Scuba Tank Duration

MARITIME – DIVE & UNDERWATER OPERATION CALCULATOR Scuba Tank Duration A precise tool.
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What is the Scuba Tank Duration & How does it work?

Surface Air Consumption (SAC) is the rate at which a diver uses breathable air at the surface, expressed in litres per minute (L/min). It is measured during a calm breathing test and provides a baseline for estimating gas usage at depth.

When a diver descends, the ambient pressure increases roughly 1 atmosphere (atm) for every 10 m of seawater. Because the gas is compressed, the same SAC rate consumes more gas proportionally to the ambient pressure: Effective consumption = SAC × (1 + depth/10).

\text{Duration};=;frac{Vtimes P}{text{SAC}timesleft(1+frac{d}{10}right)}
Duration = minutes of breathable air available

A scuba tank’s usable air is the product of its internal volume (V, in litres) and its pressure (P, in bar). By dividing this total air supply by the depth‑adjusted consumption rate, we obtain the theoretical dive time before the tank is empty.

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Frequently Asked Questions
How does depth affect gas consumption in scuba diving?
As depth increases, ambient pressure rises, causing the same SAC rate to consume more gas. Effective consumption = SAC × (1 + depth/10).
What is Surface Air Consumption (SAC) in scuba diving?
SAC is the rate at which a diver uses breathable air at the surface, measured in litres per minute (L/min), and serves as a baseline for gas usage at depth.
How do I calculate my effective gas consumption at depth?
Multiply your Surface Air Consumption (SAC) by (1 + depth/10) to get the effective gas consumption at a specific depth.
Can you explain how pressure affects air consumption in scuba diving?
For every 10 meters of depth, ambient pressure increases by approximately 1 atmosphere. This compression makes the same SAC rate consume more gas.
What is the importance of knowing your SAC rate?
Knowing your SAC rate helps in planning dive times and gas requirements for different depths, ensuring safe and efficient diving.
How do I measure my Surface Air Consumption (SAC) rate?
Measure SAC by conducting a calm breathing test at the surface to determine how much air you consume per minute.
Can this calculator help me plan my dive duration?
Yes, by inputting your SAC rate and planned depth, the calculator can estimate the duration of your scuba tank based on gas consumption rates at different depths.

Results are for informational purposes only and do not constitute professional advice.