D5 vario pump, noise question

[zella]

hey guys.

i set up my first loop before xmas. its bled, working just fine. temps are amazing.
however my D5 is quite noisy. I have seen people talk about it being silent, even on setting 5. can someone who has a D5, and has it on 5, clarify what they mean by silent. do they mean literally silent? (i would define silent as, you cant hear the pump, sitting at your desk, with all other fans off. of course i know if you put your ear next to the pump your gonna hear it)
right now, i have all my fans at a very quiet 600 RPM, and the pump is the loudest thing.
second thing to note is that when I have the pump on 1, its arguably silent, but the flow rate is not sufficient to cool my pc with the fans at such low speed, and my main goal is a quiet pc.

third: the volume levels increase in such a bizarre way, peaking at 3. So 5 is in fact quieter than 3? WTF

thanks

 

[FTR.4500MHz]

How is your pump mounted to your case ?

Can you also describe the noise ?!

 

[zella]

thanks for you speedy reply

yeah sorry, i knew i was forgetting to mention something.

i know i should have an isolator, but i didnt know about them at the time i set up my loop. when i can be bothered to re do it i will. in the mean time i have ordered some studio damping tiles, im gonna cut them up and box in the pump.

currently it is attached to case via velcro stick strips. which provides some damping, theres not metal on metal at least.

so the noise, as i say on 1 silent, no louder than my fans.

on 3 its a low pitch whurring. and on 5 its higher pitch than 3, but its quieter.

 

[andrewmchugh]

I have it on 1/5 I can hear it if I try. If you have it on foam it will be more silent. Mine is touching the case.

 

[zella]

hey, thanks for your reply.

i dont understand what you mean by 1/5?
you mean you have it on 1. and when you put it on 5 you can barley hear it?

if so why dont you have it on 5 the whole time

 

[blair]

I have the one speed slightly more powerful version and i wouldn't say it was silent, but its not loud, I can hear my keyboard and mouse clicks way above the pc and its less than a foot from me.

 

[zella]

ok so i should say at this point that i ran the pump "moist" for about 10 second when i first filled the loop. that is to say that it was mostly dry, the way my loop is set up the pump needed to be primed from the top, which meant taking the tubing from my rad of and filling the pump directly. at the time i didnt realise that, and tried to flood the pump from the input. that didnt work, and whilst figuring out this the pump ran with a small amount of water in for about 10 seconds.

now i know there are so many scare mongers out there who say that in a second flat you will fukk your pump if you run it dry. now that may well be the case, but i have obtained the operating manual from laings website, and here is what they have to say:

"If the system is not filled with water yet, reduce the time of a function
test to an absolute minimum. Extended dry operation of the pump will
damage the bearing."

this was translated from the original german (they are a german company). but even so, this hardly says that the pump will break if its run dry.

 

[B NEGATIVE]

ok so i should say at this point that i ran the pump "moist" for about 10 second when i first filled the loop. that is to say that it was mostly dry, the way my loop is set up the pump needed to be primed from the top, which meant taking the tubing from my rad of and filling the pump directly. at the time i didnt realise that, and tried to flood the pump from the input. that didnt work, and whilst figuring out this the pump ran with a small amount of water in for about 10 seconds.

now i know there are so many scare mongers out there who say that in a second flat you will fukk your pump if you run it dry. now that may well be the case, but i have obtained the operating manual from laings website, and here is what they have to say:

"If the system is not filled with water yet, reduce the time of a function
test to an absolute minimum. Extended dry operation of the pump will
damage the bearing."

this was translated from the original german (they are a german company). but even so, this hardly says that the pump will break if its run dry.

Let me tell you different,running a D5 or a DDC for even a few seconds without water can mark or wear the bearing enough to take life out of the bearing. This is well known. It wont fail immediately but it will fail a lot sooner than a pump that has never had a dry bearing.

 

[zella]

thanks for your reply.

yeah, i can believe that. but do you think its the cause of the noise

 

[son of spanner]

ive used a d5 in my last rig build i dont think runing it as you said for 10 sec,s
will do any harm as thay are well built unlike some pumps id say one of two things one you have air in the loop and as we all know wen the air gets in the pump thats wen the pump makes a lot of noise or two its the way its mounted in your case i used foam tape from my rc helis to mount my pump worked very well for me