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Old 05-07-2010, 11:05 PM   #1
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water pressure regularly goes down


our renter complains that, when he takes a shower, usually 20min long, the water pressure goes down every 5 mins, down to almost nothing, and then comes back again, and drops again in 5 mins. This happens everytime he takes a shower.

What could be the problem? Within the apt, all the pipes have been changed into flex. The city line is still old galvenize.

This city water.

thx


Last edited by hohadcr; 05-08-2010 at 07:06 AM.
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Old 05-08-2010, 12:34 AM   #2
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water pressure regularly goes down


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Originally Posted by hohadcr View Post
our renter complains that, when he takes a shower, usually 20min long, the water pressure goes down every 5 mins, down to almost nothing, and then comes back again, and drops again in 5 mins. This happens everytime he takes a shower.

What could be the problem? Within the apt, all the pipes have been changed into flex. The city line is still old galvenize.

thx
This is city water?

If this was a well I would say that the air pressure in the pressure tank is not right.
If the switch is a 40/60 then there needs to be 38psi of air in the pressure tank, that is checked when there is NO water in the pressure tank.

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Old 05-08-2010, 07:06 AM   #3
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water pressure regularly goes down


well, it is city water...
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Old 05-08-2010, 07:28 AM   #4
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water pressure regularly goes down


If he ran the water in the washbasin does he have the same problem?

There could be a problem in the shower faucet, particularly if there is an anti-scald feature.
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Old 05-08-2010, 10:50 AM   #5
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water pressure regularly goes down


Could be the showerhead or a loose faucet washer.

Measure the flow rate before and during the fault with a bucket and wrist watch.

Then remove the shower head and try again, duplicating the same flow rate without the head on. Then try it at full flow.
I'd expect different flow rates would change the five minute period to something longer or shorter or it may clear the problem entirely.

Is the change abrupt or gradual?

Since this fault can be reliably reproduced there is a good chance you can find the problem.

There are analogies between plumbing and electrical circuits, and the electrical circuit analogy for this is a very low frequency oscillator.

Last edited by Yoyizit; 05-08-2010 at 11:53 AM.
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