Corrosion protection of flanges and valves

• E. Lyublinski¹, Ye. Vaks¹, G. Begunova², E. Kopilova³, M. Schultz⁴ and R. Singh⁵

¹ Northern Technologies International Corporation, 23205 Mercantile Rd., Beachwood, OH 44122, USA
² Astrakhan Gas Processing Plant, Astrakhan, Lenin St. 30, 414000 Russian Federation
³ VPK Engineering, Saint Petersburg, Tuchkov Per. 3, 199053 Russian Federation
⁴ Petrobras, República do Chile Av., Nr. 65, Rio de Janeiro – RJ, CEP: 20031-912, Brazil
⁵ ZERUST, Brazil, 1424 João Wagner Wey St. House 17, Sorocaba – SP, Brazil 18046-695

Abstract: Corrosion of pipeline flanges and valves is a major worldwide problem. These pipeline connections are highly susceptible to pitting and crevice corrosion, which is the primary cause of pipeline failure. Often, to reduce or eliminate the risk of leaks and the resultant problems (fire, explosions, environmental contamination, etc.), pipelines are taken out of operation. Many effective corrosion protection solutions exist, but none are universally applicable due to application limitations and/or cost. Over the last 10 years, we have developed different types of covers/systems that, when applied, provide efficient corrosion protection. This paper presents field trial test results over a one year period in a very harsh environment – at temperatures from –30 to +40°C and relative humidity higher than 50%. The new data demonstrates a high level of corrosion protection efficiency that allows to expand areas of flange savers application. This is an alternative, low-cost method which uses volatile corrosion inhibitors (VCI) to protect flanges, valves and welded joints from corrosion.

Keywords: corrosion, protection, inhibitor, efficiency, risk, flanges, valves

Int. J. Corros. Scale Inhib., 2014, 3, no. 4, 279–285 PDF (1 325 K)
doi: 10.17675/2305-6894-2014-3-4-279-285

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