Calculate CFM on Hydrogen Vent Pipe

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The discussion focuses on calculating the amount of hydrogen lost during venting from a large storage tank that operates at 150 PSI and vents to 120 PSI. The tank holds 2 million cubic feet of hydrogen, and the venting occurs through a 2-inch pipe for 2 to 5 minutes. Key factors influencing the calculation include ambient temperature, the length of the vent pipe, and the presence of fittings. Participants seek clarification on whether the 2 million cubic feet is measured at standard temperature and pressure (STP) or if it represents the tank's actual volume. Accurate calculations depend on these details to determine the cubic feet of hydrogen lost during each venting event.
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I have a large hydrogen storage tank that vents when the pressure exceeds 150 PSI. I am trying to get a rough calculation of how much hydrogen we are losing. I know it is a 2 inch pipe and the pressure drops from 150 PSI to 120PSI. The venting lasts between 2 and 5 minutes. How do I calculate how much hydrogen I am losing?
 
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Chad Pulliam said:
I have a large hydrogen storage tank that vents when the pressure exceeds 150 PSI. I am trying to get a rough calculation of how much hydrogen we are losing. I know it is a 2 inch pipe and the pressure drops from 150 PSI to 120PSI. The venting lasts between 2 and 5 minutes. How do I calculate how much hydrogen I am losing?
1. How big is your storage tank?
2. What sort of ambient temperature is present when the tank vents?
3. How much 2-inch pipe is there from the tank to atmosphere? Are there any fittings (valves, filters, elbows, tees, etc.) in this vent line?
4. After the tank vents, how is the hydrogen replenished?
5. What is the set pressure point on the vent valve?
6. What's the pressure rating of the tank?
 
1. Tank holds 2 million cubic feet of hydrogen
2. Tank is outdoors so ambient can be any temperature in this area ( -10F to 100F )
3. 20 ft of pipe straight up with a 90 as it comes out of the tank and a vent valve.
4. Truck delivery
5. 150 PSI
6. Not sure of the pressure rating but approved for storage of liquid hydrogen.

Thanks for your help
 
At what pressure are these 2 million cubic feet? Atmospheric?
And the tank can hold them at 150 PSI?
 
The hydrogen is stored as liquid similar to a liquid propane tank with vapor that builds on the top.
The vapor in the tank is allowed to reach 150 PSI before venting.
I am curious how many cubic feet we lose each time the tank vents.
2 inch vent line for 2-5 minutes.
 
Chad Pulliam said:
1. Tank holds 2 million cubic feet of hydrogen
2. Tank is outdoors so ambient can be any temperature in this area ( -10F to 100F )
3. 20 ft of pipe straight up with a 90 as it comes out of the tank and a vent valve.
4. Truck delivery
5. 150 PSI
6. Not sure of the pressure rating but approved for storage of liquid hydrogen.

Thanks for your help
I need some clarification on the tank capacity:

Is this 2 million ft3 of hydrogen measured at STP? Does the tank have an actual volume of 2 million ft3 or some other value?
If some other value, then please provide the actual interior volume of the tank.
 

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