PSI used / Time = Depth Consumption Rate (DCR) Example: 225psi /3 min.= 75psi/min (DCR) To calculate Surface Air Consumption rate: DCR / atm’s = Surface Air Consumption rate. (
What is a good surface air consumption rate?
What Is A Good SAC Rate? There is no such thing as a good or bad SAC rate as this will differ between diver to diver. On average a new diver may equate a 25 or 27 litres per minute but a relaxed and experienced diver may equate 15 to 18 litres per minute.
How do you calculate surface consumption rate?
SAC (Surface Air Consumption Rate)
In order to calculate the SAC, you need to do the following: Divide the total air consumed by the total time in minutes of the dive. This gives you the consumption per minute. Take the consumption per minute and multiply that by the total pressure of the average depth of your dive.
How deep can you dive with decompression?
The need to do decompression stops increases with depth. A diver at 6 metres (20 ft) may be able to dive for many hours without needing to do decompression stops. At depths greater than 40 metres (130 ft), a diver may have only a few minutes at the deepest part of the dive before decompression stops are needed.
What is RMV in diving?
Respiratory Minute Volume or RMV is exactly what the name implies: The volume of gas, in either liters or cubic feet, that moves in to or out of your lungs over the course of a minute. … For open-circuit divers, RMV is a way of projecting gas consumption at depth.
How is RMV calculated?
Resting RMV is calculated by descending to a set depth (again 33 fsw or 34 ffw), noting starting pressure, hovering at that depth for 5 minutes, and noting ending pressure. In my courses, I actually have my students do this at 15 or 20 ffw during a 5 minute safety stop.
What does sac stand for in diving?
SAC stands for Surface Air Consumption. Your Surface Air Consumption rate is a measurement of the amount of air you consume while breathing for one minute, on the surface.
Can you treat the bends?
Treatment for the Bends
The bends are treated in a hyperbaric recompression chamber. The doctor will first treat immediate life threats, such as breathing problems or shock, if present. The diver will need high-flow oxygen and IV fluids.
How many Litres of air does a scuba tank hold?
Cylinders used for scuba typically have an internal volume (known as water capacity) of between 3 and 18 litres (0.11 and 0.64 cu ft) and a maximum working pressure rating from 184 to 300 bars (2,670 to 4,350 psi).
What is the difference between a DIN valve and a yoke valve?
First, what is the difference between them? The yoke is a clamp-type mounting, which is placed over the tank valve and then tightened into place. The DIN is a threaded valve, wherein you screw the regulator into the tank valve.
Can you fart while diving?
Can SCUBA divers fart at depths. Farting is possible while scuba diving but not advisable because: Diving wetsuits are very expensive and the explosive force of an underwater fart will rip a hole in your wetsuit. An underwater fart will shoot you up to the surface like a missile which can cause decompression sickness.
Can you dive to the Titanic?
No, you cannot scuba dive to the Titanic. The Titanic lies in 12,500 feet of ice cold Atlantic ocean and the maximum depth a human can scuba dive is between 400 to 1000 feet because of water pressure. … The Titanic is not in an ideal location and getting there comes with many challenges.
What is no stop time in diving?
The “no-decompression limit” (NDL) or “no-stop limit” , is the time interval that a diver may theoretically spend at a given depth without having to perform any decompression stops while surfacing.
How do you convert sac to RMV?
To convert a SAC in bar to an RMV, simply multiply the rated volume by the SAC. In our example, the diver’s SAC was 2 bar, and he was using an 11-liter cylinder. With these numbers a diver can select any cylinder and estimate how many minutes of dive time the cylinder will yield for his personal RMV.