This fascinating industrial film advertises Oceaneering International's groundbreaking Underwater Atmospheric Diving Suit (ADS), known as JIM. An atmospheric diving suit or ADS is a small one-person articulated submersible of anthropomorphic form which resembles a suit of armour, with elaborate pressure joints to allow articulation while maintaining an internal pressure of one atmosphere. The ADS can be used for very deep dives of up to 2,300 feet (700 m) for many hours, and eliminates the majority of physiological dangers associated with deep diving; the occupant need not decompress, there is no need for special gas mixtures, and there is no danger of decompression sickness or nitrogen narcosis. Divers do not even need to be skilled swimmers.
The first JIM suit was completed in November 1971 and underwent trials aboard HMS Reclaim in early 1972. In 1976, the JIM suit set a record for the longest working dive below 490 feet (150 m), lasting five hours and 59 minutes at a depth of 905 feet (276 m). The first JIM suits were constructed from cast magnesium for its high strength-to-weight ratio and weighed approximately 1,100 pounds (498.95 kg) in air including the diver. The suit had a positive buoyancy of 15 to 50 pounds (6.8 to 22.7 kg). Ballast was attached to the suit's front and could be jettisoned from within, allowing the operator to ascend to the surface at approximately 100 feet (30 m) per minute.The suit also incorporated a communication link and a jettisonable umbilical connection. The JIM operator received air through an oral/nasal mask that attached to a lung-powered scrubber that had a life-support duration of approximately 72 hours, although actual survival for this time would have been unlikely due to thermal transfer through the magnesium body.
As technology improved and operational knowledge grew, Oceaneering upgraded their fleet of JIMs. The magnesium construction was replaced with glass-reinforced plastic (GRP) and the single joints with segmented ones, each allowing seven degrees of motion, and when added together giving the operator a very great range of motion. In addition, the four-port domed top of the suit was replaced by a transparent acrylic one that was taken from Wasp, this allowed the operator a much-improved field of vision. Trials were also carried out by the Ministry of Defence on a flying Jim suit powered from the surface through an umbilical cable. This resulted in a hybrid suit with the ability of working on the sea bed as well as mid water.
Atmospheric diving suits in current use include the Newtsuit and the WASP, both of which are self-contained hard suits that incorporate propulsion units. The Newtsuit is constructed from cast aluminum (forged aluminum in a version constructed for the US Navy for submarine rescue), while the WASP is of glass-reinforced plastic (GRP) body tube construction. The upper hull is made from cast aluminum. The bottom dome is machined aluminum.
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This film is part of the Periscope Film LLC archive, one of the largest historic military, transportation, and aviation stock footage collections in the USA. Entirely film backed, this material is available for licensing in 24p HD and 2k. For more information visit www.PeriscopeFi...
20 авг 2024
