Seeking Guidance: Flow Capacity of 18" Gooseneck Type Free Vent for API 650 Tank Design

[SmallInfo]

Hello experts,

I'm new to tank design and currently searching for information on the flow capacity of a 18" gooseneck type free vent. Unfortunately, the catalogues I've come across only list sizes up to 12". If anyone has access to a catalogue that includes 16" diameter free gooseneck vents or can guide me on how to calculate this, I would greatly appreciate your help.

Additionally, if there's a formulated sheet or resource you could share with me, it would be incredibly helpful in understanding the calculations needed for this design aspect.
Thanks in advance

 

[JStephen]

ASHRAE has duct-flow factors available for ells, screens, inlets/outlets, etc., that can be applied as an approximation. In the older info, that is all in the "Handbook of Fundamentals", not sure about where it's at in newer literature.

 

[Heaviside1925]

OP,
You can do a hydraulic area calculation for the 18", then do it for a 12" or 10", then add the individual flow rates that are available. It doesn't need to be exact, you just need to show that the 18" will pass the required flow rate.

 

[LittleInch]

Go see API 2000.

But you need to define your max tank pressure.

If it's API 650 the lowest is 4 inches of water column.

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