Scott M wrote:
> John wrote:
>
>> First the numbers, then the explanation - it was taking 58 seconds to
>> fill a 1-litre jug, so how many metres static head is that?
>
> Flow and pressure are two different things. You can't tell one from
> the other (tho I presume some rules of thumb might be used to take
> average uses of pipework, stopcocks & taps in a domestic environ and
> calculate an average flow restriction. From that you could have a
> stab at working a pressure from a flow rate.)
>
> Anyway, the most useful thing you need to know is 1 bar (14 psi)
> pressure = 10m head. So their 7m head is 0.7bar which is Not Very
> Much.
> Also, one litre / minute is Very Poor.
>
> IIWY I wouldn't bother with numbers and just fight your corner that
> the water supply was unusable for long periods.
While you're at it, shoot the bozo who fitted a combi in a house with such
poor supply pressure. If ever there was a case for a storage tank system,
you've got it!
Thinking about it, it's hard to believe that any plumber would have fitted a
combi in those circumstances so have circumstances changed? Did your house
ever receive a better supply pressure? Are your neighbours affected?
If they're not, you may have a problem with you plumbing. Have you checked
that the mains water cock is fully open? Do you have a stopcock in the
street that you can check?
Another simple test you could do is to hold your thumb over the cold tap.
If the pressure builds to the point of forcing past your thumb then it's a
flow restriction you've got rather than a lack of supply pressure.
Tim
Tim
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