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volcano
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pressure tank
is it possible to use a pressure tank to boost water pressure in a gravity flow
situation without the use of power or pump?
[Edited on 3-6-2012 by volcano]
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Sandlefoot
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Sure! If you let the gravity fill the tank before you pressurize it. Then you have to add more water each time you need it without any pressure in
the tank then re-pressurize again...& again...& again...till you get so tired of it that you put in a pump in line and forget it.
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Ateo
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Contact the Department of Industrial Relations Pressure Vessel Unit and ask their opinion..............haha.
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volcano
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I'm the gal that just got waterline in to cabana, slight gravity situation, and no power yet nor for a while...............might as well live in a
cave
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comitan
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NO !
Strive For The Ideal, But Deal With What\'s Real.
Every day is a new day, better than the day before.(from some song)
Lord, Keep your arm around my shoulder and your hand over my mouth.
“The sincere pursuit of truth requires you to entertain the possibility that everything you believe to be true may in fact be false”
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J.P.
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Sounds like yuo may need a hand pump, or elevate the tank
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Islandbuilder
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You can't get more pressure than you have head, without introducing it from an outside source such as a pump.
I don't see any way to get higher pressure without raising the height of the tank or using a pump. Lots of ways to get pressure short of an electric
pump. I guess it depends how long before you get your electical system going as to how much energy to put into an alternate.
A small wind powered pump may be worth looking into.
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Terry28
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If you have a long enough run consider graduated pipe.....bigger to smaller..
Mexico!! Where two can live as cheaply as one.....but it costs twice as much.....
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Mulegena
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| Quote: | Originally posted by Terry28
If you have a long enough run consider graduated pipe.....bigger to smaller.. |
This is a great idea, Terry,
at least in theory.
Got any specs on that for reference, plz?
"Raise your words, not your voice. It's rain that grows flowers, not thunder." ~Rumi
"It's the mark of an educated mind to be able to entertain a thought without accepting it." ~ Aristotle
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KaceyJ
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Basically No.
The maximum gain you can accomplish with gravity feed is the number of feet of elevation above the faucet /fixture in your home that the water source
comes from.
Appx. .43 lb. / ft. elevation pressure
ie , if the highest elevation of the source is 10 feet above your shower head then you will have 4.3 lbs. pressure.
A pressure tank adds air pressure over stored water to boost pressure and requires energy to do so .
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volcano
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.............. thanks for the educated answers..clearly I'm going to need a pump eventually. no neighbors
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comitan
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If you gave 12V consider an RV pump.
Strive For The Ideal, But Deal With What\'s Real.
Every day is a new day, better than the day before.(from some song)
Lord, Keep your arm around my shoulder and your hand over my mouth.
“The sincere pursuit of truth requires you to entertain the possibility that everything you believe to be true may in fact be false”
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larryC
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| Quote: | Originally posted by Terry28
If you have a long enough run consider graduated pipe.....bigger to smaller.. |
And what do you accomplish by going to a smaller diameter pipe other than reduce your flow?
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Islandbuilder
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| Quote: | Originally posted by larryC
| Quote: | Originally posted by Terry28
If you have a long enough run consider graduated pipe.....bigger to smaller.. |
And what do you accomplish by going to a smaller diameter pipe other than reduce your flow? |
Yeah, it's one of those things that seem to make sense, like putting your finger over the end of a hose to spray your walkway. Until you do it. You
can't make more pressure, just reduce and concentrate the flow.
With very low pressure, ALL you have is volumn, so less pressure equals more water used. A pain when you have to haul it in, and therefore spending a
bit to get at least one panel, one battery and a $75 12 volt RV or Marine pressure pump is justified.
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greengoes
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| Quote: | Originally posted by larryC
| Quote: | Originally posted by Terry28
If you have a long enough run consider graduated pipe.....bigger to smaller.. |
And what do you accomplish by going to a smaller diameter pipe other than reduce your flow? |
Nothing else, it is a misconception that pressure increases as it passes into a smaller pipe.
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volcano
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12 v
| Quote: | Originally posted by comitan
If you gave 12V consider an RV pump. |
yes. and I actually have other 2v questions.
we may be able to do a slar panel or 2 next year. the cabin is small, and we will only want a few lights, tv satellite dish. thought I would look
for an rv set up. 12 v is the way to go for our needs, right? not 110/solar....we are way off grid
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Islandbuilder
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My limited experience would say that yes, with some reservations.
!2V takes heavier wire than does 120V to avoid resistance voltage loss , so if you have long runs, or a lot electrical stuff, the wire cost can get
high.
I guess you could always use a small point of use inverter if you ever wanted to add a small microwave?
I suggest a single 12v battery, and a solar trickle charger hooked directly to the battery for running your pressure pump until you get your larger
solar system sorted out.
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Islandbuilder
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| Quote: | Originally posted by soulpatch
And if dollars/pesos right now are the issue you can hook it right to your vehicle battery.
A small, cheap cigarette lighter solar panel would keep you ahead of the game until you were able to afford a more permanent solution.
It'd be down and dirty but you'd be able to rinse off. |
There ya go, best short term advice yet!
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David K
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| Quote: | Originally posted by greengoes
| Quote: | Originally posted by larryC
| Quote: | Originally posted by Terry28
If you have a long enough run consider graduated pipe.....bigger to smaller.. |
And what do you accomplish by going to a smaller diameter pipe other than reduce your flow? |
Nothing else, it is a misconception that pressure increases as it passes into a smaller pipe. |
CORRECTAMUNDO! Smaller pipe actually reduces pressure (because there is more friction).
Pressure is created by elevation or a pump. The higher up the water source, the more pressure (force) it will have (.433 lbs. per ft. of elevation).
If you can't get the water supply higher, then adding a booster bump/ pressure tank is the cure.
Flow is determined by the pipe size. A bigger pipe can flow more gallons at the same time as a smaller pipe can. Bigger pipe has less friction and
less loss of pressure than a smaller pipe moving the same gallons.
Velocity (speed) is increased by reducing pipe size, but pressure (force) is reduced. Water cannot be compressed (as air can), so you can't 'squeeze'
the water to create pressure. The water needs to move faster in a smaller pipe to move the same gallons through a big pipe. If the pressure is high,
and you open and close a valve at the end of a small pipe, the pipe will shake or a hose will move. Velocity is the enemy... cured by either reducing
the flow, reducing the pressure, or increasing the pipe size.
Some people get velocity and pressure mixed up, and think that making water run through a smaller opening helps with pressure... but it only makes the
water move faster... this is how sprinklers can 'throw' water up to 30 feet even if the pressure is only 40 pounds per square inch (PSI)... Which is
on the low side for most home applications that use more water (per minute) than a sprinkler.
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Alan
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| Quote: | Originally posted by Terry28
If you have a long enough run consider graduated pipe.....bigger to smaller.. |
I think that would simply
increase the friction loss. You are stuck with existing head pressure without a pump.
In Memory of E-57
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