FKD - Standard Mixes

UTD STANDARD MIXES

To keep our dives consistent, flexible and as simple as possible, we use standardized mixes. Each mix allows us a range of depths to explore and provides a similar decompression. This eliminates the need to remember a bunch of numbers and the use of decompression tables, since the ascent profiles are consistent within the mixes. In other words, a dive to 150' using 21/35 will have a similar ascent profile as a dive to 200' on 18/45. The primary difference is we'd simply add a 2nd decompression gas (O2) on the 200' dive.

Parameters

Bottom mixes have an MOD PPO2 of 1.4 ata

Bottom mixes have an average PPO2 of 1.2 ata for our working depth

Bottom mixes have a buffer from our working depth and the MOD of 1.4

Bottom mixes are created by adding HE, then topping with 32% (easy for banking 32% and doing trimix fills) or by quick formulas for "air tops"

Deco mixes have an MOD PPO2 of 1.6 ata

Deco mixes have an average PPO2 of 1.2 ata (averaged over the range the deco mixed is used), except for O2 at 20'

Deco mixes are used over an average of 5 10' stops, except for when using O2 for decompression

The higher the HE content, the better, however the HE content must always be enough to provide an END of 100' or less, based on the conservative formula; END = (1 - HE)*ATA's. This formula assumes O2 to be narcotic

Bottom Mix	Depth Range	MOD	END at Max Depth	EAD	"Air Top" Mixing
EAN32	0 - 100'	111'	-	20% credit	14% O2
25/25	100' - 130'	151'	88'	10% credit	12% O2 - 25% HE
21/35	130' - 160'	190'	98'	0%	9% O2 - 35% HE
18/45	170' - 200'	220'	94'	0%	8% O2 - 45% HE
15/55	210' - 240'	275'	90'	0%	7% O2 - 55% HE
12/60	250' - 300'	352'	100'	0%	5% O2 - 60% HE
10/70	310' - 360'	429'	88'	0%	4% O2 - 70% HE
Deco Mix	Depth Range	MOD	END at Max Depth	EAD	"Air Top" Mixing
O2	20'	20'	-	-	O2
EAN50	70' - 30'	70'	-	-	36% O2
35/25	120' - 80'	120'	-	-	25% O2 - 25% HE
21/35	190' - 130'	190'	-	-	9% O2 - 35% HE