In the US for example the standard is 110V for voltage and 80psi for water. In Europe, voltage is 220V, is water pressure different there too?
Afaik water pressure is variable on each city’s design needs.
Does different parts of the world use different standards for water pressure similar to voltages?
Submitted 4 months ago by ramble81@lemm.ee to nostupidquestions@lemmy.world
Comments
someguy3@lemmy.world 4 months ago
NeptuneOrbit@lemmy.world 4 months ago
Everyone else is focusing on whether the rest of the world uses metric and not that fact that water pressure at a given faucet or shower head will be governed by bernoullis equation which will take 99 things into account such as:
The max height of the water reservoir The height of your faucet The design of the pipes leading from the reservoir to your faucet Air pressure The pumps in the system Etc
Thorny_Insight@lemm.ee 4 months ago
And the location of the house/apartment. Houses higher up have lower water pressure and in apartment buildings the upper floors have lower pressure than bottom floors. 1bar of pressure lifts water 10 meters high. When constructing heating lines on a new building we might have the heating on on the first 3 floors despite the ends of the pipes leading to upper floors still being open and half of the building missing. The water wont spray out as long as we keep the pressure low enought that it doesn’t rise to where the pipes end.
neidu2@feddit.nl 4 months ago
Noggie here. Code dictates a minimum of 2Bar (~30psi), but it’s usually between 3-6 bar.
Aux@lemmy.world 4 months ago
Here in the UK the legal minimum is 1 bar per 10m of elevation. But usually the tap will have between 2 and 4 bars of pressure. Older buildings might only have 1 bar ofc. And by older I mean stuff that was built centuries ago and proper modern water supply is impossible to install.
NeoNachtwaechter@lemmy.world 4 months ago
80psi
different there too?
Of course, because psi exists only inside Usa. The real world does not use body parts for measurement anymore ;-)
walter_wiggles@lemmy.nz 4 months ago
I use Torque per cubic foot.
NeoNachtwaechter@lemmy.world 4 months ago
Stork’s foot or crocodile’s?
abcd@feddit.de 4 months ago
My house is operating at around 3,5-4 bar after the pressure regulator. Since I have no gauge I can‘t deliver the pressure of the supply. I guess it is around 6 bar. Small town in Germany.
We also have mandatory check valves since a couple of years to prevent water from entering the supply from the buildings in case the pressure drops.
Spuddlesv2@lemmy.ca 4 months ago
Australia uses kilopascals rather than PSI. Our standard is 500kPa which works out at around 72 PSI.
RightHandOfIkaros@lemmy.world 4 months ago
Not European, but I think they might not use PSI sonce thats Pounds per Square Inch. I believe they use Pascals.
nerdovic@feddit.de 4 months ago
In Germany at least I think th most popular unit is Bar
Sunlightl@fedia.io 4 months ago
Portugal is the same.
ramble81@lemm.ee 4 months ago
Doesn’t really matter the unit of measurement. Kinda like hp/ps or lb-ft/nm, there are equivalents. I’m more interested in the values, but you do have a valid point there.
Aux@lemmy.world 4 months ago
Well, you’re asking about other countries and literally no one knows what PSI is :)
Zwiebel@feddit.org 4 months ago
The most common one is bar. 1 bar is roughly the atmospheric pressure.
An older German unit was atü, 0 atü is atmosperic pressure
itwasawednesday@lemmy.world 4 months ago
So, a hole in a bucket? Doesn’t sound right.
ironhydroxide@sh.itjust.works 4 months ago
Gauge pressure not absolute
Magister@lemmy.world 4 months ago
It’s 120V and 240V
elmicha@feddit.org 4 months ago
It’s 230V in Europe.
Contravariant@lemmy.world 4 months ago
What genius decided to denote the difference by using three shades of the exact same colour?
CorrodedCranium@leminal.space 4 months ago
Is that substantial though or is it like calling 120V something like 110V/115V?
Zwiebel@feddit.org 4 months ago
It doesn’t matter one bit. The actual voltage from the wall varies, and devices are build to operate under a fairly wide margin.
Kaboom@reddthat.com 4 months ago
Hes just being pedantic. Reality is US houses get a +120v and a -120v supply. Combine them is how you get 240v.
Macaroni_ninja@lemmy.world 4 months ago
In europe they mostly use Bars as the unit of measurement.
Mostly water pressure is around 1-2 bars as a minimum, but there are still places using different standards, for example the old style gravity-fed UK watersystems with sub 1 bar pressure, but those are not very common anymore.
Most domestic sanitary products in the EU are designed to be used on 1-5 bar pressure.
I read somewhere the domestic water pressure to be between 4-6 bar, however not sure how realistic it is accross the whole EU and also what you got at the mains and what you got when opening the faucet is two different numbers.
AmidFuror@fedia.io 4 months ago
A bar is 100,000 Pa or 100.000 Pa. Why not use KPa? Why set a separate unit to be 1E+05?
Contravariant@lemmy.world 4 months ago
Because 1 bar is almost atmospheric pressure. Oddly enough I’ve never seen anyone use kPa, weather forecasts often use hPa (instead of mbar) to report atmospheric pressure.
Macaroni_ninja@lemmy.world 4 months ago
No idea what is the story behind it, or if there is a practical reason.
Agility0971@lemmy.world 4 months ago
Will any pressure below 1 bar work at all? Wont it just suck the air in instead?
evasive_chimpanzee@lemmy.world 4 months ago
These pressures are all gauge pressure, not absolute pressure. 1 bar gauge pressure would be about 2 bar absolute.
Thorny_Insight@lemm.ee 4 months ago
1 bar is enought to lift water 10 meters up. The pressure gauges reads zero at atmospheric pressure.
Macaroni_ninja@lemmy.world 4 months ago
The gravity systems are in this case not pressurized. They just have a water tank in the loft/airing cupboard and the hight of the tank determines the pressure. 0.1 bar for every 1 meter height. You open the faucet and gravity pushes out the water.
Its a nightmare, I used to live in UK and these systems are barely enough for anything really.
Brkdncr@lemmy.world 4 months ago
Water operates more like DC voltage so there isn’t really a need for a standard. You just need enough to get to your shower head.
ramble81@lemm.ee 4 months ago
That’s an interesting analogy. But just like too much current can melt a wire, I would assume there’s some upper limits to keep it from bursting pipes and fittings?
Brkdncr@lemmy.world 4 months ago
I think it’s 80psi/20psi to code.