Which is the best for accurate flow
Vortex flowmeter or annubar for compressed air measurement in 12-inch line with 0.6 kg/cm²g pressure

 

You need to have a vendor size each, get the sizing sheet and then decide
- whether you can tolerate the Low Flow drop out (zero from 0 to 10% flow = zero), a characteristic of all vortex flowmeters.
- whether the process can tolerate the permanent pressure loss of the bluff body in the vortex meter and the typical one-size-smaller-than-line-size-body (generates a temporary higher flow velocity for an inherent velocity meter), compared to the permanent pressure loss of the averaging pitot tube.
- whether the turndown of the averaging pitot tube and its DP transmitter meets your accuracy spec.
Either could provide a mass flow measurement with the optional absolute pressure transmitter on the vortex or a multivariable with in internal absolute pressure transducer on the averaging pitot tube.

 

You need to have a vendor size each, get the sizing sheet and then decide
- whether you can tolerate the Low Flow drop out (zero from 0 to 10% flow = zero), a characteristic of all vortex flowmeters.
- whether the process can tolerate the permanent pressure loss of the bluff body in the vortex meter and the typical one-size-smaller-than-line-size-body (generates a temporary higher flow velocity for an inherent velocity meter), compared to the permanent pressure loss of the averaging pitot tube.
- whether the turndown of the averaging pitot tube and its DP transmitter meets your accuracy spec.
Either could provide a mass flow measurement with the optional absolute pressure transmitter on the vortex or a multivariable with in internal absolute pressure transducer on the averaging pitot tube.

Th

You need to have a vendor size each, get the sizing sheet and then decide
- whether you can tolerate the Low Flow drop out (zero from 0 to 10% flow = zero), a characteristic of all vortex flowmeters.
- whether the process can tolerate the permanent pressure loss of the bluff body in the vortex meter and the typical one-size-smaller-than-line-size-body (generates a temporary higher flow velocity for an inherent velocity meter), compared to the permanent pressure loss of the averaging pitot tube.
- whether the turndown of the averaging pitot tube and its DP transmitter meets your accuracy spec.
Either could provide a mass flow measurement with the optional absolute pressure transmitter on the vortex or a multivariable with in internal absolute pressure transducer on the averaging pitot tube.

The maximum flow we require is 14000 Nm³/h & minimum required flow is 2000 Nm³/h (reduce line 12 inch for vortex & expand line for control valve )
Our vortex size is 12 inches line size 18 inches valve size 16 inch
Vortex flowmeter full fill our required flow
The confusion control valve fulfill our required flow
Both vendors said it's ok
(Yokogawa vortex) (control valve fisher)