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Storage Tank Vent sizing

Storage Tank Vent sizing

Storage Tank Vent sizing

(OP)
Hi All:

How do you size a vent pipe for a storage tank?  More specifically, a vent to atmosphere for a 12000USgal tank.  The tank inlet is 4", 6" O/F, 4" discharge.  The vent pipe will be approx. 50ft long.

any ideas??

Thanks

roggs28

RE: Storage Tank Vent sizing

Yep.  Start with the MAWP of the tank as your source pressure.  Calc dP across the vent line using your required vent/relief rate.  Set exit pressure of line at 0 psig.  Iterate line size until the source pressure (tank pressure) is <= tank MAWP.

Thanks!
Pete

RE: Storage Tank Vent sizing

Review API 2000 “Venting Atmospheric and Low Pressure Storage Tanks” to determine the required flow.  Then follow the advice given in the post above.

RE: Storage Tank Vent sizing

Check whatever design code the tank is built to, to see if it addresses the question.  API-2000 would generally be used for API-650 or similar tanks, but UL specs may just state a vent size in the spec.

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