I'm trying to work out what you think is happening.
Gravity has naff all to do with the system pressure at the top of a closed system,
Doesn't pressure drop by 1 bar for every 10 metres of vertical distance along the pipe.
I wouldn't necessarily say that pressure drops by 1 bar for every 10m, rather that it takes 1 bar of pressure to raise water vertically by 10M.
A sealed system that is pressurised to 1 bar will generally be 1 bar across the whole system, in a domestic setting, regardless of height.
Correct. And the pressure at the bottom will be higher by an amount proportional to the height of the system. What's your point?Gravity has naff all to do with the system pressure at the top of a closed system
Basic physics. Since water doesn't move by itself, the pump has to push it. Pushing it raises the pressure downstream relative to that upstream.or why the pump will make a difference either.
careful, Dan will be asking you how a pipe knows if it's in a domestic setting or not!A sealed system that is pressurised to 1 bar will generally be 1 bar across the whole system, in a domestic setting, regardless of height.
Not really, not to any real extent anyway, in a sealed domestic system. There is no real volume of stored water pushing down on it, as in the case of a gravity cold water system with a 50gal CWSC above it when an outlet is opened. There may be a small rise in an open vented system but again negligible as the volume in a F&E tank is minimal.And the pressure at the bottom will be higher by an amount proportional to the height of the system
careful, Dan will be asking you how a pipe knows if it's in a domestic setting or not
There is no real volume of stored water pushing down on it
OK, correct though in this scenario it's all semantics, I suppose I should have said weight.The volume of the water in a storage tank or cistern has no effect on the pressure at the outlet pipe, only the depth of liquid above the outlet affects the pressure.
If it really were sealed id agree, but in practice most sealed systems lose water gradually. If it's air rather than water involved, it leaks quicker. That's why they always want to fill your tires with nitrogen, it leaks less throughMicroscopic holes.And the pump? How it drawing air in on a sealed system?
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