Vortex Breakers in API 650 Tanks

[TarikY]

How much product should there be above a vortex breaker to ensure vortices do not form in a pump suction line?

There are lot of calculations and thumbrules out there for volume needed above an internal pipe in order to avoid using a vortex breaker, but I don't see any guidance if there is already a vortex breaker. The question becomes- as long as the vortex breaker is covered by product, is there a general assumption that vortices will not occur? I am trying to determine if I can have an internal pipe come straight in to a tank, or if it needs to elbow down. Specifically on this application, I'm use a PIP VEFV1124 cross-type vortex breaker.

This topic is related to minimum level in the tank to operate the pump. ie: if i need 1 ft above the vortex breaker, I may need to shut down the pump at various elevations depending on where the vortex breaker sits.

 

[georgeverghese]

Some 4-6inches submergence should do it.

 

[IFRs]

Depends on the flow and velocity through the opening as well as the density and viscosity of the fluid and perhaps the vapor pressure of the fluid.

 

[LittleInch]

Elbow down will allow you to go lower than the pipe entry elevation.

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