US3351545A - Device for checking cathodic protection - Google Patents

Device for checking cathodic protection Download PDF

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Publication number
US3351545A
US3351545A US332633A US33263363A US3351545A US 3351545 A US3351545 A US 3351545A US 332633 A US332633 A US 332633A US 33263363 A US33263363 A US 33263363A US 3351545 A US3351545 A US 3351545A
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United States
Prior art keywords
potential
cathodic protection
relay
checking
counter
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Expired - Lifetime
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US332633A
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English (en)
Inventor
Heuze Bernard Marie Louis
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CONTRE LA CORROSION SOC ET
D'ETUDES CONTRE LA CORROSION Ste
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CONTRE LA CORROSION SOC ET
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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
    • C23F13/04—Controlling or regulating desired parameters

Definitions

  • the invention relates to a process and device for registering the number of times that the potential of a cathodic protection system of a structure exceeds the effective range of cathodic protection, and'also registers the total period during which this ineffective potential is produced.
  • variable stray currents may traverse these pipes and continually modify their potential in relation to the soil.
  • cathodic protection is only obtained on the basis of a well-defined potential threshold.
  • This potential threshold for example, for a steel pipe, would be 850 mv. relative to a standard reference copper or copper sulphate electrode located in contact with the soil in the immediate vicinity of the pipe. If the potential of the pipe falls below the abovementioned threshold or limit and becomes, for example, 1000 or -1500 mv., there is no disadvantage, since the cathodic protection of the steel pipe still remains effective. However, if, the potential rises above this limit and becomes, for example 500 or mv., the cathodic protection becomes nonexistent and there .is a risk of corrosion of the pipe, which corrosion generally increases and becomes more rapid, as the potential of the pipe uses.
  • the present invention has for an object to provide a m'onitoring and checking process and device which fulfil the same function as a continuous indicator of the potentialof the structure without possessing the same disadvantages. It allow for thesimplification and the spacing in time of the operation for checking cathodic protection, whilst affording increased certainty as to the total number of possible anomalies which occur during the period between two successive checks.
  • This process and this device are simple and moreover allow the checking to be more rapidly effected without it being necessary to use supplementary apparatus.
  • the checking device which is rigidly or permanently installed, registers the number of times that the potential of the structure being checked exceeds the effective zone or range-of cathodic protection, and also registers the total period "during which this potential was produced.
  • FIGURE 1 is a schematic representation of the device
  • FIGURE 2 is a schematic circuit diagram of the device shown in FIGURE 1.
  • the apparatus contained in a case 1 is connected externally, by means of wires to two terminals 8, to the structure 2 the potential of which it is desired to check, and to a reference electrode 3 respectively, preferably located in the vicinity of the structure 2 and in the same ambient environment.
  • the reference electrode may, for example, be of the type disclosed in French Patent 1,261,438, of Apr. 10, 1961.
  • a voltage sensitive relay namely a voltmeter relay 4
  • the signal produced by the voltmeter relay 4 causes the number indicated by a counter 5 to be advanced by one unit and also sets a clock 6 into operation.
  • the potential of the structure subsequently reaches a value such that cathodic protection of the structureis effected, i.e. when the difference in potential between the structure 2 and the reference electrode 3 is such that there is no corrosion of the structure 2
  • the signal emitted by the voltmeter relay 4. is stopped and this in turn stops the operation of the clock 6.
  • This clock 6 comprises a totaliser device which indicates the period during which it has functioned since initially starting.
  • a switch 7, forming part of the device allows the differ ent operations necessary for the control and adjustment of the device to be effected. For example, it successively allows:
  • the moving coil of the voltmeter relay to be sh0rtcir- I a) minals 9, of the voltage of the batteries incorporated in the device, to determine their condition,
  • the voltmeter relay in FIGURE 2 comprises a voltmeter having a moving coil and contacts 11 which are closed when the difierence in potential between the structure 2 and the reference electrodes 3 (FIGURE 1) reaches a value to which the relay is adjusted.
  • the closing of these contacts operates a counter 12 of known construction which counts another unit, and starts a clock 13, also of known construction.
  • the operation or triggering of the counter 12 is effected by a pulse of current produced by means of a capacitor 14 at the instant when the contacts 11 close in the circuit supplied by batteries 15.
  • the capacitor 14 is shunted by means of a resistor16 which allows the capacitor to discharge rapidly upon opening of the contacts 11, and thus enables the capacitor again to supply a new pulse to the counter 12.
  • the clock 13 is energised by means of the batteries and only operates during closure of the contacts 11, so that it indicates the duration of this closure.
  • the counter 12 and clock 13 consume very little electric current so that the batteries need be of small capacity.
  • batteries can be used such as are generally utilised for private telephone installations, such as 9 volts, 50 amp-hour batteries.
  • a potentiometer 17 allows the voltage of the batteries to be employed to check and regulate the voltmeter relay 10, by switching a multiple switch 18 to a suitable position.
  • voltmeter relay provided with a moving coil 10: internal resistance 20,000 ohms; contact adjustable between 0.5 and 1.5 volts counter 12: capable of indicating up to 9,999, and consuming instantaneously during the duration of each pulse one pulse of current of 300 ma.
  • capacitor 14 2,000 microfarads clock 13: power 10 ma. under 9 v.
  • potentiometer 17 1000 ohms multi-pole switch 18: 6 circuits, 4 positions.
  • the apparatus comprises for example va volt/hour meter of a known type, in addition to the apparatus described above.
  • the volt/hour meter is simply substituted for the clock of the apparatus.
  • a monitoring and recording device for the continuous checking of the efiectiveness of a cathodic protection system of a structure comprising a voltmeter relay capable of sensing, and operable by, the potential difference between a structure being protected and a reference electrode located in the vicinity of the structure, said device further including a counter, a time device and a battery connected in a first circuit controlled by said relay, said relay being adjusted to close the first circuit upon deviation of said potential beyond a predetermined value, solely for the duration of said deviation, to trigger the counter to count and record the number of deviations and to trigger the timing device to record the total duration of said deviations.
  • timing device comprises an electric clock connected in parallel with the counter.
  • a device as claimed in claim 4 including an input circuit by means of which the relay is connectable to said potential, said input circuit including a multi-position switch adapted to selectively and alternately connect the relay to said potential and to a potentiometer to which a voltage is applied by said cell.
  • a device as claimed in claim 1 including a volt/ hour meter integrator apparatus connected in said first circuit and adapted to be triggered by the closing of the first circuit, said apparatus comprising the timing device.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Prevention Of Electric Corrosion (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
US332633A 1962-12-22 1963-12-23 Device for checking cathodic protection Expired - Lifetime US3351545A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR919750A FR1356957A (fr) 1962-12-22 1962-12-22 Procédé et dispositif pour la surveillance continue des protections cathodiques

Publications (1)

Publication Number Publication Date
US3351545A true US3351545A (en) 1967-11-07

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US332633A Expired - Lifetime US3351545A (en) 1962-12-22 1963-12-23 Device for checking cathodic protection

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US (1) US3351545A (en))
BE (1) BE641717A (en))
DE (1) DE1521957B1 (en))
FR (1) FR1356957A (en))
GB (1) GB1062878A (en))
NL (1) NL302359A (en))

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2464310A1 (fr) * 1979-08-27 1981-03-06 Rheem International Detecteur d'appauvrissement d'anode, notamment pour chauffe-eau
US4409080A (en) * 1981-06-18 1983-10-11 Texaco Inc. System for monitoring a cathodically protected structure
US4826577A (en) * 1987-02-18 1989-05-02 Lange Goesta Control system for electrochemical protection on submersible metal structures

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2862177A (en) * 1955-02-28 1958-11-25 Yale W Titterington Apparatus for measuring the charge on buried conductors
US2918420A (en) * 1956-08-06 1959-12-22 Sabins Dohrmann Inc Electrolytic system
US2935679A (en) * 1956-09-11 1960-05-03 Western Electric Co Test set for measuring shunt delay times of telephone dials
US3061773A (en) * 1959-07-27 1962-10-30 Pure Oil Co Apparatus for cathodic protection
US3162585A (en) * 1960-04-12 1964-12-22 Mine Safety Appliances Co Continuous automatic coulometric titration system
US3247500A (en) * 1962-11-19 1966-04-19 Grazio Phillip De Cathodic protection alarm apparatus
US3266027A (en) * 1963-06-17 1966-08-09 Shell Oil Co Low-current alarm for cathodic protection units

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH336240A (de) * 1955-09-19 1959-02-15 Kuenzler Hans Verfahren und Schaltungsanordnung zum kathodischen Schutz metallischer Objekte
DE1141564B (de) * 1956-02-29 1962-12-20 Siemens Ag UEberwachungsvorrichtung fuer elektrische Schutzeinrichtungen an korrosionsgefaehrdeten Anlagen
US2947679A (en) * 1956-12-24 1960-08-02 Pure Oil Co Corrosion rate sensing assembly
GB859096A (en) * 1958-03-12 1961-01-18 Volkswerft Stralsund Veb Means for the cathodic protection of ships and the like
US3055813A (en) * 1958-11-17 1962-09-25 Pure Oil Co Current controller for use in cathodic protection of steel structures
FR1261438A (fr) * 1960-04-08 1961-05-19 Contre La Corrosion Soc Et Procédé et dispositif pour évaluer à poste fixe le potentiel des structures métalliques

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2862177A (en) * 1955-02-28 1958-11-25 Yale W Titterington Apparatus for measuring the charge on buried conductors
US2918420A (en) * 1956-08-06 1959-12-22 Sabins Dohrmann Inc Electrolytic system
US2935679A (en) * 1956-09-11 1960-05-03 Western Electric Co Test set for measuring shunt delay times of telephone dials
US3061773A (en) * 1959-07-27 1962-10-30 Pure Oil Co Apparatus for cathodic protection
US3162585A (en) * 1960-04-12 1964-12-22 Mine Safety Appliances Co Continuous automatic coulometric titration system
US3247500A (en) * 1962-11-19 1966-04-19 Grazio Phillip De Cathodic protection alarm apparatus
US3266027A (en) * 1963-06-17 1966-08-09 Shell Oil Co Low-current alarm for cathodic protection units

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2464310A1 (fr) * 1979-08-27 1981-03-06 Rheem International Detecteur d'appauvrissement d'anode, notamment pour chauffe-eau
US4306189A (en) * 1979-08-27 1981-12-15 Rheem Manufacturing Company Anode depletion detector
US4409080A (en) * 1981-06-18 1983-10-11 Texaco Inc. System for monitoring a cathodically protected structure
US4826577A (en) * 1987-02-18 1989-05-02 Lange Goesta Control system for electrochemical protection on submersible metal structures

Also Published As

Publication number Publication date
GB1062878A (en) 1967-03-22
FR1356957A (fr) 1964-04-03
BE641717A (en)) 1964-06-23
DE1521957B1 (de) 1969-12-11
NL302359A (en))

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