Venturi Meter Question

Refer to the drawing in which water is flowing through a convergent-divergent venturi (see figure below). The pipe diameters at P1 and P2 are equal.

Compared to the conditions at the inlet of the venturi (P1), the pressure at the outlet of the venturi (P2) has __________; and water velocity at the outlet of the venturi has __________. (Assume “real” conditions.)

A. remained the same; remained the same
B. remained the same; decreased slightly
C. decreased slightly; remained the same
D. decreased slightly; decreased slightly

Show Answer



What is the turndown and permanent pressure loss of a Venturi tube?

Turndown ratio is approximately 10:1 and PPL varies from 10%-20% of produced differential pressure depending on Beta ratio.

What materials of construction are available?

Standard materials are CS bodies with 304SS or 316SS throats to aid in cost reduction. Duplex SS, Chrome Moly, Aluminum, Hastelloy, Monel, Inconel, Zirconium, Titanium, Tantalum, Cast Iron, and Ductile Iron are all available.

Are other materials of construction available?

Yes. Exotic materials and alloys are available. Please consult factory.

What is the accuracy of these devices?

ASME PTC-6, ASME PTC 19.5, ASME MFC-3m, and ISO-5167. standard accuracy of +/- 0.50%. Enhanced accuracies of up to +/- 0.25% can be obtained with calibration.