Dave, A reasonable flow velocity for these sizes would be between 3 and 8 feet per second, say 5:
D feet/s CPM L 10 inch 5 163 1.14 12 1nch 5 235 0.94 D is diameter CPM is cubic feet per minute L loss of head in feet per 100 feet of pipe With these flow rates you have a head loss of a few inches (Lx22)/100. Hope this helps, Regards, Martin Leahy -----Original Message----- From: Dave [mailto:[EMAIL PROTECTED] Sent: 27 May 2004 02:30 To: [EMAIL PROTECTED] Subject: [microhydro] Re: 10 & 12 inch penstock question I repeat the question, but this time can someone answer it with or without promoting their PC software? > > Can anybody help me figure how many gallons per minute will flow thru > > both a 10 inch and 12 inch penstock that is 22 feet long that has a 6 > > foot 8 inch head without any turbine? The penstock will have one 90 > > degree bend and a 3 foot draft tube. I trying to determine what size > > will be ideal to replace the existing 8.25 inch penstock before i > > size a turbine that sizes the penstock. Thanx > > > > 1. > This now the fifth time since October last year that I advise the group that > SF Pressure Drop 5.0 [available at http://www.pressure-drop.com/] makes it easy > to do any pipe friction/pressure drop calculation imaginable. Does your company feature in the microhydro business directory at http://microhydropower.net/directory ? If not, please register free of charge and be exposed to the microhydro community world wide! NOTE: The advertisements in this email are added by Yahoogroups who provides us with free email group services. The microhydro-group does not endorse products or support the advertisements in any way. More information on micro hydropower at http://microhydropower.net To unsubscribe: send empty message to [EMAIL PROTECTED] Yahoo! Groups Links ------------------------ Yahoo! Groups Sponsor --------------------~--> Make a clean sweep of pop-up ads. Yahoo! Companion Toolbar. Now with Pop-Up Blocker. Get it for free! http://us.click.yahoo.com/L5YrjA/eSIIAA/yQLSAA/FGYolB/TM --------------------------------------------------------------------~-> Does your company feature in the microhydro business directory at http://microhydropower.net/directory ? If not, please register free of charge and be exposed to the microhydro community world wide! NOTE: The advertisements in this email are added by Yahoogroups who provides us with free email group services. The microhydro-group does not endorse products or support the advertisements in any way. More information on micro hydropower at http://microhydropower.net To unsubscribe: send empty message to [EMAIL PROTECTED] Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/microhydro/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
