Dr. Jeff's Blogs
Dive in water and Chamber Treatment
Your dive has a score that can be calculated from my previous Blog. This score is 500 for a No D Dive on air at sealevel. As the FiO2 increases and your Altitude, the Surface, increases the Dive Score changes. As Nitrogen, as in FiN2, decreases by 1% add 12 to the reference Dive Score of 500. As you altitude increases (either in a lake or tank) for every 100 feet. subtract 2 from the reference Dive Score. Then subtract your corrected dive score, corrected for your mix and for your altitude, from the calculated dive score (depth, feet, times the square root of the time, minutes, of your dive) and divide by 6. This gives the number of minutes to decompress before coming to the surface, 15 to 20 feet below the trough of the waves. If you need more decompression than you have supplies for, consider an On Deck Chamber. Plan your dive.
Linear arithmetic calculations of dive profiles
Linear means that the longer and deeper your dive the more decompression you will need. Tables are often non-linear because of calculation errors that are published as fact. Air diving = a fraction of Oxygen inspired of 21% or 0.21. Multiply the depth of the dive in feet by the square root of the time of the dive in minutes. This reference number is 500 or less for a "no-decompression dive". Subtract 2 from 500 for every 100 feet of altitude of the surface of the lake you are diving in. For O2 enriched air use the amount of other gasses =.79 to calculate a dive score for that mix. E.G NOAA Nitrox 2 (.64N2)=680.
Lubrication defined in the US Navy Diving Manual Revision 6 may be water, oil, or synthetic:
- Prevents wear between friction surfaces
- Seals close clearances
- Protects against corrosion
- Transfers heat away from heat producing surfaces
- Transfers minute particles generated from normal system wear to the oil sump or oil filter
I recommend Amsoil Synthetic Lubricants-Amsoil only makes Synthetics.