Model STS Designed for measuring feedwater flow. The meter consists of precision bored pipe, a low beta Throat Tapped Flow Nozzle, a 52 tube straightening vane or a Translineal Flow Straightener, a diffuser cone and differential pressure connections. The ends are beveled for welding and the nozzle is welded in place. An integral inspection opening is provided. The complete Flow Nozzle Meter Run is transported to a hydraulic laboratory recognized by the ASME PTC-6 code committee for calibration.