The Surface Consumption Rate (SCR), also known as the Surface Air Consumption (SAC) rate, is a measure used by divers to calculate the amount of gas a diver consumes per minute while at the surface. This rate is crucial for planning dives, especially when determining how much gas is needed for a dive and for emergency situations.
The SCR is typically expressed in liters per minute (L/min) or cubic feet per minute (cfm). It can be calculated by measuring the diver’s gas consumption rate at a specific depth and then adjusting that rate to account for surface pressure. The SCR helps divers estimate how much air they’ll use during a dive, allowing for better dive planning and ensuring adequate air supply.
To calculate the SCR from your dive
- Used air (bar) × Tank size ( 11.1ℓ / 12ℓ etc )= Used Air (ℓ)
- Used Air (ℓ) ÷ Run time ÷ ATA at the average depth = SCR (using air per minute at one atmosphere)
By using the SCR, divers can better manage their air supply, ensuring safety and more efficient dive planning.
SWIFT transmitter
68,000 JPY
Next generation smart air integration transmitter. The Swift allows divers to carry multiple transmitters reliably. The collision avoidance protocol allows for multiple transmitters to be used at the same time with a lower likelihood of dropped communications. The Swift is designed and built in Canada for demanding divers of all proficiency levels.
