Noise Insulation for shop compressor?

[Doofy]

Also, air compressor manufacturers have been caught stretching the truth. My Cambell Hausfeld 6 Horsepower / 60 Gallon compressor is actually only 3.4 Horsepower. Beware of Lies!

 

[dragoneggs]

Also, air compressor manufacturers have been caught stretching the truth. My Cambell Hausfeld 6 Horsepower / 60 Gallon compressor is actually only 3.4 Horsepower. Beware of Lies!

Yep... look at Volts x amps/745 for more accurate Hp number.

 

[Doofy]

Companies sure know how to troll for Suckers. Sears also nailed me on a 6hp Shop Vac about 20 years ago. It couldn't have been over a 1hp. Still using it with a "Dust Deputy" in the garage.

 

[radios1]

Companies sure know how to troll for Suckers. Sears also nailed me on a 6hp Shop Vac about 20 years ago. It couldn't have been over a 1hp. Still using it with a "Dust Deputy" in the garage.

it was probably 6HP. PEAK. NOT Average.. like when the motor is stopped very quickly after it gets to full speed!..

 

[BukitCase]

" look at Volts x amps/745 for more accurate Hp number"

Mark, a MINOR "nit pick" - 1 electrical horsepower is 745.7 watts :laughing:

Also, using that formula only tells you how much horsepower you're INPUTTING; one example - the 5 horse industrial compressor I linked to previously in this thread, uses 21.5 amps @ 240 volts: so it's INPUT power works out to just over 6.9 horsepower. Works out to just over 72% efficiency, IF that Baldor motor's only putting out a REAL 5 horsepower.

And no, I'm NOT gonna hook it up to a rope/pulley/weight and see if it can lift a 550 lb weight more than 5 feet per second :laughing:

Attention Required! | Cloudflare

radios1 - I've seen little 120 volt vertical "roll-around" compressors marked 6 horsepower; pretty sure they used locked rotor amps to calculate THAT lie ... Steve

 

[ovrszd]

Kinda like small fuel engines.

 

[BukitCase]

Yup; one of my old man's favorite sayings was "figures don't lie- but a liar can figure..." ... Steve

 

[radios1]

" look at Volts x amps/745 for more accurate Hp number"

Mark, a MINOR "nit pick" - 1 electrical horsepower is 745.7 watts :laughing:

Also, using that formula only tells you how much horsepower you're INPUTTING; one example - the 5 horse industrial compressor I linked to previously in this thread, uses 21.5 amps @ 240 volts: so it's INPUT power works out to just over 6.9 horsepower. Works out to just over 72% efficiency, IF that Baldor motor's only putting out a REAL 5 horsepower.

And no, I'm NOT gonna hook it up to a rope/pulley/weight and see if it can lift a 550 lb weight more than 5 feet per second :laughing:

Attention Required! | Cloudflare

radios1 - I've seen little 120 volt vertical "roll-around" compressors marked 6 horsepower; pretty sure they used locked rotor amps to calculate THAT lie ... Steve

if someone wants to calculate the kinetic energy of a motor running a 3450 rpm and has a 10 lb. rotor, here's the formula.. Kinetic energy is directly proportional to the mass of the object and to the square of its velocity: K.E. = 1/2 m v2. If the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared. Kinetic energy is usually measured in units of Joules (J); one Joule is equal to 1 kg m2 / s2.

 

[dragoneggs]

" look at Volts x amps/745 for more accurate Hp number"

Mark, a MINOR "nit pick" - 1 electrical horsepower is 745.7 watts :laughing:

Also, using that formula only tells you how much horsepower you're INPUTTING; one example - the 5 horse industrial compressor I linked to previously in this thread, uses 21.5 amps @ 240 volts: so it's INPUT power works out to just over 6.9 horsepower. Works out to just over 72% efficiency, IF that Baldor motor's only putting out a REAL 5 horsepower.

And no, I'm NOT gonna hook it up to a rope/pulley/weight and see if it can lift a 550 lb weight more than 5 feet per second :laughing:

Attention Required! | Cloudflare

radios1 - I've seen little 120 volt vertical "roll-around" compressors marked 6 horsepower; pretty sure they used locked rotor amps to calculate THAT lie ... Steve

if someone wants to calculate the kinetic energy of a motor running a 3450 rpm and has a 10 lb. rotor, here's the formula.. Kinetic energy is directly proportional to the mass of the object and to the square of its velocity: K.E. = 1/2 m v2. If the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared. Kinetic energy is usually measured in units of Joules (J); one Joule is equal to 1 kg m2 / s2.

Yep all good stuff guys... thanks for adding additional 'noise' here. :laughing:

 

[dstig1]

So I looked into mine a bit more. Here it is with a look at the air intake. There is a pleated paper element like an old style car engine air filter and a tube sticking up inside the housing for some reason. This doesn't look far off what the "mufflers" that you see from a web search show.







Then I used an app to measure the sound level via my phone. It averaged out around 68.5 dB at ~3'. But yet it seems louder than that to me. I'm not sure if this thing is at all calibrated, so maybe I will check it vs a sound meter we have at work. But if that is correct, then you guys with the 80+dB compressors must be in a world of hurt!