Problems with metal tube float flowmeters
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What issues should be considered when using metal tube float flowmeters for on-site display? This is for on-site display only; the signal does not go to the control room. What is measured here is demineralized water
For demineralized water, the following points should be noted: . Due to the regeneration process, which may involve the use of hydrochloric acid or alkalis for regeneration, metal pipes must be able to resist corrosion by these substances; metal pipes lined with a protective coating could be considered. If it is an alkaline solution, stainless steel material will suffice. . It is generally installed on the vertical pipe, with the flow direction from bottom to top. . The installation height should be chosen to facilitate the reading of the flow data on the gauge.
Thank you! But I think these are the precautions for metal tube float flowmeters used in control rooms! Does the on-site display show any difference?
When putting a metal tube float flow meter into use, great care must be taken to follow the correct sequence for opening the valves. In design, a bypass is usually required: first open the bypass valve, wait for stability, then open the valve behind the main valve, gradually open the valve in front of the meter, and finally close the bypass valve slowly. This is done to prevent the metal float from being damaged by water hammer effects. Two units in our factory have failed, both due to operators not following the operating procedures.
Generally, it only needs to be installed vertically, with the fluid flowing from bottom to top.
The principle remains the same whether there is a signal or not, and the precautions are also the same