Quarter-circle orifice plate
Recommended for viscous fluids
GENERAL DATA
- Standard: ISO / TR 15377.
- 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 25 to 500 mm.
- Accuracy: 2% of max flow.
- Repeatability of the measurement: 0.1%.
- Pressure taps: in the corners, at the flange.
| ISO/TR 15377 | ||
|---|---|---|
| ReD | Reynolds number in pipework | 250 ≤ ReD ≤ 6.104 |
| D | Pipe interior diameter | 25 mm ≤ D < 500 mm |
| d | Orifice diameter | d > 15 mm |
| β | d/D | 0,245 ≤ β ≤ 0,6 |
| Ra | Upstream face roughness | Ra < 10⁴.d |
| r | Quarter circle radius | 0,100.d ≤ r ≤ 0,207.d |
| e | Quarter circle hole thickness | 2,5 mm ≤ e ≤ 0,1.D |
| E | Plate thickness | E ≥ r |
| α | Downstream bevel angle if necessary | α = 45° |
| t | Flatness tolerance | Nous consulter |
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)5.59.30.85.20 or via the contact form. We will respond as soon as possible.
When to use a quarter circle orifice plate?
A quarter-circle orifice plate has a rounded entrance (a bit like a nozzle). It therefore accepts more or less dirty and aggressive fluids since its input radius does not deteriorate. However, for a very aggressive or corrosive fluid, we recommend to apply a resistant coating (deposit of stellite or ceramic projection).
Moreover, it accepts fluids with a low Reynolds number (up to 250) so it is suitable for the measurement of viscous fluids.
To understand and choose from the different orifice plates, refer to the selection table.
