Based on Law of Conservation of Energy, when a fluid flows through a constricted section, its velocity accelerates, the increment of kinetic energy causes fluid pressure drop. This is the basic principle which all the differential pressure elements rely on and a meter of pressure drop results in the measurement of fluid volumetric flow rate. Venturi tubes are constrictions or throats in fluid conduits, which cause regions of reduced pressure and are designed to use where low pressure-loss is required.

Venturi tubes are manufactured in multiple sizes and designs according to standards and customer requirements. Eratech team provides venturi tubes suitable for measuring flow rate of wide range of liquids, gases and steam with high temperatures and pressures.

Additional to its low permanent pressure drop, venturi tubes are less affected by upstream disturbances and can tolerate multiphase flows.

Some of Eratech venturi tubes’ main characteristics include:

• Available in a Full Range of Sizes with no Limitation
• Suitable for Liquids, Gases and Steam
• Suitable for Multi-phase Streams and Solid Containing Liquid
•  Tailored with High Temperatures and Pressures
•  Good Performance Even at High d/D Ratios
• Designs Available in Wide Range of Materials

Venturi tubes can be manufactured with several connections to best adapt any process flange connection.

Pressure Loss

• 5 to 20 % of differential head, dependent on the dimensions.

Process Flange Connection

• ANSI/ASME Classes 150 to 2500 (raised face)
• DIN PN10 to PN100 (raised face)
• ANSI/ASME Classes 300 to 2500 (ring type joint)

Flange Ratings

• JIS 10, 16, 20, 30, 40, 63
• ANSI Class 150, 300, 600 and 900, 1500, 2500

Materials

• Carbon steel
• 316 stainless steel
• Low temperature carbon steel
• 1 1/4Cr 1Mo and duplex steel (UNS S31803)

Most Custom Type

• Classical Venturi Tube
• Venturi Nozzle

Flow Calculation Standards

• ISO 5167
• ASME MFC-3M (R.W Miller)

Pressure Taps

• Throat

Fabrication Method

• Machined Throat
• As Cast
• Fabricated as Weld

Nominal Pipe Size

• 2” to 48”

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