Overview Here's Why the BIF® UVT's are Superior BIF UVT's Provide High Accuracy with Energy Efficient Design and Operation Mathematical Definitions Basic Hydraulics of Flow Metering Overview Most Accurate of Primary Meters: ± 0.5% of Actual Flow Rate Uncalibrated Maintains Accuracy Over Widest Flow Range Performance Tested - Documented and Guaranteed Unique Hydraulic Shape - Less Affected by Upstream Piping Efficient Hydraulic Shape Provides Low Head Loss Broadest Line of Designs and Materials of Construction Offered in Sizes from 1 Inch to 120 Inches Development History of the Universal Venturi Tube The Venturi measuring principle was first developed in 1791 and has been thoroughly investigated and documented for over 100 years. In 1887, Clemens Herschel introduced the Herschel Standard Venturi, a practical device to measure flow using the venturi principle. In 1893, Builders Iron Foundry (BIF) perfected the necessary metering instruments to measure the differential pressure produced by Herschel's device, enabling BIF to use the Venturi tube as an accurate flow meter. Through many years and thousands of Venturis, BIF remained dedicated to accurate, economical, and reliable flow metering products. This dedication led BIF to develop the UVT - the Universal Venturi Tube. In 1970, the UVT TM was released after thousands of hours of design, engineering, and hydraulic testing. The UVT is a "true" venturi meter based on well documented hydraulic theory. Its performance and metering characteristics are all substantiated per ASME procedures. The UVT greatly increased the accuracy and t reliability of flow meters. Today, BIF is recognized as a leading manufacturer of instruments and systems for process measurement and control. On the following pages we describe the BIF flow meter product line, help you to size the correct flow meter, and offer helpful information to make your flow meter selection easier and quicker. If you have a difficult or unique flow metering application that is not covered in this guide, please contact your nearest BIF representative for a recommended solution. The UVT is very energy efficient There is a misconception that "flow tubes" are more energy efficient than true Venturi type devices ...a"flow tube" being defined as a differential producer which, due to its hydraulic shape, creates a higher differential pressure at a given flow rate than Venturi type devices (UVT), generally by not sensing true static pressures at the high end low pressure taps. "Flow tube" manufacturers would like the user to believe that, since a "flow tube" should be the choice when permanent head loss is a consideration. (Larger Beta ration devices produce lower permanent head loss as a percent of differential than smaller Beta ratio devices.) However, the prime criterion for selection should be overall metering performance (installed accuracy and energy efficiency). When all aspects of an application are considered, the UVT becomes the obvious choice, since extensive lab tests show that it is much less affected by poor flow patterns than "flow tubes". For the same piping configuration, a 0.70 Beta ratio UVT will be affected approximately the same as a 0.55 Beta ratio "flow tube". This now becomes an important consideration when energy efficiency is an essential factor in the overall metering performance envelope.        Copyright © 1997 BIF Comments regarding this site, please contact webmaster@intersoftgroup.com Site created by Jon'taar Graphxs