Measuring tool

Abstract

A measuring tool 1 is configured to measure relative positioning defects between a first flange 7 of a first pipe 3 and a second flange 9 of a second pipe 5. The measuring tool 1 including a reference

Description

TITLE: MEASURING TOOL TECHNICAL FIELD The present application relates to a tool for measuring relative positioning defects between two pipes, more specifically a tool for measuring relative positioning defects between a first flange of a first pipe and a second flange of a second pipe distant from the first flange, as well as a method for measuring relative positioning defects between a first flange of a first pipe and a second flange of a second pipe distant from the first flange, using such a measuring tool. The invention in particular applies to the positioning defects configured to be adjusted by a compensator sleeve, preferably made of elastomer. STATE OF THE ART During the shutdown of a nuclear unit, the maintenance of the hydraulic circuits important for safety forms part of the activities with high safety issues for which compliance with the timing is essential. On these systems, the elastomer compensator sleeves (ECS) play an important role in ensuring the sealing of the junctions between two pipes. These devices ensure the recovery of dynamic and static stresses. The excessive stresses also contribute to their mechanical fatigue as well as to their wear and can lead to their rupture. On a nuclear site, the vibrations as well as the thermomechanical loads due to the passage of fluid at different temperatures are at the origin of these dynamic stresses. The main functions of an ECS are: - to protect the hydraulic circuit, by limiting the mechanical forces in the pipes, related to the dimensional variations in operation (thermal expansion, pressure / background effect, earthquake), - to absorb the vibrations, and to a lesser extent to reduce noise, and - to attenuate the effect of water hammer. The loads are absorbed by a specific bellows part made of flexible elastomer. The ECS manufacturers define maximum limitations for the defects recovered by an ECS. These defects are clearly identified by the manufacturers and the compliance with the tolerances is imperative in nuclear regulations. These defects are four in number: axial spacing also called expansion / compression, parallelism, alignment offset also called coaxiality defect, and angular offset also called torsion. The conformity of a mounting with respect to the regulation, for example the nuclear regulation, requires the compliance with the four tolerances. However, there is no device for measuring such defects in a quick and simple manner. DISCLOSURE OF THE INVENTION One aim of the present application is to overcome the aforementioned drawbacks, by proposing a measuring tool for measuring the relative positioning defects between a first flange of a first pipe and a second flange of a second pipe distant from the first flange, and this in a simple and quick manner. To this end, the invention proposes, according to a first aspect, a measuring tool configured to measure relative positioning defects between a first flange of a first pipe and a second flange of a second pipe distant from the first flange, the measuring tool comprising: - a reference flange, and - a measuring flange, a slide connection connecting the reference flange and the measuring flange, the reference flange being configured to be fixed on the first flange, the slide connection authorizing a sliding of the measuring flange relative to the reference flange along a reference axis, until the measuring flange is in contact with the second flange, the measuring flange carrying: - a first measuring indicator configured, when the measuring flange is in contact with the second flange, to indicate an axial spacing defect along the reference axis relative to a nominal axial spacing between the first flange and the second flange, and - a second measuring indicator configured, when the measuring flange is in contact with the second flange, to indicate an alignment offset between a first axis of the first flange and a second axis of the second flange and an angular offset about the reference axis between the first flange and the second flange. Thus, thanks to such a measuring tool, it is easy to measure the relative positioning defects between the first flange and the second flange. The axial spacing defect is measured thanks to the first measuring indicator, and the alignment offset defect and the angular offset defect are measured thanks to the second measuring indicator. Moreover, due to the contact of the measuring flange with the second flange, it is particularly easy to measure a parallelism defect a between the first flange and the second flange. Thus, it is sufficient to measure the maximum distance d between the measuring flange and the second flange, the maximum distance d being opposite to the contact between the measuring flange and the second flange, then to apply the formula: a = sin_1(d I Dext), where: a is the parallelism defect, d is the maximum distance measured between the measuring flange and the second flange, Dext is the outside diameter of the second flange. A measuring tool is therefore provided for measuring the relative positioning defects between a first flange of a first pipe and a second flange of a second pipe distant from the first flange in a simple and quick manner. According to a second aspect, the invention proposes a method for measuring relative positioning defects between a first flange of a first pipe and a second flange of a second pipe distant from the first flange, the method comprising the following steps: - when an elastomer compensator sleeve is installed between the first flange and the second flange, dismounting the elastomer compensator sleeve, - mounting the measuring tool in accordance with the first aspect on the first flange, positioning and fixing the reference flange on the first flange, - sliding the measuring flange relative to the reference flange until the measuring flange is in contact with the second flange, then holding in position the measuring flange relative to the reference flange, - measuring an axial spacing defect along the reference axis between the first flange and the second flange by means of the first measuring indicator, - measuring an alignment offset defect between a first axis of the first flange and a second axis of the second flange and an angular offset defect between the first flange and the second flange by means of the second measuring indicator, - measuring a parallelism defect between the first flange and the second flange, by measuring the maximum distance d between the measuring flange and the second flange, the maximum distance d being opposite to a point of contact between the measuring flange and the second flange. The invention is advantageously and optionally supplemented by the following characteristics, taken alone or in any one of their technically possible combinations: - The measuring tool includes at least one positioning element configured to position the reference flange on the first flange, preferably at least one pair of positioning elements diametrically opposite relative to the reference axis, more preferably two, three, four, five or six pairs of positioning elements diametrically opposite relative to the reference axis. Thus, the setting up of the reference flange on the first flange is facilitated. The measuring tool is thus simpler to set up. - Each positioning element is axially engaged in a through hole of the reference flange and is configured to pass through a through hole of the first flange. - Each positioning element is a pin. Thus, the use of pins as positioning elements is particularly simple and makes it possible to center the reference flange on the first flange. - The diameter of the pin is set, preferably equal, to the diameter of the through hole of the reference flange and to the diameter of the through hole of the first flange. Thus, the positioning is particularly accurate. - The measuring tool includes at least one fixing element configured to fix the reference flange on the first flange, preferably at least one pair of fixing elements diametrically opposite relative to the reference axis, more preferably two, three, four, five or six pairs of fixing elements diametrically opposite relative to the reference axis. Thus, the measurement via the measuring tool is easier to take because the measuring tool is fixed on the first flange. - Each fixing element is axially engaged in a through hole of the reference flange and is configured to pass through a through hole of the first flange. - Each fixing element is a bolt. Thus, the fixing element is particularly simple. - One among the reference flange or the measuring flange includes a male plug, the other among the measuring flange or the reference flange including a female socket, the male plug being slidably mounted in the female socket to make the slide connection. Thus, the slide connection is made in a simple and accurate manner. - The male plug comprises two opposite dovetails connected to each other by a spacer. Thus, the accuracy of the slide connection is improved. - The female socket includes at least one guide gib, preferably two identical guide gibs. Thus, the accuracy of the slide connection is improved. - The female socket includes a stop and the male plug comprises an oblong groove extending longitudinally along the reference axis, the stop being slidably mounted in the oblong groove along the reference axis. Thus, the first measuring indicator can be at least partially formed by the stop. Indeed, the longitudinal dimension of the oblong groove can correspond to the maximum permissible axial spacing defects along the reference axis relative to a nominal axial spacing between the first flange and the second flange, these maximum permissible defects corresponding for example to the maximum defects likely to be adjusted for by a compensation sleeve such as an ECS. In this case, when the stop reaches one of the ends of the oblong groove before the measuring tool is disposed between the first flange and the second flange such that the measuring flange comes into contact with the second flange, it is already determined that a compensation sleeve will not be able to adjust the relative positioning defect. - The stop is formed by a dog point screw. Thus, the stop is made in a particularly simple manner. - The reference flange includes a reference disk. - The measuring flange includes a measuring disk. - The reference disk is identical to the measuring disk. - The reference disk includes at least one pair of through holes diametrically opposite relative to the reference axis. Thus, the reference flange can be easily positioned and fixed on the first flange. Indeed, the pipe flanges, particularly the first flange and the second flange, conventionally comprise several pairs of through holes. - The measuring disk includes at least one pair of through holes diametrically opposite to the reference axis. - The measuring disk comprises the second measuring indicator, which indicates the angular offset of each through hole of the measuring disk and is configured for measuring the angular offset about the reference axis between the through hole of the measuring disk and a through hole of the second flange. Thus, the measurement of the angular offset can be taken easily. - The second flange of the second pipe is distant from the first flange in order to connect the first pipe to the second pipe by a compensation sleeve fixed on the first flange and on the second flange. - In the absence of a relative positioning defect between the first flange and the second flange, a compensation sleeve can be mounted between the first flange and the second flange and can be fixed on the first flange and on the second flange. - The reference disk is radially surmounted by a radial positioning stop, preferably by a ferrule portion. Thus, the positioning of the reference flange is facilitated. - The radial positioning stop is configured to have a complementary shape with the first flange such that the radial positioning stop is radially bearing on the first flange when the reference flange is positioned on the first flange. - The ferrule portion extends in an arc about the reference axis, preferably the arc being equal to 180°. - The slide connection connects the measuring flange to the reference flange. - The measuring flange is movable relative to the reference flange only by sliding along the reference axis, the sliding being ensured by the slide connection. - The reference flange and the measuring flange form the slide connection therebetween; - The slide connection requires a sliding of the measuring flange relative to the reference flange along the reference axis. - The male plug extends directly from the reference disk and the female socket extends directly from the measuring disk, or the female socket extends directly from the reference disk and the male plug extends directly from the measuring disk. DESCRIPTION OF THE FIGURES Other characteristics, aims and advantages of the invention will emerge from the detailed description below, which is purely illustrative and non-limiting, and which should be read in relation to the appended drawings, given as non-limiting examples and in which: [Fig. 1] represents a schematic view of a measuring tool in accordance with one embodiment, disposed between a first flange of a first pipe and a second flange of a second pipe distant from the first flange; [Fig. 2] represents two schematic perspective views of a reference flange of the measuring tool represented in Figure 1; [Fig. 3] represents a schematic perspective view of a measuring flange of the measuring tool represented in Figure 1; [Fig. 4] represents a positioning element of a measuring tool in accordance with one embodiment; [Fig. 5] is a schematic side view of the measuring flange represented in Figure 3; [Fig. 6] represents a guide gib of a measuring tool in accordance with one embodiment; [Fig. 7] is a diagram of one exemplary embodiment of a measuring method in accordance with one embodiment. In all the figures, similar elements bear identical references. DETAILED DESCRIPTION Figure 1 represents a measuring tool 1 in accordance with one embodiment, disposed between a first pipe 3 and a second pipe 5. More specifically, the measuring tool 1 is disposed between a first flange 7 of the first pipe 3 and a second flange 9 of the second pipe 5 distant from the first flange 7. The second flange 9 is distant from the first flange 7 in order to connect the first pipe 3 to the second pipe 5 by a compensation sleeve 11 fixed on the first flange 7 and on the second flange 9. In this example, the diameter of the first flange 7 is equal to the diameter of the second flange 9. The measuring tool 1 is configured to measure relative positioning defects between the first flange 7 and the second flange 9. In the absence of a defect, even in the absence of an out-of-tolerance defect, of a relative positioning defect between the first flange 7 and the second flange 9, a compensation sleeve can be mounted between the first flange 7 and the second flange 9 and can be fixed on the first flange 7 and on the second flange 9. The measuring tool 1 comprises a reference flange 11, also represented in Figure 2, and a measuring flange 13, also represented in Figure 3. As represented in Figure 1, a slide connection connects the reference flange 11 and the measuring flange 13. The reference flange 11 is configured to be fixed, preferably accurately, on the first flange 7. The slide connection authorizes a sliding of the measuring flange 13 relative to the reference flange 11 along a reference axis X, until the measuring flange 13 is in contact with the second flange 9. The measuring tool 1 includes at least one positioning element 15 configured to position the reference flange 11 on the first flange 7, preferably at least one pair of positioning elements 15 diametrically opposite relative to the reference axis X, more preferably two, three, four, five or six pairs of positioning elements 15 diametrically opposite relative to the reference axis X. In this example, as represented in Figure 4, each positioning element 15 is a pin. For example, the reference flange 11 is positioned on the first flange 7 via a pair of pins. Each positioning element 15 is axially engaged in a through hole 17 of the reference flange 11 and is configured to pass through a through hole 19 of the first flange 7. In this example, each pin has for example a calibrated body fitted to the through holes 17 and a head. Advantageously, the diameter of the pin is fitted, preferably equal, to the diameter of the through hole 17 of the reference flange 11 and to the diameter of the through hole 19 of the first flange 7. Moreover, as represented in Figure 1, the measuring tool 1 includes at least one fixing element 21 configured to fix the reference flange 11 on the first flange 7, preferably at least one pair of fixing elements 21 diametrically opposite relative to the reference axis X, more preferably two, three, four, five or six pairs of fixing elements 21 diametrically opposite relative to the reference axis X. Each fixing element 21 is axially engaged in a through hole 17 of the reference flange 11 and is configured to pass through a through hole 19 of the first flange 7. In this example, each fixing element 21 is a bolt. For example, the reference flange 11 is fixed on the first flange 7 via a pair of bolts. The measuring flange 13 carries a first measuring indicator 22, which is represented in Figure 5. The first measuring indicator 22 is configured, when the measuring flange 13 is in contact with the second flange 9, to indicate an axial spacing defect along the reference axis X relative to a nominal axial spacing between the first flange 7 and the second flange 9. In this example, the first measuring indicator 22 is formed by a graduated ruler, whose zero is positioned at the nominal axial spacing, i.e. the standard length of the ECS, for example the length of the ECS in the absence of stress. The measuring flange 13 also carries a second measuring indicator 23. The second measuring indicator 23 is configured, when the measuring flange 13 is in contact with the second flange 9, to indicate an alignment offset between a first axis R of the first flange 7 and a second axis M of the second flange 9 and an angular offset about the reference axis X between the first flange 7 and the second flange 9. When the measuring tool 1 is positioned and fixed on the first flange 7, the reference axis X coincides with the first axis R. In this example, the second measuring indicator 23 is formed by a number of pairs of graduations disposed around the measuring flange 13 and diametrically opposite, whose number corresponds for example to the number of pairs of diametrically opposite through holes 51 of the second flange 9. The zero of each graduation is aligned with a marking made around the second flange 9 in the absence of an angular offset between the measuring flange 13 and the second flange 9. Furthermore, one among the reference flange 11 or the measuring flange 13 includes a male plug 24, the other among the measuring flange 13 or the reference flange 11 including a female socket 25. In this example, the measuring flange 13 includes the male plug 24, and the reference flange 11 includes the female socket 25. The slide connection connects the measuring flange 13 to the reference flange 11. In other words, the reference flange 11 and the measuring flange 13 form the slide connection therebetween. The male plug 24 is slidably mounted in the female socket 25 to make the slide connection. In other words, the measuring flange 13 is movable relative to the reference flange 11 only by sliding along the reference axis X, the sliding being ensured by the slide connection. Thus, the slide connection imposes a sliding of the measuring flange 13 relative to the reference flange 11 along the reference axis X. For this, the male plug 24 comprises two opposite dovetails 27 connected to each other by a spacer 29, and the female socket 25 includes at least one guide gib 31, represented in Figure 6, preferably two identical guide gibs 31. Each guide gib 31 is engaged in a housing 33 of the female socket 25. Each guide gib 31 is moreover pressed against a corresponding dovetail 27 of the male plug 24, thanks to screws engaged in threaded holes 35 opening out into the housing 33, preferably two screws engaged in two threaded holes 35, as represented in Figure 2. These screws thus make it possible to hold in position the measuring flange 13 relative to the reference flange 11, in particular once the measuring flange 13 is in contact with the second flange 9. The female socket 25 moreover includes a stop 37. In this example, the stop 37 is formed by a dog point screw, which is engaged in a threaded hole 39. The male plug 24 also comprises an oblong groove 41 extending longitudinally along the reference axis X. The stop 37 is slidably mounted in the oblong groove 41 along the reference axis X. As represented in particular in Figure 2, the reference flange 11 includes a reference disk 43. In this example, the diameter of the reference disk 43 is equal to the diameter of the first flange 7. The reference disk 43 includes at least one pair of through holes 17 diametrically opposite relative to the reference axis X, in this example four pairs of through holes 17 diametrically opposite relative to the reference axis X. The through holes 17 are configured to be aligned with the through holes 19 when the reference flange 11 is positioned and fixed on the first flange 7. The reference disk 43 is also surmounted radially by a radial positioning stop 45. Thus, the reference flange 11 includes the reference disk 43, from which the female socket 25 extends axially, and around which the radial positioning stop 45 extends. The radial positioning stop 45 is configured to have a shape complementarity with the first flange 7 such that the radial positioning stop 45 is radially bearing on the first flange 7 when the reference flange 11 is positioned on the first flange 7. In this example, the radial positioning stop 45 is a ferrule portion. The ferrule portion extends in an arc about the reference axis X, preferably the arc being equal to 180°. As represented in particular in Figure 3, the measuring flange 13 includes a measuring disk 47. Thus, the measuring flange 13 includes the measuring disk 47, from which the male plug 24 extends axially. Thus, the female socket 25 extends directly from the reference disk 43 and the male plug 24 extends directly from the measuring disk 47. Alternatively, the male plug 24 extends directly from the reference disk 43 and the female socket 25 extends directly from the measuring disk 47. In this example, the diameter of the measuring disk 47 is equal to the diameter of the second flange 9. In this example, the measuring disk 47 and the reference disk 43 are identical. The measuring disk 47 includes at least one pair of through holes 49 diametrically opposite relative to the reference axis X, preferably two, three, four, five or six pairs of through holes 49 diametrically opposite relative to the reference axis X. For example, the measuring disk 47 comprises the same number of through holes as the second flange 9. Thus, when the measuring disk 47 is aligned without angular offset with the second flange 9, the through holes 49 of the measuring disk 47 are aligned with the through holes 51 of the second flange 9. In the example represented, the measuring disk 43 includes four pairs of through holes 49 diametrically opposite relative to the reference axis X. The measuring disk 47 comprises the second measuring indicator 23, which indicates the angular offset of each through hole 49 of the measuring disk 47 and configured for measuring the angular offset about the reference axis X between the through hole 49 of the measuring disk 47 and a through hole 51 of the second flange 9. Figure 7 represents the main steps of a method for measuring relative positioning defects between a first flange 7 of a first pipe 3 and a second flange 9 of a second pipe 5 distant from the first flange 7. Thus, the measuring tool 1 previously described is configured to implement the measuring method described below. Such a measuring method includes for example the following steps: - P1 when an elastomer compensator sleeve is installed between the first flange 7 and the second flange 9, dismounting the elastomer compensator sleeve, - P11 mounting the measuring tool 1 previously described on the first flange 7, positioning and fixing the reference flange 11 on the first flange 7, - P20 sliding the measuring flange 13 relative to the reference flange 11 until the measuring flange 13 is in contact with the second flange 9, then holding in position the measuring flange 13 relative to the reference flange 11, - P30 measuring an axial spacing defect along the reference axis X between the first flange 7 and the second flange 9 by means of the first measuring indicator 22, - P40 measuring an alignment offset defect between a first axis R of the first flange 7 and a second axis M of the second flange 9 and an angular offset defect between the first flange 7 and the second flange 9 by means of the second measuring indicator 23, - P50 measuring a parallelism defect between the first flange 7 and the second flange 9, by measuring the maximum distance d between the measuring flange 13 and the second flange 9, the maximum distance d being located opposite to the contact, more specifically opposite to a contact point, between the measuring flange 13 and the second flange 9. For example, the detection method further includes the following steps: - Prior to step P11, P10 mounting the measuring tool 1 previously described on the second flange 9, positioning the measuring flange 13 on the second flange 9 by means of positioning elements 15, optionally fixing the measuring flange 13 on the second flange 9 by means of fixing elements 21, making several markings on the second flange 9, each marking being aligned with each zero of the graduations of the second measuring indicator 23, removing the positioning elements 15, optionally removing the fixing elements 21, and dismounting the measuring tool 1 from the second flange 9. - Step P50 is followed by a step P51 of calculating the parallelism defect by applying the formula: a = sin1 (d / Dext), where: a is the parallelism defect, d is the maximum distance measured between the measuring flange 13 and the second flange 9, Dext is the outside diameter of the second flange 9. - Step P40 is followed by a step P41 of calculating the angular offset by applying the formula! = 7X0 + T’GO], where: t is the angular offset, n is the number of pairs of diametrically opposite graduations, i, i’ is a pair of diametrically opposite graduations, T(i) is the measurement of the angular value of the graduation i relative to the corresponding marking made around the second flange 9. n is for example comprised between 1 and 6. In this example, n is equal to 4, and the pairs of diametrically opposite graduations are placed correspondingly to the diametrically opposite through holes 51, for example highlighted in Figure 3 by the letters A, A’; B, B’; C, C’; D, D’. - Step P40 is followed by a step P42 of calculating the alignment offset by applying the 5 formulae = where: c is the alignment offset, n is the number of pairs of diametrically opposite graduations, i, i’ is a pair of diametrically opposite graduations, 10 T(i) is the measurement of the angular value of the graduation i relative to the corresponding marking made around the second flange 9. n is for example comprised between 1 and 6. In this example, n is equal to 4, and the pairs of diametrically opposite graduations are placed correspondingly to the diametrically opposite through holes 51, for example highlighted in Figure 3 by the letters A, A’; B, B’; C, C’; D, D’.

Claims

1. A measuring tool (1) configured to measure relative positioning defects between a first flange (7) of a first pipe (3) and a second flange (9) of a second pipe (5) distant from the first flange (7), the measuring tool (1) being characterized in that it comprises:- a reference flange (11), and- a measuring flange (13),- a slide connection connecting the reference flange (11) and the measuring flange (13),- the reference flange (11) being configured to be fixed on the first flange (7), the slide connection authorizing a sliding of the measuring flange (13) relative to the reference flange (11) along a reference axis X, until the measuring flange (13) is in contact with the second flange (9),- the measuring flange (13) carrying:- a first measuring indicator (22) configured, when the measuring flange (13) is in contact with the second flange (9), to indicate an axial spacing defect along the reference axis X relative to a nominal axial spacing between the first flange (7) and the second flange (9), and - a second measuring indicator (23) configured, when the measuring flange (13) is in contact with the second flange (9), to indicate an alignment offset between a first axis R of the first flange (7) and a second axis M of the second flange (9) and an angular offset about the reference axis X between the first flange (7) and the second flange (9).

2. The measuring tool (1) according to claim 1, which includes at least one positioningelement (15) configured to position the reference flange (11) on the first flange (7).

3. The measuring tool (1) according to claim 1 or 2, which includes at least one fixingelement (21) configured to fix the reference flange (11) on the first flange (7).

4. The measuring tool (1) according to any one of claims 1 to 3, wherein one among the reference flange (11) or the measuring flange (13) includes a male plug (24), the other among the measuring flange (13) or the reference flange (11) including a female socket (25), the male plug (24) being slidably mounted in the female socket (25) to make the slide connection.

5. The measuring tool (1) according to claim 4, wherein the male plug (24) comprises two opposite dovetails (27) connected to each other by a spacer (29).

6. The measuring tool (1) according to claim 4 or 5, wherein the female socket (25) includes at least one guide gib (31), preferably two identical guide gibs (31).

7. The measuring tool (1) according to any one of claims 4 to 6, wherein the female socket (25) includes a stop (37) and the male plug (24) comprises an oblong groove (41) extending longitudinally along the reference axis X, the stop (37) being slidably mounted in the oblong groove (41) along the reference axis X to form the first measuring indicator (22).

8. The measuring tool (1) according to any one of claims 1 to 7, wherein:- the reference flange (11) includes a reference disk (43),- the measuring flange (13) includes a measuring disk (47),the reference disk (43) and the measuring disk (47) each including at least one pair of through holes (17, 49) diametrically opposite relative to the reference axis X.

9. The measuring tool (1) according to claim 8, wherein the measuring disk (47) comprises the second measuring indicator (23), which indicates the angular offset of each through hole (49) of the measuring disk (47) and configured for measuring the angular offset about the reference axis X between the through hole (49) of the measuring disk (47) and a through hole (51) of the second flange (9).

10. A method for measuring relative positioning defects between a first flange (7) of a first pipe (3) and a second flange (9) of a second pipe (5) distant from the first flange (7), the method comprising the following steps:- mounting the measuring tool (1) according to any one of claims 1 to 9 on the first flange (7), positioning and fixing the reference flange (11) on the first flange (7),- sliding the measuring flange (13) relative to the reference flange (11) until the measuring flange (13) is in contact with the second flange (9), then holding in position the measuring flange (13) relative to the reference flange (11),- measuring an axial spacing defect along the reference axis X between the first flange (7) and the second flange (9) by means of the first measuring indicator (22),- measuring an alignment offset defect between a first axis R of the first flange (7) and a second axis M of the second flange (9) and an angular offset defect between the first flange (7) and the second flange (9) by means of the second measuring indicator (23),- measuring a parallelism defect between the first flange (7) and the second flange (9), by measuring the maximum distance d between the measuring flange (13) and the second flange (9), the maximum distance d being opposite to a point of contact between the measuring flange (13) and the second flange (9).

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