If it was me I would use 2 1" or 1 1 1/2". 1 1/2 pipe is a ton of flow 2 1" pipes flow less than 1 1 1/2" pipe You would be between the 2 charts you will have more than 6' of fall. Alsoa full pipe makes less noise something to keep in mind
[TABLE]
[TR]
[TD="align: center"][/TD]
[TD="align: center"][/TD]
[TD="align: center"][/TD]
[TD="bgcolor: #80ff80, colspan: 2, align: center"][SIZE=-1]Assume Gravity to Low Pressure. About 6f/s flow velocity, also suction side of pump[/SIZE][/TD]
[TD="bgcolor: #ffff00, colspan: 2, align: center"][SIZE=-1]Assume Average Pressure. (20-100PSI) About 12f/s flow velocity[/SIZE][/TD]
[TD="bgcolor: #ff4343, colspan: 2, align: center"][SIZE=-1]Assume "High Pressure" PEAK flow. About 18f/s flow velocity[SUP]*[/SUP][/SIZE][/TD]
[/TR]
[TR]
[TD="align: center"]Sch 40 Pipe Size[/TD]
[TD="align: center"]ID
(range)[/TD]
[TD="align: center"]OD[/TD]
[TD="bgcolor: #80ff80, align: center"]GPM[SIZE=-2]
(with minimal pressure loss & noise)[/SIZE][/TD]
[TD="bgcolor: #80ff80, align: center"]GPH[SIZE=-2]
(with minimal pressure loss & noise)[/SIZE][/TD]
[TD="bgcolor: #ffff00, align: center"]GPM[SIZE=-2]
(with minimal pressure loss & noise)[/SIZE][/TD]
[TD="bgcolor: #ffff00, align: center"]GPH[SIZE=-2]
(with minimal pressure loss & noise)[/SIZE][/TD]
[TD="bgcolor: #ff4343, align: center"]GPM[SIZE=-2]
(with significant pressure loss & noise)[/SIZE][/TD]
[TD="bgcolor: #ff4343, align: center"]GPH[SIZE=-2]
(with significant pressure loss & noise)[/SIZE][/TD]
[/TR]
[TR]
[TD]1/2"[/TD]
[TD].50-.60"[/TD]
[TD].85"[/TD]
[TD="bgcolor: #80ff80"]7 gpm[/TD]
[TD="bgcolor: #80ff80"]420 gph[/TD]
[TD="bgcolor: #ffff00"]14 gpm[/TD]
[TD="bgcolor: #ffff00"]840 gph[/TD]
[TD="bgcolor: #ff4343"]21 gpm[/TD]
[TD="bgcolor: #ff4343"]1,260 gph[/TD]
[/TR]
[TR]
[TD]3/4"[/TD]
[TD].75-.85"[/TD]
[TD]1.06"[/TD]
[TD="bgcolor: #80ff80"]11 gpm[/TD]
[TD="bgcolor: #80ff80"]660 gph[/TD]
[TD="bgcolor: #ffff00"]23 gpm[/TD]
[TD="bgcolor: #ffff00"]1,410 gph[/TD]
[TD="bgcolor: #ff4343"]36 gpm[/TD]
[TD="bgcolor: #ff4343"]2,160 gph[/TD]
[/TR]
[TR]
[TD]1"[/TD]
[TD]1.00-1.03"[/TD]
[TD]1.33"[/TD]
[TD="bgcolor: #80ff80"]16 gpm[/TD]
[TD="bgcolor: #80ff80"]960 gph[/TD]
[TD="bgcolor: #ffff00"]37 gpm[/TD]
[TD="bgcolor: #ffff00"]2,220 gph[/TD]
[TD="bgcolor: #ff4343"]58 gpm[/TD]
[TD="bgcolor: #ff4343"]3,510 gph[/TD]
[/TR]
[TR]
[TD]1.25"[/TD]
[TD]1.25-1.36"[/TD]
[TD]1.67"[/TD]
[TD="bgcolor: #80ff80"]25 gpm[/TD]
[TD="bgcolor: #80ff80"]1,500 gph[/TD]
[TD="bgcolor: #ffff00"]62 gpm[/TD]
[TD="bgcolor: #ffff00"]3,750 gph[/TD]
[TD="bgcolor: #ff4343"]100 gpm[/TD]
[TD="bgcolor: #ff4343"]5,940 gph[/TD]
[/TR]
[TR]
[TD]1.5"[/TD]
[TD]1.50-1.60"[/TD]
[TD]1.90"[/TD]
[TD="bgcolor: #80ff80"]35 gpm[/TD]
[TD="bgcolor: #80ff80"]2100 gph[/TD]
[TD="bgcolor: #ffff00"]81 gpm[/TD]
[TD="bgcolor: #ffff00"]4,830 gph[/TD]
[TD="bgcolor: #ff4343"]126 gpm[/TD]
[TD="bgcolor: #ff4343"]7,560 gph[/TD]
[/TR]
[TR]
[TD]2"[/TD]
[TD]1.95-2.05"[/TD]
[TD]2.38"[/TD]
[TD="bgcolor: #80ff80"]55 gpm[/TD]
[TD="bgcolor: #80ff80"]3300 gph[/TD]
[TD="bgcolor: #ffff00"]127 gpm[/TD]
[TD="bgcolor: #ffff00"]7,650 gph[/TD]
[TD="bgcolor: #ff4343"]200 gpm[/TD]
[TD="bgcolor: #ff4343"]12,000 gph[/TD]
[/TR]
[TR]
[TD]2.5"[/TD]
[TD]2.35-2.45"[/TD]
[TD]2.89"[/TD]
[TD="bgcolor: #80ff80"]80 gpm[/TD]
[TD="bgcolor: #80ff80"]4800 gph[/TD]
[TD="bgcolor: #ffff00"]190 gpm[/TD]
[TD="bgcolor: #ffff00"]11,400 gph[/TD]
[TD="bgcolor: #ff4343"]300 gpm[/TD]
[TD="bgcolor: #ff4343"]17,550 gph[/TD]
[/TR]
[TR]
[TD]3"[/TD]
[TD]2.90-3.05"[/TD]
[TD]3.50"[/TD]
[TD="bgcolor: #80ff80"]140 gpm[/TD]
[TD="bgcolor: #80ff80"]8400 gph[/TD]
[TD="bgcolor: #ffff00"]273 gpm[/TD]
[TD="bgcolor: #ffff00"]16,350 gph[/TD]
[TD="bgcolor: #ff4343"]425 gpm[/TD]
[TD="bgcolor: #ff4343"]25,650 gph[/TD]
[/TR]
[TR]
[TD]4"[/TD]
[TD]3.85-3.95"[/TD]
[TD]4.50"[/TD]
[TD="bgcolor: #80ff80"]240 gpm[/TD]
[TD="bgcolor: #80ff80"]14,400 gph[/TD]
[TD="bgcolor: #ffff00"]480 gpm[/TD]
[TD="bgcolor: #ffff00"]28,800 gph[/TD]
[TD="bgcolor: #ff4343"]700 gpm[/TD]
[TD="bgcolor: #ff4343"]42,000 gph[/TD]
[/TR]
[TR]
[TD]5"[/TD]
[TD]4.95-5.05"[/TD]
[TD]5.563"[/TD]
[TD="bgcolor: #80ff80"]380 gpm[/TD]
[TD="bgcolor: #80ff80"]22,800 gph[/TD]
[TD="bgcolor: #ffff00"]750 gpm[/TD]
[TD="bgcolor: #ffff00"]45,000 gph[/TD]
[TD="bgcolor: #ff4343"]1100 gpm[/TD]
[TD="bgcolor: #ff4343"]66,000 gph[/TD]
[/TR]
[TR]
[TD]6"[/TD]
[TD]5.85-5.95"[/TD]
[TD]6.61"[/TD]
[TD="bgcolor: #80ff80"]550 gpm[/TD]
[TD="bgcolor: #80ff80"]33,000 gph[/TD]
[TD="bgcolor: #ffff00"]1100 gpm[/TD]
[TD="bgcolor: #ffff00"]66,000 gph[/TD]
[TD="bgcolor: #ff4343"]1700 gpm[/TD]
[TD="bgcolor: #ff4343"]102,000 gph[/TD]
[/TR]
[TR]
[TD]8"[/TD]
[TD]7.96"[/TD]
[TD]8.625"[/TD]
[TD="bgcolor: #80ff80"]950 gpm[/TD]
[TD="bgcolor: #80ff80"]57,000 gph[/TD]
[TD="bgcolor: #ffff00"]1900 gpm[/TD]
[TD="bgcolor: #ffff00"]114,000 gph[/TD]
[TD="bgcolor: #ff4343"]2800 gpm[/TD]
[TD="bgcolor: #ff4343"]168,000 gph[/TD]
[/TR]
[/TABLE]
[HR][/HR]