Venturi as cast
For a better precision
- Standards: ISO 5167-1 & 4, ASME MFC-3M.
- Solder (BW) or flanged connection
- Material: Standard: carbon steel, stainless steel, others according to your application.
- Fluid: liquid, gas, steam.
- Diameter of pipes: from 100 to 1,200 mm.
- Accuracy: 0.7% of max flow.
- Repeatability of the measurement: 0.1%.
- Upstream and neck pressure points: annular chamber or individual plugs connected in "triple T".
|ISO 5167-1&4||ASME MFC-3M|
|ReD||Reynolds number in pipework||2.105 ≤ ReD ≤ 2.106||2.105 ≤ ReD ≤ 6.106|
|D||Pipe interior diameter||100 mm ≤ D ≤ 800 mm||100 mm ≤ D ≤ 1 200 mm|
|β||d/D||0,30 ≤ β ≤ 0,75|
|Ra||Roughness at the throat||Ra ≤ 10⁴.d|
|Roughness input and convergent cylinder||Ra ≤ 10⁴.D|
|l||Minimum inlet cylinder length||l = D ou (0,25.D + 250 mm)|
|l'||Convergent input length||l' = 2,7.(D - d)|
|α||Convergent angle of entry||α = 21° ± 1°|
|lc||Throat length||lc = d ± 0,03.d (minimum value = d/3)|
|R1||Radius of curvature 1 between the input cylinder and the convergent||R1 = 1,375.D ± 0,275.D|
|R2||Radius of curvature 2 between the convergent and the throat||R2 = 3,625.d ± 0,125.d|
|R3||Radius of curvature 3 between the throat and the divergent||5.d < R3 < 15.d|
|φ||Diverging angle of exit||7° ≤ φ ≤ 15°|
You can find below our most frequently asked questions / answers.
If you do not find the answer you are looking for, please contact us either by phone at +33 (0)184.108.40.206.20 or via the contact form. We will respond as soon as possible.
When to choose a venturi tube "as cast"?
What about the venturi "as cast" with machined convergent?
The convergent of a venturi "as cast" is normally poured into a sand mold to obtain an ideal surface finish and the intersections between the cylinder and the cones are rounded. It is thus possible to obtain a measurement accuracy of about 0.7% of the maximum flow rate. However, for reasons of quantity (the molds are generally made for large series), we often realize venturis "as cast" with a machined convergent. The measurement accuracy obtained is then of the order of 1% of the max flow.