Dual sumps

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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"PaulB" wrote in message
m...
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.

You are right in thinking you will only pump what you get via the overflows,
with the momemtary exception of what it in the sump.

What happens when a pump stops.
Overflows reduce flow from 1200 gpm to 600 gpm, but not instantaneously.
You can visualize this as the level in tank will go down slightly and there
will be less water in the overflow plumbing at any instant in time. This
will cause an increase in the water in the sump. (Is the sump big enough?
If it doesn't overflow with both pumps off this is not a concern.)

What happens when one of the overflows plugs.
Sump #1 fill from 600 gpm overflow and pumps 600 gpm. Sump #2 doesn't
fill from overflow and pumps whatever is coming through connecting pipe for
the sumps. You will get 1200 gpm from the two pumps momentarily (possibly
overflowing the tank). Then you may get both pumps cavitating, causing
bubbles and heat.

Just my thoughts. I may be wrong. You should test yourself.

Henry

"Henry Etteldorf" wrote in message
. ..

[snip]
You are right in thinking you will only pump what you get via the
overflows,
with the momemtary exception of what it in the sump.

What happens when a pump stops.
Overflows reduce flow from 1200 gpm to 600 gpm, but not instantaneously.
You can visualize this as the level in tank will go down slightly and
there
will be less water in the overflow plumbing at any instant in time. This
will cause an increase in the water in the sump. (Is the sump big enough?
If it doesn't overflow with both pumps off this is not a concern.)
[/snip]

That really depend on the level on the overflow.
Depending on which or both pump stop.

Since there are two sump with pump, this make it very tricky and
complicated. [This kind of method I strongely NOT RECOMMENDED].


[snip]
What happens when one of the overflows plugs.
Sump #1 fill from 600 gpm overflow and pumps 600 gpm. Sump #2 doesn't
fill from overflow and pumps whatever is coming through connecting pipe
for
the sumps. You will get 1200 gpm from the two pumps momentarily
(possibly
overflowing the tank). Then you may get both pumps cavitating, causing
bubbles and heat.
[/snip]

Sump #1 working = Water will return to the main tank and maintain the water
level of the overflow. From overflow where two pipe is split. Both pipe will
still get water to distination sump #1 and #2. But sump #1 return water back
to tank but not sump #2. Water level still maintain and continue the same
cycle until sump #1 no longer have water to return and water level from the
main tank no longer can overflow to the filter.

Note - where all the water go? All water goto sump #2. Reason, pump from the
sump #2 did not return any water that feed through the pipe.

Eventhough the sump #2 pump stop, there no prevention method or safe guard
from water keep on coming / feeding to any sump.
***[Please note, according previous thread, there no indication of safe
guard or prevention mention. ... like shutoff valve or floating valve etc to
prevent water from coming into sump.]***

2nd note -
Best is to have one sump to hold any water that the main tank provide
according to water level is set from the overflow box. The water level is
set from the overflow water level.

CapFusion,...

Actually, I was planning to have a pipe connecting the two sumps, which
should make them effectively one sump. My problem is figuring out how large
the connecting pipe needs to be. If one pump fails I have 300 GPH coming
down each overflow, so I need 300 gph flow through a horizontal pipe, with
only the pressure of differing water levels to push it through the pipe.

Using two connected sumps will simplify the plumbing and keep the sumps
small enough that they can be removed through the stand doors.




"CapFusion" CapFusion...@hotmail..,com wrote in message
...

"Henry Etteldorf" wrote in message
. ..

[snip]
You are right in thinking you will only pump what you get via the
overflows,
with the momemtary exception of what it in the sump.

What happens when a pump stops.
Overflows reduce flow from 1200 gpm to 600 gpm, but not instantaneously.
You can visualize this as the level in tank will go down slightly and
there
will be less water in the overflow plumbing at any instant in time.
This
will cause an increase in the water in the sump. (Is the sump big
enough?
If it doesn't overflow with both pumps off this is not a concern.)
[/snip]

That really depend on the level on the overflow.
Depending on which or both pump stop.

Since there are two sump with pump, this make it very tricky and
complicated. [This kind of method I strongely NOT RECOMMENDED].


[snip]
What happens when one of the overflows plugs.
Sump #1 fill from 600 gpm overflow and pumps 600 gpm. Sump #2 doesn't
fill from overflow and pumps whatever is coming through connecting pipe
for
the sumps. You will get 1200 gpm from the two pumps momentarily
(possibly
overflowing the tank). Then you may get both pumps cavitating, causing
bubbles and heat.
[/snip]

Sump #1 working = Water will return to the main tank and maintain the
water
level of the overflow. From overflow where two pipe is split. Both pipe
will
still get water to distination sump #1 and #2. But sump #1 return water
back
to tank but not sump #2. Water level still maintain and continue the same
cycle until sump #1 no longer have water to return and water level from
the
main tank no longer can overflow to the filter.

Note - where all the water go? All water goto sump #2. Reason, pump from
the
sump #2 did not return any water that feed through the pipe.

Eventhough the sump #2 pump stop, there no prevention method or safe guard
from water keep on coming / feeding to any sump.
***[Please note, according previous thread, there no indication of safe
guard or prevention mention. ... like shutoff valve or floating valve etc
to
prevent water from coming into sump.]***

2nd note -
Best is to have one sump to hold any water that the main tank provide
according to water level is set from the overflow box. The water level is
set from the overflow water level.

CapFusion,...

1" would do it easily. Larger if you want to.

Marc


PaulB wrote:

Actually, I was planning to have a pipe connecting the two sumps, which
should make them effectively one sump. My problem is figuring out how large
the connecting pipe needs to be. If one pump fails I have 300 GPH coming
down each overflow, so I need 300 gph flow through a horizontal pipe, with
only the pressure of differing water levels to push it through the pipe.

Using two connected sumps will simplify the plumbing and keep the sumps
small enough that they can be removed through the stand doors.


--
Personal Page: http://www.sparklingfloorservice.com/oanda/index.html
Business Page: http://www.sparklingfloorservice.com
Marine Hobbyist: http://www.melevsreef.com

Sounds good. I will go ahead with it.

"Marc Levenson" wrote in message
...
1" would do it easily. Larger if you want to.

Marc


PaulB wrote:

Actually, I was planning to have a pipe connecting the two sumps, which
should make them effectively one sump. My problem is figuring out how
large
the connecting pipe needs to be. If one pump fails I have 300 GPH
coming
down each overflow, so I need 300 gph flow through a horizontal pipe,
with
only the pressure of differing water levels to push it through the pipe.

Using two connected sumps will simplify the plumbing and keep the sumps
small enough that they can be removed through the stand doors.


--
Personal Page: http://www.sparklingfloorservice.com/oanda/index.html
Business Page: http://www.sparklingfloorservice.com
Marine Hobbyist: http://www.melevsreef.com

use at least a 2 inch pipe.
It won't cost much extra and can cope with 4 times the flow of a 1 inch
pipe.
An over flow box might be an option also these will work the same in
both directions but with sump levels being dynamic it might be too risky
for your purpose.

Simon


PaulB wrote:

Sounds good. I will go ahead with it.

"Marc Levenson" wrote in message
...


1" would do it easily. Larger if you want to.

Marc


PaulB wrote:



Actually, I was planning to have a pipe connecting the two sumps, which
should make them effectively one sump. My problem is figuring out how


large


the connecting pipe needs to be. If one pump fails I have 300 GPH


coming


down each overflow, so I need 300 gph flow through a horizontal pipe,


with


only the pressure of differing water levels to push it through the pipe.

Using two connected sumps will simplify the plumbing and keep the sumps
small enough that they can be removed through the stand doors.



--
Personal Page: http://www.sparklingfloorservice.com/oanda/index.html
Business Page: http://www.sparklingfloorservice.com
Marine Hobbyist: http://www.melevsreef.com

"PaulB" wrote in message
m...
Actually, I was planning to have a pipe connecting the two sumps, which
should make them effectively one sump. My problem is figuring out how
large
the connecting pipe needs to be. If one pump fails I have 300 GPH coming
down each overflow, so I need 300 gph flow through a horizontal pipe, with
only the pressure of differing water levels to push it through the pipe.

Using two connected sumps will simplify the plumbing and keep the sumps
small enough that they can be removed through the stand doors.


Humm... ok. Connecting two sump with a pip should be fine. It is better then
two separate sump. The size of return pipe, my guess would be [maybe] 1" or
so. Maybe Marc can give better size recommendation since he much better
knowledge in this area.

CapFusion,...