So just how noisy are pumps supposed to be?

[Huntman40]

Hi All

Well im confused, I had a green saer pump that was very noisy when running, I have now fitted my new pump From Glenn (if he is on this forum).
Its one of the yellow 50LPM jobbies. Now the new pump is actually noisier but it can be quietened by removing the eductors.

It seems that these little pumps are quite noisy when you make them work at pressure. Now how can i keep the powerful agitation that the eductors provide without restricting the pump flow?

I assume a large low pressure eductor could be made but would it be effective?

With the amount of noise the processor pump makes im actually trying to think where else it could go or a soundproof cupboard in the shed.

[greasemonkey]

I've got one of those little green Saer pumps. It seems a few people have had problems with them, but so far, mine is fine.

Certainly you can hear it, but it does not make enough noise to have to raise your voice if you talking to someone.

What it does do, is when the oil runs low in the tank feeding it, is alter its pitch quite a bit, and it does increase in volume a little. I'm wondering, is it the pump making the noise, or is what it is attached to acting as an amplifier.

[Head Womble]

A pump like any other electric motor will change pitch when put under load.
An eductor relys on pressure to to give the nozzle velocity needed, so loads the pump quite hard.

I have a 110lpm pump and run a low pressure singal stage eductor off it, even though the nozzle is 15mm (the rest of my pipework is 28mm) for some reason it's quieter when running the eductor than the venturi, or even both at the same time.

It may just be me, but I think centrifugal pumps are quieter than peripheral ones (mines centrifugal).

[Huntman40]

Here is mine running (SAER one)
http://www.youtube.com/watch?v=jvFtcVdw49w

The sound is definitely amplified by the pipework and the barrel but its screaming.

[Tony]

It may just be me, but I think centrifugal pumps are quieter than peripheral ones (mines centrifugal).

Definitely agree with that.  This is why I put a venturi bypass on my first processor (peripheral pump) because you could hear it unload and quieten down without it working against the venturi.

But with my bigger centrifugal pump it's the same happy hum regardless of whether there is a venturi in the way or not.

[Tony]

Here is mine running (SAER one)
http://www.youtube.com/watch?v=jvFtcVdw49w

The sound is definitely amplified by the pipework and the barrel but its screaming.

They do squeal like that when the bearings or seal are failing, but that's more of a nasty on-off metal on metal squeal and it also happens when the pump is unloaded (IE not working against anything).  Yours sounds pretty normal for a well loaded peripheral pump.   Nice steady noise.

[jgs600]

sounds about right as they say under load they will make a slightly louder noise, if the bearings were on the way out you would know for sure. have sent pm

[Huntman40]

I have now tackled the noise issue. I have rubber hose on the inlet and outlet of the pump to dampen the vibration.
a nice foam mat for it to sit on and its much better.
I could easily pump wash into the night if i wanted. 

[Tony]

If this is a reactor pump then that is rather risky - the flexible part of the pipe could fail and empty the processor - if the heater is on while this happens then BOOOOOM.

[Huntman40]

So how could I resolve the vibration issue without the rubber pipe?

Am I going to have to go centrifugal if I want quiet operation?

I can't keep sitting next to the processor watching these rubber pipes, it's boring me to death!

[Head Womble]

Good insulation on pipes and reactor should reduce the volume quite well.

[jgs600]

ive always had 1" clear reinforced pipes on my processor. over 4 years now and never had a problem

[nathanrobo]

ive always had 1" clear reinforced pipes on my processor. over 4 years now and never had a problem

I've always had wire reinforced PVC on the pumps suction, which is what I use with gear pumps too.  But on the processor side of things, I've renewed the hose when over it goes cloudy.  Never had this stuff fail and it does give you a clue as to what's going on with the reaction.

Not sure about the new machine though.

[Huntman40]

How are you securely connecting 1" pipe to your pumps?

For testing i am using pipe over 22mm coper with hose clips. I dont dare connect the eductors up

[K.H]

Solder an olive on or use a solder ring, it gives the pipe something to bite on