Venturi Tube

Description

Venturi tube is a device made up of an entrance cylinder connected to conical convergent cone, a cylindrical throat & a divergent section. The internal surface of the device is cylindrical & concentric with the pipe centerline.

Eureka's VEN series is suitable for measuring liquid, gases as well as steam flow. Since there is no sharp edge or protrusions in the flow section, the venturi offers a very low pressure loss & high measurement accuracy.

The typical geometry of venturi offers a good repeatability & pressure recovery. Thus it reduces operating costs & also reduces straight length requirement.

Typically the convergent angle is fixed to 21deg. Divergent angle can be varied between 70- 150 without any effect on the pressure loss & discharge coefficient.

Applications

  • Steel Plant
  • Gas Processing & Transmission
  • Sugar Industry
  • Power Plant
  • Oil & Gas Industry

Features

  • Can be used for fluids containing dust of suspended particles.
  • Short upstream & downstream length required.
  • Less susceptible to erosion.
  • Low permanent pressure loss & high pressure recovery.
  • No maintenance since no moving parts.
  • Easy installation procedure.

Design & Manufacturing Standard

  • ISO-5167 part IV

Nominal Sizes Available

  • Diameters 50mm to 1200mm, as specified by standards for respective type
    For larger sizes please consult Eureka representative.

Models Available

  • Machined Type
  • Fabricated Type

Pressure Tapping

  • Throat taps

Materials

Selection based on temperature & process conditions. Available materials are

  • For Machined type: Any forged material. E.g. SA.105, SS316, Inconel, Monel, Duplex Stainless Steel.
  • For Fabricated type: Material in the form of plates. E.g. IS2062, IS.2002, SA516Gr.60/70, SS316, UNS31803, etc.

*Other materials are available on request

Machined Type Venturi

Machined venturi is manufactured by machining the inner profile from a solid forged bar. This is a single piece construction.

The end connection can be either BWE or Flanged, as per requirement.

Size limits 50mm to 250mm.
Uncertainty in discharge coefficient ± 1%
ReD 2 x 105 to 1 x 106
β 0.4 to 0.75

Pressure tapping can be either through adaptor OR through piezometric ring. Piezometric ring uses the principle of averaging the readings.
The ring is manufactured from forging.


Fabricated Type Venturi

This type of venturi is fabricated from the sheets. Venturi is fabricated in different parts namely Inlet cylinder, convergent cone, throat & divergent cone. Then all these separately fabricated parts are welded together to form the complete assembly.

The end connection can be either BWE or Flanged, as per requirement.

Size limits : 250mm to 1200mm.
Uncertainty in discharge coefficient : ± 1.5%
ReD : 2 x 105 to 2 x 106
β : 0.4 to 0.7

Pressure tapping can be either through direct tapping OR through piezometric ring. Piezometric ring uses the principle of averaging the readings.
The ring is fabricated from channel or pipe.