Vortex plate

[Ahmed Habashy]

Hi
We are constructing new tank according to api 650 fire water tank d=20 m H=12.5m
Tank has 2 suction nozzles 14 in at 800mm from bottom
Is this tank require vortex plate on suction nozzles as there is debate between us and the client

 

[HTURKAK]

It depends on drain rate of the tank . If pump inlet velocity is small , vortex formation would not be a problem. IMO, installation of vortex breakers should not be big issue.

 

[LittleInch]

Depends on inlet velocity and min height of water over nozzle, but is usually a good idea.

API 650 for a fire water tank is rather OTT though.

Try adding an elbow down at least

 

[MGXFP]

If you're building a fire water storage tank and the jurisdiction enforces NFPA 22, it must have an anti-vortex plate. See 14.2.13 of NFPA 22.