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Valve Techbook 2017

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Page 32 of 35 | September 2017 | 31 VALVE TECHBOOK: CASE STUDIES The incremental nature of the orders made for an extra challenge. By going to the foundries and buying more equipment sporadically, it was much harder to plan ahead. Nevertheless, PJV continued to provide quality product and expertise at short notice. The quick turnaround was crucial for the working relationship between PJV and the client as, rather than one large order, valves delivered were spread among 60 or so separate, fast turnaround orders, many with special requirements requiring a range of bespoke testing. In the end, PJV delivered more than 1,000 valves for the project, including floating trunnion mounted ball valves in both side and top entry, and globe and check valves. All valves were cryogenically tested to -196C in accordance with Angola LNG specifications to ensure safe operation. In doing so, PJV made a key contribution to the Angola LNG refurbishment. In May 2016, the plant came back online, shipping its first post-refurbish- ment cargo in June. Kaombo: all at sea Angola LNG, however, is not the only significant recent project for PJV in Angola. Another major devel - opment for the country's oil and gas sector is the Kaombo project, located offshore, about 175 km southwest of Soyo and Angola LNG in the country's Block 32. Due to be completed in 2017, the Kaombo plan is to convert two very large crude carriers (VLCCs) into a pair of turret moored FPSOs, dubbed Kaombo Norte and Kaombo Sul. These FPSOs will be connected via 300 km of subsea lines to 59 subsea wells at depths between 1,400 m to 1,900 m over an 800 sq km site that cov- ers six of the 12 discovered wells in the block. The total estimated reserves across the six wells amount to 650 MMbbl, and daily production is expected to be 230,000 bbl/d. Each FPSO will have an oil treating capacity of 115,000 bbl/d, a water injection capacity of 200,000 bbbl/d, a 100 MMscf/d of gas compression capacity and a storage capacity of 1.7 MMbbl of oil. The associated gas will be transferred to Angola LNG, demonstrating the plant's importance to Angola's plans for its oil and gas industry. PJV and Kaombo Effective treatment of seawater and produced water was crucial to the project for both maximizing oil recovery and maintaining a sufficiently processed resource for re-injection into reservoirs. However, the engineering (and cost) challenge of seawater filtration is its high salinity, making it extremely corrosive and threatening to rapidly eat away at any valves it comes into contact with. The system would require a specialist supplier NOV discovered that the opening and closing of the SPM valves caused the shock in subsea BOP systems. By designing a closed-center valve system, the company was able to virtually eliminate shock. (Photo courtesy of NOV)

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