Questions tagged [compressed-air]
The compressed-air tag has no usage guidance.
51
questions
0
votes
0answers
15 views
Calculating flow rate of compressed air to push another liquid out of a tank at a desired flow rate
I am working on a system for a university project which uses pressurised air to eject the contents of a tank through a pipe into the atmosphere. I am working on figuring out the flow rate and pressure ...
0
votes
0answers
71 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 ...
0
votes
0answers
29 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 ...
0
votes
2answers
44 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 ...
0
votes
0answers
27 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. ...
0
votes
0answers
16 views
Reality check: Sub-sonic convergent nozzle for raising gas velocity to achieve required velocity head
The situation is as follows: atmospheric air is accelerated to 5 m/s with an idealized disk actuator, then passed into a convergent nozzle such that it's velocity is raised to 339 m/s and then flows ...
1
vote
2answers
26 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 ...
0
votes
0answers
41 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
0answers
27 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 ...
0
votes
1answer
24 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
0answers
32 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 = ...
2
votes
0answers
24 views
How to balance flow and pressure in nitrogen purged chambers?
I have an instrument that is technically a humidity controlled chamber. It measures how much moisture is picked up by the sample through a microbalance(Zone 1). Nitrogen gas flows from zone 3 and ...
1
vote
2answers
847 views
What's the difference between a vacuum regulator and pressure regulator?
When browsing through pneumatic parts, I notice that some vendors specify different components for pressure regulator and vacuum regulators. SMC for example does this.
I'm curious why vendors would ...
1
vote
1answer
811 views
How do you interpret a pneumatic regulator symbol?
I'm an EE trying to interpret a pneumatic schematic and have a few questions regarding the symbols being used.
I've come across two different regulator symbols (or so I believe them to be regulator ...
1
vote
3answers
181 views
How do you read a blower/compressor curve with multi-curves for inlet guide vanes?
I am trying to apply an existing blower curve in a hydraulic model for a single stage blower with variable inlet diffuser vanes. The variety of curves shown on the plot does not seem to make sense to ...
1
vote
2answers
10k views
Define Free Air Delivery for an air compressor
Free Air Delivery (FAD) is a common measure of the capacity of an air compressor. I have a question that comes at the end here. My question is a little different from what you might be expecting. So ...
2
votes
2answers
292 views
How to calculate added lift from ground effect
I'm trying to build a hovercraft of sorts, and I thought I'd take advantage of the ground effect. I've done some searches, but I can't seem to find any guides on the actual physics. How do I go about ...
3
votes
0answers
67 views
Simplifying head loss across a piping network
I am tasked with designing a compressed air piping network,with and would like to determine the pressure loss across the different layers of instruments
-now here is the 3D layout of the network. ...
2
votes
1answer
68 views
Recommended compressed air source and location for separate air compression system
I am investigating what would be the most appropriate compressed air source (fan/blower/compressor) for designing a separate air compressor system.
The information is as follows:
the compressed air ...
0
votes
2answers
42 views
How deep would a water bottle have to be submerged in the sea to burst? [closed]
Assume the water bottle is the most sturdily built standard water bottle one could acquire in an american supermarket.
This is the first question I've asked, so I'm sorry if I'm not in the right ...
3
votes
3answers
134 views
What is the best method to generate heat from a compressed air canister?
I want to convert the pressured air exiting a valve to heat. I know that a vortex tube can be used to do this, but I am wondering if I need to make modifications to the vortex tube to make it more ...
1
vote
1answer
58 views
How to power and transport air to a small hover car track [closed]
I'm trying to design a hover car track. As in, you have a 'track/circuit' that have objects being slowly moved along by the force of the air from beneath and sides. The propulsion to move the objects ...
0
votes
1answer
39 views
What is this “johnson controls” device on the wall in airport?
I was passing column in waiting area of Pearson airport when my sweater cought some kind of device on the wall. Device was without cover and looks like old thermostat. When my sweater caught it, it ...
3
votes
2answers
81 views
Compressed air energy storage?
I'm wondering, if you put an air compressor pipe into a micro turbine, lets say something like that attached to a motor, does air that get out of the turbine have the same energy as when it gets in ?
...
1
vote
1answer
69 views
can we run rotary compressor of Air conditioner with different frequency level?
I am working on split type AC compressor. I actually want to know, if i changed the frequency of the compressor to run on different power level, will it affect the life of the compressor. My actual ...
0
votes
1answer
45 views
Drying a air-tight container
What method should i use in order to remove moisture from air of a container completely? Should i flush it with N2 or argon (its air-tight) or is there a device that i could use to remove moisture ...
0
votes
1answer
28 views
Compression and check valves
Pressure pumps are used to apply pressure to a system. What would happen if someone attempted to fill, for example, a bicycle tire (with a check valve) to 2 ATM of pressure using a pressure pump that ...
0
votes
2answers
114 views
What is a good non-combustible oil to be used in air compression regenerative braking/energy storage system for cars, buses, and trucks?
An important energy storage method that is being given very little consideration is gas compression. The kinetic energy of the vehicle can drive an air pump or compressor that would compress air into ...
1
vote
4answers
192 views
Tubing for explosive gas or hydrogen transfer
Recently, I heard that there is a law/ OSHA/ ASME piece of regulation dictating that hydrogen should be transferred (suppose from a tank of hydrogen to another location) by using specially approved ...
0
votes
1answer
750 views
compare l/min output of CO2 pressure reducer to bar (compressed air)
I have a pressure reducer calibrated for Argon and CO$_2$ output. If I connected it to a gas tank with compressed air, how can I convert the output information "liters of Argon / CO$_2$ per minute" to ...
2
votes
1answer
248 views
volume comparison of compressed air and gas duster
I'm currently using 400ml Dust Off 67 gas dusters and want to replace them with compressed air and a blow-out gun.
In order to select the right equipment and get a better understanding I would like ...
1
vote
4answers
178 views
What type of air blower/compressor to use?
I need a way to move air which is somewhere in between a compressor and a fan: something along the lines of 20-40 cfm at 2-3 psi (500-1000 liters/minute at 10-20 kPa).
Typical small compressors (of ...
3
votes
2answers
158 views
Check valve in compressed air pipe network?
I am working on a building that would like to used compressed air for some pneumatic actuators. They would like to bring the air in from an adjacent building that has more than enough capacity, but ...
12
votes
1answer
2k views
Why was Freon used in spray cans before it was declared a threat to ozone?
I've heard that in the past, spray cans (aerosol cans) contained Freon. I found that the Montreal Protocol made the usage of Freon illegal due to its effect on the ozone layer, but I can't find the ...
1
vote
1answer
60 views
pneumatic solenoid operation?
Any idea on how this type of pneumatic solenoid works? I know that NC is normally closed, NO normally open, but not sure how air flows? Thanks!
1
vote
1answer
40 views
Are “Imperial Eastman” compression connections sized the same as regular imperial connections?
I have some high pressure and vacuum lines off of a tool from the 1980s and they are labeled as, for example, "3/8 imperial - eastman," which seems to be different from how normal compression ...
0
votes
2answers
28k views
How does loading and unloading work in an air compressor?
I am looking at an ammonia refrigeration unit and trying to understand how loading and unloading solenoid valves work? and also how to modulate the compressor motor over a period of time.
3
votes
1answer
91 views
How do you actually control the cooling level of AC?
I'm hoping this is a relatively simple question to answer, but I just couldn't find it on Google.
With regard to air conditioning (or any cooling system that relies on compressing/evaporating), how ...
4
votes
0answers
531 views
Estimating Maximum Speed for a Pneumatic Cylinder
I am designing an machine that is going to use a pneumatic cylinder to accelerate a projectile. I have a tentative cylinder specified, and am working on the control and supply side. I have verified ...
0
votes
2answers
2k views
Compressed air as thrust? [closed]
I was watching a video recently about aircraft carriers and how they use compressed air to propel aircraft off the ship. It go me thinking if I had, maybe a 50x50x50 cm spacecraft that was put ...
1
vote
1answer
3k views
Basic difference between “compress” and “pressurise”
We call air which is pressurised as "compressed air". But we don't call pressurised liquid as compressed. I know that liquids are incompressible.
So,
why particular word "compressed" is the created, ...
0
votes
2answers
152 views
Using compression screw as air engine
Can a screw such as the one below be used as an air engine in pressure range between 700 kPa and 2500 kPa
on other words Can I reverse compression process with a screw to work as air engine
2
votes
1answer
205 views
Air tool to compressor backflow
As I was reorganizing my air tool arsenal, a theoretical question popped in my mind I'd like to know the answer to. In designing air flow between an air compressor and a tool (such as a nailer or an ...
4
votes
2answers
366 views
Turning an engine over with engine compression
When you compress a bicycle pump and seal the opening, the pump will automatically return to it's initial position when you release it. I suppose this is how air suspension works as well?
if you have ...
3
votes
2answers
334 views
Pneumatic Actuators - System Reversibility. Is it possible to use an actuator to store energy?
I'm very much new to pneumatics and I was wondering if there was such a thing as a reversible pneumatic actuator?
I'm designing a system that has to be lightweight, pneumatic and use a mechanical ...
8
votes
2answers
1k views
Air compressor that doubles as a pneumatic motor?
I am working on a compressed air energy storage system. The size and weight of the system are heavily constrained; nothing should (ideally) exceed a few pounds. For this reason, I would like to store ...
7
votes
2answers
2k views
Why does public transport uses compressed air to open doors instead of electromotors?
System with compressed air seems more expensive and harder to build and integrate neither using simple electromagnetic drives to open public transport doors.
5
votes
1answer
358 views
Are there any precedent designs for a mechanically-delayed pressure release valve?
I need to release pressure of around 50psi, after 3-4 seconds of initiating, from a vessel using a mechanical switch. I had considered a pneumatic solenoid, but I want to forgo the inconvenience of ...
3
votes
2answers
295 views
How to design a hemispheric flexible pressure vessel?
Consider a balloon, it is a flexible, expanding pressure vessel made of synthetic rubber. I am trying to design a system that will use hemispheric pockets of neoprene to grip an object, much like the ...
3
votes
1answer
1k views
Tankless air compressor for electronics desoldering station
I purchased a Weller WSD161V soldering station (similar to this one, at least with regards to the pneumatic system I'm about to describe -- sorry, I was unable to find a manual for my specific model ...
