quieting a mag 18?

[EnderG60]

Ok I have a client that is complaining about the hum of his mag 18.

I have the pad thing that comes with it on there, and all the piping is 1" untill it splits into two 3/4" hoses.

Alot of the vibration seems to be transmiting through the sump/stand. Would putting a piece of foam or neoprene(sp?) under the sump help?

Or is there anything else I can do.

 

[wwest]

i would take a wrist rest for a keyboard or mouse and make that work. maybe a mouse one would be better. its just of gel and would stop alot of vibration in turn would stop the hummy.

 

[EnderG60]

the pad it comes with is the same stuff as a mouse pad, so should i just add more, or should i put some under the sump?

 

[EnderG60]

up

 

[twon8]

you might try cleaning it in some vinegar; ime when they get a bit of calcium deposits they tend to be a bit louder.

 

[EnderG60]

its brand new..

 

[wwest]

sorry for the confusion enderg60 i was referring to wrist rests.

http://www.discountofficesupplies.c...ficialAndq=keyboard wrist restsAndbtnG=Search
there is a link they are really cheap at wally world and do wonders with a high vibration pump.

 

[EnderG60]

linky no work

 

[clamdigr]

I assume the pump is externally mounted? PVC between the pump and sump? If so, you may need to isolate it from the sump with flexible hose instead. Or as you said, soft rubber under the sump to isolate it from the stand. I'm sure the sound must be resonating through the stand like a guitar body. I run two MAG 18's submerged both are quiet.

Mike

 

[CoralFiend]

I noticed sometime back that Marine Depot has something on their site that recommends not using these pumps mounted externally. I have several of them and all are submerged. All are practically silent.

 

[EnderG60]

no its actually submerged...it really isnt that loud as far as pumps go(reason I had them go with a mag drive)...they are just being kinda anal, since they were using old canisters on the last tank.

If you put your hand on the floor in front of the stand you can feel the vibration, as well as with the stand. So im just trying to lessen that vibration.

 

[CoralFiend]

If it is making the floor vibrate, sounds like the stand has no bottom and the sump is sitting directly on the floor. How about a foam pad under the whole sump? I have a pad under mine. Same foam they use in above ground pool liner installations. I believe you can get it at Lowe's, but it is sold for another purpose. The stuff I have is blue and is about 1/2" thick. It will compress a little though.

 

[EnderG60]

yeah someone actually recommend that today as well, think ill give that a try. I was going to line the bottom of the stand with old mouse pads, but ill give the lowes padding a try as well.

and no there is a bottom to the stand. Its not anything major...your average fish person wouldnt consider it that loud at all, but you know how people are

 

[mm949]

too much pressure....use 1" all the way to the bulkhead

 

[EnderG60]

the bulkheads have 3/4" hose barbs on em.

layout is as follows. 3/4" outlet on the pump to a 1" converter, 1" check valve, 1" ball valve all the way open, about 3" of 1" hose into the 2" UV then to a 1" T that is reduced to two 3/4" barbs, 2 feet of 3/4" hose to the bulkheads.

now if I turn the ball valve down to 3/4 of total flow it get a tiny bit quiter but nothing major.

would replacing those two 3/4" hoses with 1" and then reducing them right at the end really make that big a differance since its 3/4" pvc after that anyway?

 

[8BALL_99]

Mag pumps just are loud to me.. You wont get rid of that hum.. If you can feel it in the floor then I'd for sure try to put some kind of padding under the sump.. That pump will always vibrate and make a hum though..

If it keep being a problem maybe go with two smaller quieter pumps insted of one large loud pump..

 

[mm949]

u would be surprised.....when the water hits the top of the 1" T it will create a pressure spot trying to squeeze into 3/4"....u get less head loss horizontal vs vertical....i would ditch the 3/4" barbed bulkheads for standard ones and reduce at the bulkhead... to get the most flow from your pump i would hard pipe w/ sch40 1" and start from the bulkheads connecting them with a T and then 1" ID hose to the pump...u can also cut the hose a little short so the pump is suspended and not sitting on the bottom....less vibration...
good luck

 

[ambaratur]

Pardon my ignorance here but isn't the recommendation on mag drives to double the size of the output pipe? i.e. 3/4" output means you should use 1 1/2" pipe until you split it?

 

[old salty]

<a href=showthread.php?s=&postid=7913535#post7913535 target=_blank>Originally posted</a> by ambaratur
Pardon my ignorance here but isn't the recommendation on mag drives to double the size of the output pipe? i.e. 3/4" output means you should use 1 1/2" pipe until you split it?

I did just this. Right now, I am running a Mag 12, but one day I will upgrade to the 18.

 

[EnderG60]

the holes for the bulkheads only allow for 3/4" so there is going to be a reduction at some point in the system before the bulkheads, and I would think the reduction from a single 1" to two 3/4" would have a minimal pressure increase.

We are going to try padding under the sump and see how that works and go from there.