Internal Corrosion has been always a great challenge in many process industries. Corrosion monitoring and mitigations are vital in most of the industries especially in the Oil and Gas productions. On line Corrosion monitoring (OCM) techniques have been extensively used to monitor internal corrosion of the coupons installed in the process equipment in order to assess the corrosivity of the fluids and monitor the internal corrosion of the equipment. OCM coupon corrosion/pitting rates provide the inputs for conducting the Nondestructive testing (NDT) of the equipment to verify actual thickness reductions due to corrosion in order to prevent any failure.

A case study was conducted for this paper at one of the gathering centers (GC) of Kuwait Oil Company. Very severe general corrosion/pitting rates were shown by OCM points and after the verification by using long range ultrasonic thickness (LRUT) testing, it was found that severe thickness reductions had occurred on the piping. Detailed investigations were carried out on the failed pipe sections to determine the cause of corrosion and establish proper recommendations for mitigation measures.

This paper highlights the benefits of OCM techniques, co-relation of OCM corrosion/pitting rates, replacement of piping prior to failure and corrosion investigations of the piping which was mostly due to the heavy deposits and under deposits microbiological influenced corrosion (MIC).

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