Posted by Spacey Spade on July 19, 2009, 11:09 pm
If your house water pressure is too high, is it good enough to reduce the
dynamic water pressure by partially shutting the incoming valve from the
city? This would leave the static pressure at the city pressure, but the
restriction in flow would reduce dynamic pressure. What can damage water
heaters, dishwashers, washing machines, faucets, etc: dynamic or static
water pressure? Or both?
Posted by Rod Speed on July 20, 2009, 12:53 am
Spacey Spade wrote:
> If your house water pressure is too high, is it good
> enough to reduce the dynamic water pressure by
> partially shutting the incoming valve from the city?
Depends on why you have decided that your house water pressure is too high.
If its just too high when being used, partially shutting the incoming
valve will certainly help, but that isnt a very common situation.
> This would leave the static pressure at the city pressure,
> but the restriction in flow would reduce dynamic pressure.
> What can damage water heaters, dishwashers, washing machines,
> faucets, etc: dynamic or static water pressure? Or both?
Static is the main problem, because the dynamic is always lower.
Posted by Spacey Spade on July 21, 2009, 5:54 pm
On Mon, 20 Jul 2009 14:53:41 +1000, Rod Speed wrote:
> Spacey Spade wrote:
>
>> If your house water pressure is too high, is it good
>> enough to reduce the dynamic water pressure by
>> partially shutting the incoming valve from the city?
>
> Depends on why you have decided that your house water pressure is too high.
>
> If its just too high when being used, partially shutting the incoming
> valve will certainly help, but that isnt a very common situation.
>
>> This would leave the static pressure at the city pressure,
>> but the restriction in flow would reduce dynamic pressure.
>> What can damage water heaters, dishwashers, washing machines,
>> faucets, etc: dynamic or static water pressure? Or both?
>
> Static is the main problem, because the dynamic is always lower.
Ok, I want to understand how static pressure works at reducing the life of
appliances. How does it slowly damage them? (assume that making them burst
is not an issue).
Posted by Rod Speed on July 21, 2009, 6:49 pm
Spacey Spade wrote
> Rod Speed wrote
>> Spacey Spade wrote
>>> If your house water pressure is too high, is it good
>>> enough to reduce the dynamic water pressure by
>>> partially shutting the incoming valve from the city?
>> Depends on why you have decided that your house water pressure is too high.
>> If its just too high when being used, partially shutting the incoming
>> valve will certainly help, but that isnt a very common situation.
>>> This would leave the static pressure at the city pressure,
>>> but the restriction in flow would reduce dynamic pressure.
>>> What can damage water heaters, dishwashers, washing machines,
>>> faucets, etc: dynamic or static water pressure? Or both?
>> Static is the main problem, because the dynamic is always lower.
> Ok, I want to understand how static pressure works at reducing the life of
appliances.
The hoses can fail to withstand the higher pressure over the long haul,
essentially because they are designed with a maximum pressure rating.
> How does it slowly damage them? (assume that making them burst is not an
issue).
It is actually one of the most important issues particularly with flexible hoses.
A flood can be a significant problem.
Even an unobserved leak can be too.
Posted by Vic Smith on July 21, 2009, 7:03 pm
On Tue, 21 Jul 2009 16:54:05 -0500, Spacey Spade
>Ok, I want to understand how static pressure works at reducing the life of
>appliances. How does it slowly damage them? (assume that making them burst
>is not an issue).
You can't separate static and dynamic pressure when opening/closing a
valve, which happens all the time in appliances.
If a valve is designed to close against 60 psi static from 20 psi
dynamic, its parts will be unduly strained each time it has to push
against 100 psi static.
Besides, all valves use seals, and the seals and seal retainers are
designed to withstand specific pressures.
--Vic
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> enough to reduce the dynamic water pressure by
> partially shutting the incoming valve from the city?