Beerhippie
Well-known member
A couple of weeks ago, I built a You Tube intake air muffler for our ridiculously loud vintage DeVilBliss 5 hp recip compressor.
It did nothing to reduce the noise, as per my OSHA-approved sound pressure meter. Between 85 and 90 dB at my desk, regardless.
So today I tried another approach. Folks replied to my thread about the muffler build with some suggestions to:
1) Relocate the intake outside.
B) Use a long section of hose between the comp and the intake filter.
iii) Build an insulated enclosure for the comp. Now, this just ain't happening due to where the comp is used to living.
So, a long hose leading to an outside intake. That I can do.
I have most of the parts I need around the shop: Some 1" plumbing fittings, a bunch of 1 1/4" tubing (hose) and a 1" wall flange from the muffler build.
Problem is, I need the wall flange to be a pass-through so I can mount the intake filter to the wall outside. This means re-tapping it all the way through:


Big tap require big wrench.
Now the flange is too thick for a close ******, so grind the boss off (yes, tapping it would have been much easier after grinding it down--but that would be thinkin' ahead):

Gawds, I love those 3M Cubitron II disks!

That's the ticket!
Shoot a heavy coat of black gloss on, and get it into the curing oven.
While that's happening (and after the weekly office meeting), I bored a 1 1/2" hole through the wall with a hole saw.

I mounted the intake well away from and lower than the Rinnai water heater exhausts so I don't pick up a bunch of CO. I also moved the outer coupler to the inside of the wall as the filter housing was sticking out too far in a forklift zone and the hose barb on the inside wasn't sticking out far enough.
Now, I'd ordered two 1 1/4 barb X 1" MNPT fittings to attach the hose to my fittings. Of course, what I got from The Jungle were two 1 " barb X 1" MNPT. Fortunately, it's a low-suction applications so this will work:

Finished:

It seems a little quieter to me, but best get out the meter and check. Nope. Still 85-89 dB at my desk. Maybe a dB or so of reduction, but I guess it's just a damned noisy old compressor.
You can see why an insulated enclose ain't practical there. I guess I'll live with it. At least the comp isn't sucking out what warm air I can muster in the shop anymore.
It did nothing to reduce the noise, as per my OSHA-approved sound pressure meter. Between 85 and 90 dB at my desk, regardless.
So today I tried another approach. Folks replied to my thread about the muffler build with some suggestions to:
1) Relocate the intake outside.
B) Use a long section of hose between the comp and the intake filter.
iii) Build an insulated enclosure for the comp. Now, this just ain't happening due to where the comp is used to living.
So, a long hose leading to an outside intake. That I can do.
I have most of the parts I need around the shop: Some 1" plumbing fittings, a bunch of 1 1/4" tubing (hose) and a 1" wall flange from the muffler build.
Problem is, I need the wall flange to be a pass-through so I can mount the intake filter to the wall outside. This means re-tapping it all the way through:


Big tap require big wrench.
Now the flange is too thick for a close ******, so grind the boss off (yes, tapping it would have been much easier after grinding it down--but that would be thinkin' ahead):

Gawds, I love those 3M Cubitron II disks!

That's the ticket!
Shoot a heavy coat of black gloss on, and get it into the curing oven.
While that's happening (and after the weekly office meeting), I bored a 1 1/2" hole through the wall with a hole saw.

I mounted the intake well away from and lower than the Rinnai water heater exhausts so I don't pick up a bunch of CO. I also moved the outer coupler to the inside of the wall as the filter housing was sticking out too far in a forklift zone and the hose barb on the inside wasn't sticking out far enough.
Now, I'd ordered two 1 1/4 barb X 1" MNPT fittings to attach the hose to my fittings. Of course, what I got from The Jungle were two 1 " barb X 1" MNPT. Fortunately, it's a low-suction applications so this will work:

Finished:

It seems a little quieter to me, but best get out the meter and check. Nope. Still 85-89 dB at my desk. Maybe a dB or so of reduction, but I guess it's just a damned noisy old compressor.
You can see why an insulated enclose ain't practical there. I guess I'll live with it. At least the comp isn't sucking out what warm air I can muster in the shop anymore.
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