Centrifugal pumps, flow restriction and noise
Posted: Thu Mar 20, 2003 10:31 am
I have an Eheim 1046 centrifugal pump.
I had gone to the trouble of running 1/2"ID tubing and fittings everywhere because a posting on one forum had mentioned that restricted pumps were "noiser".
Using a vicegrips to slowly squeeze the tubing (using the screw in the handle) I found that there was essentially no change in noise - right up to the point where I had just about shut off all flow.
So, at least for this particular pump, restriction == pump noise is NOT true.
Just thought I'd save someone else the trouble as the larger hoses make things a bit more unweildy to deal with.
Bob
PS: I've an Athalon 2100+ (rated 1.73 Ghz) running at 2.1Ghz (200x10.5) that stays under 41C with a 1046 pump and ~950RPM 120mm fan (inaudible) exhausting case air through a 120mm "Black Ice" radiator. So, 20% boost, very quiet, not cold, but reasonably cool.
PS2: note that this is restriction on the pressure side. centrifugal pumps don't have much suction and restriction here might make noise - my system has a resevoir mounted right over the inlet so I'm unable to test suction restriction for noise.
I had gone to the trouble of running 1/2"ID tubing and fittings everywhere because a posting on one forum had mentioned that restricted pumps were "noiser".
Using a vicegrips to slowly squeeze the tubing (using the screw in the handle) I found that there was essentially no change in noise - right up to the point where I had just about shut off all flow.
So, at least for this particular pump, restriction == pump noise is NOT true.
Just thought I'd save someone else the trouble as the larger hoses make things a bit more unweildy to deal with.
Bob
PS: I've an Athalon 2100+ (rated 1.73 Ghz) running at 2.1Ghz (200x10.5) that stays under 41C with a 1046 pump and ~950RPM 120mm fan (inaudible) exhausting case air through a 120mm "Black Ice" radiator. So, 20% boost, very quiet, not cold, but reasonably cool.
PS2: note that this is restriction on the pressure side. centrifugal pumps don't have much suction and restriction here might make noise - my system has a resevoir mounted right over the inlet so I'm unable to test suction restriction for noise.