Questions tagged [compressed-air]
The compressed-air tag has no usage guidance.
90
questions
0
votes
0
answers
19
views
I would like to know about the composition of a compressed air system
I am a graduate student and I am planning to conduct high-speed flow experiments using a high-pressure tank. The equipment we currently have is a compressor, air tank, and regulator, and the regulator ...
1
vote
1
answer
60
views
Why are double-acting reciproating compressors more efficient than single-acting ones?
On many websites, I read that double-acting reciprocating compressors are more efficient than single-acting compressors.
These sources say it's because they complete two compression cycles on each ...
- 48
0
votes
0
answers
35
views
How much air pressure is needed to push liquid out of a tank
I want to use compressed air to push diesel out of a 100 gallon rectangular tank for fueling equipment. Tank is 24” tall with a 30’ 3/4” hose reel on top. Height of the nozzle would be 6’ ft from the ...
0
votes
0
answers
82
views
Pros and Cons of Carbon Fibre High Pressure Tank
What are the advantages and disadvantages of using carbon fibre for pressure vessel construction?
Carbon fibre has a very high tensile strength and is very light-weight.
According to this calculator ...
- 1
0
votes
0
answers
25
views
Would there be a flame front in this case of combustion
Suppose a piston enclosing an amount of air-fuel mixture and then this piston compresses the mixture to the point of auto ignition, if every part of the mixture ignite simultaneously is it safe to say ...
0
votes
0
answers
27
views
Atlascopco screw compressor unload abnormal sound
We are facing an issue in our GA 75 FF model compressor. During the unload time the compressor is making some abnormal noise, but during the load it is working fine.
When the machine is unloaded after ...
0
votes
1
answer
36
views
Piston Compressed Pneumatic Cannon
During an discussion with friends regarding pneumatic cannons, I came up with this gem :). Piston power pneumatic cannon. My friends however, didn't share my excitement regarding this revolution in ...
0
votes
0
answers
5
views
Does drierite produce particles when drying and filtering compressed air?
I need to dry and filter some air for an air-driven rotary tool. I have an in-line drierite container but wonder if it will itself produce particles. Because of the fittings I have available it would ...
- 253
0
votes
0
answers
6
views
Opposing orientation of multi-stage particulate filter in Nitrogen separation/purification system
I recently purchased an assortment of parts taken out of a Nano Purifications Nitrogen Generator, one of the parts included was a two stage filter for removing particulates from the air stream. The ...
- 1
-1
votes
1
answer
39
views
Why is there a MIN and MAX marking on a car coolant bottle?
This question was initially posted in physics stack exchange, then the mechanics stack exchange but I think it's more appropriate for engineering section instead.
I've always thought the minimum and ...
- 19
1
vote
1
answer
52
views
How long it takes to fill an inflatable to a certain pressure?
I am trying to figure out the inflation/how to calculate the time it takes to fill something to a certain pressure.
I have an inflatable dock I am filling with a portable pump.
The dock is 7ft x 7ft x ...
- 13
0
votes
1
answer
62
views
Can Vortex tubes be used in cooling rooms?
Vortex tubes have been used extensively to some extent in cooling small areas. However, can they be used to cool larger rooms. Through some research, I found out that an average vortex tube may take ...
- 1
1
vote
3
answers
157
views
Can air compressors be used to boil water?
I was just reading an article about how air compressors can be used as an energy source. As the air is compressed, its temperature increase significantly, and this energy stored as heat can be used to ...
- 121
1
vote
0
answers
32
views
A 40L compressed air cylinder at 100 bar is emptied in pulses at the rate of 41kg/s. How many such cycles would it take to empty the cylinder? [closed]
I am constructing a blowback gas system where clogged debris needs to be removed with compressed air using compressed air cylinder. 40L compressed air cylinder at 100bar pressure is available as ...
- 11
0
votes
1
answer
25
views
Pneumatic pressure sensing in a moving air compressor line
I am building an automatic control system for an compressor that stops at a designated pressure. Here's a rough sketch of the system:
The compressor should receive the on signal from the ...
- 101
0
votes
2
answers
96
views
Question about oblique shock and expansion fans
Hi I am an engineering student.
I have a question about oblique shock and expansion fans. In my understanding, oblique shock and expansion fans could happen on supersonic airplane foil. But how often ...
- 3
0
votes
3
answers
75
views
Releasing compressed air with the loudest pop
Due to the dry summer I've been thinking about theory of making cracker/banger without fire. Would connecting a nozzle (de Laval?) to quick release valve from small cylinder with the pressurised air ...
18
votes
4
answers
5k
views
Why are train brakes so complicated?
The concept is simple enough: no pressure in the train line has the brakes locked, full pressure is loose, and partial pressure drags accordingly. So if pressure is lost for any reason, the train ...
- 591
2
votes
3
answers
96
views
Is there a good way to passively dry air in the input of a vacuum pump?
I'm using an a/c compressor as a vacuum pump for small projects that don't need a good vacuum pump, and I'm looking for a way to dry the air in the input, to prevent water from mixing with the oil ...
- 121
0
votes
0
answers
32
views
Air Filtering using a Air Tank
I just got a theory, However I don't know if it would work the way I wanted it to, though I still have hope and want to see if you agree with me.
As we all know, CO2 Slowly sinks as it is heavier than ...
- 111
2
votes
1
answer
477
views
Out of the three types of Stirling Engines, which one is the most efficient and delivers the most amount of power?
I was thinking that the beta Stirling engine would be the most efficient as it has a displacer to block heat transfer from the hot to cold regions in between thermodynamic cycles. However, I heard ...
- 105
1
vote
0
answers
55
views
What's the most efficient air compressor to reliably deliver up to 15 litres per second at 10 bar? [closed]
Suppose I wanted to continuously supply up to 15 litres of air per second, compressed to 10 bar - what would be the most efficient type of compressor, i.e. the type requiring the least energy input in ...
1
vote
1
answer
145
views
How to calculate rock permeability in m^2 from gas flux in m/s?
I am studying rock caverns lined with concrete for compressed air storage. I would like to know if it's possible to convert the permeability coefficient from m/s to m^2 or Darcy.
Thank you.
- 13
4
votes
3
answers
337
views
Specific heat at constant volume used in non constant volume processes
I have commonly seen that the work for an isentropic compression is written as:
$$
W_{in} = c_{v}(T_1 - T_2)
$$
What confuses me is that since it is a compression (volume is changing) why do we use ...
- 273
1
vote
1
answer
574
views
Is using your mouth and lungs to blow away dust inside your computer somehow bad for the computer?
Bottles of compressed air are very expensive where I live. While it would be nice and ideal to have and do a "proper" cleaning, I've always used my mouth and lungs to blow air onto the dust ...
- 11
0
votes
0
answers
69
views
Is there a miniture atmospheric water vapor condenser?
I am looking to add a condenser for a plant preserving container. The plants need water and I was wondering if I can have a passive method to condense atmospheric moisture to water. My container is ...
0
votes
0
answers
24
views
Can't Find Regulator for 16G CO2 Cartridge (800 PSI to 400-200PSI)
I am trying to make a Paintball Gun that works off of 16G CO2 Cartridges(800 PSI). I can't find a compact regulator that drops 800 PSI down to 400-200 PSI. If anyone knows of such a regulator could ...
1
vote
0
answers
31
views
Why does use with air or water reduce the maximum temperature of certain high temperature / pressure hoses?
This example is a Parker Hannifin model 426/436 "SAE 100 R1 AT / SAE 100 R16 High Temperature Hose".
Here are the temperature specifications:
(Full data sheet)
Although there is an asterisk ...
- 205
0
votes
1
answer
140
views
How to make a 500+ psi water gun staff
I would like to create a life size lego Bionicle Aqua axe(gali nuva Type or gali master of water Type). The problem is unlike The trident in this video:
https://m.youtube.com/watch?v=NK6MWt7vpVE&t=...
0
votes
2
answers
72
views
What is the maximum temprature that could be achieved by compressing air?
We know that compressing air produces heat but is it possible to achieve temprature of 700degree C just by compressing air. If not what will be the maximum temprature that could be achieved?
- 97
2
votes
1
answer
404
views
Why air compressing mechanism "Trompe" is not popular in usage?
I was amazed when I got to know that there is such a simple mechanism know as Trompe to compress air.
It has no moving parts which make it cheap to construct and do not require any servicing.
Even the ...
- 97
2
votes
1
answer
55
views
Slow Driving an Air Compressor
Do off-the-shelf air compressors have minimum driving speeds, below which they cannot build the necessary pressure? Reciprocating compressors and scroll compressors are available—is there a difference ...
- 170
0
votes
1
answer
305
views
Why do high pressure multistage air compressor have different piston diameter sizes? [closed]
I meant like this kind of compressor https://www.bauer-kompressoren.de/fileadmin/_processed_/csm_compressor-block-junior2_b92a76a02e.jpg
also would the compressor reach high pressure if the diameter ...
-1
votes
3
answers
3k
views
Is it safe to use a 125PSI rated auxiliary air tank with a 150PSI air compressor?
I have a small, 5 gallon, pancake compressor which has a maximum 150PSI rating. Unfortunately, it doesn't have the air capacity to power the demands of an HVLP paint sprayer or a die grinder without ...
- 160
-1
votes
1
answer
54
views
How to decrease Nitrogen gas consumption in Iron & Steel Plant? [closed]
I need to decrease nitrogen gas consumption in iron & steel plant.
Currently it's not possible to measure every dot from steel mill to determine real usage so they use what air separation unit ...
- 19
-1
votes
1
answer
280
views
Is it possible to connect a car air compressor to a blow out gun?
I have a compressor with this type of outlet:
I am not sure how it is called, but it works for my bicycle and car.
Then I have a blow out gun to clean electronics by a stream of compressed air. The ...
- 101
0
votes
2
answers
128
views
Regarding design of a compressed air delivery system based on a screw air compressor
I want to select a screw compressor for my application wherein I need a pressure of about 18 psig, and 300 cfm at the aforementioned pressure. The compressors I'm finding suitable for the system have ...
-1
votes
2
answers
162
views
How far can we compress air manually?
I am not sure if such devices even exist, but I'm sure we can improvise.
A device in which we could (manually) turn a shaft, screw a screw, or hammer an air-tight follower into a strong walled ...
- 98
1
vote
1
answer
37
views
Cumulative effect of two axial fans
If I already have a small DC axial 2m3/h fan blowing air at something, what will happen if I add a larger more powerful 6m3/h DC axial fan blowing from behind that one (i.e. its the larger fan first, ...
- 337
1
vote
1
answer
23
views
How do cavity resonators differ from tubes of uniform width?
I read that wine bottle produces sound when u blow sideways onto its rim because
some frequencies of the white noise produced in your mouth gets amplified when they match the natural frequency of the ...
1
vote
2
answers
93
views
How can I build a regulated pressurised air supply?
I need a source of air pressure for an air bearing (3D printed cylinder that expands air upwards like an air hockey table). I would like to be able to control the flow of air. I don't have a lab air ...
- 13
0
votes
0
answers
231
views
Using one electrical pump for multiple hoses
I'm currently trying to figure out a cheap way to build a cocktail machine.
For now the machine should have about 20-30 possible input liquids. These liquids should remain in their original bottle ...
- 109
0
votes
0
answers
36
views
Are we capable of building bigger high pressure cylinders?
Check out this 200-300 bar cylinders:
Is it practically possible to build a bigger cylinder of say: 10m x 1m - and make it hold a pressure of ...
- 157
0
votes
2
answers
94
views
What is the idea behind an expansion valve?
I am watching this video(https://www.youtube.com/watch?v=gVLhrLTF878) and beginning at around the 2:20 mark, it explains the significance of an expansion valve with the following ideas:
Restricts ...
- 103
0
votes
0
answers
34
views
Do companies recover CO2 and water from the purification step of cryogenic air separation, and how?
In the 3rd step of cryogenic air separation, filtered air is purified to remove water, CO2, and hydrocarbons from the N2-O2-Ar stream. Im interested in knowing what happens with that CO2 and water. ...
- 109
1
vote
2
answers
205
views
Compressing gas with liquid
This question, in short, is: Can a gas be compressed with high pressure liquid?
As a scenario, imagine a tank full of atmospheric gas at STP. Could something like a pressure washer pump (in this case ...
- 13
0
votes
0
answers
62
views
Force of Jet from Air Compressor
I want to use a compressor to create a jet of air. At discharge from compressor how much CFM (Cubic Feet per Minute) are enough to create a force that can turn a heavy object (say 40 kg) at 3 rev per ...
0
votes
0
answers
32
views
Is this is a valid estimation for the mass flow required for Hyperloop air-bearings?
In Hyperloop air bearings, the air escapes through the rear cross-sectional area of each ski, you know? Yes, there is a pressure differential, but the air comes out of the skis, crashes into the tube ...
user20096
0
votes
1
answer
43
views
Pressure delivered to an object under a pneumatic press
I'm hoping some kind person can tell me if I have this right or not. I swear this isn't a homework problem.
I'll be using a heated pneumatic press to heat seal lidding to plastic containers (...
1
vote
0
answers
121
views
What happens when throttling in an isothermal process
Consider an isothermal expansion of an ideal gas (always at ambient temperature $T_0$), from some initial pressure $p_i$ to the ambient pressure $p_0$, such that the maximum work available is:
$W = ...
- 11