The OMR orifice meter run is a fabricated assembly with 16 pipe diameters of upstream straight pipe and 8 diameters of downstream straight pipe, designed for high-accuracy flow measurement. It is standard for pipeline sizes from 25 to 600 mm (1 to 24 in.) and incorporates kidney flanges with 54 mm centers for direct connection to differential pressure transmitters or manifolds. Flanges are manufactured to ASTM-A105N or ASTM-A350 LF2, with materials including ASTM-A182 F5, F9, F11, F12, and F316(L). Bolts and nuts comply with ASTM-A193 GR B7/L7 and ASTM-A194 GR 2H/H8, respectively, and asbestos-free or spiral-wound gaskets are used. Orifice plates are typically 316 stainless steel. The assembly can be water-calibrated for enhanced accuracy. Maximum working pressure and temperature depend on material selection and application.
ABB standard meter runs comprise of an upstream section with 16 diameters of straight pipe and a downstream section with 8 diameters of straight pipe. The Fiscal version of the meter run is manufactured using specially selected pipe and the orifice calculations are based on the actual (not nominal) measured pipe internal diameters.
If higher accuracy is required, these assemblies can be flow calibrated.
| ABB Measurement & Analytics | |
|---|---|
| Product Category | Flow Orifices and Flow Restrictors |
| Product Number | OMR |
| Product Name | Orifice meter run |
| Fitting / Connection Size | 1 /2 in. NPT as standard |
