Roots 15 hp VAC install?

[ccw]

I have the roots 15 hp vac system.
I understand that the thing is rather loud.
I want to move it about 50'from the bot and put it in a sound reduced box. Understanding that the ambient temp can not exceed 120 deg.
Im wonder what effect on performance this will have, any thoughts?

[Brady Watson]

Mark,
You will lose some CFM over the 50', especially if you have 90° bends. You might want to put it in a room(like a mechanical room), not a box, with vents top and bottom to let the air circulate.

-Brady

[ccw]

Brady,
Are you aware of a formula that will give me some guidelines?
I will wind up with #3 90 deg. turns in the run.
I have a stair well that im thinking of closeing in to accomadate the louder pieces of equipment.
Either way thanks for the info.
Mark

[Brady Watson]

Correction Factors for Friction Loss in 2" Vac Tubing:

-Sweep 90 ell equals 5 feet of tubing

-45 ell equals 2.5 feet of tubing

-Loss of CFM in 75 feet of tubing equals 2%

I thought that the loss would be more than this...The loss really stems from friction of the inner walls, but 3% loss is nothing. It's like 8 CFM or something with the 3 ells and 50' of 2" tube.

-Brady

[gerald_d]

Most of the noise emitted by compressors and vacuum pumps comes out of their ports. A silencer/muffler on the exhaust port of a vacuum pump kills a heck of a lot of noise.

[Brady Watson]

Even with the silencer attached these things are pretty noisy. The 15HP has it's own muffler...and it's about 4' long & 9 or 10" in diameter...If i remember correctly.

-B

[trevor_b]

The pump I have on my system is surprisingly quiet - its easy to have a normal conversation over it.
Its 10hp and sucks really well. Its very noisy on start up, but once the thing is warm ( 5 mins) it runs sweet. Lots of "warm" air though.....!

I know this doesnt help Mark, but there are other options out there which are quiet.

Trevor.

[gerald_d]

Trevor's pump:


11534.jpg
11535.jpg

11536.jpg
11537.jpg

Is that the exhaust port that we see on the last 2 pics?

Edited to say that the specs are here - yes, it is the exhaust port.

[gerald_d]

Trevor, I would be a bit concerned about sawdust blocking up the cooling air channels of your style of pump.

[Brady Watson]

Eww! I didn't know the new ones didn't have a muffler on them...I was thinking a 15HP Cascade...