The overflows are rated at 600 gph each. With 2 600 gph pumps, I am
assuming that with one pump off, there will be 600 gph total flow, 300 gph
through each overflow leaving 300 to travel through the pipe connecting the
two sumps.

The pumps are rated at 600 gph @ 6' head.



"Marc Levenson" wrote in message
...
If you have two 600gph pumps, total flow is 1200gph at zero head pressure.
If
one pump fails, you'll still be moving 600gph, not 300gph.

Will your tank drain 1200gph?

Marc


PaulB wrote:

I will be using 2 600 gph pumps. I figure on 300 GPH between sumps
because
if one pump is off, half the water flow will continue to come down each
overflow. I am planning on having the sumps about 3' apart.

How much flow did you have going through the 2" pipe?

"Rod" wrote in message
...
I used to have 2 sumps chained together (on th esame level), but I
only
used 1
pump although using 2 is a better idea (if one fails the other is
still
pumping). I wanted all of my water to pass through the first sump
then to
th
esecond via a 2" pipe. A 2" pipe was not big enough, I had to divert
some
of
the water coming from the main tank into the second sump. if you aere
using 2
300 gph pumps with one in each sump, you _might be OK with 1", but as
Mark
said
1.5 would be better.


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