objective of intrusive corrosion monitoring is to obtain the best possible
data that will help mitigate corrosion related losses. Typically there
are two reasons to instigate corrosion monitoring:
A problem has occurred
and monitoring is used to troubleshoot or verify that the problem
has been resolved
potential problems and monitor for activity
is recommendable to be proactive and initiate monitoring before
problems occur. Monitoring allows the establishment of a corrosion
rate baseline upon which future operations can be compared and aids
in system life span forecasting. It will assist in pointing out
problem areas or trends before a failure occurs, and also proves
due diligence in protecting assets, safety and the environment.
industry experience, corrosion cause and effects are now much better
understood than before. Since we know qualitatively in what phase
and under what conditions corrosion takes place, the focus should
be on establishing the severity of the attack. In order to obtain
that knowledge we must monitor the system on-stream or by inspection
during shutdown. Having determined the severity of the attack, preventative
measures are taken, which in turn must be monitored to determine
the effectiveness of the measures. For example, monitoring can greatly
aid in the decision to use, or optimize the use of, chemical inhibitors.
Factors to Monitoring
multiple methods to evaluate (coupons, probes, bacterial)
of results is critical – do the results make sense?
monitoring to formulate a plan of action and help focus inspection program
data is used to make prevention decisions, it is critical to regularly
monitor a comprehensive cross-section of the facilities, ensure that the
data is reliable and evaluate worst possible conditions/cases. Using a
company with reliable equipment, responsive service technicians and a
lab facility dedicated to corrosion coupon analysis will provide facility
owners with the best information possible.