Previous post explained how to select the most suitable size of flow meter by using vendors software. Sometimes , you may not have software or no enough time to use the software. However, as an instrument engineer, you should able to do manual calculation as well. Here, will explain how to estimate the proper size of flow meter based on vendors data sheet which is easily can be downloaded or it can be asked from vendor. Please see below Typical Flow Range ( for liquid & gas) Table from Emerson. (This vendors data is roughly and ofcourse it is not considered for fluid viscosity and density). This table showed Velocity values for different size of meter but our process data is usually, flow value. Hence, our process flow shall be coverted to velocity data as below and then we can comapre the given flow meter data and process data ( velocity) After comparison, you can see clearly which size of meter can fit to your required flow range. Process Velocity (m/sec)= Process Flow (m3/hr) / pipe internal cross sectional area (m2) / 3600. To get pipe internal cross sectional area, we need to know pipe internal diameter (ID). Pipe ID will be different on different pipe schedule. This vendors data is for schedule 40. So we can refer schedule 40 of the selected pipe size. Please see the 2nd screen shot to see pipe ID of the relevant pipe size and schedule. Please write any comments if you need any further clarification. Lets share our experiences. Process Control & Instrumentation Community
Posted on: Sat, 02 Aug 2014 16:02:53 +0000
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