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97420 EXPERIENCES WITH THE SEAWATER SYSTEMS ON DRAUGEN - AFTER THREE YEARS IN PRODUCTION

Picture for 97420 EXPERIENCES WITH THE SEAWATER
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Product Number: 51300-97420-SG
ISBN: 97420 1997 CP
Author: Eli Ommedal, Roy Johnsen, Ivar Helge Hollen
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The Draugen field has been in operation for 3 years and a lot of experience has been gained during the period within the field of material - and corrosion engineering. The Draugen production plant is designed according to traditional material philosophy, by use of a combination of carbon steel and stainless steels. High alloyed 6 Mo austenitic stainless steel (UNS S31254) was selected for the chlorinated seawater system, in combination with 70/30 copper-nickel (UNS C71500) in the tirewater system. Corrosion on high alloyed stainless steels has been an increasing problem during the recent years. Several operators have experienced corrosion problems on seawater systems where high alloyed 6 Mo stainless steels have been applied. One of the reasons for these problems have been limited practical experience with the material in the actual media. Only results from laboratory tests were available at the time the design philosophy was implemented for application. Additionally, the process parameters (i.e. temperature) are often vulnerable to variations and materals with narrow area of application are not cost efficient alternatives. Experiences have shown that the high alloyed 6 Mo austenitic stainless steels with a previously defined upper temperature limit of 30 °C(86 °F), now is recommended at temperatures below 15 °C (58 °F).
The Draugen field has been in operation for 3 years and a lot of experience has been gained during the period within the field of material - and corrosion engineering. The Draugen production plant is designed according to traditional material philosophy, by use of a combination of carbon steel and stainless steels. High alloyed 6 Mo austenitic stainless steel (UNS S31254) was selected for the chlorinated seawater system, in combination with 70/30 copper-nickel (UNS C71500) in the tirewater system. Corrosion on high alloyed stainless steels has been an increasing problem during the recent years. Several operators have experienced corrosion problems on seawater systems where high alloyed 6 Mo stainless steels have been applied. One of the reasons for these problems have been limited practical experience with the material in the actual media. Only results from laboratory tests were available at the time the design philosophy was implemented for application. Additionally, the process parameters (i.e. temperature) are often vulnerable to variations and materals with narrow area of application are not cost efficient alternatives. Experiences have shown that the high alloyed 6 Mo austenitic stainless steels with a previously defined upper temperature limit of 30 °C(86 °F), now is recommended at temperatures below 15 °C (58 °F).
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