#850
|
A couple of flaws here. A safety stop is not needed. In an emergency plan on skipping it. Do it if you feel your gas supply can handle it. remember Rule # what ever (DIVE WITH IN THE NDL) That means NO STOP IS REQUIRED. The safety stop is and always has been an OPTIONAL stop, not a MANDITORY one.
Next you example of being 130 ft allows zero penitration. Rule # what ever 130 linear feet to the surface. If you are at 50 ft youare allowed 80 ft penitration. If at 100 ft you are allowed 30 ft penitration.
Next if at 130 ft and using a 30 ft/min ascent that is apx 4.5 min.
A 19 is still not reasonable. Always plan for murphy showing up. You may need to stay on the reg while on the surface for some time till picked up. A current could have drifted you far from the boat. Your bc will need 1 cu ft to fill and suspend you on the surface. The boat may have nad to relocate to pick up another diver.
From Aikidiver: Ok, you’re going to make me sharpen my pencil here, let me give this a try! If I’m 130 feet down, to reach the surface it will take me at least 260 seconds, but lets just round that up to 300 seconds even. I need to add in a 3 minute safety stop, so that’s 180 seconds, added to my 300 second ascent, makes it 480 seconds. Divide 480 by 60, gives 8 minutes. If my SAC is 2.0 cu ft per minute (more than double my normal rate due to the added stress of an out-of-air situation), 8 min times 2.0 cu/ft ... From Aikidiver: Ok, you’re going to make me sharpen my pencil here, let me give this a try! If I’m 130 feet down, to reach the surface it will take me at least 260 seconds, but lets just round that up to 300 seconds even. I need to add in a 3 minute safety stop, so that’s 180 seconds, added to my 300 second ascent, makes it 480 seconds. Divide 480 by 60, gives 8 minutes. If my SAC is 2.0 cu ft per minute (more than double my normal rate due to the added stress of an out-of-air situation), 8 min times 2.0 cu/ft ...
|