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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