WO2015108405A1 - Procédé de protection anti-corrosion pour raccords à brides - Google Patents

Procédé de protection anti-corrosion pour raccords à brides Download PDF

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Publication number
WO2015108405A1
WO2015108405A1 PCT/MX2014/000191 MX2014000191W WO2015108405A1 WO 2015108405 A1 WO2015108405 A1 WO 2015108405A1 MX 2014000191 W MX2014000191 W MX 2014000191W WO 2015108405 A1 WO2015108405 A1 WO 2015108405A1
Authority
WO
WIPO (PCT)
Prior art keywords
flanged joint
zinc
microcrystalline
groove
wax
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/MX2014/000191
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English (en)
Spanish (es)
Inventor
David NUÑEZ CARDENAS
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of WO2015108405A1 publication Critical patent/WO2015108405A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • F16L58/08—Coatings characterised by the materials used by metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/18—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings
    • F16L58/187—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings for flanged joints

Definitions

  • This invention corresponds in its essence to the field of chemical engineering, with galvanic protection and corrosion inhibition being the most important matters, since the main processes of operation of the system have to do with the electrochemical mechanism of metals, in this case , zinc as a sacrificial anode, carbon steel as a cathode and humidity of the environment as an electrolyte. Both metals and the humidity of the environment interact in a very intimate way depending on their physicochemical properties to form a galvanic cell in which the free electrons of zinc or anodic zone circulate through the metal mass accumulating in the steel or cathodic zone. No less important is the additional mixture of other corrosion inhibitor components that are used as a whole and configure a very efficient system for the corrosion protection of flanged joints.
  • the pipes transport and distribute products more economically and in large quantities worldwide.
  • the most used energy 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. day, 365 days a year. Thanks to these transport systems, it is possible to access these energy sources safely and economically. Given the importance of this means of transport, the use of flanged joints in carbon steel pipe circuits represents a very important part of this transport system.
  • Flanged carbon steel joints are mechanical elements used in liquid or gas transportation systems through pipeline circuits.
  • the advantage offered by the use of flanged joints lies in the fact that because they are joined by studs and clamping nuts, they allow a quick assembly and disassembly of the elements that make up the pipe circuits in order to carry out repairs or maintenance work.
  • our goal is to contribute to the solution to solve corrosion problems in flanged joints to reduce operation and maintenance costs and at the same time increase the safety conditions of aerial pipeline transportation systems.
  • Stainless Steel Belts or Protective Bands Kleerband flange Protectors that are belts or bands of corrosion-inhibiting vinyl
  • Enviropeel System which is a Thermoplastic corrosion inhibitor wrap
  • Petrolatum Tapes which are fabrics impregnated with saturated oil and inert siliceous fillers
  • Microcrystalline oil wax Radolid Protection Caps that are high density polyethylene plugs corrosion inhibitors for the external protection of nuts and studs etc.
  • Flanged joints need to protect against corrosion the following basic components: The gaskets or seals of the flanged joint, their inner faces, their front faces, their side faces, studs and clamping nuts.
  • This invention relates to a method for integral anticorrosive protection of flanged joints operating at temperatures from -50 ° C to + 80 ° C continuously and that can be guaranteed for at least 30 years without corrosion problems.
  • This system fully encapsulates flanged joints since no interior or exterior surface is left unprotected.
  • four basic materials are needed:
  • an electro-conductive acrylic adhesive of a uniform thickness of 0.025 mm., Which can withstand temperatures from -50 ° C to + 130 ° C, and the temperature for its application is from + 8 ° C to + 40 ° C.
  • the metal surface must be cleaned before obtaining a white metal cleaning grade.
  • the adhesive is called Electroconductive because it is provided with small zinc particles of homogeneous size and shape, dispersed uniformly over the acrylic base, these particles ensure an electrical conductivity to the adhesive and a metallic continuity between zinc and steel, such so that if this coating is damaged somewhere, an electrolyte will be filtered in the damaged place through the atmosphere, then, between the metallic surfaces a galvanic cell will be verified, in which the zinc will assume the function of anode, dissolving and protecting the metal surface or cathode of the battery (Fe). (Galvanic protection by cold rolling).
  • each piece of paper is removed from its release agent just before putting it in contact with the metal surface and applied by aligning it to the front faces of the flanged joint, ensuring its adhesion with a wooden spatula.
  • 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 number of pieces necessary to cover the entire perimeter must be applied of the flanged joint.
  • a cut of approximately 1.5 x 1.5 cm is made in the groove of the flanged joint to carry subsequently, the internal protection of it.
  • the metallic surfaces must be cleaned before obtaining a degree of cleanliness to white metal.
  • microcrystalline oil wax that is a corrosion inhibitor, anti-flame, repellent to water and has great adhesion 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 upon contact with the metal. The metal surface must be cleaned before obtaining a white metal cleaning grade.
  • an electric generator of approximately 4 kw is used, a circular electrical resistance of approximately 3 kw with integrated thermostat, and a metal bucket, where microcrystalline wax blocks are previously emptied cut of approximately 10 x10 x 10 cms.
  • the circular resistance is attached as a belt to the metal bucket and is connected to the electric generator where after a certain time, the microcrystalline wax will pass from the solid state to the liquid state to a temperature of 86 ° C, then the internal groove of each flanged joint is filled either vertically or horizontally.
  • 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 It metal bowl, the wax is taken liquid microcrystalline from the cuvette and the flanged joint is carefully emptied through the funnel, this operation is repeated until the groove is completely filled, done with a cloth dampened with thinner, the spilled paraffin is cleaned and with the help of a pair of scissors, a special piece of zinc of square shape of approximately 5 x 5 cm is cut, its release paper is removed just before putting it in contact with the metal surface, and it is placed on the existing groove, ensuring its adhesion with the help of a rubber hammer.
  • spiked tapes 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, Remove the release paper just before putting them in contact with the metal surface, cover the groove and the 3 existing perforations and ensure their adhesion with the help of a rubber hammer. With these applications all inner surfaces of the flanged joint are fully protected with the exception of studs and clamping nuts.
  • microcrystalline oil wax is also used for the external protection of external studs and clamping nuts. With the help of a 2 "brush, the liquid microcrystalline wax is taken from the cuvette and carefully applied to each nut and clamping stud of the flanged joint until it is completely covered. The microcrystalline wax will instantly solidify upon contact with the metal surface.
  • Fig. 1 Side view with the detail of the components of the anticorrosive zinc tape.
  • Fig. 2 Front and side views with the detail of the protection of the lateral faces of the flanged joints with zinc tape.
  • FIG. 3 Front view with the detail of the protection of the front faces of the flanged joints with zinc tape.
  • Fig. 4 Side view with the detail of the protection of the electroconductive adhesive of the zinc tape with a seal for fast drying weathering 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 the detail of filling with microcrystalline oil wax in a vertical flanged joint.
  • Fig. 7 Front view with the detail of filling with microcrystalline oil wax in a horizontal flanged joint.
  • Fig. 8 Front view with the detail of the protection with microcrystalline wax from asparagus oil and fastening 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 flanged joints. DETAILED DESCRIPTION OF THE INVENTION
  • the invention is supported by a high purity anticorrosive zinc strip (1) (99.90% zinc by weight) with a uniform thickness of 0.080 mm. It is provided with an electro-conductive adhesive (2), of an acrylic type of 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 a silicone release paper (3) of uniform thickness of .08 mm thick.
  • At least one cutter (18) make a cut of approximately 1.5 x 1.5 cm in the groove (19) of the top of at least one vertical flanged joint (5) and on either side of the groove (19) in at least one horizontal flanged joint (36) to subsequently carry out the internal corrosion protection thereof.
  • the invention is also supported by a transparent seal (20) for rapid drying against weathering.
  • Electroconductive adhesive (2) For the protection of the Electroconductive adhesive (2) 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) for quick drying in at least one circular cut (9) of at least one special piece of zinc (7) of at least one side face (4) of at least one vertical flanged joint (5) or at least one horizontal flanged joint (36).
  • the invention is also supported by a solid-state microcrystalline petroleum wax (22), which is a brown-colored 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 penetration of water at 25 ° C from 26 to 50, and with a dielectric strength of 100 volts / mil.
  • a solid-state microcrystalline petroleum wax 22
  • a solid-state microcrystalline petroleum wax which is a brown-colored 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 penetration of water at 25 ° C from 26 to 50, and with a dielectric strength of 100 volts / mil.
  • At least one liquid microcrystalline wax (31) must partially fill at least 3 straws f lexibles (39), which indicate that at least one slot (19) is completely filled with at least one liquid microcrystalline wax (31), remove at least 3 flexible straws (39) and at least 3 tapes hoisted (37), with at least one cloth (32) moistened with at least one thinner (33), clean at least one spilled liquid microcrystalline wax (31) and with the help of at least 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 putting them in contact with the metal surface, cover at least one slot (19 ) and at least the 3 existing perforations and ensure their adhesion with the help of at least one rubber hammer (35).
  • the studs (41) and clamping nuts (10) must perform the following operations: With the help of a 2 "brush (21), take at least one liquid microcrystalline wax (31) in order to at least one metal bowl (27) and carefully apply it in at least asparagus (41) and at least one clamping nut (10) of at least one vertical flanged joint (5), or at least one horizontal flanged joint (36) until completely covered. ,
  • Liquid microcrystalline (31) will instantly solidify upon contact with the metal surface. With at least one cloth (32) moistened with at least one thinner (33), clean at least one spilled liquid microcrystalline wax (31).
  • 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 sunlight from microcrystalline oil 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 hexagon faces 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.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Prevention Of Electric Corrosion (AREA)

Abstract

Le présent système consiste en un procédé destiné à protéger au moins un raccord à bride vertical (5) ou au moins un raccord à bride horizontal (36) contre l'action de la corrosion extérieure dans des installations superficielles, pouvant fonctionner en continu à des températures pouvant atteindre 80°C. Ce procédé comprend les étapes consistant à appliquer au moins une bande de zinc anti-corrosion (1, 2, 3) sur au moins une face latérale (4) et sur au moins une face avant (15) d'au moins un raccord à bride vertical (5) et d'au moins un raccord à bride horizontal (36), à appliquer au moins un joint (20) transparent contre les intempéries et la pénétration d'agents extérieurs sur au moins un adhésif électroconducteur (2) d'au moins un évidement circulaire (9) d'au moins une pièce spéciale de zinc (7), à appliquer au moins une cire microcristalline de pétrole (22) dans au moins une rainure (19) et sur au moins un goujon de fixation (41) et sur au moins un écrou de fixation (10) d'au moins un raccord à bride vertical (5) et d'au moins un raccord à bride horizontal (36), et à appliquer un joint de polyéthylène haute densité (42) sur au moins un goujon de fixation (41) et sur au moins un écrou de fixation (10) d'au moins un raccord à bride vertical (5) et d'au moins un raccord à bride horizontal (36).
PCT/MX2014/000191 2014-01-20 2014-12-03 Procédé de protection anti-corrosion pour raccords à brides Ceased WO2015108405A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
MX2014000780A MX2014000780A (es) 2014-01-20 2014-01-20 Metodo de proteccion anticorrosiva para uniones bridadas.
MXMX/A/2014/000780 2014-01-20

Publications (1)

Publication Number Publication Date
WO2015108405A1 true WO2015108405A1 (fr) 2015-07-23

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Application Number Title Priority Date Filing Date
PCT/MX2014/000191 Ceased WO2015108405A1 (fr) 2014-01-20 2014-12-03 Procédé de protection anti-corrosion pour raccords à brides

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MX (1) MX2014000780A (fr)
WO (1) WO2015108405A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0296821A1 (fr) * 1987-06-24 1988-12-28 Leck Haslam Limited Dispositif anticorrosif pour brides
US6142579A (en) * 1998-05-27 2000-11-07 Radolid Thiel Gmbh Corrosion protection cap for polygonal nuts
US20110260443A1 (en) * 2007-04-26 2011-10-27 Petroleo Brasileiro S.A. Corrosion management systems for controlling, eliminating and/or managing corrosion
US8562771B2 (en) * 2010-07-20 2013-10-22 Tenaris Connections Limited Joints having improved sealability, lubrication and corrosion resistance

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0296821A1 (fr) * 1987-06-24 1988-12-28 Leck Haslam Limited Dispositif anticorrosif pour brides
US6142579A (en) * 1998-05-27 2000-11-07 Radolid Thiel Gmbh Corrosion protection cap for polygonal nuts
US20110260443A1 (en) * 2007-04-26 2011-10-27 Petroleo Brasileiro S.A. Corrosion management systems for controlling, eliminating and/or managing corrosion
US8562771B2 (en) * 2010-07-20 2013-10-22 Tenaris Connections Limited Joints having improved sealability, lubrication and corrosion resistance

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
THE AUSTRALIAN PIPELINER, October 2005 (2005-10-01), pages 80 *

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Publication number Publication date
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