PRODUCTION • PROCESSING • HANDLING
API 674 pump designs, for injection rates of 12,000 l/h
within a temporary scaffolding enclosure outside the building; adding a further dimension to the exhaustive health & safety procedures the company adheres to. Tyco’s vigilance in this area helped COSCO achieve the milestone of completing over two million man hours on the project without any time loss incidents. Tyco called on two of its most trusted
partners to assist in the construction process, with a local company fabricating the methanol package, which included a 60,000 litre pressure vessel to be mounted on the largest of the skids to contain the methanol.Te idea behind this unusually high capacity is to greatly reduce the number of supply replenishments the FPSO will require during its time in the Western Isles. Tis will offer corresponding cost savings by reducing the number visits to the FPSO to replenish the methanol and potentially prevent interruptions to the work if adverse weather prevents supply vessels reaching the fields.
FOUR SMALLER SKIDS
Te chemical injection package comprised of the four smaller skids, which are
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The FPSO will be owned by Dana and Cieco and Dana will operate the subsea facilities and pipelines. Oil will be exported via shuttle tanker. Up to three additional exploration wells are planned
designed to deliver chemicals such as scale inhibitor, corrosion inhibitor, biocide, etc. throughout the oil & gas process subsea, subsurface and topside. Te fabrication of these four units comprised of carbon steel skids with various capacity stainless steel reservoirs to contain the chemicals required. To avoid loss of production the methanol and chemical injection systems have been designed with back up of many critical components such as the pumps, flow control valves and flow meters. Should there be a failure then the system can be switched from the duty to the standby component to maintain production. Furthermore, the pumps for the methanol injection skid were sized to maintain a flow rate of 12,000 litres per hour whereas 2,000 litres an hour is a more typical capacity for such
installations. Te chemical injection pumps are of a much lesser capacity, delivering typical flow rates of less than a litre per hour. Te flow to the injection points from both packages is also regulated by flow control devices, which maintain a high level of accuracy regardless of changes to downstream pressure. Te process lines comprise of both 6MO tubework and 316 stainless steel pipework. Process lines up to and including 1in have been manufactured using tube, while pipework has been used for diameters from 1.5in up to and including 1in. As well as the skills of Tyco’s team of expert tube fitters, technicians and electricians, the successful construction of the equipment has relied greatly on the company’s in-house design engineers and industry trained, coded welders.
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