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10305 316 Stainless Steel Instrument Tubing in Marine Applications

Picture for 10305 316 Stainless Steel Instrument Tubing in Marine Applications
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Field experience was studied to identify the best solutions to Localized corrosion of 316 stainless steel instrument and chemical injection tubing in marine environment. Laboratory tests and exposure in marine environment of samples have been used to evaluate possible alternative materials and protective chemicals.

Product Number: 51300-10305-SG
ISBN: 10305 2010 CP
Author: Ardjan Kopliku and Conchita Mendez
Publication Date: 2010
Industries: Maritime , Corrosion Monitoring and Control
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$20.00
$20.00

Localized corrosion of 316 stainless steel instrument and chemical injection tubing in marine environment has been an old and widespread problem for the offshore operations in the oil and gas industry. To identify the best solutions to this problem field experience was studied, and laboratory tests and exposure in marine environment of samples have been used to evaluate possible alternative materials and protective chemicals. Testing was performed in a salt fog chamber with subsequent periods of one hour wet and one hour dry. 316L stainless steel tubing samples sprayed with six commercially available chemicals were used. Furthermore, UNS C69100, Alloy 625 (UNS N06625), 317LMN (UNS S31726), 6Mo stainless steel (UNS S31254), and Alloy 825 (UNS N08825) were also exposed in the same environment and conditions. In a second phase of the study, two racks, each containing samples of 316 stainless steel tubing sprayed with the above chemicals and samples of the materials listed above plus super duplex stainless steel and Alloy 400 (UNS N04400), were prepared. One rack was installed in an offshore platform in the Gulf of Mexico and the other in Trinidad. After one year exposure the samples were analyzed to evaluate their corrosion performance. The test results and the field exposure showed that protective chemicals are a viable method but only as a temporary solution. The different chemicals tested could be ranked based on their performance. This evaluation protocol was also effective for assessing the corrosion resistance and applicability of the different alloys tested.

Keywords: localized corrosion, stainless steel, marine corrosion, protective sprayed coatings, cyclic salt fog, field exposure

Localized corrosion of 316 stainless steel instrument and chemical injection tubing in marine environment has been an old and widespread problem for the offshore operations in the oil and gas industry. To identify the best solutions to this problem field experience was studied, and laboratory tests and exposure in marine environment of samples have been used to evaluate possible alternative materials and protective chemicals. Testing was performed in a salt fog chamber with subsequent periods of one hour wet and one hour dry. 316L stainless steel tubing samples sprayed with six commercially available chemicals were used. Furthermore, UNS C69100, Alloy 625 (UNS N06625), 317LMN (UNS S31726), 6Mo stainless steel (UNS S31254), and Alloy 825 (UNS N08825) were also exposed in the same environment and conditions. In a second phase of the study, two racks, each containing samples of 316 stainless steel tubing sprayed with the above chemicals and samples of the materials listed above plus super duplex stainless steel and Alloy 400 (UNS N04400), were prepared. One rack was installed in an offshore platform in the Gulf of Mexico and the other in Trinidad. After one year exposure the samples were analyzed to evaluate their corrosion performance. The test results and the field exposure showed that protective chemicals are a viable method but only as a temporary solution. The different chemicals tested could be ranked based on their performance. This evaluation protocol was also effective for assessing the corrosion resistance and applicability of the different alloys tested.

Keywords: localized corrosion, stainless steel, marine corrosion, protective sprayed coatings, cyclic salt fog, field exposure

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08254 External Pitting and Crevice Corrosion of 316L Stainless Steel Instrument Tubing in Marine Environments and Proposed Solution

Product Number: 51300-08254-SG
ISBN: 08254 2008 CP
Author: A. Okeremi and M. Simon-Thomas
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51318-10487-Evaluation of Coating Systems to Address Pitting Corrosion of 316 Stainless Steel for Offshore

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This study was to 1) develop a protocol to test coating performance on pitted stainless steel 2) compare performance of protective coating systems 3) determine application procedure.
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08174 Unusual Corrosion Failures of Stainless Steel in Low Chloride Waters

Product Number: 51300-08174-SG
ISBN: 08174 2008 CP
Author: Troels Mathiesen and Jan Elkjaer Frantsen
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Rare corrosion failures of stainless steel are reviewed in the paper. The cases originate from low chloride waters like potable water or fresh water in the temperature range of 15-25°C. Under such conditions full resistance of austenitic stainless steel like AISI 316 is usually expected.
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