pump for brewery & farm?

[hardrain]

Hi there, here are the details:

350' well, water at 300'.
10-12 gpm (I was told 12, and then "10-12" later, not sure what to make of that)

requirements:
small brewery, would need ~500 gal over the course of 4-5 hours, 2-3 times a week
small dishwasher and two bathrooms at the brewery, likely only used 4 days a week
2 acres of drip irrigation, doesn't all have to run at once (in fact we'd likely do ~1/4 acre at once)...some extensions have said you use about 1000 gal per acre per day. Used ~6 months a year.
2 bedroom house, 2-3 people...this isn't up yet.

My question is both what kind of system you all think is best, and what kind/sized of pump you think would be best.

The complication is that due to some communication issues with the well driller, they've put in a 1hp pump that "can't do constant pressure". I know nothing else about the pump. My builder is suggesting a constant pressure system but I'm not sure of the pros/cons there, or what that means for the pump.

Thanks!

 

[Reach4]

You want to get a water test to see if you need some treatment. This info should include tests for iron, manganese, softness, pH, arsenic, and more. For home use I like kit 90 from http://www.karlabs.com/watertestkit/ For brewing, maybe a more extensive test is warranted.

Lets start with your existing 1 HP pump. With water at 300... 340 ft down, it would probably be a 1HP 5 GPM but it could be a 1 HP 7 GPM pump. The 5 gallon pump would probably deliver as much or more water than the 7 GPM pump. If you were purchasing a new pump, it would probably be something like a 2HP 10 GPM or a 1.5 HP 7 GPM pump.

It seems to me there should be a system to route water to irrigation only when the water pressure is somewhat above the cut-on pressure for the the pump. If that could be done, the house and brewery would get priority on the water. I don't know if such systems are common. I am not a pro.

 

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[Valveman]

From 300' plus 50 PSI a 1HP, 7 GPM series pump will produce 7 GPM. That is only 420 gallon per hour. If you need 10-12 GPM from that depth you will need a 1.5HP in a 10 GPM series pump, and it will produce 600 gallons per hour. The 7 GPM pump would be enough to run the house and a drip system, but probably not both at the same time.

And any pump can be made to do "constant pressure" using a Cycle Stop Valve or CSV. The CSV will do a better job of delivering constant pressure than any of those variable speed type systems, which is what you need a "special" pump to work with.

The Pside-kick kit is all you need to make a constant pressure system out of either the 7 or 10 GPM pump. If you switch the pump to a 1.5HP it will give the installer a chance to install that "special" pump that can be used with a variable speed drive. You DO NOT want the special pump or the variable speed system that are also called a VFD. The CSV will do a better job and not need a special 3 phase motor, which locks you into the VFD type system.

 

[hardrain]

Thanks all, sending off for water testing today, actually.

So it sounds like ideally (with cost not as much of a factor), the recommendation might be a 2HP / 10 GPM, with a CSV if I want constant pressure?

 

[Reach4]

These tables are snipped from a Grundfos 4 inch pump pub. Other similarly rated pumps will have similar characteristics.

 

[Valveman]

The 10 GPM series would be fine in 1.5HP. But if you go with a 2HP I would use a 13 gpm in Goulds, a 15 gpm in a Sta-Rite, or a 16 gpm series in the Grundfos. My preference would be the Grundfos 16S20-18 as it will have a better amp drop at low flow rates when used with the CSV.