Requirements for straight pipe sections before and after large-diameter rotameters
Thread Content
For a DN100 rotameter with very short straight sections ahead and behind it, practically none at all, what would be the measurement error?
This is really not good; you’d better find some straight sections instead.
Reply to 2# backhamm1982: There is no space for straight pipe sections in the process piping.
Although rotor flowmeters have relatively lower requirements regarding the straight pipe section below them, given your poor installation conditions and the large diameter, it’s even a question whether the cone section of the flowmeter can be fully filled with the medium
1. For rotameters, it is best to have ten before and five after, and the flow must be from bottom to top. 2. Try using a orifice plate instead.
If there isn’t enough straight pipe section, consider adding a flow stabilizer below the flow meter. Large-diameter rotameters are less commonly used. If the requirement for pressure loss is not high, recalculate the parameters of the rotameter and choose a rotor that is heavier but smaller in size; this way, a rotameter with a smaller diameter can be used. This reduces the requirements for the straight pipe section.
The required straight pipe sections before and after a metal rotor flowmeter are 10D in front and 5D behind. If the measurement requirements are not high, then it’s fine. http://www.shakic.com/cp/product10.htm