Flow Measurement & Control


High performing insertion DP flowmeter

January 2005 Flow Measurement & Control

By integrating pressure transmitter electronics with the Annubar averaging pitot tube (APT), Rosemount claims it has the highest performing insertion DP flowmeter. This fully integrated flowmeter eliminates the need for fittings, tubing, valves, adapters, manifolds, and mounting brackets, thereby reducing welding and installation time.

Annubar's frontal slot design and shape improve the accuracy and repeatability of the flow measurement points. Tight process control is gained by increased signal strength and reduced signal noise. The T-shaped sensor includes a sealed, pressure-retaining thermowell that permits mass flow in all line sizes with a single pipe penetration. Multivariable technology in gas and steam applications compensates for pressure and temperature variations, which can cause significant flow errors.

The Annubar sensor is designed to prevent wear and blockage in the pipe. The electronics exhibit high stability, allowing up to 10 years between calibrations cycles, providing significant maintenance savings. The non-constricting design of the Annubar sensor creates minimal blockage in the pipe, which reduces permanent pressure loss. Permanent pressure loss can be converted directly into energy savings in the form of compressor cost for gas, electrical cost for pumping liquids, and fuel costs for generating steam.

While orifice plate technology has been the overwhelming choice for flow measurement, it ultimately requires significant straight-pipe for accurate results. Rosemount conditioning orifice plate technology is able to provide high performance with minimal straight-run. Orifice metering has become more flexible than it has been before.

The Rosemount conditioning orifice plate requires less straight-run, significantly reducing material, labour and procurement costs. Engineering time is reduced since the flowmeter can be installed virtually anywhere.

Flowmeter capability

Rosemount flowmeters feature a scalable platform, advanced diagnostics and multivariable capabilities, all allowing the user to reduce operational and maintenance expenditures while improving throughput and utilities management.

For more information contact Luculle Stols, Alpret Control Specialists, 011 249 6700, [email protected], www.alpret.co.za



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