Whilst some flow meter manufacturers have developed devices capable of measuring low flows in liquids at high pressures, very few of them perform to a high standard overall. Looking at total installation and life time cost, they are often too expensive and uneconomic to consider as a credible low-flow, measurement solution.
Measuring Low Flows in Liquids at High Pressures, Using Breakthrough Ultrasonic Flow-Measurement Technology
Ultrasonic flow meters, sensors & indicators are new to low-flow/high pressure flow measurement of liquids. Therefore, some care should be taken when specifying this form of technology. Some ultrasonic low-flow measurement devices require zero point adjustment in order to prevent the device showing flow, when there is none. Ultrasonic flow meters are typically calibrated at the factory, but their readings will change with temperature or even mounting methods. In recent developments at ‘Titan flow measurement technologies’, we have addressed these issues. The new Titan 100Bar low-flow Process Atrato does not require ‘in-situ tuning’ whilst recording very low flows. This device is also capable of recording the lowest flow ranges currently available in the flow measurement sector, for this type of technology.
Learn more about measuring low flows in liquids at high pressures, using the Process Atrato
What are the alternatives for the measurement of low-flow rate, high pressure fluids?
Measuring Low Flows in Liquids at High Pressures – Pelton Wheel Turbine Based Flow Sensors
Pelton wheel turbine based flow sensors, packaged in stainless bodies are capable of measuring low flows in liquids at high pressures. They will give the required pressure ratings, reasonable performance and with consistent fluid characteristics. However, they are Reynolds Number dependent. This dictates that complicated electronics and temperature sensing is necessary to accompany the flow meter. These additions are necessary in order to achieve consistent performance during changes in fluid characteristic – or even flow rate. Pelton wheel turbine based flow sensors will not handle viscous fluids at all.
Titan Turbine Flow Meters
Measuring Low Flows in Liquids at High Pressures – Positive Displacement Flow Meters
Positive displacement flow meters are also capable of measuring low flows in liquids at high pressures, but again there are limitations. To work well, the fluid being monitored should have some viscosity – and be perfectly clean, particularly when using oscillating piston flow meters housing relatively-large areas of sliding surfaces. Sliding surfaces wear and are subject to static friction with long term use. We often specify our oval gear meters for these applications as these have relatively small rubbing areas relative to their driving force, and are therefore suitable even for non-viscous liquids.
Measuring Low Flows in Liquids at High Pressures – Coriolis Flow Meters
Coriolis meters are very good but expensive. These meters will give ±0.5% accuracy over a wide flow range at pressures up to 100 Bar.
To discuss specific high pressure, low-flow measurement requirements, projects or problem solving, contact Titan Enterprises via email or phone