Using the performance chart located at www.fancykoioutlet.com with a static
head of 5 foot and assuming that pipe, valves, elbows, filter head, etc. is
equivalent to 100 foot of pipe, a 2 inch pipe will give about 80 gallon per
minute, while the 3 inch will give about 100 gallon per minute. It the
equivalent length of pipe were 50 foot the flow 3" pipe would have almost no
difference, while the 2 inch pipe would yield a flow of about 95 gallons per
minute.

As you can see, the pipe diameter, number of fittings, length of pipe,
filter components, and other factors. If your plumbing is mostly straight
runs with a minimum of elbows, valves, tees, based on your schematic and my
approximation of distances based on the block counts, you may be able to get
the equivalent length down to about 30 foot, but with many fittings, it
could go as high as 100 foot since each elbow is equivalent to about 4 foot
of pipe and each valve (fully open is equivalaent to about 2 foot of pipe.
--
RichToyBox
http://www.geocities.com/richtoybox/index.html

"Grumpy" wrote in message
news:qFRWc.38848$9d6.21590@attbi_s54...
All I really want to know is, is it worth going to a 3 inch pipe from a
1 1/2 inch port from the filter.

Andy Hill wrote:

Grumpy wrote:

Benign Vanilla wrote:


"gng" wrote in message
...


I have a Sequence 7200 and Aqua Ultima filter. The original guy who
built
this used 1.5 inch, but when you do the math you actually get nearly
twice
the water with 2" pipe. Been told the intake is the most important
place

to


have the larger pipe. Sequence told me to use 3" if I could for even
more
flow.

snip

I would agree. Never restrict the input to your pump.
BV.


The 3" to the input is no problem. The bottom drain and skimmer are
plumbed for 3". It's the output I have concern for. I want as much flow
as possible to the falls. Will I be able to do 3" from the Ultima?
Thanks


The pump doesn't give a rip what your pipe diameter is, all it cares
about is
the static and dynamic head. Bigger pipe gives you a smaller dynamic
head for
a given flow rate. You *might* run into the situation where the system
is
overdesigned (dynamic head is so low that static head is all the pump is
pushing
against), but I doubt you'll run into that situation with only 3" pipe.
If you
want to be sure, figure out the system's dynamic head from the tables
referenced
in Richard's post, and check against the flow curves for your pump.