Using Compressed Air Tools Outdoors: Can it be Done?

In summary: The amount of gas used would be 102.6 mol - 23.76 mol = 78.84 mol. Then, dividing by the rate of 9.508 mol/min, we get 8.3 minutes or 500 seconds of use. In summary, the mechanics can use the bolt wrench outdoors at -20 °C for approximately 8.3 minutes or 500 seconds before the tank of pressurized air runs out.
  • #1
stephenranger
36
1

Homework Statement


Car mechanics use compressed air tools to open bolts. Instead of using an air compressor one can also use a tank of pressurized air. There is an air tank with a volume of 50 L to work with. The pressure of the tank is 50 bars when it is stored indoors at 20 °C. The bolt wrench needs at least 10 bar pressure to operate.

Homework Equations


How long can the mechanics use the bolt wrench outdoors at -20 °C if it consumes 200 L/min of air at normal pressure ? the normal pressure is 1.0 bar.

The Attempt at a Solution


R = 8.314E-2 L bar/(mol K)
the tank holds this many moles
n = PV/RT = 50(50) / (8.314E-2 * 293) = 102.6 mol of air
at -20° the pressure will be
P = nRT/V = 102.6(8.31E-2)(253)/50 = 43.174 bar
How many moles can be delivered from 43.174 bar down to 10 bar, the lower limit?
all else being equal, moles are proportional to pressure
X mol / 102.6 mol = 10 bar / 43.174 bar
X mol = 23.76 mol (useful amount of gas)
How much does the wrench use per minute?
n = PV/RT = 1.0 (200) / (8.314E-2 * 253) = 9.508 mol per minute
finally
23.76 mol / 9.508 mol/min = 2.499 or 2.5 min to 2 sig figs or 150 s

Is the solution correct ?
 
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  • #2
Your X mol seems to be the amount of gas left in the tank when the wrench stops working, not the amount of gas used.
 

1. Can compressed air tools be used safely outdoors?

Yes, compressed air tools can be used safely outdoors as long as all safety precautions are followed. This includes wearing appropriate protective gear, using a moisture filter to prevent water from entering the tools, and ensuring that the air supply is clean and free of contaminants.

2. What is the best type of compressed air for outdoor use?

The best type of compressed air for outdoor use is dry, clean, and oil-free air. This is because outdoor environments can be more prone to moisture and dust, which can cause damage to the tools and affect their performance. It is important to use a moisture filter and an oil separator when using compressed air tools outdoors.

3. Are there any specific precautions that need to be taken when using compressed air tools outdoors?

Yes, there are a few precautions that should be taken when using compressed air tools outdoors. These include wearing protective gear, using a moisture filter and oil separator, and regularly inspecting and maintaining the tools to ensure they are in good working condition. It is also important to be aware of any potential hazards in the outdoor environment, such as loose debris or uneven surfaces, that could impact the safety and effectiveness of using compressed air tools.

4. Can compressed air tools be used in extreme weather conditions?

Compressed air tools can be used in extreme weather conditions, but it is important to take extra precautions. For example, in very cold weather, it is important to use a moisture filter and drain the air compressor regularly to prevent freezing. In hot weather, it is important to use an air dryer to prevent moisture from entering the tools and causing damage.

5. Are there any alternative power sources for using compressed air tools outdoors?

Yes, there are some alternative power sources for using compressed air tools outdoors. These include battery-powered compressed air tools, which can be convenient for remote outdoor locations where access to electricity may be limited. Another option is using a gas-powered air compressor, which can provide a reliable source of compressed air for outdoor use. However, it is important to use caution and follow safety precautions when using gas-powered tools.

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