J
- jackstay
- A line secured at both ends to serve as a support or guide.
- Jack-up rig
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A type of mobile platform that consists of a buoyant hull fitted with a number of movable legs, capable of raising its hull over the surface of sea. The buoyant hull enables transportation of the unit and all attached machinery to a desired location. Once on location the hull is raised to the required elevation above the sea surface on its legs supported by the sea bed.
- J-cylinder
- Bulk gas storage cylinder with internal volume 50 litres.
- Jersey upline
- see upline
- JIC fitting
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A type of pipe and hose fitting with a 37-degree flare seating surface. Commonly used in umbilical hose connections.
- JIM suit
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An atmospheric diving suit manufactured by Underwater Marine Equipment Limited.
- Jonline
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A short line used to connect to a shotline or anchor line, allowing the diver to move a short horizontal distance away to decompress. The line helps compensate for vertical movement in the anchor line or shot line due to waves.
- Jump jacket
- The Jump Jacket is a harness with integral buoyancy jacket specifically designed for commercial diving work with helmets and bells.
- jump line
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See also: Cave diving
A short cave line used to connect between two permanent lines that are not in contact. May also be used to search for the other end of a break in a cave line and repair the break
- J-valve
- Scuba cylinder valve with lever operated reserve mechanism.
Read more about this topic: Glossary Of SCUBA Diving