WO2017100880A1 - Two-part counter flange for ductile iron pipes and multi-part counter flange for ductile iron pipes - Google Patents

Abstract

In its preferred embodiment, the present two-part counter flange illustrated in figures 6 to 9 is highly simple, comprising two identical semicircular parts (6a, 6b) with contacting and fastening tabs (10) and holes (11) for the insertion and fastening of screws and nuts, the present two-part counter flange (6a, 6b), two screws (7a, 7b) for each hole, four washers (8), and fastening nuts (9) for the corresponding screws, wherein said parts (6a, 6b) are joined using the set of screws, washers and nuts, resulting in a mounted two-part counter flange assembly (6) in engagement via the fastening tabs (10) with an end side (11) and a socket side (12).

Description

AGAINST FLA GE BIPARTITE FOR DUCTILE IRON PIPES, AND AGAINST.FLANGE POLI DUPTILE IRON PIPES PART OF THE INVENTION

[0001] The present invention relates to a split split flange assembly for external locking joint, more specifically a split split flange.

 [0002] The embodiment of the present invention allows for the manufacture in ductile cast iron of again against split flange, which promotes substantial improvement in the ductile iron pipe connection systems.

 Background of the Invention

[00.03] All piping shall be arranged in such a way as to allow repairs and maintenance of special parts and connections with a minimum of system disturbance, especially without causing tensions on other parts.

Apparent joints shall be primarily made of cast-iron (rigid joints) and -com. expansion and easy disassembly joints (gibault joints, for example): as these pipes are subject to accidental weather, vibration and shock in everyday operation.

[0005] Joints with. The flanges consist of two flanges between which a special washer, which is compressed by the tightening of bolts with nuts, is provided to ensure tightness. [0006] ^· Trata-.se rigid joint that allows disassembly of the pipe.

Widely used in industrial installations, in discharge pipes, in abstractions and inlets, in. These joints, among others, have as their main advantage the relatively easy and precise assembly, the hassle-free disassembly for repairs and maintenance, and the elimination of anchorages in view of the solidarity of the pipes with the connections.

Ductile cast iron pipes can reach up to 6.8 meters in length, and have a nominal diameter (DN) of 50 to 1200, withstanding maximum pressure from 1 Mpa to 2.5 Mpa (without overpressure).

In existing joints, the external locking joint flanges mounted on a pocket connection have a large amount of screws for treatment to prevent axial displacement.

[00010] These bolts are determined according to the nominal diameter (DN) of the pipe or connection compatible with the counter-flange.

Table 1 below shows the huge amount of bolts currently used for fastening / locking, in cylindrical design, in back flange mode, according to the indicated DN, for Allowable Working Pressure in all modalities. of 2.5 Megapascal. W

 3

Table 1

 In smaller diameters, as was nominal diameter of 50, amount of screws will never be less than four.

Figures 2, 3 and 4 show an example of the prior art, illustrating an external locking counter-flange that holds eight screws (Figure 2) in a suitable view to highlight the eight screw placement and attachment points, the Figure 3 is a cross-sectional view of the object described in Figure 2, and Figure 4 is a cross-sectional view showing the ductile iron circular counter-flange (1) fixed by a ductile iron lock joint bolt (2) and corresponding lock joint nut in ductile iron (3) as well. such as the connected elements (pipe sections), at their point of connection and flange installation, such as: the pipe bag or fitting (4) and the pipe tip or fitting (5)

As an example of the prior art, document BR1Q20130240001 of 11.17.2015, which highlights a set of flanges and clamp for a mineral pipe joining and sealing system where, in the pipe joining (b), a flange (1) remains partially exposed to receive the female flange (7) by recoiling it (8), guiding it a until its stop (9) abuts the partially exposed sealing ring (6) of the male flange (1), parallel aligning the couplings (2), coupled, to receive clamp (12) in its (19) and locked by bolt (17) and clamping nut (18) (Summary).

 Said configuration does not anticipate the present invention because it is a non-modular element.

Description of the Invention

 [00016] The present invention provides a split flange, composed of two semicircular pieces, fixed using only two bolts and nuts, regardless of the pipe diameter that will accommodate the split flange of the present invention.

 The counterflange configuration of the present invention has been thought to decrease the installation time and uninstallation of the assembly as well as reducing the final weight of the assembly.

 From the predefined model were: technical studies of thickness reduction, load simulations to verify the mechanical behavior using

INVENTOR software, with the Finite Element methodology, the tests Types prescribed in BR 7675 to qualify the system and change in manufacturing methods.

The simulation performed using the Inventor software (Figure 8A) allows to visualize the mechanical and structural behavior of the material, portraying with. fidelity the practical results of the final product application - against flange

split,

Description of the Figures

As already described, figures 2 and 3 show an example of the prior art, illustrating an external locking joint counterflange that holds eight bolts (Figure 2) in a suitable view to highlight the eight screw placement and securing points, Figure 3 being a cross-sectional view of the object described in Figure 2, Figure 3 being a cross-sectional view showing the ductile iron circular counter-flange (1) fixed by a ductile iron locked joint bolt (2) and corresponding lock nut. ductile iron locked gasket (3), as well as the connected elements (pipe sections), at their point of connection and installation of the flange, namely, the pipe bag or fitting (4) and the pipe tip or fitting ( 5)

 Figures 1A and 1B illustrate the preparation of two pipe section ends to receive the counter flange of the present invention.

[00022] Figure 4 shows the split split flange of the present invention, identifying the two parts thereof (6a) and (6b).

 Figures 5, 6, 7 and 12 show the application of the split flange of the present invention in a connection situation, showing two pipe ends, with one end side (11), one side of the pocket (12). and the installed split flange (6a, 6b).

 [00024] Figure 8A represents a simulation performed using Inventor software;

 [00025] Figure 83 is an illustration of possible deflection.

 Figures 9 and 98 show a schematic view of the split flange of the present invention (6a, 6b), two bolts for each hole (7a, 7b), four washers (8) and lock nuts (9) for the matching screws.

Figures 10 and 11 illustrate a cross-sectional view of the split flange of the present invention showing the fastening and contact tabs (10) and the holes for insertion and fastening of bolts and nuts (11), as well as the counterflange body. of the present invention (12).

 Figure 13 is a top and cross-sectional view of the split flange of the present invention installed, showing the guide element (17) formed in the preparation phase of the duct segments;

Figure 14 shows the elements 1, 2 and 3 of the piece. installed.

 -033-03 Figure 15 A is an exploded perspective view of the countershaft to be installed in a two-segment joint. with the guide element (17) already installed.

Figure 15 B shows the wedge element 18;

Figures 15 C and 15 D represent the continuation of the installation process represented by Figure 15 A.

Figure 16 ^" illustrates an alternative embodiment of the present invention, more specifically a counter-flange.

polypartite, suitable for larger pipes, from 400 mm;

[00034] Figures 17a, 17b and 18 are illustrations of a

embodiment of the present invention.

 Description of Preferred Mode

In its preferred embodiment, the bipartite counter-flange of the present invention, illustrated by Figures 6 to 9, is substantially simple, comprising two identical semicircular parts (6a, 6b.) With attachment and contact tabs (10) and holes for inserting and securing bolts and nuts (11), the split flange of the present invention (6a, 6b), two bolts for each hole (7a, 7b), four washers (8) and securing nuts (.9) for the matching screws.

[00036] The aforementioned parts (6a, 6.b) are joined together by bolts, washers and nuts, resulting in a set of contracting ^'installed split flange (6) in engagement through the securing tabs (10} stain one end side (11) and one side of the pouch (12).

 This is evident from a new and innovative technical effect, embodied in a differentiated set of parts, acting in synergy, with evident saving of parts, time and maintenance in installation, without any loss of handle quality, fixation and insulation.

 Operation

 Prior to the operation of the invention, we have a union between the tube pocket (11) or fitting, provided with locking collar (15), and the tip of the pipe (13) or fitting. Both made of spheroidal graphite cast iron.

 Locking begins with the application of the weld bead (14) to the tip (13), which has the function of preventing the tube from slipping or connecting by the locking ring (16). The bead weld together with ring. lock is the lock point of the tip. By the bag we have as lock point the locking collar solidarity the bag.

 In order for this joint between tip and pouch, and their respective locking points, to be blocked before its opening caused by internal pressure, the mounting of the counter flange, according to the present invention, is necessary.

The flange, preferably made of spheroidal graphite cast iron, connects the locking points of the pouch and the tip. Existing in one of the ends of the. counter-flange, contact between bag collar and counter-flange locks. At the other end, the contact occurs between the locking ring and the spherical surface of the counter flange. The latter contact with a specific feature allows deflection of the pipe or connection without disengaging from the joint.

[ ^Q Q042] In order to make the mounting and dismounting of the counter flange possible, it has been designed in two parts (6a, 6b), having their union flaps (11) fixed by hexagon head bolts (: 7a, 7b) and respective washers (8) and nuts (9). The strength class of the bolts should be 8.8 or higher. The nuts must follow the strength class of the bolts.

The joining flaps between the counter flange parts have a cylindrical guide system (shoulder) (17) which limits the displacement between the parts ¹ .

 Installation

 [00044] K installation should be done by following these steps:

 - Tip preparation.

 Carefully grind a strip approximately 25mm wide in the area where the weld bead will be made. This work should not affect. the thickness of the tip.

 - Apply weld bead.

With the aid of a copper ring upstream of the position of the weld bead apply weld to obtain a uniform and orthogonal bead with the tip generator. The cord should be made in one pass only. The following tables show the dimensions and position of the weld bead:

[00047] At the end of the weld bead application, perform brushing and cleaning. The paint should be reconstituted in the affected region. Use in the first layer paint rich in. zinc-, for the second layer use asphalt based and / or epoxy bituminous paint. ^~ Position lock ring.

 Since the inside diameter of the locking ring is smaller than the outside diameter of the weld bead, it must be opened with a wedge (18) inserted into the discontinuity of the locking ring.

 - Mount tip and bag.

 Insert a rubber ring into the pocket of the bag by applying a radial effort until the ring fits into its housing.

 Apply layer of grease to the visible surface of the rubber ring and also to the end of the pipe or fitting.

 [00051] For effective pipe assembly, center the tip in the bag and keep the pipe resting on two wooden shims. I inserted the tip into the bag, noting alignment and leveling. The pocket mirror should be approximately 1 l from the weld bead,

 - Mount against flange.

 Fit the two halves of the counter flange as follows:

 [00053] Mounting screws, washers and nuts. For tightening, "socket" type wrenches should be used.

[00054] At first the clearance between the counter flange and the locking points of the tip and the pocket is normal. Only after line pressure is applied do the contacts between the parts 16000150

 12

treatment will be effectively carried out.

 Deflect, if necessary, within the permissible angle limit only after complete mounting of the counter flange.

[00056] By ^"an alternative embodiment the splitting of the counter flange, there is a possibility of dividing it into a greater number of setcres to facilitate manufacturing, handling and installation in larger diameter pipes but specifically. diameters greater than 400 mm.

At this point, it should be noted that the split flange can be applied to any pipe diameter, including the largest, the alternative embodiment now approached comprising another approach of the same inventive concept, and may be an option and / or certain designs.

Fundamentally the division into more than two sectors does not bring significant differences in the concept of the invention. The proposal remains for the replacement of the various prior art screws by latches integrated into the new flange.

Regarding the joint constituents there is no difference in the elements required for locking. Remaining the tip and pouch with pipe locking collar or fittings, the locking ring, the weld bead, the rubber ring and the counter flange remain necessary.

The installation also has no differences. All steps followed for mounting the split split flange should also be followed for mounting the option with more divisions.

However, split flanges for locking larger diameter pipes may be somewhat high for handling without the use of lifting machines. To improve this aspect, the invention, that is, the counter flange can be divided into more than two sectors, thus bringing less weight to each part. This weight reduction promotes a major improvement in handling, making it possible for operators to install in the field without the aid of lifting machines.

The choice of more divisions also brings benefits to counter flange manufacturing. Smaller and lighter parts are easier to process, suffer. minor dimensional changes and require simpler machinery for manufacturing.

Regarding the alternative embodiment, illustrated by Figures 16 to 18, we have:

Figures 17a and 17b show examples of divisions in more than two sectors. Figure 17a shows a counter-flange sectioned in four sectors; while figure 17b shows a counter flange sectioned in six sectors.

Figure (18) shows the components for mounting the counter flange. As can be seen, the use of the bolts (7), washers (8), nuts (9) and of course the counter flange (1) is maintained.

Notwithstanding the present invention illustrated in accordance with a presently preferred embodiment, it is understood that it is not limitative of the invention since changes and modifications will be readily apparent to those skilled in the light of the foregoing exposure. Accordingly, the invention should be limited solely by the scope of the following claims.

Claims

- CLAIMS - 1. BIPARTITED FLANGE FOR DUCK IR IRON PIPES, characterized in that it comprises two identical semicircular parts (6a, 6b) with clamping and contacting tabs (10) and flanges for inserting and clamping bolts and nuts (11), the flange - the split part of the present invention (6a, 6b), two screws for each hole (7a, 7b), four washers (8) and lock nuts (9) for the corresponding screws, said parts (6a, 6b) are joined through the set screws, washers and nuts, resulting in a split split countershaft assembly (6) engaging through the retaining tabs (10) with one end side (11) and one side of the pouch (12). 2. AGAINST. DOUBLE IR PIPE POLYPARTY FLANGE, characterized in that it comprises three or more identical semicircular parts (17a, 17b) with fixing and contacting tabs (10) and holes for inserting and fixing screws and nuts, the polypartite counter fiange of the present: invention, screws (7), washers (8), nuts (9) and of course the countersunk (1), said parts (6a, 6b) being joined through the set screws, washers and nuts, resulting in a. polypartile counterlange assembly installed on. snap through the locking tabs with one end side (li) and one side of the bag (12). A DIFFICULATED IRON PIPE FLANGE according to claim 2, characterized in that it comprises four identical semicircular pieces. 4. Polypartite flange for ductile iron pipes according to claim 2, characterized in that they comprise four identical semicircular pieces. AGAINST POLYPART FLANGE FOR DUCTILE IRON PIPES according to claim 2, characterized in that it is installed in 4G0mm pipes.