here's that bookmark I was looking for
http://www.engineeringtoolbox.com/pressure-loss-plastic-pipes-d_404.html
10 gpm in 1-1/4" pipe gives 1.6 per 100' of pipe, 1.6 x 7 = 11, so your corrected head height for the friction loss in 700' of pipe is 50+11 = 66'.
It looks like the BF-1007 from the previously posted link will do 17 GPM at 66' head height.
One of the 5 GPM pumps may also work but the lines on the graph don't extend that far. The BF-0515 looks like it would just do 10 GPM at 66' if you extend the line, so you might want a slightly larger 5 GPM pump, but ask the manuf. first. He might have a good reason for not extending those lines to 10 GPM; maybe it shortens pump motor service lifetime.
Now the problem becomes sizing pumps and pipes for the minimum cost at reasonable pump lifetime that still meets your spec's. A spreadsheet comes in handy to keep track of all this nonsense.
Piece o' cake!
http://www.engineeringtoolbox.com/pressure-loss-plastic-pipes-d_404.html
10 gpm in 1-1/4" pipe gives 1.6 per 100' of pipe, 1.6 x 7 = 11, so your corrected head height for the friction loss in 700' of pipe is 50+11 = 66'.
It looks like the BF-1007 from the previously posted link will do 17 GPM at 66' head height.
One of the 5 GPM pumps may also work but the lines on the graph don't extend that far. The BF-0515 looks like it would just do 10 GPM at 66' if you extend the line, so you might want a slightly larger 5 GPM pump, but ask the manuf. first. He might have a good reason for not extending those lines to 10 GPM; maybe it shortens pump motor service lifetime.
Now the problem becomes sizing pumps and pipes for the minimum cost at reasonable pump lifetime that still meets your spec's. A spreadsheet comes in handy to keep track of all this nonsense.
Piece o' cake!
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