Hi guys,

I bought one of those small compressors recently. Specs are
9CFM/50Litre/116psi. Uses a single phase motor that runs off a standard
13A wall socket. Very useful to have compressed air for all sorts of
purposes and certainly makes life easier when inflating tractor tyres and
such like.
The only problem is it's *very* noisy. 97dB it says on the side and I can
well believe it. Worst thing is it cuts off at 116psi and goes totally
silent until the pressure drops to 110 whereupon it immediately restarts.
Given that this interval can be quite long, especially when it's not
actually providing any air, that sudden burst into life again is enough
to make anyone **** themselves.
Given that it's only about the size of wheelbarrow (bit narrower in fact)
I'd like to knock up an acoustic cover for it to deaden the racket it
makes. Any suggestions as to suitable sound-deadening materials would be
most welcome!

ta.

On 12-Aug-17 1:30 AM, Chris wrote:

Hi guys,

I bought one of those small compressors recently. Specs are
9CFM/50Litre/116psi. Uses a single phase motor that runs off a standard
13A wall socket. Very useful to have compressed air for all sorts of
purposes and certainly makes life easier when inflating tractor tyres and
such like.
The only problem is it's *very* noisy. 97dB it says on the side and I can
well believe it. Worst thing is it cuts off at 116psi and goes totally
silent until the pressure drops to 110 whereupon it immediately restarts.
Given that this interval can be quite long, especially when it's not
actually providing any air, that sudden burst into life again is enough
to make anyone **** themselves.

That is why I sold my reciprocating compressor and bought a Hydrovane.
However, they are mostly three phase and not cheap.

Given that it's only about the size of wheelbarrow (bit narrower in fact)
I'd like to knock up an acoustic cover for it to deaden the racket it
makes. Any suggestions as to suitable sound-deadening materials would be
most welcome!

You need lots of mass. If practical, build it a brick or concrete
enclosure, preferably well away from anything else, and run fixed air
lines to the places you need the air.



--
--

Colin Bignell

In message , Chris writes
I'd like to knock up an acoustic cover for it to deaden the racket it
makes. Any suggestions as to suitable sound-deadening materials would
be most welcome!

The stuff made to quieten boat engines works well. I bought big offcuts
from a boat jumble many years ago and have used them for loads of
things.
It's a layer of something heavy (plastic, impregnated fibreglass sheet
or lead sheet) on a layer of foam. Expensive new, fairly cheap for
offcuts.

Basically, make a lined plywood box with a baffle around the air
intake/outlet. If the machine needs cooling make it in the form of a
chimney. A PC in a ventilated box I made to silence for studio use ran
cooler than in free air. It was very heavy, though.

There are cheaper versions. Look for marine soundproofing.
--
Bill

On 12/08/17 01:30, Chris wrote:

Hi guys,

I bought one of those small compressors recently. Specs are
9CFM/50Litre/116psi. Uses a single phase motor that runs off a standard
13A wall socket. Very useful to have compressed air for all sorts of
purposes and certainly makes life easier when inflating tractor tyres and
such like.
The only problem is it's *very* noisy. 97dB it says on the side and I can
well believe it. Worst thing is it cuts off at 116psi and goes totally
silent until the pressure drops to 110 whereupon it immediately restarts.
Given that this interval can be quite long, especially when it's not
actually providing any air, that sudden burst into life again is enough
to make anyone **** themselves.
Given that it's only about the size of wheelbarrow (bit narrower in fact)
I'd like to knock up an acoustic cover for it to deaden the racket it
makes. Any suggestions as to suitable sound-deadening materials would be
most welcome!

ta.

Decoupling it from the ground may also help limit the sound transmission.

Nick

Does it need cooling and of course it obviously needs an air intake. What
sort of sound is it, a high pitched whine or just a mechanical type sound.
I remember Braille printers were huge and make one heck of a noise.
Basically put it on a rubber mat on the floor and put an acoustic hood over
it was what we did with those.

The hood looked like it was very well braced plastic coated with panels to
stop resonances with some foam around the bottom and parts of the top.

Brian

--
----- -
This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please!
"Chris" wrote in message
news

Hi guys,

I bought one of those small compressors recently. Specs are
9CFM/50Litre/116psi. Uses a single phase motor that runs off a standard
13A wall socket. Very useful to have compressed air for all sorts of
purposes and certainly makes life easier when inflating tractor tyres and
such like.
The only problem is it's *very* noisy. 97dB it says on the side and I can
well believe it. Worst thing is it cuts off at 116psi and goes totally
silent until the pressure drops to 110 whereupon it immediately restarts.
Given that this interval can be quite long, especially when it's not
actually providing any air, that sudden burst into life again is enough
to make anyone **** themselves.
Given that it's only about the size of wheelbarrow (bit narrower in fact)
I'd like to knock up an acoustic cover for it to deaden the racket it
makes. Any suggestions as to suitable sound-deadening materials would be
most welcome!

ta.

In one place which used to be near residential properties they actually
buried it in a waterproof hole and put a big slab of concrete on the top!
Yes they obviously had some cooling on it. Never saw it up close.
I rather winder why we seem unable to make quiet equipment. Even lawn
mowers vary from barely audible to soundling like a wrecking machine.
Brian

--
----- -
This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please!
"Nick Odell" wrote in message
news
On 12/08/17 01:30, Chris wrote:

Hi guys,

I bought one of those small compressors recently. Specs are
9CFM/50Litre/116psi. Uses a single phase motor that runs off a standard
13A wall socket. Very useful to have compressed air for all sorts of
purposes and certainly makes life easier when inflating tractor tyres and
such like.
The only problem is it's *very* noisy. 97dB it says on the side and I can
well believe it. Worst thing is it cuts off at 116psi and goes totally
silent until the pressure drops to 110 whereupon it immediately restarts.
Given that this interval can be quite long, especially when it's not
actually providing any air, that sudden burst into life again is enough
to make anyone **** themselves.
Given that it's only about the size of wheelbarrow (bit narrower in fact)
I'd like to knock up an acoustic cover for it to deaden the racket it
makes. Any suggestions as to suitable sound-deadening materials would be
most welcome!

ta.

Decoupling it from the ground may also help limit the sound transmission.

Nick

On 12-Aug-17 11:55 AM, Brian Gaff wrote:
In one place which used to be near residential properties they actually
buried it in a waterproof hole and put a big slab of concrete on the top!
Yes they obviously had some cooling on it. Never saw it up close.
I rather winder why we seem unable to make quiet equipment. Even lawn
mowers vary from barely audible to soundling like a wrecking machine.

We can make quiet equipment, but usually not for the same price. You can
buy a small but noisy reciprocating air compressor for under £100. An
equivalent Hydrovane compressor, with a 62db noise rating, costs the
best part of two grand.


--
--

Colin Bignell

On Sat, 12 Aug 2017 16:58:29 +0100, Nightjar
wrote:

On 12-Aug-17 11:55 AM, Brian Gaff wrote:
In one place which used to be near residential properties they actually
buried it in a waterproof hole and put a big slab of concrete on the top!
Yes they obviously had some cooling on it. Never saw it up close.
I rather winder why we seem unable to make quiet equipment. Even lawn
mowers vary from barely audible to soundling like a wrecking machine.

We can make quiet equipment, but usually not for the same price. You can
buy a small but noisy reciprocating air compressor for under £100. An
equivalent Hydrovane compressor, with a 62db noise rating, costs the
best part of two grand.

I'd have to wear ear defenders to be near that! ;-)

I've got one of these:

http://www.axminster.co.uk/bambi-bb2...pressor-340648

(40db) and (depending on your needs etc) saved all the time, effort,
cost and inflexibility of arranging some sort of noise management to
go around a conventional jobby.

You can stand by it when it's running and whilst you can hear it is
on, you can still easily talk over it.

I also have a twin cylinder 50l compressor that I've not bothered to
run since I got the Bambi.

The Bambi is one of those (few) things that I would go straight out
and replace if I ever had to. ;-)

Cheers, T i m

On 12-Aug-17 6:22 PM, T i m wrote:
On Sat, 12 Aug 2017 16:58:29 +0100, Nightjar
wrote:

On 12-Aug-17 11:55 AM, Brian Gaff wrote:
In one place which used to be near residential properties they actually
buried it in a waterproof hole and put a big slab of concrete on the top!
Yes they obviously had some cooling on it. Never saw it up close.
I rather winder why we seem unable to make quiet equipment. Even lawn
mowers vary from barely audible to soundling like a wrecking machine.

We can make quiet equipment, but usually not for the same price. You can
buy a small but noisy reciprocating air compressor for under £100. An
equivalent Hydrovane compressor, with a 62db noise rating, costs the
best part of two grand.

I'd have to wear ear defenders to be near that! ;-)

60db is conversation in a quiet room. I used a couple of Hydrovanes in
my factories and they were not in the least intrusive.

I've got one of these:

http://www.axminster.co.uk/bambi-bb2...pressor-340648

(40db) and (depending on your needs etc) saved all the time, effort,
cost and inflexibility of arranging some sort of noise management to
go around a conventional jobby.

That isn't comparing like for like though. 1 cfm at 8 bar at a 50% duty
cycle, as compared to 4.2 cfm at 10 bar and continuous rated.

http://www.accltd.com/products.asp?recnumber=2257

You can stand by it when it's running and whilst you can hear it is
on, you can still easily talk over it.

I also have a twin cylinder 50l compressor that I've not bothered to
run since I got the Bambi.

The Bambi is one of those (few) things that I would go straight out
and replace if I ever had to. ;-)


--
--

Colin Bignell

On Sat, 12 Aug 2017 19:50:25 +0100, Nightjar
wrote:

On 12-Aug-17 6:22 PM, T i m wrote:
On Sat, 12 Aug 2017 16:58:29 +0100, Nightjar
wrote:

On 12-Aug-17 11:55 AM, Brian Gaff wrote:
In one place which used to be near residential properties they actually
buried it in a waterproof hole and put a big slab of concrete on the top!
Yes they obviously had some cooling on it. Never saw it up close.
I rather winder why we seem unable to make quiet equipment. Even lawn
mowers vary from barely audible to soundling like a wrecking machine.

We can make quiet equipment, but usually not for the same price. You can
buy a small but noisy reciprocating air compressor for under £100. An
equivalent Hydrovane compressor, with a 62db noise rating, costs the
best part of two grand.

I'd have to wear ear defenders to be near that! ;-)

60db is conversation in a quiet room.

Still not 40db though eh? ;-)

I used a couple of Hydrovanes in
my factories and they were not in the least intrusive.

Hence the smiley on my first post. ;-)

I've got one of these:

http://www.axminster.co.uk/bambi-bb2...pressor-340648

(40db) and (depending on your needs etc) saved all the time, effort,
cost and inflexibility of arranging some sort of noise management to
go around a conventional jobby.

That isn't comparing like for like though. 1 cfm at 8 bar at a 50% duty
cycle, as compared to 4.2 cfm at 10 bar and continuous rated.

http://www.accltd.com/products.asp?recnumber=2257

Nice, as you say, 'at a price' ... and hence my '(depending on your
needs etc)' bit. For mine the capacity is adequate for most things for
most of the time (especially considering what I paid for mine (25
quid)). ;-)

Cheers, T i m

On Sat, 12 Aug 2017 18:22:02 +0100, T i m wrote:

(40db) and (depending on your needs etc) saved all the time, effort,
cost and inflexibility of arranging some sort of noise management to go
around a conventional jobby.

You can stand by it when it's running and whilst you can hear it is on,
you can still easily talk over it.

Maybe that's *too* quiet. The person you're speaking with will hear you
break wind if that happens with only 40dB of background noise.



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protocols constitutes acceptance of this condition.

On 12/08/2017 01:30, Chris wrote:

Hi guys,

I bought one of those small compressors recently. Specs are
9CFM/50Litre/116psi. Uses a single phase motor that runs off a standard
13A wall socket. Very useful to have compressed air for all sorts of
purposes and certainly makes life easier when inflating tractor tyres and
such like.
The only problem is it's *very* noisy. 97dB it says on the side and I can
well believe it. Worst thing is it cuts off at 116psi and goes totally
silent until the pressure drops to 110 whereupon it immediately restarts.
Given that this interval can be quite long, especially when it's not
actually providing any air, that sudden burst into life again is enough
to make anyone **** themselves.
Given that it's only about the size of wheelbarrow (bit narrower in fact)
I'd like to knock up an acoustic cover for it to deaden the racket it
makes. Any suggestions as to suitable sound-deadening materials would be
most welcome!

ta.

I've used some stuff that's basically a sheet of lead on rubber with
adhesive on one side. Intended for automotive use. Effective.

Bill

On 12-Aug-17 8:46 PM, T i m wrote:
On Sat, 12 Aug 2017 19:50:25 +0100, Nightjar
wrote:
....
That isn't comparing like for like though. 1 cfm at 8 bar at a 50% duty
cycle, as compared to 4.2 cfm at 10 bar and continuous rated.

http://www.accltd.com/products.asp?recnumber=2257

Nice, as you say, 'at a price' ... and hence my '(depending on your
needs etc)' bit. For mine the capacity is adequate for most things for
most of the time (especially considering what I paid for mine (25
quid)). ;-)

The OP was speaking of inflating tractor tyres. I know which I would
prefer to have for that job. :-)


--
--

Colin Bignell