Materials Performance

JUN 2016

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.

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79 NACE INTERNATIONAL: VOL. 55, NO. 6 MATERIALS PERFORMANCE JUNE 2016 Your Association in Action future Jung Se Jung quarterly seminars. The OISD is concerned that there has not been enough monitoring in some of the neglected gas pipelines. He was concerned that the OISD-GDN-178 Management of Change protocol requiring the monitoring of changes being made to a program were not being monitored or assessed. Uprety expressed concern about the "negative" readings or the surprising "metal growth" readings associated with ER probes by many operators. In the opin- ion of the OISD, the ER mindset where many problems are being encountered has created misapplication of chemical injec- tion locations, chemical volumes, and less consideration for the need to assay solids found in India's pipelines. Uprety recom- mended always having the solids assayed. In closing, he said India's pipeline opera- tors must change their respective cultures from "bury and do not worry" to "bury and worry!" Mishra of Bharat Petroleum Corp., Ltd. (BPCL) presented his case study regarding internal corrosion and monitoring. He stated that 81% of facility failures are caused by internal corrosion. BPCL main- tains a log of corrosion-prone areas (CPAs) and does corrosion inhibitor screening using "spindle tests." He said fingerprint analyses of corrosion inhibitors are not being performed after being asked about consistency of corrosion inhibitor product quality. Mishra talked about BPCL's strategy of "capacity to capability" with respect to its line pipe and corrosion monitoring of CPAs. He also went on to talk about how pigging efficiency is measured by reduced friction factors and that cleaning pig runs every six months might be a reasonable target at this point but requires quantification. Victor of HPCL–Mumbai discussed the company's monitoring efforts using corrosion coupons. He conceded that HPCL could be doing more with their monitoring plans using ICPM and elec- tronic techniques. He questioned the continuous use of corrosion inhibitors for lines where minor to nil internal corrosion is suspected. Lastly, Chakraborty of GAIL–Noida, India talked about the recent advance- ments made in the preceding six months after a system-wide health assessment study was performed by GAIL for the 13,500-km pipeline infrastructure in early 2015. The system-wide audit was con- ducted following the unfortunate gas pipeline explosion in June 2014 at Tati-Paka in the KG Basin of southeast India. Chakraborty stated that GAIL has adopted a four-pronged strategy to address internal pipeline corrosion: 8 Policy and Procedures 8 Prevention 8 Monitoring and Analysis 8 Mitigative Actions He went on to state that GAIL had cre- ated 10 Remote Integrity Management Groups (RIMGs) in association with the Noida-based Central Integrity Manage- ment Group (CIMG), which had grown from about a dozen staff to more than 40 personnel by February 2016. He stated that in the ensuing six months, GAIL had installed some five dehydrators with sev- eral more on order to be installed throughout 2016. Special consideration for high-density polyethylene pipe and line pipe exposed to H 2 S includes the use of thicker materials. He said the annual clean pigging had been accelerated to weekly. This practice has had a positive impact throughout the GAIL KG Basin by the observation of reduced solids yields being recovered at these field operations. The change in pigging frequency and the addi- tion of dehydrators in the KG basin has seen the level of solids diminish to practi- cally zero. This is indicative of a much reduced internal corrosion problem that is now being managed more responsibly. With the collection of solids and in concert with the OISD concerns regarding solids assays, GAIL has now acquired its own x-ray diffraction tool and is building a new corrosion lab with appropriate testing capabilities. Associated with these quality control improvements, GAIL will be intro- ducing monitoring actions including gas quality, thickness corrosion monitoring using nondestructive examination, and conventional internal corrosion monitor- ing, including the CorrOcean FSM (field signature method). Improvements were also being made with the acquisition of the ArcGIS pipeline mapping system. This is to be done annually on every pipeline. Lastly, Chakraborty stated that over the next four to six years they intend to create a center of excellence by the devel- opment of its own in-house SMEs under the close mentorship of SMEs such as Teevens and Palacios. Queries Raised by Attendees A few of the queries discussed during the interactive forum are listed below : The topic of electronic corrosion probes was raised several times regarding the use of ER, linear polarization resis- tance (LPR), and electrochemical noise EN. There appeared to be "scripted" justifi- cations for the use of ER and non-scientific Continued on page 80

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