Sea Technology

JUL 2017

The industry's recognized authority for design, engineering and application of equipment and services in the global ocean community

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Page 21 of 68 July 2017 / st 21 Eliminating Gas Trapped gases can be prob- lematic at any depth and are most dangerous in the deep ocean. The requirement for a perfectly airtight seal after any jointing process meant using specially made applicators rather than traditional "daub- ers." These specialized tools allowed the team to monitor the application closely and eliminate bubbling during construction, forming the nec- essary seals. Internal parts that required bonding were joined, not with conventional adhe- sive but with a heavy cement, again adjusting for and elimi- nating any bubbling. Following the preliminary assembly of all base components, a unique methodology was applied to remove the presence of any gasses during the injection of the fluid medium and prevent any additional gasses from entering the finished product. Depth Testing and Results The prototype battery was delivered to the University of Washington, School of Oceanography's Applied Physics Laboratory for initial pressure testing in December 2016. The university's testing apparatus is a WWII vintage, 16-in. OD explosives housing used on U.S. Navy battleships. It is rated to a safe working pressure beyond 12,000 psi. The system is limited only by the pressure gauge and pneumatic throttling manifold used to achieve 10,000 psi with normal shop air pressure. However, the gauge maximums are abso- lute, so the pressure was set to 9,800 psi, which corresponds to approximately 6,712 m (about 22,020 ft.) of seawater. After an intensive testing session, the results proved Energy Sales' design is fit for deep-ocean applications.

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