Claims:WE CLAIM:

1. A three legged triangular fixture (10) for manufacturing of wind-box Upper and Lower panels of a high pressure and high temperature steam generator, the three legged triangular fixture (10) comprising:
a first leg (03);
a second leg (05); and
a third leg or base leg (06), wherein one end of the third leg (06) is welded with one end the first leg (03) and other end of the third leg (06) is welded with one end the second leg (05);
wherein other end of the first leg (03) welded with other end of the second leg (05) to form the three legged triangular fixture (10).

2. The three legged triangular fixture (10) as claimed in claim 1, wherein a fourth leg (04) is welded in between the third leg (05) at one end and other end is welded with the welding joint of the first leg (03) and the second leg (04).

3. The three legged triangular fixture (10) as claimed in claim 1, wherein a triangular base made of 150mm angles is provide to support and to elevate the three legged triangular fixture (10).

4. The three legged triangular fixture (10) as claimed in claim 1, wherein the first leg (03), the second leg (05), the third leg (06) and the fourth leg (04) are 150mm channels that are cut into shape for manufacturing of the three legged triangular fixture (10).

5. The three legged triangular fixture (10) as claimed in claim 1, wherein the first leg (03), the second leg (05), the third leg (06) and the fourth leg (04) are 150mm channels in U and L shape.

6. The three legged triangular fixture (10) as claimed in claim 1, wherein the length of the channel depends on dimensions of the required wind-box Upper and Lower panels.

7. A method for fit up of tubes on a three legged triangular fixture (10) for manufacturing of wind-box Upper and Lower panels of a high pressure and high temperature steam generator, the method consisting steps of:
(f) fixing top and bottom tubes as references to start fit up process;
(g) fixing first bent tube to position on the three legged triangular fixture (10);
(h) placing a corresponding bent fin alongside of the fixed first bent tube and tack welding the first bent tube;
(i) repeating the process of step (b) and (c) until the last tube and fins are tack welded to finish the fit up process; and
(j) welding the tack welded tubes and fins with welding process to manufacture of the wind-box Upper and Lower panels.

8. The method as claimed in claim 7, wherein the step (e) welding is done on both sides of the tack welded wind-box Upper and Lower panels.

9. The method as claimed in claim 7, wherein the step (c) of placing the bend tubes with bend ends facing downward to form wind-box upper and lower panels.

10. The method as claimed in claim 7, wherein the first bent tube is fit up to position on the fixture, the corresponding bent fin is placed alongside and tack welded to the tube.
, Description:THREE LEGGED TRIANGULAR FIXTURE FOR MANUFACTURING OF WIND-BOX UPPER AND LOWER PANELS WITH BENT TUBES AND PLATES FOR HIGH PRESSURE STEAM GENERATORS

FIELD OF THE INVENTION
[001] The present subject matter described herein, relates to a method of manufacturing wind-box upper and lower panels in high pressure steam generators. More particularly the present invention relates to a three legged triangular fixture used in manufacturing wind-box upper and lower panels in high pressure steam generators.
BACKGROUND OF THE INVENTION:
[002] Wind-box upper and lower panel assemblies are positioned in all four corners for joining water wall panels in high pressure steam generators. Figure 1 shows the line sketch of a Wind-box Upper/Lower panel. It is formed of Bent tubes 1 and plates 2. These tubes 1 and the plates 2 have both bend and twist at its ends making it difficult to form and manufacture. The tubes 1 and the plates 2 are first bent and then welded one by one from the first tube to the last bent tube. Positioning of these bent tubes and bent plates are difficult and time consuming. Earlier these panels were manufactured in workshops by placing loose tubes on a single plane platform with support at ends. It used to take more time and involves so many other resources.
[003] Accordingly, more time and resources are used to manufacture the panels. Due to loose tubes, accuracy of the panels also suffers. Hence to effectively manufacture these panels present subject matter provides technical solution for increasing the efficiency and accuracy of the panels. Accordingly, the present subject provides a indigenous fixture to aid the manufacturing of these panels.
OBJECTS OF THE INVENTION:
[004] The principal objective of the present invention is to provide a three legged triangular fixture for placing the bend tubes with bend ends facing downward to form wind-box upper and lower panels.

SUMMARY OF THE INVENTION
[005] The present subject matter relates to a three legged triangular fixture/strucutre for placing the bend tubes with bend ends facing downward to form wind-box upper and lower panels. The three legged triangular fixture is made in triangular shape with a support structure from top vortex to bottom. Further this structure is elevated to a single uniform plane by base support base. The three legged triangular structure is made according to the design of the panels. Further, the present subject matter relates a method for fabrication of the wind-box upper and lower panels using the three legged triangular structure. Firstly tubes are fixed at the top and bottom on the three legged triangular structure/fixture made to suit the final dimensions. Once these tubes are arrested then all other tubes in between are arranged according to the drawing dimensions with suitable fin fit up so as to maintain pitches at both ends and in the middle portion. Once fit up is completed, all the fitted tubes are fully welded on both sides and further operations followed.
[006] In order to further understand the characteristics and technical contents of the present subject matter, a description relating thereto will be made with reference to the accompanying drawings. However, the drawings are illustrative only but not used to limit scope of the present subject matter.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING
[007] 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, the left-most digit(s) of 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 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:
[008] Figure 1 shows the required product that is to be made through the present structure, in accordance with the present subject matter;
[009] Figure 2 shows the constructional features of the three legged triangular fixture/structure, in accordance with the present subject matter; and
[0010] Figure 3 shows the three legged triangular fixture being put on an elevated platform, in accordance with the present subject matter.
[0011] 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.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
[0012] The present subject matter relates to a three legged triangular fixture for manufacturing of wind-box Upper and Lower panels of a high pressure and high temperature steam generator. The three legged triangular fixture includes a first leg, a second leg, and a third leg or base leg. Further, one end of the third leg is welded with one end the first leg and other end of the third leg is welded with one end the second leg. Furthermore, other end of the first leg welded with other end of the second leg to form the three legged triangular fixture. The three legged triangular fixture has a fourth leg is welded in between the third leg at one end and other end is welded with the welding joint of the first leg and the second leg. The fourth leg is provided in the middle to support the centre and the structure. The triangular base of the three legged triangular fixture made of 150mm angles is provided to support and to elevate the three legged triangular fixture. The first leg, the second leg, the third leg, and the fourth leg are 150mm channels that are cut into shape for manufacturing of the three legged triangular fixture (10). The first leg, the second leg, the third leg, and the fourth leg are 150mm channels in U and L shape.

[0013] In another embodiment of the present subject matter a method for fit up of tubes on a three legged triangular fixture for manufacturing of wind-box Upper and Lower panels of a high pressure and high temperature steam generator. The method consisting steps of:
(a) fixing top and bottom tubes as references to start fit up process;
(b) fixing first bent tube to position on the three legged triangular fixture (10);
(c) placing a corresponding bent fin alongside of the fixed first bent tube and tack welding the first bent tube;
(d) repeating the process of step (b) and (c) until the last tube and fins are tack welded to finish the fit up process; and
(e) welding the tack welded tubes and fins with welding process to manufacture of the wind-box Upper and Lower panels.

[0014] The welding is done on both sides of the tack welded wind-box Upper and Lower panels. The placing the bend tubes with bend ends facing downward to form wind-box upper and lower panels.
[0015] 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.
[0016] 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.

[0017] The present invention is about making a fixture which consists of channels 150mm with item no’s 03, 04, 05 and 06 to form triangular structure and it is to be elevated to single uniform plane by a base structure with 150mm angles as mentioned in item no. 05, 06.

[0018] Referring to fig. 2, the three legged triangular fixture 10 for manufacturing of wind-box Upper and Lower panels of a high pressure and high temperature steam generator. The three legged triangular fixture 10 includes a first leg 03, a second leg 05, and a third leg or base leg 06. Further, one end of the third leg 06 is welded with one end the first leg 03 and other end of the third leg 06 is welded with one end the second leg 05. Furthermore, other end of the first leg 03 welded with other end of the second leg 05 to form the three legged triangular fixture 10. The three legged triangular fixture 10 has a fourth leg 04 is welded in between the third leg 05 at one end and other end is welded with the welding joint of the first leg 03 and the second leg 04. The fourth leg is provided in the middle to support the centre and the structure. The triangular base of the three legged triangular fixture made of 150mm angles is provided to support and to elevate the three legged triangular fixture. The first leg 03, the second leg 05, the third leg 06, and the fourth leg 04 are 150mm channels that are cut into shape for manufacturing of the three legged triangular fixture 10. The first leg 03, the second leg 05, the third leg 06 and the fourth leg 04 are 150mm channels in U and L shape.

[0019] The method for fitting up of tubes on a three legged triangular fixture for manufacturing of wind-box Upper and Lower panels of a high pressure and high temperature steam generator. The method consisting steps of fixing top and bottom tubes as references to start fit up process.
(1) fixing first bent tube to position on the three legged triangular fixture (10);
(2) placing a corresponding bent fin alongside of the fixed first bent tube and tack welding the first bent tube;
(3) repeating the process of step (b) and (c) until the last tube and fins are tack welded to finish the fit up process; and
(4) welding the tack welded tubes and fins with welding process to manufacture of the wind-box Upper and Lower panels.

[0020] The welding is done on both sides of the tack welded wind-box Upper and Lower panels. The placing the bend tubes with bend ends facing downward to form wind-box upper and lower panels.

[0021] By using this fixture the method of manufacturing wind-box upper, lower panels (Figure 1) can be done effectively through following steps.
1) 150 mm Channels (item no’s 03, 04, 05, 06) of required dimensions are taken and cut to Shape. The dimension required varies in accordance to the dimensions of the required panel (Figure 1).
2) Make a triangular fixture with the 150 mm channel as shown in fig 1 item no’s 03, 04, 05, and 06.The length of the channel varies in accordance to the dimensions of the required panel (Figure 1).
3) Then make uniform single plane base using 150 mm angles as shown in fig 2 item no.07, 08 and put triangular fixture on it.
4) Fit up of tubes by fixing top and bottom tubes as references to start fit up process.
5) First bent tube is fit up to position on the fixture, the corresponding bent fin is placed alongside and tack welded to the tube.
6) This process is repeated until the last tube and fins are tack welded to finish the fit up process.
7) Once fit up of tubes done according to dimensions of panels with certain fabrication allowance then welding is done on both sides and further operations are carried out.
[0022] 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.