WATER TANK ROOF VENT SIZING
WATER TANK ROOF VENT SIZING
(OP)
Can anyone assist with the technical backing on the sizing of roof vent nozzle for a water tank D=7.4m, H=7.5m
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WATER TANK ROOF VENT SIZING
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RE: WATER TANK ROOF VENT SIZING
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: WATER TANK ROOF VENT SIZING
Let the long sad process of getting details from the OP begin !!!
MJCronin
Sr. Process Engineer
RE: WATER TANK ROOF VENT SIZING
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: WATER TANK ROOF VENT SIZING
1) Vent size must be able to pass input filling or output emptying of liquid at the same rate it flows in the tank or out of the tank and not exceed the tank design pressure which is usually very small on the order of inches of WC or less. Therefore if you take the expected maximum flow in or out of the tank say 1000 gpm and convert to cubic feet per second this is the volume of gas that it must pass in or out without exceeding the positive or vaccuum design pressure. In this case the gas in the tank will be air with saturated water vapor.
2) Since API was developed for oil and gas storage tanks there is also a component of vaporization of the volatile components in the tank. For instance gasoline is very volatile so as the tank is filling or emptying there are vapors generated by the liquid which also adds to the volume that needs to be included in the design flowrate through the vent. However with water in tank I don't think this vaporization amount will matter that much but check API if there are any allowances.
RE: WATER TANK ROOF VENT SIZING
Here is a sample calculation with explanation on the web:
https://chemicalprocessengineering.com/api-tank-br...
RE: WATER TANK ROOF VENT SIZING
For a manufactured vent or P/V vent, get flow curves or data from the manufacturer.
For shop-fabricated vents, ASHRAE has duct-flow data that covers screens, exhaust hoods, etc., and some of that can be applied.
RE: WATER TANK ROOF VENT SIZING
RE: WATER TANK ROOF VENT SIZING