EP1660776B1 - Dispositif de protection contre la corrosion galvanique pour pompe - Google Patents

Dispositif de protection contre la corrosion galvanique pour pompe Download PDF

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Publication number
EP1660776B1
EP1660776B1 EP04763633A EP04763633A EP1660776B1 EP 1660776 B1 EP1660776 B1 EP 1660776B1 EP 04763633 A EP04763633 A EP 04763633A EP 04763633 A EP04763633 A EP 04763633A EP 1660776 B1 EP1660776 B1 EP 1660776B1
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EP
European Patent Office
Prior art keywords
pumping
sacrificial anode
pump
pumping means
flow
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.)
Active
Application number
EP04763633A
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German (de)
English (en)
Other versions
EP1660776A1 (fr
Inventor
Antonio Gambigliani Zoccoli
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Caprari SpA
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Caprari SpA
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Publication date
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Publication of EP1660776A1 publication Critical patent/EP1660776A1/fr
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Publication of EP1660776B1 publication Critical patent/EP1660776B1/fr
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
    • C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
    • C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
    • C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
    • C23F13/20—Conducting electric current to electrodes
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
    • E21B41/02—Equipment or details not covered by groups E21B15/00 - E21B40/00 in situ inhibition of corrosion in boreholes or wells
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B47/00—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B47/00—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
    • F04B47/06—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps having motor-pump units situated at great depth
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
    • F04D13/10—Units comprising pumps and their driving means the pump being electrically driven for submerged use adapted for use in mining bore holes

Definitions

  • the present invention relates to a galvanic corrosion protection apparatus.
  • Such an apparatus is particularly suitable for being used for the protection of submersible pumps such as well pumps.
  • the apparatus according to the invention is suitable for preventing the occurrence of corrosion on the structural metal parts of the submersible pumps, particularly in well installations in which the presence of stray currents in the terrain and/or the presence of groundwater particularly rich in salt due to infiltrations of seawater makes the resistance of the metal parts to electrochemical corrosion critical.
  • These pumps are normally in metal or in metal alloys that are subject to corrosion phenomena that consist of the dissolution of the metal material in the surrounding liquid and are particularly accentuated in the zones of the pump that are in contact with the liquid, especially if salts are dissolved in this liquid that increase its electric conductivity.
  • Protection systems are known for apparatuses that operate in contact with or submerged inside liquids, which systems have the aim of reducing corrosion phenomena in such apparatuses and thus prolonging their working life.
  • devices are known that are suitable for protecting said apparatuses from corrosion, such devices being formed of so-called sacrificial anodes.
  • the sacrificial anodes are made of metal materials that are less noble than those with which the apparatus to be protected is made, namely metal materials that have lower electrochemical potential than those of the metal materials that constitute the apparatus to be protected and therefore corrode more easily. Owing to the lower electrochemical potential, the oxidation and dissolution of the sacrificial anode rather than the apparatus to be protected are encouraged.
  • the dispersion of the galvanic current that passes through the apparatus is concentrated on the sacrificial anode, thereby preserving the apparatus from corrosion.
  • Well pumps comprise an actuating motor arranged axially in relation to the pump.
  • the sacrificial anodes which for reasons of space cannot be placed to the side of the pump or the motor, are fixed underneath the base of the motor, namely at the part of the motor that is furthest from the pump.
  • Another drawback of the protection system disclosed above consists of the fact that it enables protection having limited duration over time to be achieved.
  • the galvanic current is dissipated at the pump and/or the motor associated with it, which are thus subject to corrosion.
  • the sacrificial anodes disclosed above are provided with fixing elements, for example threaded fixing elements, arranged to connect such sacrificial anodes to the actuating motor of a pump.
  • Prior-art fixing elements are made of a more noble metal than the metal with which the sacrificial anode is made.
  • EP 0893684 and EP 1120644 disclose a method of effecting a computerized analysis for predicting corrosion, in particular galvanic corrosion, and corrosion prevention of metals.
  • EP 0893684 and EP 1120644 also disclose a seawater pump (10), which is used for exemplifying a system on which the method can be applied.
  • the seawater pump (10) comprises three annular sacrificial zinc anodes (11a, 11b, 11c) circumferentially arranged on an inner pump surface and four prismatic sacrificial zinc anodes (12) circumferentially arranged on an outer pump surface at equally spaced locations, the annular sacrificial zinc anodes (11a, 11b, 11c) and the prismatic sacrificial zinc anodes (12) communicating with each other through seawater.
  • One object of the invention is to improve known corrosion protection systems.
  • a further object is to provide a corrosion protection apparatus that is provided with significant efficacy.
  • a yet further object is to provide a corrosion protection apparatus that performs its protection function over a prolonged period of time.
  • Yet another object is to provide a corrosion protection apparatus that has a moderate cost.
  • a galvanic protection apparatus is provided as defined in Claim 9.
  • the flow of fluid removes from a surface of the sacrificial anode a layer of oxide that may have formed following corrosion of the anode.
  • the galvanic protection apparatus is effective for rather a long time, namely until the sacrificial anode has completely dissolved.
  • a pump is provided as defined in Claim 1.
  • the dispersion of the currents is therefore concentrated at the sacrificial anode means.
  • a pumping device 10 comprising a pump 1 and a motor 2 arranged to actuate the pump 1.
  • the pump 1 is fixed to the motor 2 by screw-type fixing elements that are not shown.
  • the pumping device 10 is furthermore provided with galvanic protection means 3 comprising a sacrificial anode 4 made from a metal material having electrochemical potential that is lower than that of the metal material of which the pump 1 is made and of the metal material of which the motor 2 is made.
  • the galvanic currents that are present on the pump 1 and on the motor 2 transfer to the sacrificial anode 4 through which they are dispersed.
  • the sacrificial anode 4 thus corrodes, preventing corrosion from affecting the pump 1 and the motor 2, thereby enabling the operating life of the pumping device 10 to be prolonged.
  • the sacrificial anode 4 is interposed between the pump 1 and the motor 2 in such a way that the galvanic currents on the pump 1 can reach the sacrificial anode 4 encountering limited resistance, unlike what occurs in prior-art pumping devices. In such devices in fact the current has to pass through the motor to transfer from the pump to the sacrificial anode.
  • the sacrificial anode 4 comprises a fixture portion 5 arranged to fix the sacrificial anode 4 to the motor 2 and an active portion 6 that is in contact with a flow of fluid that flows in the direction F inside the pump 1.
  • the galvanic protection means 3 is exposed to the flow of fluid entering the pump 1, especially on an end surface 7 and on a side surface 18 located substantially perpendicularly to one another - which are therefore the most active in the process of galvanic protection.
  • the fixture portion 5 and the active portion 6 have an annular shape, the diameter of the active portion 6 being less than the diameter of the fixture portion 5.
  • the pump 1 comprises a support element 11 in a side wall of which windows 19 are obtained that enable the inflow of the fluid inside the pump 1.
  • a seat 13 is obtained that cooperates with a base wall 14 of the motor 2 to define a chamber 15 arranged to receive the fixture portion 5.
  • the fixture portion 5 is tightened between the pump 1 and the motor 2.
  • the fixture portion 5 is not exposed to the flow of fluid and is not therefore subject to corrosion.
  • the fixture portion 5 can therefore be made of the same metal material with which the sacrificial anode 4 is made.
  • connecting elements such as for example threaded connecting elements that ensure the position of the sacrificial anode 4 in relation to the pump 1 and the motor 2.
  • the pumping device 10 is particularly inexpensive.
  • the corrosion phenomena of the pumping device 10 are concentrated in the active portion 6 of the sacrificial anode 4 that therefore tends to get covered by a layer of oxide.
  • the oxide that forms on the end surface 7 and on the side surface 18 of the active portion 6 following oxidation is continually removed by the fluid flow.
  • the protection efficacy of the sacrificial anode 4 remains virtually unaltered over time inasmuch as the dissipation of the galvanic currents is kept localised on the sacrificial anode 4.
  • the protection assured by the galvanic protection means 3 is very prolonged over time because it continues to prevent the corrosion of the pump 1 and of the motor 2 until the sacrificial anode 4 has dissolved completely.

Claims (12)

  1. Pompe comprenant des moyens de pompage (1) pour pomper un fluide et des moyens de protection cathodique galvanique (3, 4) prévus pour protéger lesdits moyens de pompage (1) contre la corrosion, lesdits moyens de protection cathodique galvanique (3) comprenant des moyens d'anode sacrificielle (4) couplés électriquement auxdits moyens de pompage (1) et disposés en contact direct avec lesdits moyens de pompage (1), caractérisée en ce qu'elle comprend en plus des moyens de moteur (2) prévus pour actionner lesdits moyens de pompage (1), lesdits moyens d'anode sacrificielle (4) étant disposés en contact direct avec lesdits moyens de moteur (2).
  2. Pompe selon la revendication 1, dans laquelle lesdits moyens d'anode sacrificielle (4) comprennent une portion (6) configurée de manière à interagir avec un écoulement dudit fluide pompé par lesdits moyens de pompage (1).
  3. Pompe selon la revendication 2, dans laquelle ladite portion (6) comprend deux surfaces (7, 18) exposées à l'écoulement, qui sont disposées sensiblement perpendiculaires l'une par rapport à l'autre.
  4. Pompe selon l'une quelconque des revendications 1 à 3, dans laquelle lesdits moyens d'anode sacrificielle (4) comprennent une autre portion (5) prévue pour permettre la fixation desdits moyens d'anode sacrificielle (4) auxdits moyens de pompage (1).
  5. Pompe selon la revendication 4 lorsqu'elle est dépendante de la revendication 2 ou 3, dans laquelle ladite portion (6) possède une dimension transversale inférieure à ladite autre portion (5).
  6. Pompe selon la revendication 4 ou 5, dans laquelle lesdits moyens de pompage (1) comprennent des moyens de siège (13) prévus pour recevoir ladite autre portion (5).
  7. Pompe selon la revendication 6, dans laquelle lesdits moyens de siège (13) sont configurés de manière à isoler ladite autre portion (5) dudit écoulement.
  8. Pompe selon l'une quelconque des revendications précédentes, et comprenant de plus un corps de support (11) dans une paroi latérale duquel sont ménagés (19) des moyens d'ouverture prévus pour permettre audit écoulement d'atteindre lesdits moyens de pompage (1) en progressant de manière sensiblement radiale par rapport auxdits moyens de pompage (1).
  9. Dispositif de protection cathodique galvanique pour un dispositif de pompage (10), comprenant des moyens d'anode sacrificielle (4) couplés électriquement à des moyens de pompage (1) dudit dispositif de pompage (10), lesdits moyens d'anode sacrificielle (4) comprenant une portion (6) configurée de manière à interagir avec un écoulement dudit fluide pompé par lesdits moyens de pompage (1), caractérisé en ce que lesdits moyens d'anode sacrificielle (4) comprennent une autre portion (5) prévue pour être serrée entre lesdits moyens de pompage (1) et des moyens de moteur (2) dudit dispositif de pompage (10) prévus pour actionner lesdits moyens de pompage (1).
  10. Dispositif selon la revendication 9, dans lequel ladite portion (6) comprend deux surfaces (7, 18) exposées à l'écoulement, qui sont disposées sensiblement perpendiculaires l'une par rapport à l'autre.
  11. Dispositif selon la revendication 9 ou 10, dans lequel ladite autre portion (5) est prévue pour être reçue dans des moyens de cavité (15) définis par lesdits moyens de pompage (1) et par lesdits moyens de moteur (2) de manière à être sensiblement isolée dudit écoulement de fluide.
  12. Dispositif selon l'une quelconque des revendications 9 à 11, dans lequel ladite portion (6) a une dimension transversale inférieure à ladite autre portion (5).
EP04763633A 2003-07-31 2004-07-29 Dispositif de protection contre la corrosion galvanique pour pompe Active EP1660776B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000224A ITMO20030224A1 (it) 2003-07-31 2003-07-31 Apparato di protezione galvanica da corrosione.
PCT/EP2004/008543 WO2005015024A1 (fr) 2003-07-31 2004-07-29 Dispositif de protection contre la corrosion galvanique pour pompe

Publications (2)

Publication Number Publication Date
EP1660776A1 EP1660776A1 (fr) 2006-05-31
EP1660776B1 true EP1660776B1 (fr) 2007-06-06

Family

ID=30012824

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04763633A Active EP1660776B1 (fr) 2003-07-31 2004-07-29 Dispositif de protection contre la corrosion galvanique pour pompe

Country Status (8)

Country Link
EP (1) EP1660776B1 (fr)
CN (1) CN100462563C (fr)
AT (1) ATE364138T1 (fr)
DE (1) DE602004006879D1 (fr)
DK (1) DK1660776T3 (fr)
ES (1) ES2287759T3 (fr)
IT (1) ITMO20030224A1 (fr)
WO (1) WO2005015024A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4567081B2 (ja) * 2008-09-29 2010-10-20 株式会社豊田中央研究所 流体ポンプ
UA109683C2 (uk) 2010-12-09 2015-09-25 Зміщений клапанний отвір у поршневому насосі
USD687125S1 (en) 2011-08-19 2013-07-30 S.P.M. Flow Control, Inc. Fluid end
CN104204519B (zh) 2012-02-01 2016-08-03 S.P.M.流量控制股份有限公司 具有集成腹板部分的泵流体端
USD679292S1 (en) 2012-04-27 2013-04-02 S.P.M. Flow Control, Inc. Center portion of fluid cylinder for pump
DE102013225827A1 (de) * 2013-12-13 2015-06-18 Em-Motive Gmbh Elektromaschineneinheit mit Korrosionsschutz durch Opferanode
DE102015119095B4 (de) 2015-11-06 2019-03-21 Pierburg Gmbh Kühlmittelpumpe für eine Verbrennungskraftmaschine

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4211625A (en) * 1978-09-11 1980-07-08 Borg-Warner Corporation Impressed current cathodic protection system for submersible downhole pumping assembly
US5183100A (en) * 1991-02-14 1993-02-02 Harrell Jr James E System for efficiently exchanging heat or cooling ground water in a deep well
JP3335884B2 (ja) * 1997-07-16 2002-10-21 株式会社荏原製作所 腐食・防食解析方法
NO307096B1 (no) * 1997-11-17 2000-02-07 Aker Offshore Partner As Korrosjonsbeskyttet metallkonstruksjon, for eksempel i form av en roerledning som kan inngå i et stooere roersystem
JP2000111510A (ja) * 1998-09-30 2000-04-21 Ebara Corp 腐食・防食解析方法

Also Published As

Publication number Publication date
ATE364138T1 (de) 2007-06-15
ITMO20030224A1 (it) 2005-02-01
EP1660776A1 (fr) 2006-05-31
DE602004006879D1 (de) 2007-07-19
WO2005015024A1 (fr) 2005-02-17
DK1660776T3 (da) 2007-10-08
CN1826471A (zh) 2006-08-30
CN100462563C (zh) 2009-02-18
ES2287759T3 (es) 2007-12-16
ITMO20030224A0 (it) 2003-07-31

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