-29 | 2007-10-29 | Tube handling method and apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US11/978,297 US20090107888A1 (en) | 2007-10-29 | 2007-10-29 | Tube handling method and apparatus |
Publications (1)
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US20090107888A1 true US20090107888A1 (en) | 2009-04-30 |
Family
ID=40581449
Family Applications (1)
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US11/978,297 Abandoned US20090107888A1 (en) | 2007-10-29 | 2007-10-29 | Tube handling method and apparatus |
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US (1) | US20090107888A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140251785A1 (en) * | 2013-03-07 | 2014-09-11 | Foster Wheeler Usa Corporation | Method and system for utilizing materials of differing thermal properties to increase furnace run length |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6528027B1 (en) * | 1997-05-13 | 2003-03-04 | Stone & Webster Process Technology, Inc. | Cracking furance having radiant heating tubes the inlet and outlet legs of which are paired within the firebox |
US7964091B2 (en) * | 2004-02-05 | 2011-06-21 | Technip France | Cracking furnace |
-
2007
- 2007-10-29 US US11/978,297 patent/US20090107888A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6528027B1 (en) * | 1997-05-13 | 2003-03-04 | Stone & Webster Process Technology, Inc. | Cracking furance having radiant heating tubes the inlet and outlet legs of which are paired within the firebox |
US7964091B2 (en) * | 2004-02-05 | 2011-06-21 | Technip France | Cracking furnace |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140251785A1 (en) * | 2013-03-07 | 2014-09-11 | Foster Wheeler Usa Corporation | Method and system for utilizing materials of differing thermal properties to increase furnace run length |
US9850431B2 (en) * | 2013-03-07 | 2017-12-26 | Amec Foster Wheeler Usa Corporation | Method and system for utilizing materials of differing thermal properties to increase furnace run length |
US10557087B2 (en) | 2013-03-07 | 2020-02-11 | Amec Foster Wheeler Usa Corporation | Method and system for utilizing materials of differing thermal properties to increase furnace run length |
US10889759B2 (en) | 2013-03-07 | 2021-01-12 | Amec Foster Wheeler Usa Corporation | Method and system for utilizing materials of differing thermal properties to increase furnace run length |
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