TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractIn deepwater, corrosion protection of flowlines is becoming a major issue as fluid (production or injection) aggressiveness, temperature and pressure increase. Conventional corrosion allowance of carbon steel flowlines leads to excessive procurement costs, installation weight and welding thickness resulting in non economic solutions. Clad flowlines present excellent corrosion protection, but the implementation of this technology results in quite expensive solutions with additional NDT difficulties during installation.An interesting alternative to achieve an acceptable corrosion protection in most conditions is the use of plastic liners. However, plastic lining has been mostly limited up to now to reel lay. Transposing as such this technology to J-lay results in a complex quad joint design inducing more welding and NDT difficulties at every offshore joint. Therefore, the use of this attractive technology in J-lay implies the development of a specific field joint design. SAIPEM SA has developed and patented an innovative and cost effective field-joint system (the Inconel Field Joint). This system maintains the corrosion barrier across girth weld locations along the flowline. This technology has minimal impact on the offshore laying rate due to performing standard steel to steel welds. It is associated to an integrated lining solution including all piping accessories by rotolining. This paper presents the main characteristics of the IFJ system for a typical deepwater water injection application and discusses the results of the extensive qualification program carried out over the last two years, including swage lining, machining, sleeve insertion, leak test and welding tests.
Summary In deepwater, corrosion protection of flowlines is becoming a major issue as fluid (production or injection) aggressiveness, temperature, and pressure increase. Conventional corrosion allowance of carbon steel flowlines leads to excessive procurement costs, installation weight, and welding thickness, resulting in noneconomical solutions. Clad flowlines present excellent corrosion protection, but the implementation of this technology results in quite expensive solutions with additional NDT difficulties during installation. An interesting alternative to achieve an acceptable corrosion protection in most conditions is the use of plastic liners. However, plastic lining has been mostly limited up to now to reel lay. Transposing this technology to J-lay results in a complex quad joint design, inducing more welding and NDT difficulties at every offshore joint. Therefore, the use of this attractive technology in J-lay implies the development of a specific field joint design. SAIPEM has developed and patented an innovative and cost effective field-joint system (the Inconel Field Joint). This system maintains the corrosion barrier across girth weld locations along the flowline. This technology has minimal impact on the offshore laying rate because of performing standard steel to steel welds. It is associated with an integrated lining solution including all piping accessories by rotolining. This paper presents the main characteristics of the IFJ system for a typical deepwater water injection application, and discusses the results of the extensive qualification program carried out over the last 2 years, including swage lining, machining, sleeve insertion, leak test, and welding tests.
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