PRACTICAL APPLICATION OF THE INTERNAL CORROSION DIRECT ASSESSMENT PROCESS FOR NATURAL GAS PIPELINES

摘要

The Internal Corrosion Direct Assessment (ICDA) process has been developed to determine if rninternal corrosion is likely or unlikely to exist in a given length of pipe. The procedure is applicable to rnnatural gas pipeline systems which are considered to be dry and/or free of electrolyte under normal rnoperating conditions. An accurate determination of the most probable point where internal corrosion rnmight occur as a result of upset conditions combined with a calculation of the critical angle and a rnthorough assessment of that area for corrosion can be used to verify the likelihood of additional rncorrosion downstream of that site. It is essential to accumulate a true representation of the pipeline?s rnoperating conditions, both past and present, in order to accurately predict its corrosion tendencies. A rncase history is presented to demonstrate the benefits that can be realized by applying the ICDA process rnas opposed to more costly alternatives. If utilized properly, the ICDA process can be a significant rnaddition to an existing pipeline integrity management plan.