An orifice plate is device is used for measuring flow rate, for reducing pressure or for restricting flow. Either a volumetric or mass flow rate may be determined, depending on the calculation associated with the orifice plate.
This most common bore used in the industries. This is the only type generally accepted for use in custody transfer measurement, since adequate data is not available for other bores. Used primarily for clean homogeneous liquids, gases, non-viscous fluids. The bevel is matched at 45° angle to the desired throat thickness.
This type is not used for flow measurement but for dropping the pressure considerably and reducing the flow accordingly. The bore is not beveled but kept straight. The beta ratio has no limit as accuracy is not the goal.
Used for measurement of flow for fluids containing solids and slurries. It is also used for vapors and gases where condensation is present. The eccentric bore is offset to where the bore edge is inscribed in a circle that is 98% the line id.
The segmental bore is located in the same way that the eccentric bore is. This type is used primarily for slurries or extreamly dirty gases wher the flow may contain impurities heavier than the fluid.
Used for high viscous fluids such as heavy cruid, syrups and slurries. It is always recommended for flow where Reynolds number is less than 10,000.The inlet is quarter of a circle and the plate thickness must be at least radius of the inlet.
SPECTEC offers a complete range of orifice plates for a variety of flow conditions for mounting between flanges for carrier rings and with RJ plate holder for mounting between RJ flanges.
SPECTEC'S orifice flange Assemblies are made to AGA/ASME recommendations and are reliable means to flow measurement.
Assemblies to other international standards viz. ISO, BS, DIN etc. are also available.
Spectec's orifice flanges cover complete range of sizes pressure rating upto ASA 2500 of ANSI B16.36 as standard and dimensions As per other major international standard viz. - APL, MSS, BS and DIN etc. are also available on request. These flanges are available in various types such as weld neck, slip on, screwed with facing FF RJ, TG etc. a various types of tapping available are viz. Flange, corner and D_D/2. Orifice bore calculation can be carried out as per ASME MFC-3M, ASME 19.5 ISO 5167/BS1042, R.W. MILLER and L.k.spink etc.
| Flanges | Carbon steel/ ASTM A105/ ASTM A 182/ ASTM A 350/ SS304/ SS304L/ SS316/ SS 316L/ PP/ PTFE |
| Orifice Plate | SS304/ SS304L/ SS316/ SS316L/ Monel/ HAST ALLOY/ PP/ PTFE Other material on request. |
| Stud & Nuts | MS/ SS/ ASTM A193 Gr. B7/ A194 Gr. 2H |
| Gasket | SPIRAL WOUND/ CAF/ PTFF/ AF120 |
* Fasteners & Gaskets of other material specification available on request