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Gotaverken Appoints Douglas Blomberg operation to relieve pressure above the liquid in the separator tank, and keep the separator tank filled to an adequate level. The vacuum pump initially cuts in and out, and eventu- ally, as stripping progresses, operates continuously. When the suction-dis- charge balance can no longer be met by the vacuum-pump-and-separator arrangement with cargo pumps opera- ting at full capacity, a butterfly valve on the discharge line closes gradually, assuming positions that allow maxi- mum stripping to continue at reduced pump speeds. The Vac Strip system is pneuma- tically controlled, and eliminates the need to throttle the pumps manually to match pump speed to reduce drain- age rates of the tanks. The system is equally suitable for turbine or electric motor drive, and lends itself equally well to assisting in the control of bal- lasting rates. The Vac Strip system has proved itself as a separate system in numer- ous tanker applications, and has been credited with substantially reducing turnaround time. In one case, unload- ing time was reduced from about 36 hours to about 26 hours, a substantial saving for tankers which operate at costs up to about $1,700 per hour. For more information, contact J.F. Connell, Worthington Marine & In- dustrial Products, Inc., Harrison, N.J. Douglas Blomberg In connection with a recent reor- ganization at Gotaverken's Arendal yard, Douglas Blomberg, general manager, has been appointed as- sistant sales manager and head of initial design. The company also announced four other appointments as follows : B.G. Renborg has been appointed general manager and head of pro- duction ; Eskil Mare has been ap- pointed general manager and head of the machinery installation draw- ing offices; Arne Moen has been appointed general manager and head of fitting out departments, and Rolf Bergstrand has been ap- pointed general manager and head of central production control. Worthington Licensed To Market Vac Strip Cargo Stripping System Worthington Marine & Industrial Products., Harrison, N.J., a subsid- iary of Worthington Corporation, has announced a licensing agreement with Worthington-Simpson Ltd., London, to manufacture and market the Vac Strip automated tanker cargo strip- ping system in the United States. As a result of the agreement, WM&IP, a leading producer of cargo pumps, becomes the first U.S. manufacturer of a complete cargo unloading system, including stripping, designed and sup- plied as a single, integrated package. Worthington's Vac Strip cargo un- loading and stripping system utilizes traditional split-case horizontal cargo pumps throughout the entire opera- tion, eliminating separate stripping pumps and their accompanying fit- tings and fixtures. It provides auto- matic one-step cargo unloading and stripping by keeping main cargo pumps operating at a maximum ca- pacity, taking into account the results of decreasing cargo levels in the tanks and automatically adjusting flow speeds to assure maximum discharge —without losing suction and without the need for repriming. The result, Worthington says, is lower initial in- stallation cost, reduced maintenance, and faster tanker turnaround. The heart of the system is a Wor- thington split-case centrifugal cargo pump and a separator tank which is positioned along the suction line. Throughout most of the unloading, the cargo pump operates normally. As the cargo tank level falls, air and gas become separated from the cargo liquid in the separator tank. As air and gas levels increase, a system of vacuum pumps, valves, diaphragms and vents come automatically into " 'HB&miM&ZIS" * • ||| \ Howa great lady of the The 71,500m3 "Polar Alaska" has carried 14,500,000 barrels of LNG from Alaska to Japan at -259F. Her secret? Integrated tanks made of Invar* 36% nickel-iron alloy. *A Registered Trademark of Societe Creusot-Loire (IMPHY) Invar alloy has an extremely low coefficient of expansion which permits the use of flat-design membranes. This allows at least 90% of the welding to be done with automatic welding machines. Invar alloy also has excellent low-tempera- ture mechanical properties. And is tough at cryo- genic temperatures down to -453F. Phillips Petroleum and Marathon Oil used Invar alloy for "Polar Alaska" and her sister LNG carrier, "Arctic Tokyo"—both built in Sweden by Kockums Mekaniska Verkstads AB. Eight other LNG tankers with Invar alloy tanks are in the works. Three of these —being built for El Paso Natural Gas Company and to be completed 18 Maritime Reporter/Engineering News
