Oceanrunner needlewheel vs Sedra needlewheel

[FinsReef]

The Eheim has so flap on the output, the Aquabee models do. There is no flaps on the RD pumps either. Pump RPM also has some to do with the amount of air intake.

 

[ejamsrhere]

Do the RD pumps pump in both directions or have they engineered the pump to only start up in one direction?

 

[FinsReef]

IIRC they are engineered to operate in only one direction like the Tunze line.

 

[Beenalongtime79]

IIRC... what's that stand for Brian?

Peace,
John H.

 

[FinsReef]

If I Remember Correctly.

 

[ejamsrhere]

That would make sense. I believe it is to make the flow out of the pump more efficient... less drag on the fluid leaving the pump. If you have a pump that spins in only one direction it has to be easier to design the output of the pump. You can design it to leave from one direction tangential from the impeller rather than having the V shaped outlet for either direction. Spend money on making it right and the best way, or just find a fix for the problem. It seems to be the universal law of engineering - you spend 95% of the total resources to finish the last 5%...

 

[shelburn61]

I am trying to use an oceanrunner NW pump on my top fathom skimmer. I put the venturi from the skimmer on the intake of the OR but it doesn't work.

Do some venturis only work when the water is pushed rather than pulled?

 

[Beenalongtime79]

shelburn...

Yes, that venturi is WAAAYYY too constricting on the input of that pump.

Brian at finsreef seems to be pretty cool w/ selling their venturis for the H&S... you should try them out.

Peace,
John H.

 

[Beenalongtime79]

shelburn,

For more details on why this is so... read the first page of this thread. I lay it out in detail as to why some venturis just can't be used on the inlet of a pump.

Peace,
John H.

 

[shelburn61]

Thanks Rufio,

What does the inside of the H&S air inlets look like? Are they tapered inside like a typical venturi or is it basically just a coupling with an air hole?

It seems too simple an item to justify the cost so I might go the pinched PVC route or use Bobnburton's design instead.

 

[Beenalongtime79]

You'll have to question Brian at Finsreef about that one, although I would imagine that the venturi is tapered, just not as restrictive as venturis that go on the outlet of a pump.

I think the pinched PVC route will do you just fine.

Peace,
John H.

 

[ejamsrhere]

shelburn61

I'm using a sedra on my TF 400... you're going to love it when you get it set up... I get so much more stinky gunk out. It's great.

 

[shelburn61]

oceanrunner 2700 on a top fathom 110

oceanrunner 2700 on a top fathom 110

I thought I could remove the stock venturi and use the OR 2700 and pinched T venturi, but the skimmer overflows. I guess the problem is that the outlet pipe is only 3/4 and the OR pumps around 700gph? The skimmer body is 4.5" W and ~20" high. Is this too small for the pump?

I could rip out the 3/4" outlet and replace with 1" or should I just give up on the OR?

Any ideas for a NW pump that might work better on this skimmer?
My system only has a total volume of 60g, but I still think the 235gph GenX is not big enough.

 

[Beenalongtime79]

I would first try to up the size of your outlet, and if you still can't get it to work, then I'd go w/ the sedra 3500.

http://www.fishsupply.com/cgi-bin/f...=f2&mode=item&path=top/S/SW/SWBZZ/SPKSP-S3500

Peace,
John H.

 

[ViciousFishes]

Rickster or anyone else who might be interested. I found this place that carries the OR and Sedra about $10 bucks cheaper then what you were looking at.

http://www.customaquatic.com/customaquatic/subsubcategorypage.asp?subcatindexid=ps-ac-pm

 

[Adam]

Hi all,

For those that want to use European pumps with metric ports:

I spent about two minutes searching and found this place that carries metric PVC fittings (remember the prices are $ Can!):

http://www.dwyermfg.com

They are in Canada, but would probably ship to the US. A little more searching should reveal some place in the US that carries these fittings or another Candian company that might be more retail oriented.

Beats the heck out of dremeling, gooping with glue or other strategies for force fitting US sized fittings onto European pumps.

Adam

 

[brentp]

Here is the response from the company that makes the fittings:

Dear Brent,

The distributor which we could name in the USA is the company :

Dramm Corporation
2000 north 18th Street
P.O. Box 1960
Manitowoc, WI 54221
USA

Tel no. 920 684 0228
Fax .no. 920 684 0193


Best Regards,

Leo A. Lampert
Commercial Manager

Van de Lande B.V.
Lissenveld 1
4941 VK Raamsdonksveer
The Netherlands

 

[ejamsrhere]

sweet deal.

 

[bond007069]

So what pipe fittings you one use for a Gen-x 4100 NW RC skimmer design?

 

[Rip Current]

I have an old cs 6-3 euro-reef with a sedra 3500.
the pump is a lil weak for the skimmer.
so I cut off the venturi and stuck a piece of tubing in the intake.
the tubing was a size bigger the the ER tubing .
WOW what a differance! about 30-40% more air and water!