Hi. I have a 1500 gal water tank that will be supplying water to my cabin. The tank will be sitting 15' above ground level. I know this will not produce enough pressure for the cabin which has 2 sinks, 1 shower, 1 toilet, and a washer. I think I need to install a booster pump and pressure tank to get the proper water pressure for the cabin. My questions are: what type of pump do I need, what size pressure tank to use, and how to set it up. Also should this setup be placed close to the cabin or near the water tank that is about 30' from the cabin. The water tank will be filled by a water supplier whenever it is low. Any suggestions and help will greatly be appreciated. Thank you very much. --Scott

I'll put up a diagram for you to follow. Check out Booster pumps at: booster pumps for water pressure - Google Search (http://www.google.com/search?sourceid=navclient&aq=1&oq=Booster+Pumps&ie=UTF-8&rlz=1T4GGLM_enUS380US380&q=booster+pumps+for+water+pressure)
Where you will find a selection of booster pumps designed to 8increase pressure. If you have more questions I'm as close as a click. Good luck, Tom

Another good site.

Water pressure booster pump and tank guide (http://www.inspectapedia.com/water/Booster_Pumps.htm)

Also, check out Grundfos MQ series pumps. It is an on demand pump and requires no pressure tank or any extra components. Would be ideal for your situation. Let me know what you think.

pressure tank size for the following
pump 2 l/s cut in=4bar cut out=5bar
pump 6l/s cut in =4bar cut out=5bar

equation&calculations please

Nabil, you're in the metric system, so I'm having to do some converting here. 1 bar= about 15 psi, so your pump is cutting in at about 60# and out at 75#. I assume you mean a pump that is delivering 2 liters per second, which is about 1/2 gallon, or 30 gpm. Your second example is 90 gpm, which is a big pump. I assume this is not for a house but something larger. Would that be correct?

This site might help a little. But if 90 gpm is correct, you are talking about a very large application which is way past my experience.

http://www.watersystemscouncil.org/VAiWebDocs/WSCDocs/9884303Sizing_a_Pressure_Tank_FINAL.pdf