Joshua1023
New member
I guess its worth a shot. My fittings didn't look tapered either.
Recirc pump for 6" Skimmer
- Thread starter thorsky
- Start date
Joshua1023
New member
I didn't say that. I just said they don't look tapered. They threaded into standard piping just fine.
thorsky
New member
Mmm kay, problem solved:
I took the output off the pump to do this. Using a small butane torch I heated the 3/4" FPT portion of a 3/4" FPT to 1" MPT fitting. Once the threads were just barely pliable, I quickly screwed the OTP fitting into the PVC fitting. Basically, what I'm left with is a 1" MPT input and output on the OTP3000. I could probably get the new pieces apart, but I risk damaging it and there really is no reason.
So, it CAN be done.
I took the output off the pump to do this. Using a small butane torch I heated the 3/4" FPT portion of a 3/4" FPT to 1" MPT fitting. Once the threads were just barely pliable, I quickly screwed the OTP fitting into the PVC fitting. Basically, what I'm left with is a 1" MPT input and output on the OTP3000. I could probably get the new pieces apart, but I risk damaging it and there really is no reason.
So, it CAN be done.
Joshua1023
New member
Did that work for the intake as well? Nevermind, I forgot that your pump came w/ some hardware. I'm glad that it worked out for you.
thorsky
New member
The intake does come with a venturi, but I'm pretty sure I can't use it with the recirc config. EIther way, the intake threading seams to fit a 1" FPS fitting no problem. It fit the FPT fitting but I just didn't like the way it felt. Too tight after a half turn or so.
Updates to follow!
Updates to follow!
will you pm me where you got the tubing, and how much it was? please<a href=showthread.php?s=&postid=9641335#post9641335 target=_blank>Originally posted</a> by thorsky
Oh yeah, 3' of 8" OD x7.5" ID cast tubing should be here by Friday if all goes well. Fun things for the weekend.
thorsky
New member
Ok, time for some quick numbers. I was able to play with the OTP 3000 for a while tonight. All tests run in 14" clean salt water with no output restriction.
Stock OTP, stock venturi: 14 SCFH (6.6LPM)
Stock OTP, nasty DIY venturi: 15 SCFH (7LPM)
Ported, polished OTP, meshwheel, even nastier DIY venturi: 30 SCFH (14.2LPM)
That's as far as I got tonight. When I say nasty venturi above, I mean it. The thing is but ugly. I used a 1" FPT to 1" slip PVC connector drilled and tapped for a 1/4" ID hose barb (3/8" poly tubing). Then I took a piece of 1" PVC and heated it until it was soft. Squished one end with pliers and jammed the other end into the slip fitting. Voila.
For mesh I'm still using scrubby pads. Not at all optimal from what I am finding but it works for now. The first meshwheel self destructed in a matter of seconds, I had used zip ties and I don't thing they were tight enough. The second try was with fishing line and it held together fine for testing.
30 SCFH it pretty good. I think with more time and effort I can get a bit more out of the pump.
Stock OTP, stock venturi: 14 SCFH (6.6LPM)
Stock OTP, nasty DIY venturi: 15 SCFH (7LPM)
Ported, polished OTP, meshwheel, even nastier DIY venturi
: 30 SCFH (14.2LPM)That's as far as I got tonight. When I say nasty venturi above, I mean it. The thing is but ugly. I used a 1" FPT to 1" slip PVC connector drilled and tapped for a 1/4" ID hose barb (3/8" poly tubing). Then I took a piece of 1" PVC and heated it until it was soft. Squished one end with pliers and jammed the other end into the slip fitting. Voila.
For mesh I'm still using scrubby pads. Not at all optimal from what I am finding but it works for now. The first meshwheel self destructed in a matter of seconds, I had used zip ties and I don't thing they were tight enough. The second try was with fishing line and it held together fine for testing.
30 SCFH it pretty good. I think with more time and effort I can get a bit more out of the pump.
thorsky
New member
Never got around to those pics did I? To tell the truth, I've been down and out for the last 3 days. Seems the Rota...or Nora....or one of those nasty stomach bugs that have been going around decided to visit my house. The wife, the 6 month old and I all succumbed. The two 11 years olds?? Nothing. Little twirps!
Anyway, back in action today. I just made up a newer, cleaner and prettier venturi and did some tests. I was able to pull a steady 37 SCFH (17.4LPM).
This venturi is made from a piece of 1" pipe reamed just enough to let a piece of 3/4" pipe slide in. These two pieces are about 2.5" long and are slid into a 1" FPT to slip connector. I drilled through the connector and the two tubes and press fit a piece of 3/8" poly tube. I tried this setup with the poly tube inserted all the way in and cut at an angle and only saw 30 SCFH. With the tube cut square and inserted only to flush, I got 37 SCFH. Not sure if that explanation works, but I'll try to get some pics up later tonight.
Anyway, back in action today. I just made up a newer, cleaner and prettier venturi and did some tests. I was able to pull a steady 37 SCFH (17.4LPM).
This venturi is made from a piece of 1" pipe reamed just enough to let a piece of 3/4" pipe slide in. These two pieces are about 2.5" long and are slid into a 1" FPT to slip connector. I drilled through the connector and the two tubes and press fit a piece of 3/8" poly tube. I tried this setup with the poly tube inserted all the way in and cut at an angle and only saw 30 SCFH. With the tube cut square and inserted only to flush, I got 37 SCFH. Not sure if that explanation works, but I'll try to get some pics up later tonight.
RandyStacyE
New member
If I understand you correctly, you now have a pipe within a pipe and inserted the air line flush with the interior of your venturi?
If so then I'm thinking it looks something like this:
Sounds interested, can't wait to see some pics
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