Shopping on line can be easy, simple and save you lots of money. It can also take a lot of your time, frustrate you, and result in unwanted purchases. Now the same can be said for regular high street shopping, but with the vast opportunity presented by the Internet it will pay you to spend a few minutes reading this and understanding how to better optimize your Gas Cylinder shopping experience:
1. Compare - without doubt the biggest advantage that the Gas Cylinder offers shoppers today is the ability to compare thousands of Gas Cylinder at a time. This is a great thing, but not necessarily all the time! Too much can be daunting at times so take advantage of the great comparison sites and where possible let them do the hard work for you.
2. Research - if it has been said it will be on the internet. Ignorance is no longer a justifiable reason for buying the wrong thing. Take the time to research in detail everything that you could possible want to know about
3. Testimonials - don't know anybody that has bought a Gas Cylinder? Wrong! If the Gas Cylinder is good the internet will let you know. Use the Internet as a friend and get testimonials before you buy.
4. Questions - Got a question about Gas Cylinder then search the Forums, FAQ's, Blogs etc. Don't be afraid to ask .....
5. Reputation - Never heard of the company selling Gas Cylinder? Don't worry, no reason why you should know every company in the world, but you know someone that does! Use the internet to find out what people are saying about Gas Cylinder and build up a picture of their reputation for sales, returns, customer service, delivery etc.
6. Returns - still worried that even after all of the above your Gas Cylinder wont be what you want? Check out the returns policy. There is so much competition now that someone, somewhere is bound to offer the terms that you are comfortable with.
7. Feedback - happy with your Gas Cylinder then let people know, after all you are depending on others people input in your buying decision, so why not give a little back.
8. Security - check for the yellow padlock on the Gas Cylinder site before you buy, and the s after http:/ /i.e. https:// = a secure site
9. Contact - got a question about Gas Cylinder, or want to leave a comment then check out the sites contact page. Reputable companies have them and respond.
10. Payment - ready to pay for your Gas Cylinder, then use your credit card or PayPal! Be aware of companies that don't accept them, there may be genuine reasons but given the huge amount of choice you have when buying online there is no reason at all not to buy via credit card or PayPal.
of steel.
For mechanical devices used to impart a force from a pressurized liquid or gas, see pneumatic cylinder.
A
Gas cylinder or tank (disambiguation) is a pressure vessel used to store gases at high pressure.
Applications
Applications for gas cylinders include:
Regulations and Testing
The transportation of high pressure cylinders is regulated by many governments throughout the world. Various levels of testing are generally required by the governing authority for the country in which it is to be transported. In the United States this authority is the
United States Department of Transportation (DOT), for Canada this authority is
Transport Canada (TC). Cylinders may have additional requirements placed on design and or performance from independent testing agencies such as Underwriter's Laboratory (UL). Each manufacturer of high pressure cylinders is required to have independent quality agent that will inspect the product for quality and safety.
There are a variety of tests that may be performed on various cylinders. Some of the most common types of tests are
hydrostatic test, burst test,
tensile strength,
Charpy impact test and pressure cycling.
During the manufacturing process, vital information is usually stamped or permanently marked on the cylinder. This information usually includes the type of cylinder, the working or service pressure, the serial number, date of manufacture, the manufacture's registered code and sometimes the test pressure. Other information may also be stamped depending on the regulation requirements.
High pressure cylinders that are used multiple times--as most are--are hydrostatically or ultrasonically tested and visually examined every few years. In the U.S., hydrostatic/ultrasonic testing is required either every five years or every ten years, depending on cylinder and its service.
Valve Connections
When gases are supplied in gas cylinders, the cylinders have a stop angle valve at the end on top. Often, gas cylinders are somewhat long and narrow and may stand upright on a flattened bottom at one end with the valve at the top. During storage, transportation, and handling when the gas is not in use, a cap may be screwed over the protruding valve to protect it from damage or breaking off in case the cylinder were to fall over. Instead of a cap, some cylinders have some sort of protective frame around the stop valve.
When the gas in the cylinder is ready to be used, the cap is taken off and a pressure-regulating assembly is attached to the stop valve. This attachment typically has a pressure-reducing valve with upstream (inlet) and downstream (outlet)
pressure gauges and a further downstream needle valve and outlet connection. The upstream pressure gauge indicates how much gas is left in the cylinder according to pressure. The regulator could be adjusted to control the flow of gas out of the cylinder according to pressure shown by the downstream gauge. The outlet connection is attached to whatever needs the gas supply, such as a
balloon for example.
The valves on industrial, medical and diving cylinders are usually of different size and type, as are the valves for different products, making it more difficult to mistakenly misuse a gas.
In the US, valve connections are sometimes referred to as 'CGA connections,' since the Compressed Gas Association (CGA) publishes guidelines on what connections to use for what products (e.g., In the USA, an argon cylinder will have a CGA 580 connection on the valve).
- Note: if the nut on a CGA connection has a notch in it, it uses a Screw thread.
High purity gases will sometimes use CGA-DISS ('Diameter Index Safety System') connections.
In the EU, Deutsches Institut für Normung connections are more common than in the US.
Color Coding
Gas cylinders are often
Bottled gas#Colour coding, but the codes are not standard across different jurisdictions, and sometimes are not regulated. Cylinder color should
not be used for positive product identification. Gas cylinders have labels affixed to them which identify the product they contain and the label alone should be used for positive identification. When the identification provided by the label is dubious, it should be marked Contents Unknown and returned to the manufacturer.
Safety
Because the contents are under pressure and are sometimes hazardous, there are special safety regulations for handling bottled gases. These include chaining bottles to prevent falling and breaking, proper ventilation to prevent injury or death in case of leaks and signage to indicate the potential hazards. Installing and replacing gas cylinders should be done by trained personnel.
In a fire, the pressure in a gas cylinder rises in direct proportion to its temperature (see the
ideal gas law). If the internal pressure exceeds the mechanical limitations of the cylinder and there are no means to safely vent the pressurized gas to the atmosphere, the vessel will fail mechanically. If the vessel contents are ignitable, this event may result in a "fireball". If the cylinder's contents are liquid but become a gas at ambient conditions, this is commonly referred to as a Boiling Liquid Expanding Vapour Explosion (
BLEVE).
Medical gas cylinders in the UK and other countries have a seal of Wood's metal between the valve block and the cylinder body. This seal melts at a comparatively low temperature (70°C) and allows the contents of the cylinder to escape in a controlled fashion, lessening the risk of explosion.
More common pressure relief devices are of a simple burst disc type. In these, a small burst disc is installed in the back of the valve. A burst disc is a small metal gasket engineered to rupture at a pre-determined pressure. Some of these burst disc are backed with a low-melting-point metal, so that the valve must be exposed to excessive heat before the burst disc can rupture.
If the valve of a compressed air cylinder is broken or sheared off, the released pressure will cause the cylinder to act like a rocket, shooting away quickly.
The
Compressed Gas Association sells a number of booklets and pamphlets on safe handling and use of bottled gases. (Members of the CGA can get the pamphlets for free.)
See also
External links
- Compressed Gas Association
of steel.
For mechanical devices used to impart a force from a pressurized liquid or gas, see pneumatic cylinder.
A
Gas cylinder or
tank (disambiguation) is a pressure vessel used to store gases at high
pressure.
Applications
Applications for gas cylinders include:
- pneumatic reservoirs in transport and industry
- storage of medical gases
- storage of breathing gases in diving cylinder
- storage of gaseous fuels for internal combustion engines, heating equipment and cooking such as LP gas, butane and propane
- storage of gases used for oxy-fuel welding and cutting.
Regulations and Testing
The transportation of high pressure cylinders is regulated by many governments throughout the world. Various levels of testing are generally required by the governing authority for the country in which it is to be transported. In the United States this authority is the
United States Department of Transportation (DOT), for Canada this authority is
Transport Canada (TC). Cylinders may have additional requirements placed on design and or performance from independent testing agencies such as Underwriter's Laboratory (UL). Each manufacturer of high pressure cylinders is required to have independent quality agent that will inspect the product for quality and safety.
There are a variety of tests that may be performed on various cylinders. Some of the most common types of tests are
hydrostatic test, burst test,
tensile strength,
Charpy impact test and pressure cycling.
During the manufacturing process, vital information is usually stamped or permanently marked on the cylinder. This information usually includes the type of cylinder, the working or service pressure, the serial number, date of manufacture, the manufacture's registered code and sometimes the test pressure. Other information may also be stamped depending on the regulation requirements.
High pressure cylinders that are used multiple times--as most are--are hydrostatically or ultrasonically tested and visually examined every few years. In the U.S., hydrostatic/ultrasonic testing is required either every five years or every ten years, depending on cylinder and its service.
Valve Connections
When gases are supplied in gas cylinders, the cylinders have a stop angle
valve at the end on top. Often, gas cylinders are somewhat long and narrow and may stand upright on a flattened bottom at one end with the valve at the top. During storage, transportation, and handling when the gas is not in use, a cap may be screwed over the protruding valve to protect it from damage or breaking off in case the cylinder were to fall over. Instead of a cap, some cylinders have some sort of protective frame around the stop valve.
When the gas in the cylinder is ready to be used, the cap is taken off and a pressure-regulating assembly is attached to the stop valve. This attachment typically has a pressure-reducing valve with upstream (inlet) and downstream (outlet) pressure gauges and a further downstream
needle valve and outlet connection. The upstream pressure gauge indicates how much gas is left in the cylinder according to pressure. The regulator could be adjusted to control the flow of gas out of the cylinder according to pressure shown by the downstream gauge. The outlet connection is attached to whatever needs the gas supply, such as a balloon for example.
The valves on industrial, medical and diving cylinders are usually of different size and type, as are the valves for different products, making it more difficult to mistakenly misuse a gas.
In the US, valve connections are sometimes referred to as 'CGA connections,' since the Compressed Gas Association (CGA) publishes guidelines on what connections to use for what products (e.g., In the USA, an argon cylinder will have a CGA 580 connection on the valve).
- Note: if the nut on a CGA connection has a notch in it, it uses a Screw thread.
High purity gases will sometimes use CGA-DISS ('Diameter Index Safety System') connections.
In the EU,
Deutsches Institut für Normung connections are more common than in the US.
Color Coding
Gas cylinders are often
Bottled gas#Colour coding, but the codes are not standard across different jurisdictions, and sometimes are not regulated. Cylinder color should
not be used for positive product identification. Gas cylinders have labels affixed to them which identify the product they contain and the label alone should be used for positive identification. When the identification provided by the label is dubious, it should be marked Contents Unknown and returned to the manufacturer.
Safety
Because the contents are under pressure and are sometimes hazardous, there are special safety regulations for handling bottled gases. These include chaining bottles to prevent falling and breaking, proper ventilation to prevent injury or death in case of leaks and signage to indicate the potential hazards. Installing and replacing gas cylinders should be done by trained personnel.
In a fire, the pressure in a gas cylinder rises in direct proportion to its temperature (see the ideal gas law). If the internal pressure exceeds the mechanical limitations of the cylinder and there are no means to safely vent the pressurized gas to the atmosphere, the vessel will fail mechanically. If the vessel contents are ignitable, this event may result in a "fireball". If the cylinder's contents are liquid but become a gas at ambient conditions, this is commonly referred to as a Boiling Liquid Expanding Vapour Explosion (BLEVE).
Medical gas cylinders in the UK and other countries have a seal of Wood's metal between the valve block and the cylinder body. This seal melts at a comparatively low temperature (70°C) and allows the contents of the cylinder to escape in a controlled fashion, lessening the risk of explosion.
More common pressure relief devices are of a simple burst disc type. In these, a small burst disc is installed in the back of the valve. A burst disc is a small metal gasket engineered to rupture at a pre-determined pressure. Some of these burst disc are backed with a low-melting-point metal, so that the valve must be exposed to excessive heat before the burst disc can rupture.
If the valve of a compressed air cylinder is broken or sheared off, the released pressure will cause the cylinder to act like a rocket, shooting away quickly.
The Compressed Gas Association sells a number of booklets and pamphlets on safe handling and use of bottled gases. (Members of the CGA can get the pamphlets for free.)
See also
External links
- Compressed Gas Association
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Gas Cylinders
Flogas ... Gas Cylinders. All prices for gas cylinders include delivery and VAT, for UK mainland purchase only.
Gas cylinder - Wikipedia, the free encyclopedia
A gas cylinder or tank is a pressure vessel used to store gases at high pressure.
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News Wales > Community > Woman burnt in gas cylinder accident :: News Wales is a daily updated Welsh news resource covering the Principality. Search or browse the extensive archive
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