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LANDER LAB #18 emptied at sea, that’s it, no more purging. But if the indicating

Figure 5 desiccant is saturated, spares can be swapped in, or a used one can be recharged in the ship’s galley’s oven in a couple of hours.

Multiple purge cycles to ½ bar remove half the remaining water vapor each time. One cycle takes out 50%. The second cycle takes out another 25% of the original water vapor. A third cycle takes out 12.5% of the original water vapor. Three cycles together remove 87.5% of the original water vapor. So look for a system that can provide multiple purge cycles conveniently.

Sea-going teams also know that loose items need to be tied down before leaving the dock. Global Ocean Design’s Deck

A Deck Purge Box from Global Ocean

Purge Box is a single integrated unit, easily secured to a bench

Design is an integrated unit without top. It incorporates a universal power supply, so it readily adapts hazmat that performs the vacuum leak test and desiccation process of a to foreign ships-of-opportunity. There are no hazmat components housing’s entrained air. It is simple to such as high-pressure bottles or biohazardous chemicals. It is CE secure to a benchtop of a rolling ship.

Image courtesy: Global Ocean Design LLC compliant. It has been in production for over 15 years, and used “Lander Lab” is a hands-on column of Ocean Lander tech- on housings deployed at all latitudes and all depths, for short and nologies and strategies, a unique class of unmanned undersea long durations, by worldwide research institutions and industries.

vehicles, and the people who make them. It is meant to serve

PRVs are a useful device when the potential for high interior the global ocean lander community in the manner of Make pressure needs to be mitigated. PRVs should be used for their primary intended purpose: venting excess interior pressure. Magazine and other DIY communities.

Comments on this article, or suggestions for stories of inter-

The companies that make them do so with the best interest est to other Landereans are welcome. Ocean lander teams are of the end-user in mind. There are important subtleties to un- encouraged to write in about their work. Please feel free to derstand for their successful incorporation into subsea equip- contact Kevin Hardy .

ment. Use a dedicated purge port when one is called for.

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[email protected] 16 March/April 2026

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