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(11) Patent Number: KEY 28
(45) Date of grant: 25/03/1997
(12) PATENT
 (51) Int.C1.7: F 16L 23/00, 23/032
(21) Application Number: 1996/000173
(22) Filing Date: 25/01/1996
(30) Priority date: 9500839 25/01/1995 FR
 
(73) Owner:LEVIVIER GUY of , 96 ROUTE NATIONALE -59300 AULNOY LES VALENCIENNES FRANCE, France and LEVIVIER YVES of , 6 RUE DAVID DESVACIIEZ 59300 VALENCIENNES FRANCE, France
(72) Inventor:LEVIVIER GUY and LEVIVIER YVES
 
(30) Priority data:    (74) Agent/address for correspondence:9500839 25/01/1995 FR    Hamilton Harrison & Mathews, P.o.Box 30333 Nairobi ICEA
Building, Kenyatta Avenue
(54) Title:FLANGE FOR COMPENSATOR COUPLING OR PIPES
(57) Abstract:
The invention relates to a flange for compensator couplings or pipes , consisting of a circular ring provided with apertures for the assembly bolts
Flanges are essential components for assembly of pipes in industrial piping. This assembly consists of connecting the flanges in pairs to the ends of the pipes , and compressing a gasket between the flanges. This assembly is obtained by means of bolts which pas through the apertures of the flanges.
 
According to a variant, the flange 3 is disposed behind a turned-up collar 4', provided directly at the end of the pipe 1 or welded to the latter.
The flanges 2, 3 are provided with apertures 5 for passage of bolts, not shown.
There are also cases where two pipes 1, 10, which are provided at their corresponding ends with a flange 2, 12, are assembled by means of a compensator coupling 11 (Figure 3). The actual coupling 17 consists of a multi-layer metal carcass with reinforcement of the flat sealing bead 15, provided with an inner lining 16 and an outer lining 17, the linings being made of rubber or a plastics material which is resistant to the fluid which flows in the pipes. At the ends, there are two mating flanges 18, which are factory mounted on the coupling 11.
The coupling 11 is attached to the flanges 12, 13 of the pipes by means of mating flanges 18, and at the same time the edges 19 of the coupling 11 constitute the gasket. Assembly is by means of the bolts 22.
 
These compensator couplings permit absorbtion of faults of alignment (parallax or inclination) or expansion of the pipes 1, 10, or hammer blows. They prevent or reduce transmission of vibrations.
The flanges or mating flanges, in particular those of compensator couplings, are currently made by machining of flame-cut parts, by forging, or from grey cast iron. However this last solution is only suitable for flanges which are not destined to be welded, since cast iron is involved. These cast iron flanges also have the disadvantage that they are heavy and fragile.
The actual flanges are welded to the pipes, whereas the mating flanges are fitted on the end of the pipes. The flanges of the compensator couplings .are factory-mounted on the resilient couplings, and are supplied assembled to the user.
The weight of the flanges is an important factor, since the price of a flange depends directly on the weight, as all the operations carried out on the flanges (surface treatment, transport, etc.) are invoiced by weight.
 
The precision of the flanges currently manufactured is often unsatisfactory, since for reasons of labour cost, the flanges are mainly Manufactured in countries with a low labour cost, on poorly developed machines; the dimensions of all the parts have to be checked, and if necessary adjustments must be made by machining.
This work is lengthy and costly. There are also the problems of long supply periods, and high stock control cost.
In greater detail, there are a given number of documents which describe flanges.
For example document US-A-2 528 343 describes a flanges which is provided with trapezoidal openings distributed in a fan-shape, in order to permit absorbtion of slight faults of correspondence of the openings of the other flange.
Another document US-A-4 372 587 describes a flange in two halves which ends on both sides in lugs. The two halves are connected by bolts which pass through the two lugs, in order to clamp and fasten this flange by its teeth against the pipe.
 
After this assembly, the flange is connected to the flange of the other pipe.
This flange in two parts relates to a very specific requirement i.e. that of fastening to the end of the pipe by means of a relatively large fastening surface, by local increase of the thickness of the flange relative to a conventional flange.
To summarize, there are different shapes of flanges, but in no case does the prior art refer to transmission of forces in a flange, associated with weight reduction of the latter.
The object of the present invention is to create flanges and mating flanges, the weight of which is reduced relative to existing flanges and mating flanges, such as to be able to use more efficient manufacturing techniques without increasing the final costs, and even with a decrease of the latter, and to facilitate the Operations of transport, storage, packaging and use.
For this purpose, the invention relates to a flange of the above-described type, Characterised in that it comprises:
-    an inner ring;
-    an outer ring which is connected to the inner ring by arms which are provided with apertures for the passage of the assembly bolts.
The new structure of the flange and mating flange according to the invention permits excellent distribution of the clamping forces between the inner ring and the outer ring, with a substantial saving of material, and consequently a considerable reduction of weight. This reduction, which is 50-651, makes it possible to envisage for production techniques which are currently prohibitive owing to the cost (associated with the weight).
According to a particularly advantageous feature, the flange according to the invention IS made in particular by casting in SC (spheroidal graphite) cast iron, cast steel, or cast
aluminium. This manufacturing technique is compatible from the point of view of cost with conventional manufacture, precisely owing to the reduction of weight of the flange. However this casting technique provides the advantage of excellent accuracy of manufacture, which permits elimination of lengthy and costly checking operations.
 
This manufacturing technique also reduces the proportion of the cost of labour in the price of the product as a whole, which permits manufacture of flanges of these types in countries with a high labour cost, whilst obtaining a competitive product. This makes it possible to eliminate from manufacture a given number of very serious disadvantages such as stock control, by reducing stock by almost half, and by preventing problems of more or less random supply concerning delivery periods, and prices of products obtained from countries with a low labour cost.
The reduction of the weight of the flanges permits substantial savings in the operations of protection (galvanisation, .
chromating etc.), as well as in those of packaging. and transport. The considerable reduction of
weight allows a larger number of parts to be packed on a single pallet; this reduces considerably the cost of the packaging (pallet, plastic cover) in the price of each part.
Finally, the reduction of the weight permits a considerable saving in use in all industries, for example in the Navy, by reducing the dead weight of equipment transport or loads withstood by the infrastructures (refineries, chemical installations etc.).
According to other advantageous features:
-    the arms have reduced thickness relative to at least one of the rings;
-    the apertures are oblong;
-    the arms have a contour in the form of an arc of a circle centred on the apertures;
-    the arms have a straight contour which faces radially the centre of the flange;
- the inner ring has on one surface a collar whichforms a double recess which delimits a groove;
-    the inner ring contains a groove;
- the flange centainereinfortements which connect the inner ring to the outer ring in the interval of the army provided with apertures for passage of the bolts;
-    the flange consists of SG cast iron, cast aluminium, or cast steel (carbon steel, stainless steel) and;
-    the inner ring is extended by a deformation in the form of a cap, in order to constitute a blind flange.
The present invention is described hereafter in greater detail by means of the attached drawings in which:
 
- Figure 1 is an axial cross-section of a pipe provided with a flange and a mating flange with a flat collar/
- Figure 2 is an axial cross-section of a pipe provided with a flange and a mating flange with a turned-up collar/
-    Figure 3 is an schematic axial Cr0155 - section of the assembly of two pipes with a compensator coupling interposed;
- Figure 4 is a partial front view of a Mating flange for a resilient coupling, showing on its upper half a single recess, and on its lower part a double coupling-type recess;
-    Figure 5 is a cross-section according to V -V of the flange in Figure 4;
- Figure 6 is a half front view of a flange variant;
- Figure 7 is a front view of a mating flange for a coupling, reinforced with a single female recess;
- Figure 8 is a front view of a flange to be welded;
- Figure 9 is a front view of a flange to be welded with reinforcements;
-    Figure 10 Is a front view of half a flange with a single female recess;
- Figure 11 is a cross-section according to XI-XI in Figure 10;
-    Figure 12 is a front view of half a flange with a single female recess according to another, embodiment;
-    Figure 13 is a cross-section according to XIII-XITI in Figure 12;
-    Figure 14 is a cross-section similar to that in Figure 13 on an enlarged scale, showing a variant embodiment of Figures 12 and 13;
-    Figure 15 is a front view of a blind flange according to the invention;
-    Figure 16 is a cross-section according to XVI-XVI in Figure 15; and
- - Figure 17 is a cross-section according to XVII-XVII in Figure 15.
Figure 4 shows on its upper part half a flange 20 consisting of an inner ring 21 connected to an outer ring 22 by arms 23, which, themselves are provided with apertures 24 for the assembly bolts.
In this example, there are four arms 23 distributed egulangularly. The number of bolt apertures Is standardized according to the application of the ‘flange (pipe diameter, operating pressure etc).
 
The interval 25 between the inner ring 21, the outer ring 22 and the arms corresponds to openings.
According to the embodiment in Figure 1, the shape of the arms 23 is in the form of an arc of a circle centred on each aperture 24. The inner ring 21 has a female recess 26, which opens onto the front surface of the flange and its passage 27.
On the other side, the passage 27 is edged by a shoulder 28.
The lower part of Figure 4 shows a flange variant 20' of which only the inner ring 21' is modified compared with that 21 of the flange 20. This inner ring 21' forms on one surface a double female recess by means of its collar 21'A, delimiting a groove 21'13.
The parts of this flange 20' which are identical to those of the flange 20 have the same references, and their description is not repeated.
The shape of the recesses of the flanges 20, 20' corresponds to that of the flanges in Figure 3.
 
Figure 6 shows a variant 20" of the flange 20 in Figure 4. It is distinguished in the shape of the arms 23', which are delimited by contours which face substantially radially. The other parts of this flange 20", which are identical to those of Figure 4, have the same references and their description is not repeated.
Figure 7 shows a variant flange 'consisting of an inner ring 31, an outer ring 32 Connected by arms 33 through which there pass apertures 34 destined for the assembly bolts, and by reinforcement arms 39 which form openings 35 with the arms 33 and rings 31, 32.
As previously, this flange 30 has for example a single female.recess 36 for the coupling (not shown).
The flange 40 in Figure 0 is similar to that in Figure 4 in the shape of the outer ring 42 and the arms 43 which are provided with apertures 44 and form openings 45. The inner ring 41 differs in that it does not contain a recess, this flange being destined to.form d. flange to be welded or a mating flange for, a pipe suoh as those in Figures 1 and 2.
 
The flange 50 in Figure 9 is a lapped flange or mating flange such as those in Figures 1 and 2. It has reinforcements 59 between the inner ring 51 and the outer ring 52, in addition to the arms 53 provided with apertures 54, the arms 53 and reinforcements 59,
In this case the inner ring 51 contains a shoulder 51A.
The flange 60 in Figures 10, 11 is characterised by reduced thickness of the outer ring 62 and the arms 63 relative to the inner ring 61,'which is extended on one surface by a collar 618, and on the other contains a recess 61A. In this example the apertures are oblong and are designated 64, and the openings between the ring 61, 62 and tha area 63 are designated 65.
The oblong shape of the apertures permits an even greater reduction of the weight of the flange, representing a saving in weight of approximately 10%.
The flange 70 in Figures 12, 13 also has a single female recess.
 
This flange 70 is distinguished from the previous flanges by reduction of thickness of the arms 73 which connect the inner collar 71 to the outer collar 72. The arms 73 contain oblong apertures 74, and the inner collar 71 has a recess 71A.
The flange variant 80 consisting of the final cross-section in Figure 14 substantially corresponds to the form of the flange represented in Figuree 12, 134 a double female recess counter¬shaft is provided with oblong apertures 84 in its reduced thickness arms 83. On one of the surfaces, a collar 81A delimits a peripheral groove ala in the inner ring 81, in order to form the double female recess.
Figures 15, 16, 17 are a variant of the flange 90 according to the invention, in the form of a blind flange, for example in order to close a duct.
This flange 90 has an inner collar 91, an outer collar 92 and arms 93 which are provided with apertures 94.
The inner flange 91 is extended by a deformation 95 in particular in the form of a cap which closes rne centre of the flange 90. The deformation leaves substantial parts 96, 97 clear on both sides.
Figures 15, 16 show the reduced thicknesa of the arms 93 between the outer ring 92 and the inner ring 91.
The cross-section in Figure 17 also emphasises the shape of an arm 93, its thickness, and that of the outer ring 92.
The flanges, mating flanges and blind flanges according to the invention are advantageously manufactured from cast steel, SG (spheroidal graphite) cast iron, or cast aluminium, or by forging and Cutting.
AS an example, a current mating flange of type PN16 DN65 (nominal pressure 16 bars, nominal diameter 65 mm) for a resilient or compensator coupling, weighs 2.6 kg (machined) and 2 kg (forged) whereas a mating flange of the same type according to the invention made of SG Cast iron weighs only 0.90 kg, and 0.34 kg when made of cast aluminium.
Additionally, manufacture from SG cast iron permits outputs of 200 to 250 parts per hour on a specific type of installation, compared with 30 to 50 by machining.
As already stated, in addition to the substantial saving in weight and increase in output, the manufactured parts have excellent precision; this eliminates part-by-part checks and re-machining time. Since the parts are lighter, the price of packaging and transport is reduced correspondingly. The very substantial reduction of the manufacturing cost permits on-the-spot manufacture, with which imports from low wage countries cannot compete, thus eliminating problems of management, stock, delivery periods, re-supply And random prices. The flanges and mating flanges according to the invention can be manufactured in all dimensions and applications, as free flanges, flanges to be welded and mating flanges.
 





CLAIMS
1)    Flange for compensator couplings or pipes consisting of a circular ring provided with round or oblong apertures (64) for the assembly bolts, characterised in that it comprises: - an inner ring (21);
- an outer ring (22) which is connected to the inner ring (21) by arms (23) which are provided with apertures (24) for the passage of the assembly bolts.
2)    Flange according to Claim 1, characterised in that the arms (73) have a reduced thickness relative tout least one of the rings (71, 72).
3)    Flange according to Claim 1, characterised in that the apertures (64, 74, 84) are oblong.
4)    Flange according to Claim 1, characterised in that the arms (23) have a contour in the shape of an arc of a circle centred on the apertures (24).
5)    Flange according to Claim 1, characterised in that the arms (23') have a straight contour facing radially towards the centre of the flange.
6)    Flange according to Claim 1, characterised in that the inner ring (21') has on one surface a collar (21•A) forming a double recess which delimits a groove (21,11).
7)    Flange according to Claim 1, characterised in that the inner ring (61, 71) has a recess (61A, 71A).
8)    Flange according to Claim 1, characterised in that it has reinforcements (39, 59) which connect the inner ring (31, 5]) to the Otter ring (32, 52) in the interval of the arms. (33, 53) which are provided with apertures (34, 54) for passage of the bolts.
9)    Flange according to Claim 1, Characterised in that the inner ring (91) is extended by a deformation (95) in particular in the form of a cap, in order to constitute a blind flange (90).
10)    Flange according to Claim 1, characterised in that it consists of SG cast iron or cast aluminium, or cast steel (Carbon steel, stainless steel).

                                                ABSTRACT
                       "Flange for compensator coupling Or pipes"
                                         Yves LEVIVIER
                                         Guy LEVIVIER
a)    Flange for compensator coupling or pipes.
b)    Flange characterised in that it comprises:
-    an inner ring (21);
-    an outer ring (22) which is connected to the inner ring (21) by arms (23) which are provided with round apertures (24) and oblong apertures (64) for the passage of the assembly bolts.
Figure 4 attached

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