Jacobs Engineering Chooses FiberSystems for Composite Off-Shore Platform Break Tank Application
멕시코 만에 정박해있는 세계에서 가장 깊은 석유시추/채굴 플랫폼 “Perdido”의 급수시스템 개조를 담당하고 있는 Jacobs 엔지니어링은 복합재 전문기업으로 FRP Vessel 설계/제작능력을 갖추고 있는 FiberSystems 사에 도움을 요청하였다. 여덟개의 스터브(Stub)와 플랜지를 가진 탱크의 주 몸체는 회색의 고성능 Methacrylate에폭시 수지를 이용하여 유리섬유를 필라멘트 와인딩 공정으로 작업하고 탱크의 윗부분과 아랫부분의 돔 형상 부품은 수작업으로 제작하여 접착제를 이용하여 탱크 몸체와 접착하였다. 내부 인테리어 추가 적층 후 입구 노출부는 레진 왁스 코팅을 사용하여 밀봉 처리하여 무게 1000 파운드, 길이는 11피트 8인치에 30인치 내경을 가진 탱크가 만들어졌다.
When Shell Exploration & Production subcontractor Jacobs Engineering was tasked to make modifications to a potable water system aboard Perdido, changes included a requirement for a positive break tank.
FiberSystems explains that, moored in the Gulf of Mexico, Perdido is the world’s deepest offshore oil drilling and production platform. Specifications for the tank, which allows trapped gases in the service line to escape through atmospheric vents while letting seawater pass through to water-makers to be turned into drinking water, called for material that iscorrosion resistant, light weight and low maintenance.
FiberSystems say that Jacobs approached it, “FiberSystems was the only company we could find that was capable of designing and fabricating the FRP vessel,” says Jesse LeBoeuf, a Mechanical Engineer for Jacobs. “The alternatives we considered were heavier, more costly and more difficult to maintain; issues that are problematic for offshore platforms.”
FiberSystems was given a preliminary CAD drawing and 12 to 14 weeks to design, fabricate and ship the tank. “It was a concept we hadn’t seen before,” says the FRP manufacturer’s Production Supervisor Dave Orr. “One of the problems we had to solve was how to anchor a free standing pipe on the inside of the tank. Fabricating the tank’s cradle and determining the best method for adhering the top dome to the main body of the tank was also challenging. Unlike a commodity shop though, we’re accustomed to taking on unique projects like this one. It’s one of our core strengths.”
FiberSystems filament wound the main body of the tank along with eight stubs and flanges using a high-performance grade of methacrylate epoxy resin pigmented gray. Holes were pre-drilled and cut. “We used 113 yield fibreglass because we wanted to build tank walls up quickly, twice as fast as the thickest glass,” notes Orr. The tank’s flat base and cradle were also filament wound. A hand lay-up process was used to fabricate the tank’s upper and lower domes which were bonded to the tank with adhesive. “We then butt welded and wrapped the joints for added strength,” says Orr. Interior layups, the free standing pipe inside the tank and the exposed openings were sealed with a resin wax coating. Weighing 1000 pounds, the tank measured 11 feet, 8 inches tall with a 30-inch inside diameter.