Friday, December 8, 2017

Precision Turbine Flowmeters

turbine flowmeter for custody transfer
Turbine flowmeter applicable to custody transfer operation.
Image courtesy Hoffer Flow Controls
Precision turbine flow meters are specially designed to accommodate a broad range of precise fluid measurement applications. They can handle greater flow rates with lower pressure drop than other meters in their class. The turbine's high-frequency digital output is suitable for interfacing with an assortment of readout and recording equipment. Some turbine flow meters have a bi-directional design that supports reverse flow applications without a reduction in accuracy or capacity.

Turbine flowmeters can be fabricated from a variety of materials to accommodate the target media and other application considerations. Product selection should incorporate aspects of useful measuring range, corrosion resistance, and anticipated operating life for a particular application. Some beneficial product features include:
  • A low mass rotor which promotes rapid response to changes in flow.
  • Deflector cones or other structures that reduce downstream thrust on the rotor bearings to enhance performance and extend bearing life
  • Integral flow straightening tubes or other shapes that dampen the effects of upstream flow turbulence. 
  • A single moving part, the rotor.
The flowmeter housing is made of nonmagnetic materials. The rotor is made of magnetic or magnetized material. As fluid flows through the instrument, the rotor spins. The angular velocity of the rotor vanes is proportional to the fluid flow rate. Pickups mounted on the housing sense the passage of the rotor vanes, providing a pulsed signal that can be used to calculate the fluid velocity, volumetric flow rate and totalized flow.

Turbine flow meters, with their simple, durable construction and wide operating range, can be the best choice for a number of applications. As with all instrumentation, there are factors to consider when making a selection. Share your flow measurement challenges and requirements with instrumentation specialists, leveraging your own process knowledge and experience with their product application expertise to develop an effective solution.