Questions tagged [compressed-air]

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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.
54 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 ...
50 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 ...
32 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 ...
28 views

How do ultra high pressure air compressors work?

I am curious about multistage air compressors used in applications such as scuba tank filling or cryogenic fluid generation. Are there any special considerations applied to the pistons used in the ...
12 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 ...
24 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 ...
43 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=...
51 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?
67 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 ...
37 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 ...
48 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 ...
782 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 ...
39 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 ...
30 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 ...
73 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 ...
51 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 ...
27 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, ...
22 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 ...
55 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 ...
138 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 ...
30 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 ...
54 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 ...
30 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. ...
41 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 ...
52 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 ...
30 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 ...
30 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 (...
91 views