Four-nozzle Stream Engine at low head? [RE-wrenches]

[Doug Pratt]

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Hi Gary. Ah yes, the lads at ES&D would really like to sell you a 2nd
turbine at high flows. The Stream Engine *will* support flows up to 300 gpm,
but at flows above 150 gpm all that water starts getting in it's own way, so
you aren't getting everything you could. Also, with only 20 feet of head
you'll probably only be able to stuff 200 to 225 gpm into it. Will a single
turbine make enough power for this owner? If so, then no problem, go for it.
If the wattage is looking a bit scant, then you'd do better to run less
water per turbine and use a pair. The output figures from ES&D are pretty
honest (based on fairly limited feedback I've heard over the years).

Cheers,
Doug Pratt

-----Original Message-----
From: Gary Higbee [mailto:gary at windstreamsolar.com] 
Sent: Tuesday, April 19, 2005 1:36 PM
To: RE-wrenches at topica.com
Subject: Four-nozzle Stream Engine at low head? [RE-wrenches]


Wrenches,

I'm working a hydro site that has about 20' of head, and an available flow 
of up to about 250 gallons per minute (we're likely using 6" pipe). A 
four-nozzle Stream Engine would seem to be a good choice, but ES&D suggests 
using a pair of two-nozzle units for the highest efficiency. Sounds good, 
but that's a heck of a lot of money. I used a four-nozzle on a lowish head 
system some years ago, but unfortunately don't remember the numbers.

Do any of you have first-hand knowledge that would suggest we'd be OK in the

200-250 gpm range with a four-nozzle unit at 20' of head? Any numbers?

While we're on this have you found that the published power numbers for the 
Stream Engine agree with your installed readings?

Thanks!

Gary

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