|
|
|
|
|
#1
01-05-2012, 11:34 PM
|
|||||
|
|||||
I agree, reducing the pipe size on the suction side can and usually does cause cavitation, which will destroy the impellar.
__________________
Crap happens, that's why they sell toilet paper in 48 roll packs! 
|
|
#2
01-05-2012, 11:49 PM
|
|||||
|
|||||
|
you'll loose some head reducing the outlet from 2" to 1.5", might get some idea of how much from RC's headloss calculator
probably not a whole lot of cost or effort difference though just sticking with 2"
__________________
my tank
|
|
#3
01-05-2012, 11:54 PM
|
||||
|
||||
|
No, probably not a lot of cost...just was trying to save a little space. Plus I didn't figure the pump was actually pushing the entire 2" pipe full of water all the way up the pipe, but maybe it does.
I don't plan on restricting the input. My sump has a 2" bulkhead hole cut to connect to the Reeflo.
__________________
Mark...  290g Peninsula Display, 425g total volume. Setup Jan 2013.
|
|
#6
01-13-2012, 11:00 PM
|
||||
|
||||
|
reducing output
Reducing the output from 2" to 1-1/2" will cause the pump to work harder to pump the water up. The further away from the pump the reduction is the better.
Putting a reducer in is equivalent to increasing the head pressure and will greatly reduce the flow rate. From 2| to 1-1/2" pipe you will reduce the max possible flow (at the same pressure) by about 40%. (flow is proportional to pressure x area)
|
|
#7
01-13-2012, 11:21 PM
|
|||||
|
|||||
|
While friction losses are definitely increased with reduction in pipe size the amount is also dependent on flow rate. So to say one will experience a 40% reduction is not correct.
Chances are with you branching off some flow prior to going upstairs you won't even notice a difference between 1.5 & 2". 1.5" sounds like the right size to me.
|
Hybrid Mode
