# What is gas cylinder: Definition and 20 Discussions

A gas cylinder is a pressure vessel for storage and containment of gases at above atmospheric pressure. High-pressure gas cylinders are also called bottles. Inside the cylinder the stored contents may be in a state of compressed gas, vapor over liquid, supercritical fluid, or dissolved in a substrate material, depending on the physical characteristics of the contents. A typical gas cylinder design is elongated, standing upright on a flattened bottom end, with the valve and fitting at the top for connecting to the receiving apparatus.
The term cylinder in this context is not to be confused with tank, the latter being an open-top or vented container that stores liquids under gravity, though the term scuba tank is commonly used to refer to a cylinder used for breathing gas supply to an underwater breathing apparatus.

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1. ### Need Help figuring out this gas cylinder volume issue

First post but this issue has me mind boggled. I work for a compressed gas cylinder test lab and we are doing some gas cycle testing. I am testing 300 liter composite gas cylinder and filling it with nitrogen to 5000 psi, it takes 4 hrs to fill with 2 Bauer high pressure compressors running...
2. ### Predicting Remaining Pressure in Compressed Gas Cylinder

Well, it's been nearly 10 years since my last post, and it's been about that long since I've thought about ideal gases, so here we go :smile:. Description of Setup I have a system that uses compressed gas cylinders as a source to slowly purge an optical payload. The source is 12x compressed...
3. ### I Calculating Pressure Change Filling Gas Cylinders

I want to work out how to calculate the pressure change in a gas cylinder if it is used to fill another cylinder to a lower pressure. For example, if a 50 litre gas cylinder initially at 200 bara is used to fill a 600 litre cylinder from atmospheric pressure to 1.5 Bara. What would the change...
4. ### B Gas cylinder at constant pressure being exposed to atmosphere, how?

im learning thermodynamics and currently in a lesson about thermal processes. one process has constant pressure and before diving into equations or any proof the book provides a figure of a gas cylinder. the cylinder has a movable piston/lid on one side. the book then says "...and the piston end...
5. ### I Calculating Cooling Effect in Gas Cylinder Expansion

I'm building a gas supply system that will dump half the contents of a compressed gas cylinder of nitrogen in 10 minutes. I need to ensure the output delivery pressure doesn't fall below a certain limit because of cooling during the gas expansion. If the cooling effect is excessive, I will...
6. ### Number of balloons that can be filled from a gas cylinder

##\frac{P_{cylinder}.V_{cylinder}}{P_{balloon}.V_{balloon}}=\frac{n_{cylinder}.R.T}{n_{balloon}.R.T}## ##\frac{n_{cylinder}}{n_{balloon}}=\frac{4 \times 10^4 \times 2.5 \times 10^7}{7.24 \times 10^3 \times 1.85 \times 10^5} \approx 746## But the teacher said I should take the volume of gas...
7. ### How long will it take for a gas cylinder to empty?

The main aim of my question is to find time taken by gas filled tank while emptying (from full to zero) it into atmosphere? I require a set of equations which might be used in the calculation of such a situation. Known parameters are: 1. Pressure inside the gas tank. 2. Dimension and shape of...
8. ### How to Calculate Gas Cylinder Drain Time from Pressure to Atmospheric?

Do you know where I can find a formula to calculate how long it would take to drain a cylinder under pressure to atmospheric pressure? if I know the volume of the cylinder and the size of the opening.
9. ### Calculating the resonant frequency of a gas cylinder

I would like to make a bell out of a used compressed gas cylinder, but I would like to tune it to a specific note or frequency, e.g. A (440Hz). Can someone help with a formula to calculate this so I can cut it precisely?
10. ### Phases of hydrocarbons in a compressed gas cylinder

I'm currently in the process of selecting gas mixtures to calibrate a gas chromatograph. One of the gas mixtures I'm interested in has the following composition by percent volume: methane (CH4): 95% carbon dioxide (CO2): 1% butane (C4H10): 1% acetylene (C2H2): 1% nitrogen (N2): 2% The gas...
11. ### Determining How Long My Gas Cylinder Will Last

I'm not sure whether this is the correct place to post but here goes :wink: I'm trying to determine how long my argon gas cylinder will last when I am using it for tig welding. The cylinder is supplied with 1.32m³ (1320L) of Argon at 137 bar (13.7 MPa). If I set my regulator pressure to 0.5...
12. ### Calculation for knowing duration of gas cylinder

I know the total volume of a gas cylinder, the pressure in it, and the outlet pressure that needs to be maintained. The flow rate is also known. How should I calculate the total duration the cylinder will last? Also, what should vary if the cylinder is a liquidified gas cylinder?
13. ### What happens when a pressurized gas cylinder falls over?

This is health&safety related question that came out of a discussion I had with a friend. I sometimes keep a large (L sized) helium cylinder in my lab. It is pressurized to 200 Bar and equipped with a standard regulator. Now, the question is what would happen if it fell over and the...
14. ### How long to drain a gas cylinder?

How long to drain 228 CF of gas at 2640 psi thru a 3/32 nozzle at 15 psi?
15. ### Deriving motion of a displaced piston on a gas cylinder

First, I'm a second year high school physics student so my thinking may be half-baked. I was wondering what motion a piston would exhibit if it was the frictionless lid of an ideal gas cylinder with a constant amount of air, and if it was pushed or pulled a little bit. There would be a...
16. ### MHB Minimizing the cost of a gas cylinder

determine as dimensions of a gas cylinder of volume "V" for .an industry, whose coast is minimal, if the same Eastern pair formed a body par topped cylindrical half balls at the ends. It is known that the cost of construction par m2 of these hemispheres is 6 times greater than for the...
17. ### Calculating Gas Flow Rate and Pressure Drop When Throttling a Cylinder

How do I write an expression that describes how the pressure and temperature in an insulated tank changes with time after a valve is opened? This is an adiabatic, reversible process with fixed volume V, pressure P, and temperature T, I've been thinking and thinking but I don't know how to solve...
18. ### Went along my uncle to get the natural gas cylinder refilled

Today I went along my uncle to get the natural gas cylinder refilled. He uses it at his farm. When the refilling man placed it on the weighing scale it weighed, let's say, 7 kg. During the refilling process the cylinder was placed on the scale. Once he removed the refilling pipe after the...
19. ### Potential Energy of a compressed gas cylinder

Hello, This is not a homework problem, but an engineering office problem. I’m looking to replace a steel compression spring with a gas cylinder. The spring is presently designed to absorb a known amount of kinetic energy which it ideally converts to potential energy (neglecting friction...
20. ### Exploring an Expandable Gas Cylinder

Homework Statement An expandable cylinder has its top connected to a spring with force constant 2.00 103 N/m. (See Fig. P10.58.) The cylinder is filled with 6.00 L of gas with the spring relaxed at a pressure of 1.00 atm and a temperature of 20.0°C. I searched for a similar question...