Description:FIELD OF INVENTION
[001] The present invention relates to an apparatus for fabrication of welded walls / panels made of tubes of various sizes and specifications for high temperature and high-pressure applications.

BACKGROUND OF THE INVENTION

[002] In power plants, the spiral and vertical panels / walls form the walls surrounding the furnace, where the fuel is burnt and the heat is transferred to the medium flowing inside the tubes. The furnace walls consist of setting of required number of panels as per drawing. The Length of the panels varies from 2 to 20 meters and the number of tubes per panel / wall varies from 22 tubes to 400 tubes with outside Diameter ranging from 38.1 mm to 76.1 mm. These spiral panels are arranged vertically to make furnace wall. At top of each spiral wall one transition panel is positioned which changes the medium flow from spiral tubes to vertical tubes using forged three elbow and single elbow. Stubs are welded with elbow in vertical direction. In an example one transition panel consist plurality of forged single elbows and a specified three elbow welded with stub tubes of required length.

[003] Boring of the stub tubes in vertical upward direction is difficult in trial assembly of water wall panels and also at site where header tubes are joined with all stubs. Normally Boring of normal panel tubes are done on stands in horizontal position with boring machine hanged with EOT Crane. But for this job particularly ID correction is done by pneumatic or electric small grinder in vertically down direction. This method consumes more time and also finishing is irregular resulting in repair of TIG joints. Hence this process is not only consumes time but also accuracy is compromised in making ID correction which is not desirable.

[004] No prior art found for apparatus/fixture for boring of transition panel stub tubes in water wall panels and ID correction arrangement in panels or in supercritical boilers. However, few prior arts for the process and method of welding power plant components are listed below.

[005] DE102011009947A1 titled “Process for the heat treatment of welds on power plant components” discuss about a method for preferably assembly-side heat treatment of weld seams on membrane tube walls and / or tube wall registers of a steam generator, the method being characterized in that local heating of individual weld seams or groups of weld seams is conductive, i. H. by applying an electrical voltage.

[006] US7726264B2 titled “Method of installing furnace walls of a boiler” describes about method of installing furnace walls for a boiler that does not require dedicated temporary lifting mechanism and reduces the installation work period significantly. The method of installing furnace walls for a boiler configured with an upper portion of boiler proper and a lower portion of boiler proper, temporally suspending two left and right face furnace water wall panels among four furnace water wall panels, the upper portion of boiler proper is assembled while it is hanged from a top girder module positioned on the top portion of a center portion in a boiler frame, a furnace rear wall and a furnace front wall among the furnace water wall panels are hanged sequentially, the temporally suspended two left and right face furnace water wall panels are moved to designated positions, and the upper ends of the furnace water wall panels are connected with the lower end of the upper portion of boiler proper.

[007] None of the above cited prior art discusses the issues related to ID boring on transition panel stub tubes and accuracy in the job simultaneously.

[008] The present invention is directed to a simple method for performing the ID boring on transition panel stub tubes and simultaneously doing the job swiftly and accurately.

OBJECTS OF THE INVENTION

[009] It is therefore a principal object of the present invention is to develop a method and an apparatus for doing the ID boring on transition panel stub tubes

[0010] Another object of the present invention is to reduce the time for ID boring on transition panel stub tubes and enhancing the accuracy of the job

[0011] These and other objects and advantages of the present subject matter will be apparent to a person skilled in the art after consideration of the following detailed description taken into consideration with accompanying drawings in which preferred embodiments of the present subject matter are illustrated.

SUMMARY OF THE INVENTION

[0012] This summary is provided to introduce concepts related to an apparatus and a method for carrying out boring on vertical stubs in transition panel.

[0013] The present invention relates to an apparatus for carrying out inside diameter (ID) boring on transition panel stubs tubes. The apparatus comprises a connecting means for fixing a portable hand drilling gun machine. A rod having a distal end configured to mate an opening defined in the portable hand drilling gun machine and the other end of the rod having substantially “U” shape arrangement which is drilled at two places one at a top and other at bottom to hold a boring tool which is tightened with two nuts. Fixing the boring tool to penetrate inside the transition panel stubs tubes and insert the boring tool as per required boring depth, regulate the RPM (revolutions per minute) of the portable hand drilling gun machine to complete the inside diameter (ID) boring process.

[0014] In one embodiment a method for carrying out inside diameter boring on transition panel stubs tubes is disclosed. The method comprising the steps of: configuring a connecting means for fixing a portable hand drilling gun machine. Configuring a rod having a distal end to mate an opening defined in the portable hand drilling gun machine and the other end of the rod having substantially “U” shape arrangement which is drilled at two places one at a top and other at bottom to hold a boring tool which is tightened with two nuts. Positioning the boring tool for penetrating inside the transition panel stubs tubes. Inserting the boring tool as per required boring depth, regulating the RPM (revolutions per minute) of the portable hand drilling gun machine for completing the inside diameter (ID) boring process.

[0015] In an aspect the apparatus is used for boring at any position on the transition panel stub tubes.

[0016] In an aspect the apparatus is used for boring of vertical stubs in transition panel that is suitable for high temperature and high pressure applications.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS

[0017] It is to be noted, however, that the appended drawings illustrate only typical embodiments of the present subject matter and are therefore not to be considered for limiting of its scope, for the invention may admit to other equally effective embodiments. The detailed description is described with reference to the accompanying figures. In the figures, a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the figures to reference like features and components. Some embodiments of system or methods or structure in accordance with embodiments of the present subject matter are now described, by way of example, and with reference to the accompanying figures, in which:

[0018] FIG. 1 is a perspective view of an apparatus used for doing ID boring on transition panel stub tubes in an embodiment of the present invention;

[0019] FIG. 2 is a top perspective view of the transition panel stub tubes in an embodiment of the present invention; and

[0020] FIG. 3 is a method for doing ID boring on transition panel stub tubes in an embodiment of the present invention.

[0021] The figures depict embodiments of the present subject matter for the purposes of illustration only. A person skilled in the art will easily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.

DETAIL DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE PRESENT INVENTION WITH REFERENCE TO THE ACCOMPANYING DRAWINGS

[0022] While the embodiments of the disclosure are subject to various modifications and alternative forms, specific embodiment thereof have been shown by way of example in the figures and will be described below. It should be understood, however, that it is not intended to limit the disclosure to the particular forms disclosed, but on the contrary, the disclosure is to cover all modifications, equivalents, and alternative falling within the scope of the disclosure.

[0023] The terms “comprises”, “comprising”, or any other variations thereof used in the disclosure, are intended to cover a non-exclusive inclusion, such that a device, system, assembly that comprises a list of components does not include only those components but may include other components not expressly listed or inherent to such system, or assembly, or device. In other words, one or more elements in a system or device proceeded by “comprises… a” does not, without more constraints, preclude the existence of other elements or additional elements in the system or device.

[0024] The present invention relates to an apparatus (10) and a method (20) for ID correction and boring on transition panel stub tubes (7) for high pressure and high temperature applications.

[0025] FIG. 1 is a perspective view of an apparatus (10) used for doing ID boring on transition panel stub tubes (7) in an embodiment of the present invention. The apparatus (10) having a connecting means (8) for fixing to a portable hand drilling gun machine (1).

[0026] In one embodiment the invention the apparatus (10) is designed to perform machining, in particular boring on spiral and vertical panels or walls. In a preferred embodiment required number of panels is defined by a drawing. For example one transition panel consists of 140 forged single elbows and 420 three elbow welded with stub tubes (7) of 150mm length.

[0027] In a preferred embodiment the apparatus (10) further consists of a rod (2) which is threaded at one end such that the rod (2) is fixed through the outlet of the portable hand drilling gun machine (1) and positioned properly. The other end of the rod (2) having substantially “U” shape arrangement (5) which is drilled at two places one on top and other at the bottom. The “U” shape arrangement (5) act as a boring tool holder. The boring tool (3) is tightened with two nuts (4) in the “U” shape arrangement (5). After fixing the boring tool (3), the apparatus (10) is fixed on the job panel (6) in vertically downward position in such a manner that the boring tool (3) passes inside the transition panel stub tubes (7). After inserting the boring tool (3) as per depth, RPM (revolutions per minute) of machine (1) is regulated and switched on to complete the ID boring. In a preferred embodiment the boring depth as per drawing is 5 to 6mm. After completing the process in one stub tubes (7), the portable hand drilling gun machine (1) is moved to each one of the transitional panel stub tubes (7) to repeat the process to complete 420 stub tubes (7) ID boring.

[0028] FIG. 2 is a top perspective view of the transition panel stub tubes (7) in an embodiment of the present invention. In a preferred embodiment different job panel (6) uses the apparatus (10) for boring and ID correction for the plurality of stub tubes (7) or any transition piece. The elbow stub tubes having same inner diameter or different diameter and are connected via an inlet and outlet of the portable hand drilling gun machine (1). Using the apparatus (10) the time is reduced for ID boring on the transition panel stub tubes (7) and the accuracy of the job is enhanced. In a preferred embodiment, the elbow stub tubes and single elbow stub tubes is of the same material which is implanted and welded to the furnace wall of the super crucial boilers or high temperature and high pressure applications.

[0029] In a preferred embodiment if the bores are produced using the apparatus (10) and the job panel (6) is able to encompass the transition panel stub tubes (7) volume. To position the boring tool (3), it is necessary to determine the position of the transition panel stub tubes (7) in the job panel (6) and then RPM (revolutions per minute) of the machine (1) is set and regulated. During these operations, the measurement and movement uncertainties combine which is avoided by using the apparatus (10). In addition, the actual shape of the panel correspond exactly to its theoretical shape as described in the drawing by using the apparatus (10).

[0030] In a preferred embodiment the apparatus (10) is configured to perform inside diameter (ID) boring of the vertical stubs (7) in the transition panel which is suitable for high temperature and high pressure applications. The transition panel stubs tubes (7) is made up of corrosion resistant material such as stainless steel or other suitable material. The rod (2) is threaded at one end which makes a receiving portion for the portable hand drilling gun machine (1). The portable hand drilling gun machine (1) is used for inside diameter (ID) boring at any position on the transition panel stub tubes (7). For a given outside diameter of the transition panel stub tubes (7), the portable hand drilling gun machine (1) is sized to fit any diameter. The apparatus (10) is configured to perform inside diameter (ID) boring for a three elbows stub tubes and a single elbow stub tubes. In a preferred embodiment the apparatus (10) is used for ID correction arrangement in the transition panels and in supercritical boilers. The apparatus (10) provides operator safety and convenience and improved equipment performance during standard ID boring procedure.

[0031] FIG. 3 is a method for doing ID boring on transition panel stub tubes (7) in an embodiment of the present invention. In one embodiment the method (20) of performing a boring operation on a vertical stubs in transition panel is described. The method (20) is for carrying out inside diameter (ID) boring on transition panel stubs tubes (7). The method (20) comprising the steps of: Step 22: Configuring a connecting means (8) for fixing a portable hand drilling gun machine (1). Step 24: Configuring a rod (2) having a distal end to mate an opening defined in the portable hand drilling gun machine (1) and the other end of the rod (2) having substantially “U” shape arrangement (5) which is drilled at two places one at a top and other at bottom to hold a boring tool (3) which is tightened with two nuts (4). Step 26: Positioning the boring tool (3) for penetrating inside the transition panel stubs tubes (7). Step 28: Inserting the boring tool (3) as per required boring depth, regulating the RPM (revolutions per minute) of the portable hand drilling gun machine (1) for completing the inside diameter (ID) boring process.

[0032] In a preferred embodiment the apparatus (10) performing the ID boring process on the transition panel tubes (7) is disclosed. A connecting means (8) is used for fixing a portable hand drilling gun machine (1). In a preferred embodiment a hand drill tool that is operatively connected via connecting means (8) to the portable hand drilling gun machine (1). The hand drill tool is adapted to be removably connected to the portable hand drilling gun machine (1). The rod (2) having a distal end configured to mate an opening defined in the portable hand drilling gun machine (1) and the other end of the rod (2) having substantially “U” shape arrangement (5) which is drilled at two places one at a top and other at bottom to hold a boring tool (3) which is tightened with two nuts (4). Position the apparatus (10) in a vertically downward position on a job panel (6) such that the boring tool (3) penetrate inside the transition panel stubs tubes (7). Insert the boring tool (3) as per required boring depth, regulate the RPM (revolutions per minute) of the portable hand drilling gun machine (1) to complete the inside diameter (ID) boring process.

[0033] In one embodiment, the apparatus (10) shown in FIG. 1 provides the advantages of reduced operator fatigue and an efficient method to carry out the work with better finish and in a reduced cycle time. Because the apparatus (10) acting in the vertical direction, the operator is not required to exert manual force on the apparatus (10) during positioning or during performance of the ID boring operation. Also, using the apparatus (10) ID boring on transition panel stub tubes is completed in a precision manner. The apparatus (10) is used for fabrication of welded walls / panels made of tubes of various sizes and specifications for high temperature and high-pressure applications.

[0034] It should be noted that the description and figures merely illustrate the principles of the present subject matter. It should be appreciated by those skilled in the art that conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present subject matter. It should also be appreciated by those skilled in the art that by devising various arrangements that, although not explicitly described or shown herein, embody the principles of the present subject matter. Furthermore, all examples recited herein are principally intended expressly to be for pedagogical purposes to aid the reader in understanding the principles of the present subject matter and the concepts contributed by the inventor(s) to furthering the art and are to be construed as being without limitation to such specifically recited examples and conditions. The novel features which are believed to be characteristic of the present subject matter, both as to its organization and method of operation, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures.

[0035] These and other advantages of the present subject matter would be described in greater detail with reference to the following figures. It should be noted that the description merely illustrates the principles of the present subject matter. It will thus be appreciated that those skilled in the art will be able to devise various arrangements that, although not explicitly described herein, embody the principles of the present subject matter and are included within its scope. The present invention will now be described more specifically with reference to the following specification.

[0036] It should be noted that the description and figures merely illustrate the principles of the present subject matter. It should be appreciated by those skilled in the art that conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present subject matter. It should also be appreciated by those skilled in the art that by devising various arrangements that, although not explicitly described or shown herein, embody the principles of the present subject matter and are included within its spirit and scope. Furthermore, all examples recited herein are principally intended expressly to be for pedagogical purposes to aid the reader in understanding the principles of the present subject matter and the concepts contributed by the inventor(s) to furthering the art and are to be construed as being without limitation to such specifically recited examples and conditions. The novel features which are believed to be characteristic of the present subject matter, both as to its organization and method of operation, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures.

[0037] Although embodiments for the present subject matter have been described in language specific to package features, it is to be understood that the present subject matter is not necessarily limited to the specific features described. Rather, the specific features and methods are disclosed as embodiments for the present subject matter. Numerous modifications and adaptations of the system/device of the present invention will be apparent to those skilled in the art, and thus it is intended by the appended claims to cover all such modifications and adaptations which fall within the scope of the present subject matter.

[0038] It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as “open” terms (e.g., the term “including” should be interpreted as “including but not limited to,” the term “having” should be interpreted as “having at least,” the term “includes” should be interpreted as “includes but is not limited to,” etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases “at least one” and “one or more” to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles “a” or “an” limits any particular claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an” (e.g., “a” and/or “an” should typically be interpreted to mean “at least one” or “one or more”); the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of “two recitations,” without other modifiers, typically means at least two recitations, or two or more recitations). Furthermore, in those instances where a convention analogous to “at least one of A, B, and C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances where a convention analogous to “at least one of A, B, or C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B.”

[0039] It will be further appreciated that functions or structures of a plurality of components or steps may be combined into a single component or step, or the functions or structures of one-step or component may be split among plural steps or components. The present invention contemplates all of these combinations. Unless stated otherwise, dimensions and geometries of the various structures depicted herein are not intended to be restrictive of the invention, and other dimensions or geometries are possible. In addition, while a feature of the present invention may have been described in the context of only one of the illustrated embodiments, such feature may be combined with one or more other features of other embodiments, for any given application. It will also be appreciated from the above that the fabrication of the unique structures herein and the operation thereof also constitute methods in accordance with the present invention. The present invention also encompasses intermediate and end products resulting from the practice of the methods herein. The use of “comprising” or “including” also contemplates embodiments that “consist essentially of” or “consist of” the recited feature.

[0040] Although embodiments for the present subject matter have been described in language specific to structural features, it is to be understood that the present subject matter is not necessarily limited to the specific features described. Rather, the specific features and methods are disclosed as embodiments for the present subject matter. Numerous modifications and adaptations of the system/component of the present invention will be apparent to those skilled in the art, and thus it is intended by the appended claims to cover all such modifications and adaptations which fall within the scope of the present subject matter.

Claims:We claim:

1. An apparatus (10) for carrying out inside diameter (ID) boring on transition panel stubs tubes (7) , the apparatus (10) comprising:
a connecting means (8) for fixing a portable hand drilling gun machine (1);
a rod (2) having a distal end configured to mate an opening defined in the portable hand drilling gun machine (1) and the other end of the rod (2) having substantially “U” shape arrangement (5) which is drilled at two places one at a top and other at bottom to hold a boring tool (3) which is tightened with two nuts (4);
position the boring tool (3) to penetrate inside the transition panel stubs tubes (7); and
configure the boring tool (3) as per required boring depth, regulate the RPM (revolutions per minute) of the portable hand drilling gun machine (1) to complete the inside diameter (ID) boring process.
2. The apparatus as claimed in claim 1, configured to perform inside diameter (ID) boring on the transition panel stubs tubes (7) which is suitable for high temperature and high pressure applications.
3. The apparatus as claimed in claim 1, wherein the transition panel stubs tubes (7) is made up of corrosion resistant material such as stainless steel or other suitable material.
4. The apparatus as claimed in claim 1, wherein the portable hand drilling gun machine (1) is used for inside diameter (ID) boring at any position on the transition panel stub tubes (7) and sized to fit any diameter.
5. The apparatus as claimed in claim 1, wherein the apparatus (10) is fixed in a vertically downward position on a job panel (6).
6. The apparatus as claimed in claim 1, configured to perform inside diameter (ID) boring for a three elbows stub tubes and a single elbow stub tubes.
7. The apparatus as claimed in claim 1, configured to perform inside diameter (ID) correction in transition panels and in supercritical boilers.
8. The apparatus as claimed in claim 1, wherein the rod (2) is threaded at one end which makes a receiving portion for the portable hand drilling gun machine (1).
9. A method (20) for carrying out inside diameter (ID) boring on transition panel stubs tubes (7) , the method (20) comprising the steps of:
configuring a connecting means (8) for fixing a portable hand drilling gun machine (1);
configuring a rod (2) having a distal end to mate an opening defined in the portable hand drilling gun machine (1) and the other end of the rod (2) having substantially “U” shape arrangement (5) which is drilled at two places one at a top and other at bottom to hold a boring tool (3) which is tightened with two nuts (4);
positioning the boring tool (3) for penetrating inside the transition panel stubs tubes (7); and
inserting the boring tool (3) as per required boring depth, regulating the RPM (revolutions per minute) of the portable hand drilling gun machine (1) for completing the inside diameter (ID) boring process.
10. A method as claimed in claim 9, wherein the inside diameter (ID) boring process on the transition panel stub tubes is repeated for several stub tubes and single elbow stub tubes.