MX2014000780A - Method for the anti-corrosion protection of flanged couplings. - Google Patents

Abstract

The system is a method for protecting at least one vertical flanged coupling (5) or at least one horizontal flanged coupling (36) against external corrosion in surface installations, which can operate continuously with temperatures up to 80 DEG C, said method comprising the steps of: applying at least one anti-corrosion zinc tape (1, 2, 3) on at least one side face (4) and at least one front face (15) of at least one vertical flanged coupling (5) and at least one horizontal flanged coupling (36); and applying at least one transparent seal (20) against weather conditions and the penetration of external agents on at least one electroconductive adhesive (2) of at least one circular cut-out (9) in at least one special zinc part (7); and applying at least one microcrystalline petroleum wax (22) on at least one groove (19) and on at least one securing stud (41) and on at least one securing nut (10) of at least one vertical flanged coupling (5) and at least one horizontal flanged coupling (3 6); and applying a seal of high-density polyethylene (42) on at least one securing stud (41) and on at least one securing nut (10) of at least one vertical flanged coupling (5) and at least one horizontal flanged coupling (36). Figs. (1,2,4,6,7,8 and 10).

Description

ANTICORROSIVE PROTECTION METHOD FOR BRIDAL UNIONS FIELD OF THE INVENTION This invention corresponds in its essence to the field of chemical engineering, being galvanic protection and corrosion inhibition the most important materials, since the main processes of operation of the system have to do with the electrochemical mechanism of metals, in this case , zinc as sacrificial anode, carbon steel as cathode, and humidity of the environment as electrolyte. Both metals and the humidity of the environment interact in a very intimate way depending on their physicochemical properties to form a galvanic battery in which the free electrons of the zinc or anodic zone circulate through the metallic mass accumulating in the steel or cathodic zone. No less important is the additional mixture of other corrosion inhibiting components that together make up a very efficient system for the anticorrosive protection of the flanged joints.

OBJECT OF THE INVENTION The transportation of liquids or gases through underground pipelines or buried pipelines is much cheaper and much faster than transportation in storage tanks. The fact of being unmanned and fully automatic systems, makes them operate with lower operating costs and safer than motor transport, rail or maritime vessels and are not affected mainly by weather conditions.

Thanks to the impulse provided by the pumping stations, whose number and power are dependent on the volume to be transported, the viscosity of the product, the diameter of the pipe, the mechanical resistance and the geographical obstacles to be overcome, pipelines transport and distribute products more economically and in large quantities throughout the world.

The most used energetics in the world are crude oil, natural gas, liquefied petroleum gas (LP gas) and gasoline that are transported and distributed in pipelines through underground pipelines, which operate without interruption 24 hours a day , the 365 days of the year. Thanks to these transport systems it is possible to have access to these energy sources safely and economically. Given the importance of this means of transport, the use of flanged joints in the circuits of carbon steel pipes represents a very important part of this transport system.

Flanged carbon steel joints are mechanical elements used in the transportation systems of liquids or gases through pipe circuits. The advantage offered by the use of flanged joints lies in the fact that being joined by studs and nuts, allow a rapid assembly and disassembly of the elements that make up the piping circuits in order to make repairs or maintenance work. There are several types of flanged joints depending on their application and they are usually interconnected in the pipe circuits either threaded or welded.

For the reasons mentioned above, our objective is to contribute in the solution to solve the problems of corrosion in the flanged joints to reduce the costs of operation and maintenance and at the same time increase the safety conditions of the systems of transportation of overhead pipes.

BACKGROUND There are several products used for the protection of flanged joints in the market, some of them are: Belts or Bands Protectoresrasof stainless steel, Kleerband flange Protectors that are belts or strips of vinyl inhibitors of corrosion, Enviropeel System which is a thermoplastic corrosion inhibitor wrap, Petrolatum Tapes that are impregnated fabrics with saturated petroleum and inert siliceous fillers, Microcrystalline petroleum wax, Radolid Protection Caps that are high density polyethylene stoppers corrosion inhibitors for the external protection of nuts and fastening studs etc.

All the aforementioned products partially protect some components of the flanged joints, belong to different manufacturers and are used independently of each other, but there is currently no system or procedure that unites the different existing technologies and / or new technologies, which provide comprehensive and effective protection. The flanged joints need to protect against the action of corrosion the following basic components: The joints or seals of the flanged union, their internal faces, their front faces, their side faces, the studs and the clamping nuts.

BRIEF DESCRIPTION OF THE INVENTION This invention relates to a method for the integral anticorrosive protection of flanged joints operating at temperatures from -50 ° C to + 80 ° C in a continuous manner and which can be guaranteed for at least 30 years without corrosion problems. This system completely encapsulates the flanged joints since no interior or exterior surface is unprotected. To carry out this anticorrosive protection system, four basic materials need to be applied: 1. - A new technology that is an anticorrosive zinc tape designed to protect, storage tanks, pipes, and metallic structures, of carbon steel for superficial installations, which we propose ingeniously to protect the side faces and the outer front faces of the flanged joints. This zinc tape of high purity (99.90% zinc by weight) has a uniform thickness of 0.080 mm. It is provided with an electroconductive adhesive of acrylic type with a uniform thickness of 0.025 mm., Which can withstand temperatures from -50 ° C to + 130 ° C., And the temperature for its application is + 8 ° C to +40 ° C. The metallic surface must be cleaned before obtaining a degree of cleanliness to white metal.

The adhesive is called Electroconductive because it is provided with small particles of zinc of homogeneous size and shape, uniformly dispersed over the acrylic base, these particles ensure an electrical conductivity to the adhesive and a metallic continuity between zinc and steel, in such a way that If this coating is damaged in some place, an electrolyte will be filtered through the atmosphere in the damaged place, then, between the metal surfaces, a galvanic battery will be verified, in which the zinc will assume the anode function, dissolving and protecting the metal surface or cathode of the pile (Fe) (Galvanice protection by cold rolling).

For the protection of the side faces of the flanged joints, special zinc pieces are cut in the form of small isosceles trapezoids with a circular cut in the center of each piece according to the size of each flanged joint. Each special piece of zinc is removed its release paper just before putting it in contact with the metal surface and through the circular cuts, they are placed in each and every one of the clamping nuts, until all the pieces as a whole form an absolute protection on both sides laterals of the flanged union. Each of these pieces are assembled with a minimum overlap of 1 cm between each of them and are secured to the metal surface by a wooden spatula.

For the protection of the frontal faces of the flanged joints, rectangular pieces of zinc are cut according to the width of each flanged connection by 30 cm. of length, each piece is removed its release paper just before putting it in contact with the metal surface and applied by aligning it to the front faces of the flanged union, ensuring its adhesion with a wooden spatula. For vertical flanged joints, these rectangular zinc pieces must always be applied from the bottom of the flanged joint to the top with a minimum overlap of 1.5 cm on each side, and the necessary number of pieces must be applied to cover the entire perimeter. the flanged union. Finally, with the help of a cutter, a cut of approximately 1.5 x 1.5 cm is made in the groove of the flanged union to carry out later, the inner protection of the same. Metal surfaces must be cleaned beforehand to obtain a degree of cleanliness to white metal. 2. - A transparent seal against temperature and the penetration of external agents into the Electroconductive adhesive of the zinc tape.

Once all the pieces of zinc have been finished, with the help of a 2"brush, the seal around each circle of the special zinc pieces used to protect the side faces of the flanged union is applied. In this way we avoid the penetration of external agents in the adhesive layer of the special pieces of zinc. With these applications all the outer surfaces of the flanged connection are completely protected with the exception of the studs and clamping nuts. 3. - For the inner protection, or internal faces or internal groove of the flanged joints as well as the nuts and bolts of subjection against the action of corrosion, we use a microcrystalline wax of petroleum that is a corrosion inhibitor, anti-flame, water repellent and has a great adherence to metal surfaces. It can work continuously at temperatures from -50 ° C to 80 ° C. It is supplied in blocks in solid state and for its application it must be heated to 86 ° C to handle it and apply it in liquid state. After applying it solidifies almost instantaneously on contact with the metal. The metal surface must be cleaned beforehand to obtain a degree of cleanliness to white metal.

For the application of microcrystalline petroleum wax in its liquid state, it uses an electric generator of approximately 4 kw, a circular electrical resistance of approximately 3 kw with integrated thermostat, and a metal trough, where microcrystalline wax blocks previously cut are emptied of approximately ·] 0 x10 x10 cms. to be heated. The circular resistance is fastened like a belt to the metal tank and connected to the electric generator where, after a certain time, the microcrystalline wax will pass from the solid state to the liquid state at a temperature of 86 ° C, then the filling will be carried out. the inner groove of each flanged union either in a vertical position or in a horizontal position.

To fill the groove of a vertical flange, a metal funnel is placed in the groove made in the zinc tape on the top of the flanged joint, with the help of a 1-I metallic bowl, the wax is taken liquid microcrystalline from the cuvette and carefully emptied to the flanged connection through the funnel, this operation is repeated until the slot is completely filled, this done, with a rag moistened with thinner, the spilled paraffin is cleaned and with the help of a pair of scissors, cut a special zinc piece of square shape of approximately 5 x 5 cm, remove its release paper just before putting it in contact with the metal surface, and place it on the existing slot, ensuring its adherence with the help of a rubber hammer. To fill a horizontal flange, 3 strips of rubber tape are placed over the groove of the flanged connection, spaced at a distance of 120 °, with the help of a cross screwdriver 3 holes are made 1/8" approximately in the places where the rubber bands were placed, a flexible folded straw is placed at 90 ° in each perforation, with the help of a metal syringe, the liquid icrocrystalline wax is absorbed from the metal trough and the flanged connection is injected very carefully through the existing slot, this operation is repeated until the slot is completely filled. The microcrystalline wax should partially fill each straw, which will indicate that the slot is filled completely with the microcrystalline wax. 3 straws and tapes are removed, with a cloth moistened with thinner, the spilled paraffin is cleaned and with the help of scissors, 4 square pieces of zinc of approximately 5 x 5 cm are cut, the desmoldante paper is removed just before putting them in contact with the metal surface, the slot and the 3 existing perforations are covered and its adhesion is ensured with the help of a rubber hammer. With these applications all the interior surfaces of the flanged union are completely protected with the exception of the studs and clamping nuts. The microcrystalline petroleum wax is also used for the external protection of the studs and outer clamping nuts. With the help of a 2"brush, the liquid microcrystalline wax is taken from the tray and carefully applied to each nut and fastening stud of the flanged joint until it is completely covered. The microcrystalline wax will instantly solidify on contact with the metal surface. 4. - High density polyethylene seals that fulfill two main functions, one as corrosion inhibitors and the other as mechanical protection and exposure to the sun's rays of microcrystalline petroleum wax.

To make the placement of high density polyethylene seals, take each one of them, they are presented in the fastening nut, taking care to center the 6 existing veins in each polyethylene seal against each of the flat faces of the hexagon of the nut, then, with a rubber hammer, pressure is applied to the polyethylene seals in each and every one of the nuts.

This system as a whole, apart from being very effective, is very aesthetic, the facilities look very modern and clean as they remove all traces of corrosion preventing rust from staining nearby facilities that no longer have to be repainted to improve their appearance .

BRIEF DESCRIPTION OF THE FIGURES.

Fig. 1 Side view with details of the components of the anticorrosive zinc tape.

Fig.2 Front and side views with detail of the protection of the side faces of the flanged joints with zinc tape.

Fig. 3 Front view with detail of the protection of the front faces of the flanged joints with zinc tape.

Fig.4 Side view with the protection detail of the electroconductive adhesive of the zinc tape with a fast-drying weatherstrip in the circular cuts of the special zinc pieces of zinc tape.

Fig. 5 Front view of the equipment with the detail of the heating of the microcrystalline oil wax.

Fig. 6 Front view with detail of filling with microcrystalline petroleum wax in a vertical flanged connection.

Fig. 7 Frontal view with filling detail with microcrystalline petroleum wax in a horizontal flanged union.

Fig. 8 Front view with detail of the protection with microcrystalline oil wax of asparagus and clamping nuts of the flanged joints.

Fig. 9 Front view of the configuration of high density polyethylene seals.

Fig. 10 Front view of the placement of polyethylene seals in the flanged joints.

DETAILED DESCRIPTION OF THE INVENTION The invention is supported by a high purity zincanticorrosive (l) tape (99.90% zinc by weight) with a uniform thickness of 0.080 mm. It is provided with an electroconductive adhesive (2), of acrylic type with a uniform thickness of 0.025 mm., Which can withstand temperatures from -50 ° C to + 130 ° C., The temperature for its application is + 8 ° C at + 40 ° C., and of a silicon release paper (3) of uniform thickness of .08 mm thickness.

For the protection with anticorrosive zinc tape of the side faces (4) of a vertical flange connection (5) or a horizontal flange connection (36), the following operations must be carried out: With the help of at least one manual shear ( 6), cut at least one special piece of zinc (7) in the form of an isosceles trapezoid and with the help of at least a pair of scissors (8) make at least one special piece of zinc (7) at least one cut circular (9) centered on at least one special piece of zinc (7) and to the extent corresponding to the size of at least one vertical flange connection (5) or at least one horizontal flange connection (36) and at least a clamping nut (10), gradually remove at least one release paper (3) from at least one special piece of zinc (7) just before putting it in contact with the metal surface, apply at least one special piece of zinc (7) on the metal surface through at least one circular cut (9), centering it with the outer diameter of at least one retaining nut (10), ensuring its adhesion with at least one wooden spatula (11). In the case of at least one vertical flange (5), the special zinc pieces (7) must always be applied from at least one lower nut (12) to at least one top nut (13) with at least one overlap (14) of at least 1 cm on each side, and apply as many special pieces of zinc (7) as retaining nuts (10) corresponding to at least one vertical flanged connection ( 5) or at least one horizontal flange connection (36).

For the protection with anticorrosive zinc tape of the front faces (15), of a vertical flange connection (5) or a horizontal flange connection (36), the following operations must be carried out: With the help of at least one manual shear ( 6), cut at least one rectangular piece of zinc (16) of the total width of at least one front face (15) according to the measurement corresponding to the size of at least one vertical flange connection (5) or by at least one horizontal flanged connection (36) per 30 cms. in length, gradually remove at least one release paper (3) from at least one rectangular piece of zinc (16) just before contacting it with the metal surface, apply at least one rectangular piece of zinc (16) on the metallic surface, aligning it to at least one front face (15) of at least one vertical flange connection (5) or at least one horizontal flange connection (36), ensuring its adhesion with at least one wooden spatula ( eleven). In the case of at least one vertical flange (5) the rectangular pieces of zinc (16) should always be applied from the bottom to the top, with at least a minimum overlap (17) of 1.5 cm on each side, and the number of rectangular pieces of zinc (16) necessary to cover the entire perimeter should be applied. Finally, with the help of at least one cutter (18) make a cut of approximately 1.5 x 1.5 cm in the groove (19) of the upper part of at least one vertical flanged connection (5) and on either side of the groove (19) in at least one horizontal flange connection (36) to subsequently carry out the internal corrosion protection thereof.

The invention is also supported by a transparent seal (20) of rapid drying against weathering.

For the protection of Electroconductive adhesive (^ against weathering, the following operations must be carried out: with the help of at least a 2"brush (21) apply at least one liquid seal against weathering (20) fast drying at least a circular cut-out (9) of at least one special piece of zinc (7) of at least one side face (4) of at least one vertical flange connection (5) or at least one horizontal flange connection (36) .

The invention is also supported by a microcrystalline petroleum wax in the solid state (22), which is a brown corrosion inhibitor, with a specific gravity at 25 ° C of 0.88 to 0.94, with a minimum flash point of 176 °. C, with a melting point of 71 ° C to 80 ° C, with a water penetration at 25 ° C from 26 to 50, and with a dielectric strength of 100 volts / mil., Has a high adhesion to metal surfaces in general and can work continuously at temperatures from -50 ° C to 80 ° C, it is supplied in a solid state and for its application it must be heated to 86 ° C to handle it and apply it in a liquid state, when applied it solidifies almost instantaneously on contact with metal surfaces. The metal surface must be cleaned beforehand to obtain a degree of cleanliness to white metal.

For the inner protection of a vertical flange connection (5) or a horizontal flange connection (36), with solid petroleum microcrystalline wax (22) the following operations must be carried out: Fill with gasoline at least one electric generator (24) of approximately 4 kw, place at least one circular electric resistance (25) of approximately 3 kw with at least one integrated thermostat (26) in at least one 20 liter metal tank (27), adjust at least one thermostat (26). ) of at least one circular resistance (25) at a temperature of 100 ° C. Empty at least a metal cuvette (27) of at least one microcrystalline wax (22) in blocks of 10 x 10 x 10 cm approximately until it is completely filled, covering it with at least one metal cover (28), lighting at least one electric generator (24), connect it to at least one circular electrical resistance (25) and after a certain time, at least one microcrystalline wax (22) will pass to the liquid state at a temperature of 86 ° C, then it will proceed to fill at least one slot (19) of at least one vertical flange connection (5) or at least one horizontal flange connection (36).

To fill a vertical flange connection (5), the following operations must be carried out: Place at least one groove (19) in the upper part of at least one vertical flange connection (5) at least one funnel metallic (29), with the help of at least one metallic bowl of 1 It, (30), take at least one liquid microcrystalline wax (31) from at least one metal bucket (27) and empty it very carefully to at least one vertical flange connection (5) through at least one metal beam (29), repeat this operation until completely filling at least one groove (19). With at least one rag (32) moistened with at least onethinner (33), clean at least one liquid microcrystalline (31) spill and with the help of at least one scissors (8), cut at least one square piece of zinc (34) of approximately 5 x 5 cm., remove at least one release paper (3) from the zinc square part (34) just before putting it in contact with the metal surface, cover the slot (19) and secure its adhesion with the help of at least one rubber hammer (35).

To perform the filling of a horizontal flanged connection (36), the following operations must be carried out: Place at least 3 strips of adhesive tape (37) over at least one groove (19) of at least one horizontal flange connection (36), separated at a distance of 120 °, with the help of at least one cross-head screwdriver approximately 1/8"in diameter (38) make 3 holes in the places where the rubberized tapes were placed (37), place at less a flexible straw (39) bent at 90 ° in each perforation, with the aid of at least one metal syringe (45), sucking at least one liquid microcrystalline wax (31) from at least one metal trough (27) and injecting it very carefully in at least one horizontal flange connection (36) through at least one slot (19), repeat this operation until it is completely filled. At least one liquid microcrystalline wax (31) must partially fill at least 3 flexible straws (39), which indicate that at least one slot (19) is completely filled with at least one liquid microcrystalline wax (31), remove at least the 3 flexible straws (39) and at least the 3 rubberized straps (37), with at least one cloth (32) moistened with at least one thinner (33), clean at least one wax liquid microcrystalline (31) spilled and with the help of at least a pair of scissors (7), cut at least 4 square pieces of zinc (34) of approximately 5 x 5 cm, remove at least one release paper (3) just before contacting them with the metal surface, cover at least one slot (19) and at least the 3 existing perforations and ensure their adhesion with the aid of at least one rubber hammer (35).

To carry out the external protection, the studs (41) and nuts (10) must perform the following operations: With the help of a 2"brush (21), take at least one liquid microcrystalline wax (31). at least one metal cube (27) and carefully apply it to at least one stud (41) and at least one retaining nut (10) of at least one vertical flange connection (5), or at least one horizontal flange connection ( 36) until covering them completely. The liquid microcrystalline wax (31) will instantly solidify on contact with the metal surface. With at least a cloth (32) moistened with at least one thinner (33), clean at least one liquid microcrystalline wax (31) spilled.

The invention is also supported by high density polyethylene seals (42), which fulfill two basic functions, one as corrosion inhibitors and the other as mechanical protection and exposure to the sun's rays of microcrystalline petroleum wax (31) . Its configuration allows it to encapsulate both the stud (41) and the clamping nut (10), and is designed to operate continuously at temperatures up to 120 ° C., Its largest diameter (43) is configured with 6 triangular veins ( 44), which center the seal (42) on the faces of the hexagon of the nuts (10) and have an angle of inclination that allows them to adjust to the size of each nut (10) so that they are assembled under pressure.

To assemble the polyethylene seals (42), the following operations must be carried out: Take at least one polyethylene seal (42), present it in at least one retaining nut (10), taking care to center the seals. existing veins (44) of at least one polyethylene seal (42) with each of the flat faces of the hexagon of at least one retaining nut (10) and at least one retaining stud (41), then, with at least one rubber hammer (35), press-fit the polyethylene seals (42) into each and every one of the nuts (10) and at least one retaining stud (41) protected with at least one liquid microcrystalline wax (31).

Claims (22)

1. A method for protecting at least one flanged connection (5 or 36) against the action of external corrosion comprising the steps of: · Apply at least one anticorrosive zinc tape (1, 2.3), on at least one side face (4) of the at least one flanged joint (5 or 36); • applying at least one anticorrosive zinc tape (1,2,3), on at least one front face (15) of the at least one flanged joint (5 or 36), covering a groove (19) formed in said front face (15); · Drill the zinc tape (1, 2.3) right into the slot (19) and apply a microcrystalline petroleum wax (22); • cover the perforation made on the zinc tape (1,2,3) on the front face.

2. A method as defined in claim 1, characterized in that it also comprises applying an anticorrosive zinc tape (1,2,3), on a second side face (4) of the at least one flanged connection (5 or 36).

3. A method as defined in any of claims 1 or 2, characterized in that the lateral faces (4) of the flanged connection (5 or 36) comprise a plurality of clamping nuts (10) and the step of applying at least one zinc tape (1,2,3) on at least one side face (4) through at least one nut (10).

4. A method as defined in claim 3 characterized in that to cover at least one side face (4j) through a nut (10), a special piece of zinc in the form of an isosceles trapezium must be cut, to which makes a cut circular (9) to form a special piece of zinc (7), which is applied to the side face (4) through the circular cut (9) and in each the nut (10)

5. A method as defined in claim 4 characterized in that the entire side face (4) is covered through the plurality of nuts (10) with a plurality of special pieces of zinc (7).

6. A method as defined in any of claims 3 to 5, characterized in that it also comprises applying at least one liquid seal against rapid drying (20) in the circular section (9) of at least one special piece of zinc (7) of the lateral face (4) of the flanged connection (5 or 36).

7. A method as defined in any of claims 1 to 6 characterized in that in the step of applying at least one zinc tape (1, 2,3) on at least one front face (15), it must be cut at least less a rectangular piece of zinc (16) of the total width of at least one front face (15) according to the measurement corresponding to the size of at least one flanged connection (5 or 36), apply at least one piece rectangular zinc (16) on the metal surface of the flanged joint.

8. A method as defined in any of claims 1 to 7 characterized in that in the step of applying the microcrystalline petroleum wax (22), first heat at least one microcrystalline petroleum wax (22) using an electric generator (24) to provide electrical power to at least one circular electrical resistance (25), said electrical resistance comprises an integrated thermostat (26).

9. A method as defined in any of the preceding claims, characterized in that the flanged connection can be a vertical flange connection (5) or a horizontal flange connection (36).

10. A method as defined in claim 9, characterized in that in order to apply the microcrystalline wax in a vertical flange connection (5) at least one metallic bowl (30) must be used to empty the liquid microcrystalline wax (31) through a metal funnel (29) in the hole made in the at least one slot (19) of at least one vertical flange connection (5).

11. A method as defined in claim 9, characterized in that in order to apply the microcrystalline wax in a horizontal flange connection (36), at least one rubber band (37) must be placed on at least one groove (19) of the horizontal flange ( 36), preferably use a cross screwdriver (38) to make a 1/8"hole in the rubber band (37) and at the same time in the zinc tape, use at least one flexible straw (39) bent at 90 ° in the said perforation of the rubber band (37) and using at least one metal syringe (40) to inject at least one liquid microcrystalline wax (31) to the horizontal flange connection (36).

12. A method as defined in any of claims 10 or 11, characterized in that a cloth (32) moistened with thinner (33) can be used to clean the liquid microcrystalline wax (31) from at least one vertical flange connection (5) and at least one horizontal flange connection (36).

13. A method as defined in any of the preceding claims characterized in that said method is applied in surface installations and that are capable of operating in continuous work with temperatures of up to 80 ° C.

14. A method as defined in claim 6 characterized in that at least one high density polyethylene seal (42) is placed in at least one retaining nut (10) and, if applicable, in a stud (41) that stands out from said nut (10) of the flanged connection, said seal (42) is placed with a rubber hammer (35).

15. A method as defined in any of the preceding claims characterized in that the anticorrosive zinc tape (1) is of high purity (99.90% zinc by weight) with a uniform thickness of 0.080 mm, is provided with an electroconductive adhesive ( 2), of acrylic type with a uniform thickness of 0.025 mm., Which can withstand temperatures from -50 ° C to + 130 ° C., The temperature for its application is + 8 ° C to + 40 ° C., And of a silicon release paper (3) of uniform thickness of .08 mm thickness.

16. A method as defined in claim 15 characterized in that for the application of the tape, the release paper (3) must be detached to be able to apply it to the flanged connection by means of a wooden spatula (11) to ensure its longitude.

17. A method as defined in any of claims 15 or 16 characterized in that a manual shear (6), scissors (8) and a cutter (18) can be used to cut the tape.

18. A method as defined in any of the preceding claims characterized in that the microcrystalline petroleum wax (22, 31), which is a brown corrosion inhibitor, with a specific gravity at 25 ° C of 0.88 to 0.94, with a minimum flash point of 176 ° C, with a melting point of 71 ° C to 80 ° C, with a water penetration at 25 ° C from 26 to 50, and with a dielectric strength of 100 volts / mil., It has a great adherence to metal surfaces in general and can work continuously at temperatures from -50 ° C to 80 ° C, is supplied in solid state (22) and for its application must be heated to 86 ° C to handle it and apply it in a liquid state (31), when applied it solidifies almost instantaneously on contact with metal surfaces.

19. A method as defined in any of claims 10 or 11, characterized in that when emptying the wax in the vertical or horizontal flanged connection it makes contact with the studs joining said flanged union.

20. A method as defined in any of claims 10, 11 or 19, characterized in that when emptying the wax in the vertical or horizontal flanged connection, additional perforations must be made to the zinc tape to allow the air contained in the slot to escape (19). ).

21. A method such as that defined in claim 20, characterized in that after perforation the perforations that allow air to escape must be covered with zinc tape.

22. A method as defined in any of the preceding claims, characterized in that at least one square piece of zinc (34) must be cut to cover the slot (19) and the perforations made in the zinc strip that allow air to escape.