Corrosion Monitoring


In collaboration with our principals M/s. Metal Samples Inc. USA we offer a range of Corrosion Monitoring Instruments. Metal Samples are the world leaders in Corrosion Monitoring Instrumentation and test services.

The range of products include:

  • Corrosion Test Coupons
  • Corrosion Monitoring Probes and Instruments - ER and LPR
  • Specialized Probes - Bio Probes, Sand Probes and Hydrogen Probes.
  • Online Monitoring and Insitu services.

 

 

 

 

ONLINE CORROSION MONITORING

Practice of measuring the corrosivity of proces stream conditions by the use of probes which are inserted in the process stream and which are continuously exposed to the process stream conditions. Corrosion monitoring probes can be mechanical, electrical, or electromechanical devices.

NEED FOR CORROSION MONITORING:

  • By providing early warnings
  • By studying the correlation of changes in process parameters to its corrosivity.
  • By diagnosing particular corrosion problem
  • By evaluating the effectiveness of corrosion control/prevention method.
  • By providing management information relating to the maintanence requirements
    and ongoing condition of plant.

APPLICATION OF CORROSION MONITORING TECHNIQUES:

  • Where risks are very high
  • Where process upsets can cause high corrosivity
  • Where corrosion inhibitors are in use
  • Where process feedstock is changes
  • In the evaluation of corrosion behaviour of various alloys.
  • Where product contamination due to corrosion is a vital concern.

APPLICATION IN INDUSTRIES

  • OIL/GAS PRODUCTION
  • REFINING
  • PULP AND PAPER INDUSTRY
  • PERTOCHEMICALS
  • CHEMICALS
  • PROCESSING
  • COOLING SYSTEMS
  • EFFLUENT SYSTEMS
  • MAKE UP WATER SYSTEMS
  • BOILER WATER SYSTEM

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ER MONITORING

Electrical resistance technique is one of the methods of OnLine Monitoring of the corrosion phenomena. It measures the rate of corrosion and the extent of metal loss for any metallic equipment or structure. The E/R Monitoring system consists of a sensitive probe element (Composition of the element being similar to the process system of interest) connected to an electronic instrument. The system measures the change in the electrical resistance of the probe element as the metal loss occurs. The rate of change is directly proportional to the corrosion rate.

ER probes are available in a variety of element geometries, metallurgies and sensitiveness.

ER probes have all advantages of coupons plus:

  • They are applicable to all working environments gases, liquids, solids, particulate flows.
  • Direct measurement of rate of corrosion.
  • Respond quickly to corrosion upsets.

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LPR MONITORING

Linear Polarization resistance technique is one of the methods of online monitoring of the corrosion phenomena.

The principle of linear polarization resistance may be briefly stated as follows:

Immersion of an alloy/metal electrode in an electrolytically conducting medium of sufficient oxidizing power will lead to corrosion of the electrodes by electrochemical mechanism. The rate of corrosion is proportional to the gradient of the corrosion potential vs current curve.

The LPR monitoring system consists of sensitive probe element (composition of the element being similar to the processing system of interest) connected to an electronic instrument.

In practice a low amplitude voltage is applied across the electrodes and the resulting current is measured which is correlated to the corrosion rate.

In fundamental terms, corrosion rate of a probe is inversely proportional to polarization resistance.

Advantage of LPR Monitoring technique:

  • Real time instantaneous measurement of corrosion rate.
  • Faster identification of corrosion upsets.

Limitations:

Limited to applications in electrolytically conducting environment.

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Services - Integrated Corrosion Management Division