WO2005015024A1 - Galvanic corrosion protection apparatus for a pump - Google Patents
Galvanic corrosion protection apparatus for a pump Download PDFInfo
- Publication number
- WO2005015024A1 WO2005015024A1 PCT/EP2004/008543 EP2004008543W WO2005015024A1 WO 2005015024 A1 WO2005015024 A1 WO 2005015024A1 EP 2004008543 W EP2004008543 W EP 2004008543W WO 2005015024 A1 WO2005015024 A1 WO 2005015024A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pump
- sacrificial anode
- pumping
- pumping means
- flow
- Prior art date
Links
- 238000005260 corrosion Methods 0.000 title claims abstract description 29
- 230000007797 corrosion Effects 0.000 title claims abstract description 29
- 238000005086 pumping Methods 0.000 claims abstract description 39
- 239000012530 fluid Substances 0.000 claims abstract description 16
- 239000007769 metal material Substances 0.000 description 9
- 239000006185 dispersion Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910000510 noble metal Inorganic materials 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 2
- 238000006056 electrooxidation reaction Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 230000009993 protective function Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
Classifications
-
- 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 OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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.
- the parts of the pumps that -are subject to corrosion deteriorate, causing local failure in the zones subject to corrosion, which in fact makes such pumps unusable.
- the apparatuses through which galvanic currents pass are exposed to corrosion in the zones in which dispersion of these currents occurs.
- 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 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.
- 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.
- Prior-art fixing elements are made of a more noble metal than the metal with which the sacrificial anode is made.
- a yet further object is to provide a corrosion protection apparatus that performs its protection function over a prolonged period of time.
- 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.
- Figure 1 is a schematic side view of a pump according to the invention.
- FIG. 2 is an enlarged and partially sectioned detail of Figure 1.
- a pumping device 10 is shown 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 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
- 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
- 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 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.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Prevention Of Electric Corrosion (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Medicines Containing Material From Animals Or Micro-Organisms (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04763633A EP1660776B1 (en) | 2003-07-31 | 2004-07-29 | Galvanic corrosion protection apparatus for a pump |
DE602004006879T DE602004006879D1 (en) | 2003-07-31 | 2004-07-29 | GALVANIC CORROSION PROTECTION FOR A PUMP |
DK04763633T DK1660776T3 (en) | 2003-07-31 | 2004-07-29 | Galvanic corrosion protection device for a pump |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT000224A ITMO20030224A1 (en) | 2003-07-31 | 2003-07-31 | CORALSION GALVANIC PROTECTION SYSTEM. |
ITMO2003A000224 | 2003-07-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005015024A1 true WO2005015024A1 (en) | 2005-02-17 |
Family
ID=30012824
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2004/008543 WO2005015024A1 (en) | 2003-07-31 | 2004-07-29 | Galvanic corrosion protection apparatus for a pump |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP1660776B1 (en) |
CN (1) | CN100462563C (en) |
AT (1) | ATE364138T1 (en) |
DE (1) | DE602004006879D1 (en) |
DK (1) | DK1660776T3 (en) |
ES (1) | ES2287759T3 (en) |
IT (1) | ITMO20030224A1 (en) |
WO (1) | WO2005015024A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2169235A3 (en) * | 2008-09-29 | 2012-06-27 | Aisin Seiki Kabushiki Kaisha | Hydraulic pump |
USD706397S1 (en) | 2011-08-19 | 2014-06-03 | S.P.M. Flow Control, Inc. | Portion of fluid end |
USD706833S1 (en) | 2012-04-27 | 2014-06-10 | S.P.M. Flow Control, Inc. | Center portion of a fluid cylinder for a pump |
US9784262B2 (en) | 2010-12-09 | 2017-10-10 | S.P.M. Flow Control, Inc. | Offset valve bore in a reciprocating pump |
US9945362B2 (en) | 2012-01-27 | 2018-04-17 | S.P.M. Flow Control, Inc. | Pump fluid end with integrated web portion |
US10731654B2 (en) | 2015-11-06 | 2020-08-04 | Pierburg Gmbh | Coolant pump for an internal combustion engine |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013225827A1 (en) * | 2013-12-13 | 2015-06-18 | Em-Motive Gmbh | Electric machine unit with corrosion protection by sacrificial anode |
Citations (5)
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 |
EP0499466A2 (en) * | 1991-02-14 | 1992-08-19 | Harrell, James Elton jr | System for efficiently exchanging heat or cooling ground water in a deep well |
EP0893684A1 (en) * | 1997-07-16 | 1999-01-27 | Ebara Corporation | Method of analyzing corrosion and corrosion prevention |
WO1999025899A1 (en) * | 1997-11-17 | 1999-05-27 | Aker Offshore Partner A.S | A corrosion-protected metal construction, e.g. in the form of a pipeline includable in a larger pipe system |
EP1120644A1 (en) * | 1998-09-30 | 2001-08-01 | Ebara Corporation | Corrossion/anticorrosion analysis method |
-
2003
- 2003-07-31 IT IT000224A patent/ITMO20030224A1/en unknown
-
2004
- 2004-07-29 CN CNB2004800213106A patent/CN100462563C/en not_active Expired - Fee Related
- 2004-07-29 DE DE602004006879T patent/DE602004006879D1/en active Active
- 2004-07-29 DK DK04763633T patent/DK1660776T3/en active
- 2004-07-29 EP EP04763633A patent/EP1660776B1/en active Active
- 2004-07-29 WO PCT/EP2004/008543 patent/WO2005015024A1/en active IP Right Grant
- 2004-07-29 ES ES04763633T patent/ES2287759T3/en active Active
- 2004-07-29 AT AT04763633T patent/ATE364138T1/en not_active IP Right Cessation
Patent Citations (5)
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 |
EP0499466A2 (en) * | 1991-02-14 | 1992-08-19 | Harrell, James Elton jr | System for efficiently exchanging heat or cooling ground water in a deep well |
EP0893684A1 (en) * | 1997-07-16 | 1999-01-27 | Ebara Corporation | Method of analyzing corrosion and corrosion prevention |
WO1999025899A1 (en) * | 1997-11-17 | 1999-05-27 | Aker Offshore Partner A.S | A corrosion-protected metal construction, e.g. in the form of a pipeline includable in a larger pipe system |
EP1120644A1 (en) * | 1998-09-30 | 2001-08-01 | Ebara Corporation | Corrossion/anticorrosion analysis method |
Non-Patent Citations (1)
Title |
---|
MATSUHO, M.; JUICHI, I.; KIKUO, K.; SHIGERU, A.: "Corrosion Protection Design of Seawater Pump Using Boundary Element Analysis", TABO KIKAI - TURBOMACHINERY, vol. 10, no. 23, 1995, ISSN 0385-8839, pages 590 - 596, XP002081512 * |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2169235A3 (en) * | 2008-09-29 | 2012-06-27 | Aisin Seiki Kabushiki Kaisha | Hydraulic pump |
US9784262B2 (en) | 2010-12-09 | 2017-10-10 | S.P.M. Flow Control, Inc. | Offset valve bore in a reciprocating pump |
US9989044B2 (en) | 2010-12-09 | 2018-06-05 | S.P.M. Flow Control, Inc. | Offset valve bore in a reciprocating pump |
USD706397S1 (en) | 2011-08-19 | 2014-06-03 | S.P.M. Flow Control, Inc. | Portion of fluid end |
US9945362B2 (en) | 2012-01-27 | 2018-04-17 | S.P.M. Flow Control, Inc. | Pump fluid end with integrated web portion |
US10330097B2 (en) | 2012-01-27 | 2019-06-25 | S.P.M. Flow Control, Inc. | Pump fluid end with integrated web portion |
USD706833S1 (en) | 2012-04-27 | 2014-06-10 | S.P.M. Flow Control, Inc. | Center portion of a fluid cylinder for a pump |
US10731654B2 (en) | 2015-11-06 | 2020-08-04 | Pierburg Gmbh | Coolant pump for an internal combustion engine |
Also Published As
Publication number | Publication date |
---|---|
ES2287759T3 (en) | 2007-12-16 |
DK1660776T3 (en) | 2007-10-08 |
ATE364138T1 (en) | 2007-06-15 |
EP1660776A1 (en) | 2006-05-31 |
ITMO20030224A1 (en) | 2005-02-01 |
CN1826471A (en) | 2006-08-30 |
CN100462563C (en) | 2009-02-18 |
EP1660776B1 (en) | 2007-06-06 |
ITMO20030224A0 (en) | 2003-07-31 |
DE602004006879D1 (en) | 2007-07-19 |
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