Quote:
| Originally Posted by [b Quote[/b] (aclivity @ Sep. 08 2003,12:06)]I downloaded the GUE overview a couple of weeks ago, and have finally had time to start reading it today. One question immediately springs to mind.
In one section it states that ONLY aluminium cylinders shall be used as stage cylinders, not steel. I haven't read far enough to see if this also covers back mounted cylinders (from what I understand it doesn't) but I'd be interested to know what the thinking is behind this particular rule?
Andy |
Put simply, Buoyancy.
It's not just that the stage bottles are ally but also that they display the right kind of buoyancy characteristics. Basically they should go from slighty -ve to slightly +ve as you use the gas in them. Obviously you need to factor in the gas that's being carried etc.
It's all again about having a balanced rig. Ally bottles with the right buoyancy characteristics have minimal impact on a divers buoyancy and therefore you don't need to have a wing the size of a liferaft to cope with them.
HTH
Rob