panworld pump :(

[Kenfuzed]

I previously ran a Panworld on a CL and cured the noise with a combination of things. The first was to use a 12" piece of vinyl tubing just prior to the intake, and another piece between the output and the plumbing back to the tank. Second, I increased the size of the intake plumbing to 1-1/4 spa-flex. Third, I removed the fan and installed a heatsink and fan from a computer.

Now I know you say "it's not a noisy fan", but it's not necessarily the fan itself that makes the noise but rather a balance issue. The fan is said to actually cause the motor to vibrate. When removed the motor IME ran smoother and with the heatsink and PC fan ran cooler. There's a great thread on this in the DIY forum.

 

[newnano]

aquatic man---on these returns that you have, do you have the return split to more than just one outlet?

 

[newnano]

ken--the balance issue does make sense!!! that could explain why adding pressure to the intake or output gets rid of the vibration.

 

[newnano]

i was so excited. last night i went home and took off the fan cover and fan and NOTHING. same thing. back to square one.

matt-- i do have a ball valve on the returns but i have close one of them so much to get rid of the noise that it defeats the whole purpose

 

[monkeyreefer]

<a href=showthread.php?s=&postid=7378819#post7378819 target=_blank>Originally posted</a> by newnano

i have 1.5in coming out of the tank (60gal cube) half way down. this 90's down toward the pump with spa flex to a what i call a disconnect but its a union. then its hard 1 in pvc to the intake of the pump.

the pipe to the intake side of the pump should never be reduced, id change over to all one inch and se if it is still an issue

 

[newnano]

its only reduced to the actual diameter of the pump intake and that is 3 feet above the intake

 

[BreadmanMike]

<a href=showthread.php?s=&postid=7383502#post7383502 target=_blank>Originally posted</a> by newnano
aquatic man---on these returns that you have, do you have the return split to more than just one outlet?

Yes, on one setup I have it split into 2 - 3/4" returns and on another I have it split into 2 - 1" returns. All my plumbing is spa flex and pvc fittings after the pump and they are hard plumbed into my sumps.

 

[newnano]

i dont get it. i give up. im going to see if this other pump panworld is sending me will work.

ha! just noticed we are neighbors aquaticman. i grew up in Lansing

 

[BreadmanMike]

No kidding! You're the second person I've spoke to on here that escaped this area! The other guy moved to Az. I live right over by Pano's off Burnham Ave. Been here for 27 years.

Out of curiosity, have you tried putting some 3/4" pvc or tried to reduce in any way the 2 - 1" bulkheads. Maybe that added pressure will quiet it down?

 

[newnano]

im still in the area though just over the border.

yes, i have a 1in to 3/4 reducer screwed in the bulkhead in the tank and 3/4 lockline in that.

i think the lack of pressure is causing the pump to over-rev and vibrate.

 

[BreadmanMike]

That should be plenty of pressure with the two outlets reduced...
Keep us posted on how this third pump works out.

 

[RichConley]

<a href=showthread.php?s=&postid=7391785#post7391785 target=_blank>Originally posted</a> by newnano
im still in the area though just over the border.

yes, i have a 1in to 3/4 reducer screwed in the bulkhead in the tank and 3/4 lockline in that.

i think the lack of pressure is causing the pump to over-rev and vibrate.

Its cavitating. When you put pressure on the output it stops cavitating because the impellar slows down.

3/4 intake is NOT big enough for this pump, especially if you're pulling through 3 feet of tube.

 

[RichConley]

<a href=showthread.php?s=&postid=7389850#post7389850 target=_blank>Originally posted</a> by newnano
its only reduced to the actual diameter of the pump intake and that is 3 feet above the intake

Most pumps need larger piping than their intakes. Usually about twice the side. The fact that its reduced 3 feet above the intake, and not right in front of it, makes it much worse. You're putting a lot of restriction on the intake of this pump, and that is why it is cavitating. When you put back pressure on the output, it doesnt need to suck in as much water, so it stops cavitating.

 

[newnano]

i tried that as well. i had a larger pipe going right up to the end.

that is incorrect though. i talked with two different engineers and they both said that the pumps are designed to run on what ever the inlet and outlet diameters are.

plus if i put stick my hand over the intake and restrict the water going to the pump the noise stops as i stated previously.

 

[BreadmanMike]

Out of curiosity.... Did you have Kurt drill your CL for you? I read that your tank was a GC tank in another thread, and he called me when he was drilling a 60 cube from them.