Surface Air Consumption (SAC) Dive Log Refill Pack
Surface Air Consumption is a very useful way to measure how well you are doing as a diver. There are no targets, as everyone is different and one persons optimum SAC rate may be higher than someone elses. However, monitoring your own consumption over your dives can be illuminating and really help you improve.
This is the first of our log pages to be available in full colour as well as our usual black and white. Printed on high quality smooth heavyweight paper and as always available in three different sizes depending on your binder needs:
The standard PADI A5 size with 3 holes punched in it are direct replacements for the PADI adventure log system,
The compact Dive-Logs size matches our own compact Dive-Logs binder with 6 punched holes,
The personal organiser size with 6 punched holes will fit all Filofaxes, SSI binders, and BSAC log books.
We make these from the same high quality paper as our refills. And, as with the refills, the option to upgrade to Rite in the Rain paper is also available.
Each refill pack contains 8 log sheets with space for 144 dives. You also get a copy of the Dive-Logs SAC calculation chart in both metric and imperial formats, an easy to use way to calculate your SAC without having to get out a calculator!
More on SAC Calculations:
Following is a summary on Surface air Consumption, for more detail and background please check out this info page.
We calculate a surface air consumption rate because we breath more gas at deeper depths. By converting it to an equivalent rate as if we were on the surface we can now compare between dives. The calculations to do this are straight forward but a little complex if you don't have a calculator and a piece of paper handy.
This is why we took the calculations and converted them into a set of easy to use graphs that mean finding your SAC rate takes just a few seconds! Let's do an example for a typical dive. You used 140 bar over 30 minutes at an average depth of 18 meters, and you were diving with a 12 litre cylinder:
This chart is copyright Dive-Logs - no unauthorised duplication.
As you can see above, all you do is follow the lines! First take your air consumption and go down until you hit the dive time. Then go left or right depending on your tank size. Stop when you hit your average depth. Then go down to read off your SAC rate.
The above is the combined units chart that is engraved on our placeholders. In each refill pack you get a copy of this chart included but it is broken down into metric and imperial versions for ease of calculation.