Turbine meters utilize a rotor that is designed to spin at a rate that is nominally proportional to the velocity (volume) of gas passing through the meter. In most cases, turbine meters are initially calibrated by the manufacturer when they are produced. The initial turbine meter calibration curve establishes a relationship between the meter output (K-factor, pulses per unit volume) and the flow rate. Depending on the design of the meter, the output characteristics may be sensitive to the flow rate and/or the fluid characteristics.
Over time, changes in the mechanical bearings, blade surface finish, and other factors can result in changes in the meter calibration curve that lead to flow measurement inaccuracies. Some regulations (e.g., the U.S. Environmental Protection Agency’s Emissions Monitoring Policy described in 40 CFR 75) require proof of a meter’s accuracy on a regular basis, which for turbine meters, means a recalibration.
Turbine Meter Calibration Services
The Southwest Research Institute Metering Research Facility regularly provides turbine meter calibration services that align with the requirements of AGA Report Number 7. Instead of using a fixed K-factor, a significant improvement in meter accuracy can be achieved by using a flow dependent determination of the meter’s K-factor that can be implemented in a flow computer.
Turbine meter calibrations can be scheduled in advance to coincide with planned outages and performed with quick turn-around times to minimize down time.
Turbine Meter Troubleshooting
SwRI can assess meter installations and meter operations through reviews of station design drawings and measurement logs and through on-site meter station reviews.
Flow Measurement & Metering Research
- Flow Measurement Services
- Flow Measurement Research Programs
- Flow Meter Calibration Services
- Flow Test Systems & Flow Calibration Capabilities
- Metering Research Facility
Or call Terry Grimley at +1 210 522 2353.