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10305 316 Stainless Steel Instrument Tubing in Marine Applications

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
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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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