DE102019116948A1 - Jet pipe assembly and method of assembling the jet pipe assembly - Google Patents

Abstract

The invention relates to a jet pipe arrangement (10) for a furnace, comprising a ceramic jet pipe (11) which is provided at the end with a radially outwardly projecting, circumferential clamping ring (12), a jet pipe flange (20), at least one clamping element (30) and a plurality of connecting devices (40; 41), each having a spring element (50; 51). The clamping ring (12) is resiliently clamped between the at least one clamping element (30) and the jet pipe flange (20) by means of the multiple connecting devices (40; 41), and there is a seal at least between the clamping ring (12) and the jet pipe flange (20) (70) arranged. The connecting devices (40; 41) each have means for installation in the jet pipe arrangement (10) with a spring element (50; 51) in a pretensioned state and means for actuation by which the connecting devices (40; 41) by means of their spring elements ( 50; 51) cause a resilient clamping of the clamping ring (12) between the at least one clamping element (30) and the jet pipe flange (20).

Description

The invention relates to a jet pipe arrangement according to the preamble of claim 1 for a furnace, in particular for a furnace that can be operated with a fuel, comprising a jet pipe flange and a ceramic jet pipe with a clamping ring located on the jet pipe, the clamping ring being resilient and sealing by means of at least one connecting device is connected to the jet pipe flange. The jet pipe flange is used to connect the jet pipe to a furnace flange, which in turn can be connected to a furnace wall.

The invention also relates to a method for assembling such a jet pipe arrangement.

In the indirect heating of industrial furnaces, burners with radiant tubes are often used, which are passed through an opening in the furnace wall of the furnace and protrude into the furnace chamber. In order to make this introduction of a radiant tube as gas-tight as possible, a furnace flange made of a metallic material is often sealed off from the radiant tube. This is to prevent exhaust gases from escaping to the outside. It is therefore necessary to provide a reliable seal between the radiant tube and the furnace flange. For this purpose, a jet pipe flange is connected to the jet pipe, which is typically made of the same metallic material as the furnace flange. Radiant tube flange and furnace flange are connected to one another in a sealing manner.

In doing so, however, the high thermal loads in industrial furnaces must be taken into account, and thermal expansion of the components must be possible without increasing mechanical stresses which could disadvantageously damage the radiant tube arrangement in long-term operation. Furthermore, the jet pipe arrangement must reliably take up the weight of the jet pipe which protrudes into the furnace space. Mechanical loads must therefore also be taken into account in the type of seal. In particular, the different thermal expansions of the component materials used must be taken into account. The jet pipe is made of a ceramic material, while the jet pipe flange is made of a metallic material. Since metal expands about 4 times more than e.g. a ceramic like SiSiC, a gap forms between the components at high temperatures. As a result, a seal is relieved and leaks. In order to compensate for the different thermal expansions of the various components, connecting devices with a resilient effect are therefore often used.

Various solutions are known from the prior art which propose a jet pipe arrangement with a resilient connection for this purpose. For example, the DE 10 2014 110 607 A1 a jet pipe arrangement with a ceramic jet pipe which is provided at the end with a circumferential clamping ring. Furthermore, an oven flange, a detachable closure element and at least one spring element are provided. The clamping ring is held against the furnace flange under spring tension by means of the closure element and the spring element prestressed by it. Furthermore, a spacer sleeve is provided which at least partially surrounds the clamping ring and has a stop for the at least one spring element or the closure element.

From the DE 10 2008 048 972 A1 Furthermore, a jet pipe arrangement is known which also has a jet pipe with an annular body at the end and a connecting device with which the jet pipe is connected via the ring body to a furnace flange. For this purpose, the connecting device has at least one spring washer with several resilient areas, via which the furnace flange is connected to the spring washer.

The DE 198 08 405 A1 discloses a generic jet pipe arrangement in which several connecting devices each have a screw that is screwed into a tensioning element against the spring force of a spring assembly during assembly of the jet pipe arrangement, whereby a clamping ring on the jet pipe is clamped between the tensioning element and a jet pipe flange in a sealing manner.

The head of the screw and the spring assembly are located in a recess in the jet pipe flange that extends in the axial direction.

The object of the invention is to provide an improved radiant tube arrangement for a furnace which reliably ensures tightness between a radiant tube flange and a radiant tube in the event of high thermal and mechanical loads.

According to the invention, this object is achieved by a jet pipe arrangement according to independent claim 1. Advantageous further developments of the jet pipe arrangement emerge from the dependent claims 2-13. The object is also achieved by a method for assembling the jet pipe arrangement according to independent claim 14.

It should be pointed out that the features listed individually in the claims can be combined with one another in any technically meaningful manner and show further embodiments of the invention. The description additionally characterizes and specifies the invention, in particular in connection with the figures.

The jet pipe arrangement according to the invention for a furnace has a ceramic jet pipe which is provided at the end with a circumferential clamping ring projecting radially outward. This clamping ring is siliconized, for example. The jet pipe arrangement also has a jet pipe flange, at least one tensioning element and a plurality of connecting devices, each of which includes a spring element. The clamping ring is resiliently clamped between the at least one clamping element and the jet pipe flange by means of the plurality of connecting devices. Furthermore, a seal is arranged at least between the clamping ring and the jet pipe flange. A seal is preferably also arranged between the clamping ring and the at least one tensioning element. The jet pipe is pressed against the jet pipe flange via the at least one tensioning element, this connection being designed to be sealing and resilient. The clamping and suspension is preferably carried out in the axial direction with respect to the longitudinal axis of the jet pipe. Different thermal expansions of the materials of the ceramic radiant tube and of a metallic radiant tube flange are compensated for by the spring action of the at least one spring element.

According to the invention, it is provided that the connecting devices each have means for installation in the jet pipe arrangement with a spring element in a pretensioned state and means for actuation, by means of which the connecting devices effect a resilient clamping of the clamping ring between the at least one clamping element and the jet pipe flange by means of their spring elements. A spring element of a connecting device is thus not only deformed against its spring force when the connecting device is actuated to clamp the clamping ring, but the connecting devices are designed so that they can be mounted with an already pretensioned spring element. After assembly within the arrangement, the connecting devices are actuated in order to resiliently clamp the clamping ring. This preferably causes a further increase in the spring tension, in particular until shortly before the spring element is blocked. The spring element can relax over time due to settling losses in the seals used. A connection device can be operated, for example, by tightening a screw and / or a nut.

Several clamping elements can be used, each of which is clamped to the clamping ring by a connecting device. In alternative embodiments, there is a single clamping element which is clamped to the clamping ring by several connecting devices. In the second case, it is preferably a clamping ring through which the jet pipe is guided coaxially. The connecting devices are then arranged, for example, in a circle around the jet pipe.

The invention has the advantage that a pretensioned spring element requires less installation space for assembly than a non-pretensioned spring element. A spring element is preferably formed in each case by a spring assembly made up of several cup springs, which are compressed for a pretensioning. This stack of pre-tensioned disc springs has a lower height in the axial direction than a non-pre-tensioned stack of disc springs. The same also applies to a spiral spring or other types of suitable spring elements. If, in one embodiment of the invention, 8 to 10 disc springs are used in a spring assembly and these have, for example, an effective spring travel of 4 mm, a residual clamping force of 90% remains with a gap of 0.4 mm resulting from a temperature increase.

The jet pipe arrangement according to the invention can be used, for example, in a furnace that can be operated with a fuel. With the invention, the jet pipe flange is tight to the outside of the furnace, so that no exhaust gases can penetrate to the outside. However, the jet pipe arrangement can also be used in a furnace that is operated electrically. Then electric heating cartridges are inserted into the ceramic radiant tubes. The invention can also be used advantageously in an electrically operated furnace without combustion exhaust gases, for example to maintain a suitable protective gas atmosphere in the furnace, which is not impaired by escaping protective gas or incoming outside air due to the sealing by means of the jet pipe arrangement.

Spring elements of generic jet pipe arrangements typically have pockets or receptacles in which the spring elements and other parts of the connecting devices are received. A pretensioned spring element therefore requires receptacles, pockets, etc., whose size can be reduced to a minimum in the axial direction, in order to be accommodated in the jet pipe flange. In this way, the axial expansion of the jet pipe flange can also be minimized, which leads to an advantageous saving in material and weight.

Pockets for receiving at least the spring elements of the connecting devices can be designed in various ways. In one embodiment of the invention, the Spring elements of the connecting devices arranged in a pocket which is designed to be open towards the jet pipe. Such a pocket is formed at least by a clamping plate and a sealing plate on the flange, which run radially and are axially spaced from one another. The two plates fulfill different functions. When the connecting devices are actuated, the spring assemblies are supported on the clamping plate of a pocket, while the clamping ring can be supported on the sealing plate of a pocket via a first seal.

For example, the jet pipe flange has several such pockets, in each of which one or more spring elements are accommodated. In a preferred embodiment of the invention, however, the pocket is a single pocket which runs around the inside of the jet pipe flange and in which the spring elements of all connecting devices are arranged. The plates are then two plate rings that form a kind of groove running around the inside of the flange between them.

The bias of a spring element in a connecting device can also be achieved in various ways. In one embodiment of the invention, the connecting devices each have a prestressing element against which their spring element can be prestressed. In particular, it can be prestressed against the prestressing element with a screw, the head of the screw serving as a stop. For example, the screw is guided through the spring element and screwed into the prestressing element to such an extent that the desired prestressing is achieved. The prestressing element has, for example, the shape of a bolt with an external thread at the end, onto which a nut can be screwed for actuating the connecting device.

In a preferred embodiment of the invention, the connecting devices are also each guided through a receptacle in the jet pipe flange and a receptacle in the clamping element. These recordings can be closed bores, which, however, complicates the assembly of the connecting devices depending on the pocket used. Preferably, at least the receptacle in the jet pipe flange is a radially extending indentation in the form of a slot. This slot is located in the clamping plate when using a pocket. The receptacle in the clamping element can also be a slot running in the radial direction. If a bolt with an external thread is used as the prestressing element, a screw is passed through the spring element and screwed into the bolt. Such a bolt is also referred to below as a prestressing bolt. The screw is screwed in until the desired preload of the spring element is achieved. The connecting device pretensioned in this way is introduced into the jet pipe arrangement by inserting the bolt into the two receptacles in the clamping element and in the jet pipe flange (clamping plate), with the screw head and spring element in the associated pocket. The bolt protrudes with its external thread from the receptacle in the clamping element so that a nut can be screwed on. By tightening the nut, the spring element in the pocket is pulled against the clamping plate of the pocket.

In one embodiment of the invention, the connecting devices are each secured against twisting with respect to the jet pipe flange and / or the clamping element. In the embodiment described above with a bolt as the pretensioning element, this can take place in that the bolt is held in a rotationally fixed manner in at least one of the receptacles due to its cross sectional geometry. A nut can then be tightened to 10 Nm, for example.

In order to save further space, one embodiment of the invention provides that a spring assembly made up of a plurality of cup springs is cut into at least one side facing the jet pipe. This means that the spring assembly is not designed to be rotationally symmetrical, but rather it is flattened on one side. With this flattened side, it is positioned as close as possible to the nozzle. This allows the material of the clamping ring to be saved, since the connecting devices can be placed very close to the jet pipe. Optionally, the side of a spring assembly facing away from the jet pipe is also designed to be flattened in order to enable further space savings in the radial direction.

The invention not only leads to a saving of space and thus material, but it also improves the assembly process for the production of the jet pipe arrangement. The pre-tensioning of the spring elements significantly accelerates the assembly process, which leads to a time saving of approx. 50%. If the components of the arrangement are designed accordingly, the assembly itself is also simplified. First, the jet pipe flange is placed on a base and the connecting devices with their pre-tensioned spring elements are inserted into the inner circumferential pocket on the flange. Then the jet pipe with its seals is inserted into the flange from above. The clamping ring is placed over the jet pipe, with the connecting devices being guided through receptacles in the clamping ring. Nuts are turned onto the external thread of the preload bolt protruding from the clamping ring and tightened. This is a simple and safe process in which components are placed one after the other at a comfortable height placed and not have to be held upside down, for example.

• - Vorspannen jeweils eines Federelementes in den mehreren Verbindungseinrichtungen und nachfolgendes Einbringen der Verbindungseinrichtungen in vorgesehene Positionen gegenüber dem Strahlrohrflansch, wobei dies vorzugsweise verdrehsicher erfolgt,
• - Einbringen wenigstens eines Spannelementes in eine vorgesehene Position gegenüber dem Strahlrohr und dem Strahlrohrflansch,
• - Einbringen einer ersten Dichtung zwischen dem Klemmring des Strahlrohres und dem Strahlrohrflansch,
• - Einbringen des Strahlrohrs in eine vorgesehene Position gegenüber dem Strahlrohrflansch,
• - Einbringen einer zweiten Dichtung zwischen dem Klemmring des Strahlrohres und dem wenigstens eine Spannelement, und
• - Betätigen der Verbindungseinrichtungen, wodurch der Klemmring des Strahlrohrs federnd und dichtend zwischen dem wenigstens einen Spannelement und dem Strahlrohrflansch eingespannt wird.

The invention therefore also encompasses a method for assembling a jet pipe arrangement with the provision of a jet pipe, a jet pipe flange, at least one tensioning element and a plurality of connecting devices with respective spring elements. These components are designed according to one of the described embodiments. The method has at least the following steps:

• - Pre-tensioning of one spring element in each case in the multiple connecting devices and subsequent introduction of the connecting devices into the intended positions relative to the jet pipe flange, this preferably being done in a non-rotating manner,
• - Insertion of at least one clamping element in a provided position opposite the jet pipe and the jet pipe flange,
• - Introducing a first seal between the clamping ring of the jet pipe and the jet pipe flange,
• - Bringing the jet pipe into an intended position opposite the jet pipe flange,
• - Introducing a second seal between the clamping ring of the jet pipe and the at least one clamping element, and
• - Actuation of the connecting devices, whereby the clamping ring of the jet pipe is clamped in a resilient and sealing manner between the at least one clamping element and the jet pipe flange.

The steps do not have to be carried out in the specified sequence, but merely the introduction of the connecting devices into the intended positions relative to the jet pipe flange takes place after the preloading of a spring element in each of the multiple connecting devices. However, the introduction does not have to take place directly after the prestressing, but further steps can be interposed. The method has the advantages described in terms of time savings and simple assembly of the jet pipe arrangement.

Further advantages, special features and expedient developments of the invention emerge from the subclaims and the following illustration of preferred exemplary embodiments on the basis of the figures.

• 1 eine Ausführungsform einer Strahlrohranordnung gemäß der Erfindung in einer Seitenansicht;
• 2 einen Schnitt A-A durch eine Strahlrohranordnung gemäß 1;
• 3 eine dreidimensionale Ansicht des Schnitts A-A durch eine Strahlrohranordnung gemäß 1;
• 4 eine Aufsicht auf eine Verbindungseinrichtung mit einem Federelement;
• 5 einen Schnitt B-B durch eine Verbindungseinrichtung gemäß 4;
• 6 eine dreidimensionale Ansicht der Verbindungseinrichtung gemäß 4;
• 7 eine dreidimensionale Ansicht der Verbindungseinrichtung gemäß 4 mit geschnittenem Federelement und geschnittenem Vorspannelement;
• 8 eine vergrößerte Teilansicht einer vorgespannten Verbindungseinrichtung nach der Einbringung; und
• 9 eine vergrößerte Teilansicht einer vorgespannten Verbindungseinrichtung nach der Betätigung,

From the pictures shows:

• 1 an embodiment of a jet pipe arrangement according to the invention in a side view;
• 2 a section AA through a jet pipe arrangement according to 1 ;
• 3 a three-dimensional view of the section AA through a jet pipe arrangement according to 1 ;
• 4th a plan view of a connecting device with a spring element;
• 5 a section BB through a connecting device according to 4th ;
• 6th a three-dimensional view of the connecting device according to FIG 4th ;
• 7th a three-dimensional view of the connecting device according to FIG 4th with cut spring element and cut preload element;
• 8th an enlarged partial view of a pretensioned connecting device after insertion; and
• 9 an enlarged partial view of a pretensioned connecting device after actuation,

1 shows an example of an embodiment of a jet pipe arrangement 10 according to the invention in a side view. The jet pipe arrangement 10 consists essentially of a ceramic radiant tube 11 , a metallic nozzle flange 20th , a tension ring 30th and several connecting devices via which the jet pipe 11 sealing and resilient with the nozzle flange 20th connected is. Two connecting devices with the reference numbers are exemplary 40 and 41 marked.

2 shows the section AA through a jet pipe arrangement according to 1 , while 3 shows a three-dimensional view of this section AA. It can be seen that the ceramic jet pipe 11 at the end a thickening in the form of a clamping ring 12th having, for example, was siliconized. This clamp ring 12th stands radially outward from the jet pipe 11 from time to time it is used to connect to the nozzle flange 20th . The jet pipe 11 is therefore so far in the nozzle flange 20th introduced that the clamping ring 12th at least partially in the area of the nozzle flange 20th is located. The nozzle flange 20th has several flange holes 21st , 22nd , 23 on which the lance flange 20th can be screwed to a furnace flange (not shown). Between the nozzle flange 20th and a seal is introduced into the furnace flange.

The clamping ring 12th is about two seals 70 and 71 between the nozzle flange 20th and the tension ring 30th clamped. The nozzle flange 20th has an inner circumferential pocket or groove 24 on that by two plate rings 25th and 26th is formed, which is radially in the direction of the jet pipe 11 stick out. The clamping ring 12th is supported by a seal 70 on a lower plate, which can therefore also be called a sealing plate or support plate. This sealing plate 25th is slightly longer than a clamping plate in the radial direction 26th . The clamping plate 26th serves to clamp a connecting device 40 , 41 over the tension ring 30th . This is done over the inner circumference of the clamping plate 26th distributed several flange mountings in the form of radially extending slots 27 intended. At the corresponding positions of the clamping ring 30th there are clamping ring mountings 31 in the form of holes. The connecting devices 40 , 41 exhibit spring elements 50 and 51 and are each through the flange mounts 27 and the clamping ring mounts 31 guided and above the clamping ring 30th by nuts 60 , 61 tense. Between the clamping ring 30th and the clamping plate 26th there is a gap, the clamping ring 12th in the axial direction over the clamping plate 26th and thus the lance flange 20th protrudes.

The structure of these connecting devices 40 , 41 and their function is explained in more detail with reference to the following figures. 4th shows a plan view of a connecting device 40 with a spring element 50 , while 5 a section BB through the connecting device 40 shows. 6th shows a three-dimensional view of the connecting device 40 and 7th a three-dimensional view with a cut spring element 50 and cut biasing element 81 .

The spring element 50 is made up of several disc springs using a spring package 52 educated. Through the spring package 50 is a screw 80 guided and in the axial direction in a threaded hole 83 in a bolt 81 screwed in. This bolt is used as a preload element and in the following as a preload bolt 81 designated. The preload bolt 81 is end with an external thread 82 provided, the cross section of the preload bolt 81 tapered over at least one shoulder and the external thread 82 at the thinner end of the preload bolt 81 is provided. The thicker end of the preload bolt 81 serves as a stop for the spring package 50 if it is by screwing in the screw 80 in the preload bolt 81 is biased.

The disc springs 52 of the spring package 50 are cut straight on opposite sides so that parallel cut surfaces 53 and 54 surrender. When installing a connecting device 40 into the jet pipe arrangement 10 becomes the spring package 50 so in the pocket 24 introduced that a cut surface to the jet pipe 11 is directed towards. The preload bolt 81 also has parallel, opposite cut surfaces 84 and 85 on. The distance between these two gate faces 84 , 85 is so to the width of a slot-shaped flange mount 27 matched that the preload bolt 81 with this area secure against rotation in the slot 27 can be included.

The spring package 50 is made by screwing in the screw 80 in the preload bolt 81 biased to a desired dimension. In this pretensioned state, the connecting device 40 in the jet pipe arrangement 10 built-in. The 8th and 9 show two installation phases. 8th shows an enlarged partial view of a pretensioned connecting device after introduction, and 9 an enlarged partial view of a pretensioned connecting device after actuation, ie after tightening a nut. The view corresponds to the 9 the section AA while 8th a section through a connecting device 40 represents under a radially outward view. The 8th is next to the sealing plate 25th also the recording 27 in the clamping plate 26th of the nozzle flange. Furthermore, the recording 31 in the clamping ring 30th refer to. The spring package 50 is pretensioned and the connecting device was initially in this condition in the receptacle 27 brought in. This was preferably done so as to be non-rotatable. In this way all connection devices 40 , 41 in the surrounding pocket 24 to be placed. Then the jet pipe 11 inserted into the jet pipe flange and the clamping ring 30th via the nozzle 11 set. The tension ring 30th is put on by the preloading bolts of each connecting device through a respective hole 31 in the clamping ring 30th be guided. The seal between the clamping ring 12th and the other components are carried out as described.

The spring package is in this state 50 still at a distance from the inside of the clamping plate 26th . The head of the screw 80 can on the sealing plate 25th the pocket 24 rest. The external thread 82 of the preload bolt 81 protrudes above the clamping ring 30th from the recording 31 so that a nut on the external thread 82 can be screwed on. On each above the tension ring 30th protruding external thread of a respective preload bolt 81 a nut is screwed on and tightened. As a result, the respective connecting device moves with its spring assembly 50 towards the clamping plate 26th . Once the spring package 50 Contact with the clamping plate 26th and the associated nut is tightened further, the spring assembly is tightened further, preferably until shortly before a blockage. 9 shows this attracted state with a spring package 50 coming from the direction of the pocket 24 on the clamping plate 26th is applied.

The ceramic jet pipe is in this state 11 compared to the metallic nozzle flange 20th sealed. If there is also a tight connection to the nozzle flange 20th The radiant tube is connected to a furnace flange, which in turn is tightly connected to a furnace wall 11 close to furnace wall. Different expansions of the ceramic and metallic components at high temperatures are compensated for by the spring action of the connecting elements, so that there is no gap between the clamping ring 12th and the tension ring 30th as well as between clamping ring 30th and the sealing plate 25th arises that is not safe through the seals 70 and 71 would be sealed.

List of reference symbols

10

Jet pipe arrangement

11

Jet pipe

12

Clamping ring

20th

Nozzle flange

21,22,23

Flange hole

24

Pocket, groove

25th

Sealing plate

26th

Clamping plate

27

Flange mount, slot

30th

Clamping element, clamping ring

31

Clamping ring holder, bore

40.41

Connecting device

50.51

Spring element, spring package

52

Disc spring

53.54

Cutting area spring package

60.61

mother

70.71

poetry

80

screw

81

Preload element, preload bolt

82

External thread

83

Threaded hole

84.85

Cut surface of preload element

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102014110607 A1 [0005]
• DE 102008048972 A1 [0006]
• DE 19808405 A1 [0007]

Claims (14)

Radiant tube arrangement (10) for a furnace, comprising - a ceramic radiant tube (11) which is provided at the end with a radially outwardly protruding, circumferential clamping ring (12), - a radiant tube flange (20), - at least one clamping element (30), and - Several connecting devices (40; 41), each having a spring element (50; 51), the clamping ring (12) being clamped resiliently between the at least one clamping element (30) and the jet pipe flange (20) by means of the several connecting devices (40; 41) and a seal (70) is arranged at least between the clamping ring (12) and the jet pipe flange (20), characterized in that the connecting devices (40; 41) each have means for installing in the jet pipe arrangement (10) with a spring element (50 ; 51) in a pretensioned state and have means for actuation, by which the connecting devices (40; 41) by means of their spring elements (50; 51) resiliently clamp the clamping ring (12) between Chen cause the at least one clamping element (30) and the jet pipe flange (20). Jet pipe arrangement according to Claim 1 , wherein the clamping element is a clamping ring (30) through which the jet pipe (11) is guided coaxially. Jet pipe arrangement according to Claim 1 or 2 , wherein the connecting devices (40; 41) are arranged in a circle around the jet pipe (11). Jet pipe arrangement according to one of the Claims 1 to 3 , wherein the spring elements (50; 51) of the connecting devices (40; 41) are arranged in a pocket which is designed to be open towards the jet pipe (11), and the pocket is formed at least by a clamping plate (26) and a sealing plate (25) which run radially and are axially spaced from one another, the spring assemblies (50; 51) being supported on the clamping plate (26) of a pocket when the connecting devices (40; 41) are actuated. Jet pipe arrangement according to Claim 4 , the clamping ring (12) being supported on the sealing plate (26) of a pocket via a first seal (70). Jet pipe arrangement according to Claim 4 or 5 wherein the pocket is a pocket (24) which runs around the inside of the jet pipe flange (20) and in which the spring elements (50; 51) of the connecting devices (40; 41) are arranged. Jet pipe arrangement according to one of the Claims 1 to 6th wherein the connecting devices (40; 41) each have a prestressing element (81), against which their spring element (50; 51) can be prestressed, in particular with a screw (80). Jet pipe arrangement according to Claim 7 , wherein the screw (80) is guided through the spring element (50; 51) and screwed into the pretensioning element (81). Jet pipe arrangement according to one or more of the Claims 1 to 8th , wherein a spring element (50; 51) is formed in each case by a spring assembly of a plurality of plate springs (52). Jet pipe arrangement according to Claim 9 , the spring assembly (50; 51) being cut on at least one side facing the jet pipe (11). Jet pipe arrangement according to one of the Claims 1 to 10 , the connecting devices (40; 41) each being guided through a receptacle (27) in the jet pipe flange (20) and a receptacle (31) in the clamping element (30). Jet pipe arrangement according to Claim 11 , wherein at least the receptacle (27) in the jet pipe flange (20) is a radially extending indentation. Jet pipe arrangement according to one or more of the Claims 1 to 12th wherein the connecting devices (40; 41) are each secured against twisting with respect to the jet pipe flange (20) and / or the tensioning element (30). Method for assembling a jet pipe arrangement with the provision of a jet pipe (11), a jet pipe flange (20), at least one tensioning element (30) and several connecting devices (40; 41) with respective spring elements (50; 51) according to one or more of the Claims 1 to 13 , comprising at least the following steps: - pretensioning of a spring element (50; 51) in each case in the plurality of connecting devices (40; 41) and subsequent introduction of the connecting devices (40; 41) in intended positions relative to the jet pipe flange (20), Clamping element (30) in an intended position opposite the jet pipe (11) and the jet pipe flange (20), - introduction of a first seal (70) between the clamping ring (12) of the jet pipe (11) and the jet pipe flange (20), - introduction of the Jet pipe (11) in a provided position opposite the jet pipe flange (20), - introduction of a second seal (71) between the clamping ring (12) of the jet pipe (11) and the at least one tensioning element (30), and - actuation of the connecting devices (40) ; 41), whereby the clamping ring (12) of the jet pipe (11) is resilient and sealing between the at least one Clamping element (30) and the jet pipe flange (20) is clamped.

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