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Had one like that (had to wear hearing protection just with the compressor running).Compressor head was wore out, and old enough there was no noise abatement at all.Needed to either overhaul the pump or replace it (wasn't pumping as much air as it was supposed to, by a lot).No time for the overhaul, found a brand new pump from Grainger (same pump, same manufacturer, before they moved to China ).New pump was tighter and came with an intake silencer.MUUUUCH quieter, not even annoying when it's running now.Point being, you may have the same issue, loose pump and no intake silencer. Click to expand.Yuppers, my bud has one sitting in his shop right next to where you are usually working and it drives me nuts. Worse yet he turns the radio in the shop up high enough to try and drown the compressor out.Pour a small pad on the side of the shop and build a small room for it that is well insulated but vented to the outside. Make it just big enough to roll a lawn mower in and when you go to sell the place you can call it 'the yard equipment room'.
Rig a drain valve and pipe on the bottom of the compressor that blows to the outside of the building when you drain the tank and you are done and can keep your sanity. I work part time in a machine shop that has a fairly new but large compressor. We moved the shop in late 2000 and located the compressor close to the electrical panel at the extreme far end corner of the shop. With the taller ceilings it was very loud.So we got some plywood sheets and built a doghouse for it. It measures around 7' long x 5' tall and 4' wide and was built to slide away easily for maintenance. Inside the doghouse, we glued in sheets of 1' house hard-foam insulation, doubled up.
There is a fan to exhaust the hot air mounted on the top.This has quieted it down a whole lot. Any other tools that generate noise like sanders, abrasive cutoff saws are located by it as well. On a smaller compressor, the theory should work just as well.Bob. I just made an air compressor box for my upright 30 Gallon Campbell Hausfeld. Here's what I did.(Ignore the board stacked on top of it.that's just extra wood sitting on top)I used 1/2' OSB board24' x 24' overall outer dimensions60' tall with a double roof inside (one roof inside the other with a letter 'S' shaped outlet for air at the top).Floor is 24'x24' OSB with 1' pink styrofoam on topWalls (and door, of course) and ceiling of box are 3 1/2' thick fiberglass insulation.
I used the 15' wide roll that is 32 feet long. IT works out perfectly where you only need one 32 foot roll.It is so quiet you can talk on your cell phone while leaning against the front door. Before this, it drove you out of your mind even if you were 30 feet away!! Ping me if you want the plans.I used screen (aluminum screen) to hold the fiberglass insulation in place.