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Old    Mispella (jon43)      Join Date: Aug 2003       08-08-2007, 1:28 PM Reply   
I am redoing my ballast system. I use 4 simer bw85 pumps what size thru hull would you all recommend?
Old    Chris Watson (watsoc)      Join Date: Apr 2005       08-08-2007, 2:32 PM Reply   
Are you planning to have a single through hull with a tee system set up to feed each pump or are you planning to have a dedicated through hull for each pump. I have (2) 3/4" through hulls dedicated to each of my Jabsco Ballast Puppies. If you only want one through hull then you will want the largest size which I think is a 1 1/4" and then build a PVC Tee system that allows you to give a dedicated intake for each Simer pump. The 1 1/4" intake is expensive and so is the 1 1/4" ball valves and everything else you need to make a viable through hull connection. I chose to do (2) 3/4" intakes because it was more cost effective and actually gave me the capability to intake more water since my total connections is actually 1 1/2" of total intake. Just my 2 cents.
Old    Mispella (jon43)      Join Date: Aug 2003       08-08-2007, 2:55 PM Reply   
ya, it is set up right now with one thru hull (3/4" strainer)that is plumbed to a manifold that distributes the water to 4 harbor freight marine pumps (crap) but they work. I am changing it for a couple of reasons 1. speed I want to fill and empty quickly each bag. 2. because I don't think the pumps are getting enough water (they kinda gurgle with lots of air). so I am looking to re plumb the intake and I do not want to starve the pumps. 1 1/4" is what the engine has and I was planning on using that size. does anyone think it is to small for 4 pumps (simer bw85).
Old    Nacho (denverd1)      Join Date: May 2004       08-08-2007, 3:16 PM Reply   
i dont' the flow rate yada yada on those pumps but they make 1 1/2" THulls
Old    Mispella (jon43)      Join Date: Aug 2003       08-08-2007, 3:20 PM Reply   
600 gph 10 gpm
Old    Mispella (jon43)      Join Date: Aug 2003       08-09-2007, 4:00 AM Reply   
Old    Mispella (jon43)      Join Date: Aug 2003       08-09-2007, 4:10 AM Reply   
for the record it is not 4:00am it is early though.
Old    Stan Tanner (sbt3)      Join Date: Jun 2002       08-09-2007, 4:36 AM Reply   
I have 3 simers running off my fresh water intake on my boat. The hose is only 1" and that also feeds the engine. I haven't had any problems and I have had this setup for 3 years now. I can fill at idle or full speed it doesn't matter and the temp on the boat stays the same and the pumps don't starve as far as I can tell.
Old    Mispella (jon43)      Join Date: Aug 2003       08-09-2007, 5:51 AM Reply   
sbt3- how long does it take to fill?
Old    Mispella (jon43)      Join Date: Aug 2003       08-09-2007, 12:16 PM Reply   
going with the 1 1/2" scoop strainer
Old    Stan Tanner (sbt3)      Join Date: Jun 2002       08-09-2007, 12:36 PM Reply   
Take me probably 10-15 minutes to fill 3 bags around 650lbs each the fill time is better if I am driving rather than just sitting there. So probably 10 driving and 15 sitting.
Old    d_fresh            08-10-2007, 4:28 AM Reply   
I have always used the "mushroom" type thru hull fitting instead of the scoop type fittings. The pumps are self priming, and you don't want water being forced into a scoop style intake if you empty while you are driving.
Old    Nacho (denverd1)      Join Date: May 2004       08-10-2007, 7:15 AM Reply   
you'll be happy with the big scoop. or mushroom. the improved flow rate will be nite and day.

Or you could put a fancy drain line on it! lol
Old    Tallredrider (talltigeguy)      Join Date: Sep 2003       08-10-2007, 9:05 PM Reply   
My Rival system came with a gigantic 1.5 inch internal diameter through hull. It is a monster. It definitely is overkill when you start to consider the hydrodynamics of things. I think there is something called Bernoulli's principle that I memorized for a test and have since forgotten.



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