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Gas Reserve Calculator

Calculate gas reserve requirements for your decompression dive.

🚧 Work in progress 🚧

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Disclaimer

This tool is for educational purposes only and does not replace a careful, responsible dive planning by each individual diver. Follow your training agency's guidelines and never dive outside the boundaries of your training and / or abilities.

«Rock bottom» gas calculation1​

General Dive Settings

Depth and deco

Max depth
First deco stop
Total deco time

Tanks

Back tank volume
Stage volume

Miscellaneous

Typical SAC rate (1 diver)
Ascent rate

Problem Solving Gas

×\times stress factor×(18+18) l/min×5.0 bar=540l (36 bar) of back gas\text{stress factor} \times (18 + 18) \text{ l/min} \times 5.0\text{ bar} = \boldsymbol{540 \text{l } (36 \text{ bar) of back gas}}

Ascent Gas

4min×4\text{min} \times stress factor×(18+18) l/min×3.6 bar=778l (52 bar) of back gas\text{stress factor} \times (18+18) \text{ l/min} \times 3.6\text{ bar} = \boldsymbol{778 \text{l } (52 \text{ bar) of back gas}}

Deco Gas

15min×15\text{min} \times stress factor×18 l/min×2.2 bar=594l (40 bar) of back gas\text{stress factor} \times 18 \text{ l/min} \times 2.2\text{ bar} = \boldsymbol{594 \text{l } (40 \text{ bar) of back gas}}

Turn Pressure

→ Turn pressure: 140 bar

With this turn pressure…

  1. …the two divers can take __1.5__ minutes on the donor's backgas to solve the problem,
  2. then ascend to the first deco stop (12m) at a rate of 8m/min (approximately 4 minutes total) on the donor's backgas,
  3. and one of the two divers can complete their 15 minutes of deco on the donor's backgas.

Footnotes​

  1. Based on 👉 Punkfish Diving: Gasplanung – Das Rock Bottom Prinzip ↩

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