Recommended for dirty, charged or diphasic fluids
GENERAL DATA
- Standard: DIN VDI / VDE 2041.
- Mounting between flanges: ISO PN 2,5 to PN 420, ASME 150 # to 2500 #, others on consultation.
- Material: Standard: 304L / 316L stainless steel, others according to your application.
- Fluid: liquid, gas, steam.
- Diameter of pipes: from 100 to 350 mm.
- Accuracy: 1.2% of max flow.
- Repeatability of the measurement: 0.1%.
- Pressure taps: in the corners or at the flange.
| DIN VDI/VDE 2041 | ||
|---|---|---|
| ReD | Reynolds number in pipework | 104 ≤ ReD ≤ 106 |
| D | Pipe interior diameter | 50 mm ≤ D ≤ 500 mm |
| h | Orifice height | h ≥ 12,5 mm |
| β | d/D | 0,316 ≤ β ≤ 0,707 |
| Ra | Upstream face roughness | Ra < 10⁴.h |
| e | Orifice thickness | 0,005.D ≤ e ≤ 0,02.D |
| E | Plate thickness | e ≤ E ≤ 0,05.D |
| α | Downstream bevel angle if necessary | α = 45° ± 15° |
| t | Flatness tolerance | t < 0,005.(D - h)/2 |
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A segmental plate has an orifice placed not in the center of the pipe (like a sharp edge plate for example) but an eccentric orifice. It is positioned so that the outer part of the orifice is tangent with the piping at the bottom; thus, no dirt can accumulate at this point and clog the flowmeter.
The choice between a segmental plate and an eccentric plate is made by calculation according to the characteristics of the fluid. Pipe diameters and Reynolds number ranges differ slightly from one plate to another.
To understand and choose from the different orifice plates, refer to the selection table.
