Materials Performance Supplements

Corrosion Management for Pipeline Integrity 2018

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

Issue link:

Contents of this Issue


Page 18 of 23

Be it general, f low-accelerated, microbiologically induced, ero- sion-corrosion, or of another form, internal corrosion of piping and pressure vessels is a significant issue across all industries. Often, ultrasonic thickness (UT) testing is completed manually with the only record of the examination being a report listing the nominal wall thickness and the minimum thickness measured. Adjacent areas that may have less overall wall loss from corrosion can poten- tially go undocumented. In other applications, UT testing may be completed using a relatively coarse grid over a large area, resulting in a sampling of thickness measurements that is far from a map of the actual internal topology of the pipe. APPLICATION NOTE INTERNAL CORROSION MAPPING In more critical applications and where higher resolution thickness data are required, automated ultrasonic thickness (AUT) testing sys- tems for thickness mapping are typically employed. These AUT map- ping solutions have the same inherent challenges as the AUT equip- ment used in other applications; the equipment can be complex and pose access limitations, they may require additional personnel to implement, and the inspection time and costs can be significant. Other encoding options that are simpler than fully automated sys- tems can require a significant amount of post-processing time to create composite topographical thickness maps. LATITUDE, coupled with the use of a PAUT corrosion mapping probe, enables the encoding of high-resolution thickness data while manu- ally manipulating the inspection probe, resulting in a composite thickness map that requires little to no post-processing for analysis. The figure to the right shows an example of a thickness map gener- ated using LATITUDE with a corrosion array probe on a section of service water piping with severe internal corrosion pitting. The scanned area shown is an ~10-in square, contains upwards of 30,000 discrete UT measurements, and was acquired in less than 2 minutes of scanning. Furthermore, the data files created using this approach can be imported into finite-element analysis (FEA) software to per- form engineering analyses of the component with wall loss. The advantages of the LATITUDE encoded corrosion mapping approach are as follows: n Provides high-resolution encoded thickness data using a manual inspection approach n Fully characterizes the internal surface condition of the component (i.e., no sparse sampling) n Digital thickness map can be used in FEA software to con- duct engineering analyses of the component n Requires fewer people and less hardware than traditional fully automated corrosion mapping solutions n Manual manipulation of the PAUT probe allows the opera- tor to ensure good coupling of the probe and optimize indi- cation responses on-the-fly n Portability and compactness allows quick setup and break- down when moving between inspection locations n B a tt e r y p ow e r e li m i n a t e s th e n e e d f o r a 1 2 0 V p ow e r s o u rc e Structural Integrity Associates, Inc. ® 19 CORROSION MANAGEMENT FOR PIPELINE INTEGRIT Y SUPPLEMENT TO MP MATERIALS PERFORMANCE JUNE 2018 Tel: +1 877-4SI-POWER Web site:

Articles in this issue

Links on this page

Archives of this issue

view archives of Materials Performance Supplements - Corrosion Management for Pipeline Integrity 2018