What happens if the diver goes into deeper water? The atmospheric pressure, Pa, changes. Receiver tank timing formula (Equation 3):īy placing the values in the Equation 3, we can calculate the time to go from 3,000 PSIG to 1,000 PSIG by breathing normal at the surface. If we stop the test when the tank reaches a pressure of 1,000 PSIG, we can calculate the time by using Equation 3. I will use a standard Surface Consumption Rate, SCR, at 0.8 cubic feet per minute. The diver has a 0.39 cubic feet tank at a pressure of 3,000 PSIG. In this example for scuba diving, we can use this information to configure the amount of time that a tank will last. If the volume of the tank is known, we can calculate how long a system will last. EXAIR recommended the model 9500-60 to be used near the oven to operate the special Air Amplifier during power outage.Īnother way to look at Equation 2 is to create a timing equation. In converting 8 cubic feet to gallons, we get a 60-Gallon Receiver Tank. Receiver tanks are more commonly sized in gallons. V = 6 minutes * 10 cubic feet per minute * 14.7 PSIA / (110 PSIG – 0 PSIG) We are able to calculate the required receiver volume to ensure that the toxic fumes are evacuated from the oven in Equation 2. The compressed air system was operating at 110 PSIG, and the Air Amplifier required an average air flow of 10 cubic feet per minute from the range of 110 PSIG to 0 PSIG.

From the volume of the oven, we calculated that they need the special Air Amplifier to operate for 6 minutes. So, they needed to have a receiver tank with enough volume to store compressed air. What also doesn’t work during power outages is the air compressor. If the power would go out, then the product in the oven would be discarded, but the toxic fumes had to be removed. The material had toxic chemicals that had to cross-link to harden. In this situation, product was being baked in an oven. The Air Amplifier was positioned in the exhaust stack and would only operate during power failures. For example, EXAIR created a special Air Amplifier to remove toxic fumes from an oven. With Equation 2, we can calculate the required volume of a receiver tank after it has been pre-charged. Receiver tank capacity formula (Equation 2) Making Cap = 0, the new equation for this type of receiver tank now becomes Equation 2. Pa – Absolute atmospheric pressure (PSIA) Receiver tank capacity formula (Equation 1)Ĭ – Air requirement of demand (cubic feet per minute)Ĭap – Compressor capacity (cubic feet per minute) During air compressor shutdowns or after being filled and removed, this value becomes zero. In this blog, I will show how you can calculate the size of receiver tanks for applications that are remote or for emergency systems.įrom Lee Evans’ blog, Equation 1 can be adjusted to remove the input capacity from an air compressor. But, we still have potential energy stored inside the tanks similar to a capacitor that has stored voltage in an electrical system. But, what if you want to use them in remote areas or in emergency cases? During these situations, the air compressor is not putting any additional compressed air into the tank. (You can read it here: Receiver Tank Principle and Calculations). My colleague, Lee Evans, wrote a blog about calculating the size of receiver tanks within a compressor air system.

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