EP1660776A1 - Galvanic corrosion protection apparatus for a pump - Google Patents

Galvanic corrosion protection apparatus for a pump

Info

Publication number
EP1660776A1
EP1660776A1 EP04763633A EP04763633A EP1660776A1 EP 1660776 A1 EP1660776 A1 EP 1660776A1 EP 04763633 A EP04763633 A EP 04763633A EP 04763633 A EP04763633 A EP 04763633A EP 1660776 A1 EP1660776 A1 EP 1660776A1
Authority
EP
European Patent Office
Prior art keywords
pump
sacrificial anode
pumping
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.)
Granted
Application number
EP04763633A
Other languages
German (de)
French (fr)
Other versions
EP1660776B1 (en
Inventor
Antonio Gambigliani Zoccoli
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.)
Caprari SpA
Original Assignee
Caprari SpA
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 Caprari SpA filed Critical Caprari SpA
Publication of EP1660776A1 publication Critical patent/EP1660776A1/en
Application granted granted Critical
Publication of EP1660776B1 publication Critical patent/EP1660776B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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 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.
  • 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.
  • 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.
  • 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 for a pump, comprising sacrificial anode means electrically associateable with pumping means of said pump, characterised in that said sacrificial anode means comprises a portion configured in such a way as to interact with a flow of fluid pumped by said pumping means .
  • 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 further portion leads away that is arranged to be tightened between said pumping means and motor means operationally associateable with the pumping means. In this way, it is not necessary to provide fixing elements made of more noble metals than those that constitute the sacrificial anode means.
  • a pump comprising pumping means of a fluid and galvanic protection means arranged to protect said pumping means against corrosion, said galvanic protection means comprising sacrificial anode means electrically coupled with said pumping means, characterised in that said sacrificial anode means is arranged in direct contact with said pumping means.
  • the dispersion of the currents is therefore concentrated at the sacrificial anode means.
  • 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 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
  • 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 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.

Abstract

A pump comprises pumping means (1) of a fluid and galvanic protection means (3, 4) arranged to protect against corrosion said pumping means (1), said galvanic protection means (3) comprising sacrificial anode means (4) arranged in direct contact with said pumping means(1) and electrically coupled with said pumping means (1); a galvanic protection apparatus for a pump (10) comprises sacrificial anode means (4) electrically associateable with pumping means (1) of said pump (10), said sacrificial anode means (4) comprising a portion (6) configured in such a way as to interact with a flow of fluid pumped by said pumping means (1).

Description

Galvanic corrosion protection apparatus
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.
In general, 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. For example, 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.
Owing to the lower electrochemical potential, the oxidation and dissolution of the sacrificial anode rather than the apparatus to be protected are encouraged.
In other words, 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.
In these pumps, 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.
One drawback of the protection system disclosed above consists of the fact that as the galvanic current has to pass through the motor to pass from the pump to the sacrificial anode, it encounters strong electric resistance.
This means that part of the current, being unable to reach the sacrificial anode, is dissipated at the pump, which is thus subjected to not insignificant corrosion phenomena. Another drawback of the protection system disclosed above consists of the fact that it enables protection having limited duration over time to be achieved.
On the surface of the sacrificial anode, in fact, following the reaction of the metal material that constitutes it with oxygen present within the fluid with which the sacrificial anode is brought into contact, a layer of oxide forms on the sacrificial anode that protects the innermost layers, thereby preventing its further corrosion.
This phenomenon is more pronounced in the presence of minor dispersed currents.
In such cases the well-known phenomenon of passivation occurs.
In this way, as the sacrificial anode is protected by the layer of oxide, 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.
This enables corrosion phenomena on the sacrificial anode to be located, thereby preventing corrosion from affecting the fixing elements and thus preventing an effective connection between the sacrificial anode and the motor.
This involves a considerable cost in prior-art sacrificial anodes, due to the cost of the fixing elements in noble metals. 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.
In a first aspect of the invention a galvanic protection apparatus is provided for a pump, comprising sacrificial anode means electrically associateable with pumping means of said pump, characterised in that said sacrificial anode means comprises a portion configured in such a way as to interact with a flow of fluid pumped by said pumping means .
Owing to this aspect of the invention, 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.
This ensures that the dispersion of electric current always occurs at the sacrificial anode, which in this way performs the desired protective function with regard to the pumping means.
The result is that the galvanic protection apparatus is effective for rather a long time, namely until the sacrificial anode has completely dissolved.
In one embodiment, from said portion a further portion leads away that is arranged to be tightened between said pumping means and motor means operationally associateable with the pumping means. In this way, it is not necessary to provide fixing elements made of more noble metals than those that constitute the sacrificial anode means.
This enables the cost of the sacrificial anode means to be limited.
In a second aspect of the invention, a pump is provided comprising pumping means of a fluid and galvanic protection means arranged to protect said pumping means against corrosion, said galvanic protection means comprising sacrificial anode means electrically coupled with said pumping means, characterised in that said sacrificial anode means is arranged in direct contact with said pumping means.
Owing to this aspect of the invention, it is possible to obtain a pump equipped with an effective system of protection against corrosion.
In fact, as the sacrificial anode means is placed in direct contact with pumping means, galvanic currents present in the pumping means encounter low resistance during the passage to the sacrificial anode means.
The dispersion of the currents is therefore concentrated at the sacrificial anode means.
As a result the pumping means is effectively protected against electrochemical corrosion.
The invention will be better understood and implemented with reference to the attached drawings, which illustrate an embodiment by way of non-limiting example, in which:
Figure 1 is a schematic side view of a pump according to the invention;
Figure. 2 is an enlarged and partially sectioned detail of Figure 1. In the attached Figures, 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.
Owing to the lesser electrochemical potential, 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.
As shown in Figure 2, 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.
At one end 12 of the support element 11 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.
In use, when the pump 1 is fixed to the motor 2 by usual fixing elements such as screws or stud bolts, the fixture portion 5 is tightened between the pump 1 and the motor 2.
This enables the sacrificial anode 4 to. be solidly connected to the pumping device 10.
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.
In this way it is no longer necessary to provide 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.
In this way, 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.
As the active portion 6 is subjected to the abrasive action of the fluid flow, 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.
In this way, by avoiding the accumulation of the oxide on the end surface 7 and on the side surface 18 of the active portion 6, 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.
As a result, 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
CLAIMS Pump comprising pumping means (1) of a fluid and galvanic protection means (3, 4) arranged to protect said pumping means (1) against corrosion, said galvanic protection means (3) comprising sacrificial anode means (4) electrically coupled with said pumping means
(1) , characterised in that said sacrificial anode' means (4) is arranged in direct contact with said pumping means (1) .
Pump according to claim 1, wherein said sacrificial anode means (4) comprises a portion
(6) configured in such a way as to interact with a flow of said fluid pumped by said pumping means (1) . Pump according to claim 2, wherein said portion
(6) comprises a pair of surfaces (7, 18) exposed to the flow that are arranged substantially perpendicularly to one another.
Pump according to any preceding claim, and furthermore comprising motor means (2) arranged to actuate said pumping means (1) .
Pump according to claim 4, wherein said sacrificial anode means (4) is arranged in direct contact with said motor means (2) .
Pump according to any of claims 1 to 5, wherein said sacrificial anode means (4) comprises a further portion (5) arranged to enable the fixing of said sacrificial anode means (4) to said pumping means (1) .
Pump according to claim β when appended to claim
2, or 3, or claim 4, or 5 appended to claim 2, or 3, wherein said . portion (6) has a transverse dimension less than said further portion (5) .
8. Pump according to claim 6, or 7, wherein said pumping means (1) comprises seat means (13) arranged to receive said further portion (5) .
9. Pump according to claim 8, wherein said seat means (13) is configured in such a way as to insulate said further portion (5) from said flow.
10. Pump according to any preceding claim, and furthermore comprising a support body (11) in a side wall of which opening means is obtained (19) arranged to enable said flow to reach said pumping means (1) advancing substantially radially in relation to said pumping means (1) .
11. Galvanic protection apparatus for a pump (10), comprising sacrificial anode means (4) electrically associateable with pumping- means (1) of said pump (10) , characterised in that said sacrifi-cial anode means (4) comprises a portion (β) configured in such a way as to interact with a flow of fluid pumped by said pumping means (1) .
12. Apparatus according to claim 11, wherein said portion (6) comprises a pair of surfaces (7, 18) exposed to the flow that are arranged substantially perpendicularly to one another.
13. Apparatus according to claim 11, or 12, wherein said sacrificial anode means (4) furthermore comprises a further portion (5) arranged to be tightened between said pumping means (1) and motor means (2) of said pump (10) arranged to actuate said pumping means (1) .
14. Apparatus according to claim 13, wherein said further portion (5) is arranged to be received in cavity means (15) defined by said pumping means (1) and by said motor means (2), in such a way as to be substantially insulated from said fluid flow.
15. Apparatus according to claim 13, or 14, wherein said portion (6) has a transverse dimension less than said further portion (5) .
EP04763633A 2003-07-31 2004-07-29 Galvanic corrosion protection apparatus for a pump Active EP1660776B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000224A ITMO20030224A1 (en) 2003-07-31 2003-07-31 CORALSION GALVANIC PROTECTION SYSTEM.
PCT/EP2004/008543 WO2005015024A1 (en) 2003-07-31 2004-07-29 Galvanic corrosion protection apparatus for a pump

Publications (2)

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

Family

ID=30012824

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04763633A Active EP1660776B1 (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)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4567081B2 (en) * 2008-09-29 2010-10-20 株式会社豊田中央研究所 Fluid pump
UA109682C2 (en) 2010-12-09 2015-09-25 PUMP PUMP PLACED PIPE
USD687125S1 (en) 2011-08-19 2013-07-30 S.P.M. Flow Control, Inc. Fluid end
CN106150953B (en) 2012-02-01 2018-10-19 S.P.M.流量控制股份有限公司 Pump fluid end with integrated web part
USD679292S1 (en) 2012-04-27 2013-04-02 S.P.M. Flow Control, Inc. Center portion of fluid cylinder for pump
DE102013225827A1 (en) * 2013-12-13 2015-06-18 Em-Motive Gmbh Electric machine unit with corrosion protection by sacrificial anode
DE102015119095B4 (en) 2015-11-06 2019-03-21 Pierburg Gmbh Coolant pump for an internal combustion engine

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 (en) * 1997-07-16 2002-10-21 株式会社荏原製作所 Corrosion / corrosion analysis method
NO307096B1 (en) * 1997-11-17 2000-02-07 Aker Offshore Partner As Corrosion-protected metal construction, for example in the form of a pipeline which may be part of a stronger pipe system
JP2000111510A (en) * 1998-09-30 2000-04-21 Ebara Corp Analytical method for corrosion and corrosion prevention

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005015024A1 *

Also Published As

Publication number Publication date
DK1660776T3 (en) 2007-10-08
DE602004006879D1 (en) 2007-07-19
CN1826471A (en) 2006-08-30
WO2005015024A1 (en) 2005-02-17
ATE364138T1 (en) 2007-06-15
CN100462563C (en) 2009-02-18
ITMO20030224A0 (en) 2003-07-31
ITMO20030224A1 (en) 2005-02-01
EP1660776B1 (en) 2007-06-06
ES2287759T3 (en) 2007-12-16

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