VENTURI TUBES (ASME VENTURIS)
firstname.lastname@example.org P.O. Box 352262 Los Angeles, California 90035 (USA)
Imperial manufactures a complete line
of differential pressure ASME Herschel type venturis. Imperial venturis are in operation
in petrochemical, refining, gas pipeline, water sewage and power plants. Venturi tubes are
used whenever low pressure loss, high accuracy, short straight piping or high-solids
fluids are encountered. ASME Herschel-type venturi tubes have been universally
accepted as the most efficient primary device available. No other type of venturi or flow
tube design has been more thoroughly researched, tested, and proven than the ASME type.
Each Imperial venturi is designed and manufactured for a specific beta ratio or throat
diameter to meet differential pressure and flow requirements. Due to the extent of
published research on venturis, Imperial is able to provide venturis with 0.75% accuracy
without the need for laboratory flow calibration. This high accuracy is sustained
indefinitely since there are no sharp edged protrusions to wear. Also, a new approach is
used to attach upstream and downstream cones to the throat to manage the best possible
velocity profile in the venturi throat. Imperial venturi tubes are designed to be
economical, lightweight, versatile, non-corrosive, and accurate to meet the customer's
Due to the low pressure loss, a venturi saves the user many dollars and frequently pays
for itself in one year of continuous operation by greatly reducing pumping cost. If lower
pressure loss is required please consider the flow tube or our TA2% low loss design.
For fluid containing solids, such as sewage or slurry, Imperial venturis can be equipped
with cleanout rods on the pressure taps for periodic cleaning when required. Imperial
venturi meters are manufactured from carbon steel, chromalloy steel, stainless steel,
monel, nickel, bronze, hastelloy, fiberglass, PVC and other materials to suit specific
applications. A fabricated venturi is more durable than a cast venturi yet weighs
considerably less, which results in a lower shipping cost and easier installation.
The text ASME Fluid Meters recommends a certain length of straight pipe upstream
of a venturi meter to ensure accurate flow measurement. If it is impossible to meet the
recommended lengths, with or without straightening vanes, Imperial venturis utilizing a
piezometer ring or averaging annulus can be provided to reduce measurement error.
Along with venturi meters, Imperial Flange manufacturers ejectors, eductors, and
differential pressure transmitters.
Utah Water Research Laboratory Calibration Report
Click on the pages from our venturi tube manual or scroll down page to see enlarged