Materials Performance

NOV 2012

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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EDITORIAL DIRECTOR, PUBLICATIONS MANAGING EDITOR Gretchen A. Jacobson TECHNICAL EDITOR John H. Fitzgerald III, FNACE ASSOCIATE EDITOR Kathy Riggs Larsen EDITORIAL ASSISTANT Suzanne Moreno CONTRIBUTOR Husna Miskinyar GRAPHICS ELECTRONIC PUBLISHING COORDINATOR Teri J. Gilley GRAPHICS DESIGNER E. Michele Sandusky ADMINISTRATION NACE EXECUTIVE DIRECTOR Robert (Bob) H. Chalker ADVERTISING SALES MANAGER Tracy Sargent ACCOUNT EXECUTIVES Jody Bradel Diane Gross Jody Lovsness Raleigh Whitehead Leslie Whiteman ADVERTISING/BOOKS COORDINATOR Brenda Nitz REGIONAL ADVERTISING SALES REPRESENTATIVES The Kingwill Co. Chicago/Cleveland/New York Area– +1 847-537-9196 NACE International Contact Information Phone: +1 281-228-6200 Fax: +1 281-228-6300 E-mail: Firstservice@nace.org Web Site: www.nace.org EDITORIAL ADVISORY BOARD John P. Broomfield Broomfield Consultants Raul A. Castillo Consultant Irvin Cotton Arthur Freedman Associates, Inc. Arthur J. Freedman Arthur Freedman Associates, Inc. Orin Hollander Holland Technologies W. Brian Holtsbaum DNV Russ Kane iCorrosion, LLC Kurt Lawson Mears Group, Inc. Lee Machemer Jonas, Inc. Ernest Klechka CITGO Petroleum Corp. Norman J. Moriber Mears Group, Inc. John S. Smart III Packer Engineering L.D. "Lou" Vincent L.D. "Lou" Vincent PhD LLC NACE International, Vol. 51, No. 11 The MP Blog Experiences and opinions from readers on corrosion issues Errata and apologia The review of coating performance in Duluth Superior Harbor—Part 1 and Part 2 in Materials Performance September 2012 and October 2012 was based on in- formation provided to the authors. At the time of publication of Part 1 we learned WN I UQ[\ISM QV \PM QLMV\QÅKI\QWV WN WVM of the coatings. The correct manufacturer for the coating on I-beam samples 7 and 16 was Poly-Spec and the product was LPE 5100. The coating that was listed failed in laboratory testing and was not included in field trials. Descriptions (except color) of coatings on samples 3 and 12 and 8 and 17 were reversed. Nei- \PMZ KWI\QVO NIQTML QV \PM ÅMTL \ZQIT[ 6 million L). Upon de watering procedures, it was NW]VL \PI\ \PM PaLZWOMV []TÅLM 02 S) gas ahead of the pig was much higher than expected. This excess amount of the gas was attributed to microbial activities of sulfate-reducing bacteria (SRB) and upon application of a cocktail of chemicals that also contained H2 S scavengers and SRB- [XMKQÅK JQWKQLM[ []KP I[ \M\ZISQ[ PaLZW`a- methyl phosphonium sulfate (THPS), the problem was under control. Methods such as adenosine phosphosulfate (APS) reductase assessment and serial dilution were applied to prove the existence and change in the numbers of SRB. However, I think I can't agree with the authors' philosophy in explaining the root cause of the problem. Claiming that SRB were the main source of producing too much H2 S does not seem right to me My understand- because of the following points: 1) The MP article discusses entering "oxygenated" seawater into the line segment. I have shown elsewhere4 when it comes to stagnant water conditions, either during hydrostatic testing or within a hydrant system, one possible scenario could be that due to the water becoming deoxy- genated over time, the conditions become suitable for the SRB to retrieve. Given the large volumes of the water involved and relatively short time (45 days) of becoming stagnant, and also knowing that to let SRB (especially in the planktonic Continued on page 10 November 2012 MATERIALS PERFORMANCE 9

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