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Constant pressure water pump questions

Discussion in 'Plumbing and Central Heating' started by abenn, 3 Mar 2021.

  1. abenn

    abenn

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    At my mother-in-law's house in Thailand the mains water feeds into a tank, and a 250-watt Hitachi constant pressure pump supplies the house from the tank at a suitable almost-constant pressure.

    This pump is working, but it's quite noisy and, even with only a toilet cistern drawing water, it's cycling on/off at about 2-second intervals, much to the annoyance of a neighbour.

    The pump's about 7 years old, so the simple solution would be to replace it completely, but I'm just wondering if there's any simpler remedy. To confuse things a bit, my sister-in-law has been asking around, and tells me that she's been told that a square tank gives more-constant pressure. I think there's something lost in translation there, so any thoughts on that please?



    Location: Thailand
     
    Last edited by a moderator: 4 Mar 2021
  2. Gasguru

    Gasguru

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    Pressure is due to height..nothing to do with the shape of a cistern but that's just pressure to feed to pump, the pump itself will determine the available outlet pressure.
    You'd need to find the pump model no. or link to the manual to give us a clue but it's possible it just needs an expansion vessel re-inflating.
     
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  4. abenn

    abenn

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    Thanks for responding to such a vague enquiry Gasguru. We have a language problem here, exacerbated by the fact that the house owner (my sister in law) hasn't the faintest idea about anything technical. Having Googled a bit, I suspect the advice she got about a "square tank" (by which I think she was referring to the pump's pressure vessel) might in fact have been somebody recommending 'Square D' brand pressure switches.

    Anyway, I can't find the model number on the pump, other than it's Hitachi 250 watts. But your suggestion of the expansion vessel needing repressuring, sounds logical, along with my thought that it's maybe simply the pressure switch that's too sensitive. Given the pump's age (7 years) and the fact it's outdoors in a tropical climate, isn't it likely that loss of pressure (if that's the issue) is caused by degradation of the rubber, or whatever, membrane? There's no leaks evident in the pressure vessel itself.
     
  5. Gasguru

    Gasguru

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    On any pressure vessel the pressure should be checked annually at least and topped up.
     
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  7. abenn

    abenn

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    Thanks Gasguru. I'll see if we can find a pump maintenance man locally.
     
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