1. Introduction

To give the best performance, KROHNE flowmeters must be installed in a correct way. Important instructions should be taken into consideration, like the inlet and outlet length, pipe to be completely filled, direction of the flow, etc. Depending on the measuring principle of each device, the guidelines will differ. In this article we will explain the installation instructions for Mass flow meters.


The article cover the following topics:


  • Guidelines for liquid measurements
  • Guidelines for gases measurements
  • General guidelines


2. liquids measurements


  • A horizontal installation is independent of flow direction.
  • In case of vertical or inclined installations ensure the direction of flow is upward.
  • In case of vertical installation for drainage or applications with gas bubbles prepare the pipework to provide a good zero calibration, density calibration and maintenance. 
  • Avoid mounting the meter with the flow running downhill because it can cause siphoning. If the meter has to be mounted with the flow running downhill, install an orifice plate or control valve downstream of the meter to maintain back pressure.
  • Avoid mounting meter with long vertical runs after the meter as it can cause cavitation. Where the installation includes a vertical run after the meter, install an orifice plate or control valve downstream to maintain back pressure.

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3. Gases measurements 

  • For all gas applications the location of a horizontally installed meter should be high up in the pipework system to stop liquid build up in the meter.
              

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  • For a vertical mounting, upward flow is preferred but downward flow is possible (only in that case with gases).
  • For bent tube meters in a horizontal mounting, install bent tube meters upside down with the measuring tubes above the pipework, to prevent build-up of fluid in the measuring tubes.
  • when no gas is flowing. These last two installation considerations are the opposite of how a meter should be installed for a liquid process application.
       

4. General Guidelines      

  •  In case of solids or dirt its recommended to install a filter before the device.
  •  Ensure that isolation valves are installed locally to guarantee a No flow condition for zero calibration, which is especially  important for gas measurement.
  •  A bypass loop may also be required for maintenance on continuous processes.
  •  Make sure that there is no air bubbles or en-trained gas (if that can’t be avoided customer can use entrained gas management  EGM Mass flowmeter  with Continuous and repeatable mass flow or density measurement up to 100% entrained gas)