CA1261692A - Heat exchanger tube bundle protection apparatus - Google Patents
Heat exchanger tube bundle protection apparatusInfo
- Publication number
- CA1261692A CA1261692A CA000493437A CA493437A CA1261692A CA 1261692 A CA1261692 A CA 1261692A CA 000493437 A CA000493437 A CA 000493437A CA 493437 A CA493437 A CA 493437A CA 1261692 A CA1261692 A CA 1261692A
- Authority
- CA
- Canada
- Prior art keywords
- heat exchanger
- tubes
- cylindrical members
- opening
- protecting means
- 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.)
- Expired
Links
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- Details Of Heat-Exchange And Heat-Transfer (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
ABSTRACT OF THE INVENTION
The heat exchanger tube bundle fluid entry area is a region where particular problems can occur because pieces of metallic debris can collect and focus their mass at this low elevation. The metallic debris collected at the bottom of the annular down-comer passage can be swept into the tube bundle, where they will impact upon the tube bundle and can cause rupture or large amounts of wear to the heat transfer tubes. To prevent this adverse condition, a circumferential row of cylindrical members are positioned peripherally about the entry portion of the tube bundle. These members will have an outside diameter, pitch, and geometric array corresponding to that of the heat transfer tubes, so as to minimize pressure drop, due to flow across them.
The heat exchanger tube bundle fluid entry area is a region where particular problems can occur because pieces of metallic debris can collect and focus their mass at this low elevation. The metallic debris collected at the bottom of the annular down-comer passage can be swept into the tube bundle, where they will impact upon the tube bundle and can cause rupture or large amounts of wear to the heat transfer tubes. To prevent this adverse condition, a circumferential row of cylindrical members are positioned peripherally about the entry portion of the tube bundle. These members will have an outside diameter, pitch, and geometric array corresponding to that of the heat transfer tubes, so as to minimize pressure drop, due to flow across them.
Description
~6~6~
W.E. Case No. 52,021 HEAT EXCHAN~ER TUBE BUNDLE PROTECTION APPARATUS
BACKGROUND OF THE INVENTION
Field of the Invention:
The present invention relates in general to improvements in the construction of heat exchangers of the tube bundle type. The improvement is for protecting the heat transfer tubes from damage by contact with solid debris inadvertently contained within the working fluid which flows through the tube bundle to effect heat -transfer therebetween.
Descr_ption of t e Prior Art.
Heat exchangers of the tube bundle type have been employed in a wide variety of applicatio~s to effect heat transfer to or from the working fluid.
One such application is the use of a heat exchanger commonly referred to as a steam generator for conver-ting the working fluid, i.e., water, into steam for the generation of electrical power. Such steam generators are usually constructed as a bundle of tubes extending from a supporting tubesheet and contained within a cylindrical wrapper. The cylindri-cal wrappr defines an annular downcomer passage between itself and the concentric outer shell. A
mixture of fresh feedwater plus return water from a liquid/vapor separator enters at the tube bundle base through an opening in the wrapper at the bottom of `
W.E. Case No. 52,021 HEAT EXCHAN~ER TUBE BUNDLE PROTECTION APPARATUS
BACKGROUND OF THE INVENTION
Field of the Invention:
The present invention relates in general to improvements in the construction of heat exchangers of the tube bundle type. The improvement is for protecting the heat transfer tubes from damage by contact with solid debris inadvertently contained within the working fluid which flows through the tube bundle to effect heat -transfer therebetween.
Descr_ption of t e Prior Art.
Heat exchangers of the tube bundle type have been employed in a wide variety of applicatio~s to effect heat transfer to or from the working fluid.
One such application is the use of a heat exchanger commonly referred to as a steam generator for conver-ting the working fluid, i.e., water, into steam for the generation of electrical power. Such steam generators are usually constructed as a bundle of tubes extending from a supporting tubesheet and contained within a cylindrical wrapper. The cylindri-cal wrappr defines an annular downcomer passage between itself and the concentric outer shell. A
mixture of fresh feedwater plus return water from a liquid/vapor separator enters at the tube bundle base through an opening in the wrapper at the bottom of `
2 W.E. 52,021 the downcomer passage at the tubesheet. This opening, being arranged at the lowest elevation, is a natural collection poi~t for solid debris left behind during steam generator manufacture or created by later repairs, internal breakage and/or wear during normal operation. Water, at this opening for entry into the tube bundle, is in a highly turbulent state because of sharp changes in the downcomer passage flow geometry and the 90 chang~ in direction it must follow. Any debris at the bottom of the downcomer passage will be picked up by the vigorous water flow and thrown against the exposed thin-walled heat trans-fer tubes within the tube bundle. The impact of the solid debris with the heat transfer tubes can often cause tube rupture. Because of this turbulence and ~he ~low changes caused by electrical load varla-t~ons, ~he solld debrls will not rema~n at the same location within the tube bundle. Such debris usually moves about the lower portion of the tube bundle, rubbing and wearing against the tubes, and is often thrown against those heat -transfer tubes. Typical debris found in steam generators at this location can vary in size from one-half inch hexagonal nuts to pieces of steel broken loose from weldments serving as wrapper to shell supports.
Accordingly, it can be appreciated that there is an unsolved need to provide a protection apparatus for preventing impact and wear damage to the thin-walled heat transfer tubes within a tube bundle of a heat exchanger which is subject to repeated contact with solid debris contained within the working fluid.
SUMMARY OF THE INVENTION
It is broadly an object of the present invention to provide an apparatus for protecting the
Accordingly, it can be appreciated that there is an unsolved need to provide a protection apparatus for preventing impact and wear damage to the thin-walled heat transfer tubes within a tube bundle of a heat exchanger which is subject to repeated contact with solid debris contained within the working fluid.
SUMMARY OF THE INVENTION
It is broadly an object of the present invention to provide an apparatus for protecting the
3 W.E. 52,0Zl heat transfer tubes of a heat exchanger tube bundle.
The invention fulfills the specific requirements of protecting the heat transfer tubes from wear or rupture caused by repeated contact with solid debris 5 within the working fluid. Specifically, it is within the contemplation of ore aspect of the present inven-tion to provide a heat exchanger tube bundle protec-tion apparatus which prevents pieces of metallic debris from being swept into the tube bundle where they will impact upon and potentially cause wearing or rupturing of the heat transfer tubes. The impacting can occur during all operating conditions of the heat exchanger and its associated support equipment.
Another ob~ect of the present invention is to provide a heat exchanger tube bundle protection apparatus which causes a rninimal pressure drop of the working fluid flowing therethrough.
Another object of the present invention is to provide a heat exchanger tube bundle protection apparatus which is of simple design and construction.
Another object of the present invention is to provide a heat exchanger tube bundle protection apparatus which provides additional operational reli-ablity and maintains tube bundle accessibility.
In accordance with one embodiment of thepresent invention, there is provided an improved heat exchanger of the type in which a bundle of heat transfer tubes is contained within a ho~sing, and in which an opening is provided within the housing to permit entry for the flow of a fluid over the tubes.
The improvement of the present invention comprises providing protecting means arranged at the entry periphery of a portion of the bundle adjacent the opening for protecting the tubes from contact with
The invention fulfills the specific requirements of protecting the heat transfer tubes from wear or rupture caused by repeated contact with solid debris 5 within the working fluid. Specifically, it is within the contemplation of ore aspect of the present inven-tion to provide a heat exchanger tube bundle protec-tion apparatus which prevents pieces of metallic debris from being swept into the tube bundle where they will impact upon and potentially cause wearing or rupturing of the heat transfer tubes. The impacting can occur during all operating conditions of the heat exchanger and its associated support equipment.
Another ob~ect of the present invention is to provide a heat exchanger tube bundle protection apparatus which causes a rninimal pressure drop of the working fluid flowing therethrough.
Another object of the present invention is to provide a heat exchanger tube bundle protection apparatus which is of simple design and construction.
Another object of the present invention is to provide a heat exchanger tube bundle protection apparatus which provides additional operational reli-ablity and maintains tube bundle accessibility.
In accordance with one embodiment of thepresent invention, there is provided an improved heat exchanger of the type in which a bundle of heat transfer tubes is contained within a ho~sing, and in which an opening is provided within the housing to permit entry for the flow of a fluid over the tubes.
The improvement of the present invention comprises providing protecting means arranged at the entry periphery of a portion of the bundle adjacent the opening for protecting the tubes from contact with
4 W.E. 52,021 solid debris within the fluid, while allowing the unhindered flow of fluid therethrough.
Further in accordance with-the above embodi-ment of the present invention, the protecting means are constructed of either solid rods or hollow tubes whose walls are much thicker than those of the heat transfer tubes.
Still further in accordance with the above embodiment of the present invention, the protecting means are constructed of a plurality of cylindrical members having an outside diameter, pitch, and geometric array corresponding to the outside diameter and pitch of the heat transfer tubes.
B~IEF DFSCRIPTION OF THE DRAWINGS
The above description, as well as f~lrther objects, features and advantages of the present ~nven-tion will be more fully understood by reference to the followin~ detailed descrlption of the presently preferred, but nonetheless illustra-tive, hea-t exchanger tube bundle protection apparatus. These are drawn in accordance with the present invention, when taken in conjunction with the accompanying drawings, wherein:
FIG. 1 is a perspective view of a heat exchanger having a portion thereof cut away, and showing the protection apparatus arranged about the periphery of a lower portion of the heat transfer tubes of the contained tube bundle;
FIG. 2 is a cross-sectional view of a por-tion of the heat exchanger as shown in FIG. 1, showing the protection apparatus being secured to a tubesheet at the mouth of the annular downcomer passage;
FIG. 3 is a top plan view of one-quarter of a typical tube bundle showing the arrangement of the
Further in accordance with-the above embodi-ment of the present invention, the protecting means are constructed of either solid rods or hollow tubes whose walls are much thicker than those of the heat transfer tubes.
Still further in accordance with the above embodiment of the present invention, the protecting means are constructed of a plurality of cylindrical members having an outside diameter, pitch, and geometric array corresponding to the outside diameter and pitch of the heat transfer tubes.
B~IEF DFSCRIPTION OF THE DRAWINGS
The above description, as well as f~lrther objects, features and advantages of the present ~nven-tion will be more fully understood by reference to the followin~ detailed descrlption of the presently preferred, but nonetheless illustra-tive, hea-t exchanger tube bundle protection apparatus. These are drawn in accordance with the present invention, when taken in conjunction with the accompanying drawings, wherein:
FIG. 1 is a perspective view of a heat exchanger having a portion thereof cut away, and showing the protection apparatus arranged about the periphery of a lower portion of the heat transfer tubes of the contained tube bundle;
FIG. 2 is a cross-sectional view of a por-tion of the heat exchanger as shown in FIG. 1, showing the protection apparatus being secured to a tubesheet at the mouth of the annular downcomer passage;
FIG. 3 is a top plan view of one-quarter of a typical tube bundle showing the arrangement of the
-5- W.E. 52,021 protection apparatus c~bout the periphery of the tube bundle;
FIG~ 4 is a cross-sectional view of a heat exchanger tube bundle showing the arrangement of the protection apparatus in accordance with another e~bodiment of the present invention; and FIG, 5 is the cross-sectional view of a portion of the heat exchanger as shown in FIG. 1, showing the protection apparatus in accordance with another embodiment of the present invention.
DESCRIPTION OF THE PREFE~RED EMBODIMENr Referring now to the drawings, wherein like reference numerals represent like elements, there is sho~n in FIG. 1 a portion of a heat exchanger, for example, a steam generator, and generally designated ky reference numeral 100. The heat exchanger 100 is constructed of an outer cylindrical shell 102 and an inner concentric cylindrical wrapper 104, which define therebetween an annular dcwncomer passage 106, as more clearly shown inFIG. 2, Contained by the cylindrical wrapper 104 is a tube bundle 108, constructed generally of a plurality of heat transfer tubes 110, and maintained in fixed spaced relationship by a plurality of parallel sEkaced-cap~rt flow di8trLbution support baEfles ]12. The flow distribution support baffles 112 are provided with a plurality of openings 114 through which the heat transfer tubes 110 pass. The lower ends of the heat transfer tubes 110 extend through a tubesheet 116 and communicate with a cavity 118 defined by an end cap 120 having a plural-ity of entry holes 122 through which the heat transfer fluid which flows through the heat transfer tubes internal passage is supplied. End cap flow ccmes through nozzles 123 which penetrate the end cap wall. The lc~3r end of the wrapper 104 terminates above the tubesheet 116 to provide an opening 125 communicating between the annul æ downcomer passage 106 and the lower portion of the tube bundle 108 confined by the wrapper.
A
FIG~ 4 is a cross-sectional view of a heat exchanger tube bundle showing the arrangement of the protection apparatus in accordance with another e~bodiment of the present invention; and FIG, 5 is the cross-sectional view of a portion of the heat exchanger as shown in FIG. 1, showing the protection apparatus in accordance with another embodiment of the present invention.
DESCRIPTION OF THE PREFE~RED EMBODIMENr Referring now to the drawings, wherein like reference numerals represent like elements, there is sho~n in FIG. 1 a portion of a heat exchanger, for example, a steam generator, and generally designated ky reference numeral 100. The heat exchanger 100 is constructed of an outer cylindrical shell 102 and an inner concentric cylindrical wrapper 104, which define therebetween an annular dcwncomer passage 106, as more clearly shown inFIG. 2, Contained by the cylindrical wrapper 104 is a tube bundle 108, constructed generally of a plurality of heat transfer tubes 110, and maintained in fixed spaced relationship by a plurality of parallel sEkaced-cap~rt flow di8trLbution support baEfles ]12. The flow distribution support baffles 112 are provided with a plurality of openings 114 through which the heat transfer tubes 110 pass. The lower ends of the heat transfer tubes 110 extend through a tubesheet 116 and communicate with a cavity 118 defined by an end cap 120 having a plural-ity of entry holes 122 through which the heat transfer fluid which flows through the heat transfer tubes internal passage is supplied. End cap flow ccmes through nozzles 123 which penetrate the end cap wall. The lc~3r end of the wrapper 104 terminates above the tubesheet 116 to provide an opening 125 communicating between the annul æ downcomer passage 106 and the lower portion of the tube bundle 108 confined by the wrapper.
A
6~
6 W~E. 52,021 Referring now to FIGS. 1-3, the protection apparatus of the present invention will be described.
As previously noted, pieces of metallic debris can collect at the bottom of the annular downcomer passage 106 overlying the tubesheet 116 from where they can be swept into the tube bundle 108 by means of the flowing fluid, as indicated by the arrows.
Because of the relatively high velocity and turbu-lence created within the opening 125, the debris, in the absence of the protection apparatus of the present invention, would impact and wear away or rupture the heat transfer tubes 110. In this regard, the protection apparatus of the present invention employs a plurality of strong cylindrical members 124 constructed as either solid rods or thick-walled, hollow tubesl, for example, having a wall thickness of greater than about 0.10 inches.
The cylindrical members 124 generally have a length sufficient to span the opening 125 and are arranged around the lower peripheral portion of the tube bundle 108 in alignment with the longitudinal axis thereof. The cylindrical members 124 are dimen-sioned to have an outside diameter corresponding to the outside diameter of the heat transfer tubes 110 and are arranged in an array having a pitch corres-ponding to the pitch of the heat transfer tubes. ln this regard, the cylindrical members 124, by having the same outside diameter and pitch as that of the heat transfer tubes 110, act like another row of heat transfer tubes 110 to the flowing fluid such that the pressure loss of the fluid flowing through the annular downcomer passage 106 and across the cylin-drical members into the tube bundle 108 is almost negligible, typically less than 0.04 pounds per square inch. Accordingly, the cylindrical members 3K (see e ~e~ e n~ 7 f /6. ~) ~6~a6~
6 W~E. 52,021 Referring now to FIGS. 1-3, the protection apparatus of the present invention will be described.
As previously noted, pieces of metallic debris can collect at the bottom of the annular downcomer passage 106 overlying the tubesheet 116 from where they can be swept into the tube bundle 108 by means of the flowing fluid, as indicated by the arrows.
Because of the relatively high velocity and turbu-lence created within the opening 125, the debris, in the absence of the protection apparatus of the present invention, would impact and wear away or rupture the heat transfer tubes 110. In this regard, the protection apparatus of the present invention employs a plurality of strong cylindrical members 124 constructed as either solid rods or thick-walled, hollow tubesl, for example, having a wall thickness of greater than about 0.10 inches.
The cylindrical members 124 generally have a length sufficient to span the opening 125 and are arranged around the lower peripheral portion of the tube bundle 108 in alignment with the longitudinal axis thereof. The cylindrical members 124 are dimen-sioned to have an outside diameter corresponding to the outside diameter of the heat transfer tubes 110 and are arranged in an array having a pitch corres-ponding to the pitch of the heat transfer tubes. ln this regard, the cylindrical members 124, by having the same outside diameter and pitch as that of the heat transfer tubes 110, act like another row of heat transfer tubes 110 to the flowing fluid such that the pressure loss of the fluid flowing through the annular downcomer passage 106 and across the cylin-drical members into the tube bundle 108 is almost negligible, typically less than 0.04 pounds per square inch. Accordingly, the cylindrical members 3K (see e ~e~ e n~ 7 f /6. ~) ~6~a6~
7 W.E. 52,021 function as an almost indestructable screen against impacting pieces of metallic debris swept along by the fluid flowing within the annular downcomer passage 106. In one embodiment of the present inven-tion, the cylindrical members 124 represent in numberapproximately 5% of the heat transfer tubes 110.
The cylindrical members 124 can be secured at their lower ends to the tubesheet 116 within openings 126 provided about the periphery of the tube bundle 108. The openings 126 may be threaded so as to receive a corresponding threaded portion of the lower ends of the cylindrical members 124, or may provide for a slip or friction fit therebetween. In any event, the cyllndrical member~ 124 can be spot-welded or permanently fastened in some other way to the tubesheet 116 lf deslred. The upper ends o:~ the cylin-drical members 124, may extend through aligned openings 128 provided within the first flow distribu-tion support baffle 112. The upper end of the cylindrical members 124 can be secured to the support baffle 112 by means of a collar 130 engaging a portion of. the cylindrical members, as well as by welding them together. As shown in FIG. 2, the cylindrical members 124 extend between the tube-sheet 116 and the support baffle il2. However, it is not required that the cylindrical members 124 extend to the first support baffle 112. In this regard, it is only required that the cylindrical members 124 extend generally across the extent of the opening 125, whereby the upper end of the cylindrical members may terminate freely under the first support baffle at a location indicated, for example, by the A dotted lines 132l. Protection above the support baffle 112 is not required, as this flow distribution support baffle prevents any debris from passing there~
beyond.
~2 5ee f~6. 5' ~2~6~3~
The cylindrical members 124 can be secured at their lower ends to the tubesheet 116 within openings 126 provided about the periphery of the tube bundle 108. The openings 126 may be threaded so as to receive a corresponding threaded portion of the lower ends of the cylindrical members 124, or may provide for a slip or friction fit therebetween. In any event, the cyllndrical member~ 124 can be spot-welded or permanently fastened in some other way to the tubesheet 116 lf deslred. The upper ends o:~ the cylin-drical members 124, may extend through aligned openings 128 provided within the first flow distribu-tion support baffle 112. The upper end of the cylindrical members 124 can be secured to the support baffle 112 by means of a collar 130 engaging a portion of. the cylindrical members, as well as by welding them together. As shown in FIG. 2, the cylindrical members 124 extend between the tube-sheet 116 and the support baffle il2. However, it is not required that the cylindrical members 124 extend to the first support baffle 112. In this regard, it is only required that the cylindrical members 124 extend generally across the extent of the opening 125, whereby the upper end of the cylindrical members may terminate freely under the first support baffle at a location indicated, for example, by the A dotted lines 132l. Protection above the support baffle 112 is not required, as this flow distribution support baffle prevents any debris from passing there~
beyond.
~2 5ee f~6. 5' ~2~6~3~
8 W.E. 52,021 There has thus far been described an improved heat exchanger 100 of the type in which a tube bundle 108, constructed of heat transfer tubes 110, ls contained within a cylindrical wrapper 104, and in which an opening 125 is provided within the wrapper for the flow of a fluid over the tubes. The improvement comprises a plurality of cylindrical members 124 arranged about the peripheral portion of the bundle in alignment with the lonsitu-dinal axis of the bundle and adjacent the opening for protecting the tubes from contacting solid debris within the fluid, while allowing the ~low of the fluid therethrough. The cylindrical protection members have an outside diameter corresponding to the outside diameter of the tubes and are arrang~d in an identical array with an identical pitch corresponding to the pitch of the tubes.
Although the invention herein has been descrlbed with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and application of the present invention. For example, as shown in FIG. 4, a heat exchanger 134 is constructed of an outer housing 136 provided with an opening 138. A
plurality of longitudinally extending heat transfer tubes 140 are arranged in an array within the heat exchanger 134. In accordance with the invention, cylindrical members 124' are arranged in the array of heat tranfer tubes 140 at a peripheral portion adjacent the opening 138. The cylindrical mem-bers 124' are dimensioned to have an outside diameter corresponding to the outside diameter of the heat transfer tubes 140 and are arranged in an array having a pitch corresponding to the pitch of the array of heat transfer tubes. In addition, a pair of -L6~
g W.E. 52,021 extensions 142 are arranged extending inwardly from the outer housing 136, so as to provide a barrier before the first cylindrical members 124' for solid foreign debrisO Thus, the cylindrical members 124' prevent solid debris contained within the working fluid from contacting the heat transfer tubes 140, as previously described with refere~ce to the embodiment illustrated in FIGS. 1~3.
It is, therefore, to be understood that numerous modifications may be made in the illustra-tive embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the apper~ded claims.
Although the invention herein has been descrlbed with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and application of the present invention. For example, as shown in FIG. 4, a heat exchanger 134 is constructed of an outer housing 136 provided with an opening 138. A
plurality of longitudinally extending heat transfer tubes 140 are arranged in an array within the heat exchanger 134. In accordance with the invention, cylindrical members 124' are arranged in the array of heat tranfer tubes 140 at a peripheral portion adjacent the opening 138. The cylindrical mem-bers 124' are dimensioned to have an outside diameter corresponding to the outside diameter of the heat transfer tubes 140 and are arranged in an array having a pitch corresponding to the pitch of the array of heat transfer tubes. In addition, a pair of -L6~
g W.E. 52,021 extensions 142 are arranged extending inwardly from the outer housing 136, so as to provide a barrier before the first cylindrical members 124' for solid foreign debrisO Thus, the cylindrical members 124' prevent solid debris contained within the working fluid from contacting the heat transfer tubes 140, as previously described with refere~ce to the embodiment illustrated in FIGS. 1~3.
It is, therefore, to be understood that numerous modifications may be made in the illustra-tive embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the apper~ded claims.
Claims (16)
1. An improved heat exchanger of the type in which a bundle of heat transfer tubes arranged in an array having a minimum pitch is contained within a housing, and in which an opening is provided within said housing for the flow of a fluid over said tubes, wherein the improvement comprises protecting means arranged at the periphery of a portion of said bundle adjacent said opening for protecting said tubes from contact with solid debris within said fluid, while allow-ing the flow of said fluid therethrough, said protecting means arranged spaced from said tubes in an array having a pitch corresponding to said minimum pitch of said tubes.
2. The heat exchanger of Claim 1, wherein said protecting means comprises a plurality of solid rods.
3. The heat exchanger of Claim 1, wherein said protecting means comprises a plurality of members having an outside size and shape corresponding to the outside size and shape of said heat transfer tubes.
4. The heat exchange of Claim 1, wherein said protecting means comprises a plurality of cylindrical members having their longitudinal axes in alignment with the longitud-inal axis of said bundle of said heat transfer tubes.
5. The heat exchanger of Claim 1, wherein said protecting means extends along only a portion of the length of said heat transfer tubes and is coextensive with said opening.
6. The heat exchanger of Claim 1, wherein said protecting means is secured at one end thereof to said heat exchanger.
7. The heat exchanger of Claim 1, wherein said protecting means is secured at both ends thereof to said heat exchanger.
8. An improved heat exchanger of the type in which a bundle of heat transfer tubes arranged in an array having a minimum pitch is contained within a housing, and in which an opening is provided within said housing for the flow of a fluid over said tubes, wherein the improve-ment comprises a plurality of cylindrical members arranged at the periphery of a portion of said bundle in alignment with the longitudinal axis of said bundle and adjacent said open-ing for protecting said tubes from contact with solid debris within said fluid, while allowing the flow of said fluid therethrough, said cylindrical members having an outside diameter corresponding to the outside diameter of said tubes and arranged spaced from said tubes in an array having a pitch corresponding to said minimum pitch of said tubes.
9. The heat exchanger of Claim 8, wherein said cylindrical members comprise a plurality of solid rods.
10. The heat exchanger of Claim 8, wherein said cylindrical members are arranged circumscribing said periphery of said bundle.
11. The heat exchanger of Claim 6, wherein another end of said protecting means is unsecured.
12. The heat exchanger of Claim 11, wherein the unsecured end of said protecting means is arranged beyond the extent of said opening.
13. The heat exchanger of Claim 8, wherein said cylindrical members are secured at one end thereof to said heat exchanger and unsecured at another end thereof.
14. The heat exchanger of Claim 13, wherein the unsecured end of said cylindrical members is arranged beyond the extent of said opening.
15. The heat exchanger of Claim 1, further includ-ing a pair of extension members attached to said housing and extending inwardly on opposite sides of said opening and having a portion arranged adjacent said protecting means for preventing the passage of said solid debris therebetween.
16. The heat exchanger of Claim 8, further including a pair of extension members attached to said housing and extending inwardly on opposite sides of said opening and having a portion arranged adjacent said cylindrical members for preventing the passage of said solid debris therebetween.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US67182184A | 1984-11-15 | 1984-11-15 | |
| US671,821 | 1984-11-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1261692A true CA1261692A (en) | 1989-09-26 |
Family
ID=24696007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000493437A Expired CA1261692A (en) | 1984-11-15 | 1985-10-21 | Heat exchanger tube bundle protection apparatus |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS61128003A (en) |
| CA (1) | CA1261692A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6007241B2 (en) * | 2011-08-04 | 2016-10-12 | ウエスチングハウス・エレクトリック・カンパニー・エルエルシー | Tube and shell steam generator |
-
1985
- 1985-10-21 CA CA000493437A patent/CA1261692A/en not_active Expired
- 1985-11-15 JP JP25650685A patent/JPS61128003A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0531041B2 (en) | 1993-05-11 |
| JPS61128003A (en) | 1986-06-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |