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Compressed natural gas (CNG) is a fuel gas mainly composed of methane (CH 4), compressed to less than 1% of the volume it occupies at standard atmospheric pressure.It is stored and distributed in hard containers at a pressure of 20–25 megapascals (2,900–3,600 psi; 200–250 bar), usually in cylindrical or spherical shapes.
The gas is compressed adiabatically with little temperature change (approaching a reversible isothermal system) and heat loss (approaching an isentropic system). This advantage is in addition to the low cost of constructing the gas storage system, using the underground walls to assist in containing the pressure.
If a compressed gas cylinder falls over, causing the valve block to be sheared off, the rapid release of high-pressure gas may cause the cylinder to be violently accelerated, potentially causing property damage, injury, or death. To prevent this, cylinders are normally secured to a fixed object or transport cart with a strap or chain.
A cold gas thruster (or a cold gas propulsion system) is a type of rocket engine which uses the expansion of a (typically inert) pressurized gas to generate thrust.As opposed to traditional rocket engines, a cold gas thruster does not house any combustion and therefore has lower thrust and efficiency compared to conventional monopropellant and bipropellant rocket engines.
Related services and technology can be supplied such as vacuum, which is often provided in hospital gas systems; purified compressed air; or refrigeration. Another unusual system is the inert gas generator. Some industrial gas companies may also supply related chemicals, particularly liquids such as bromine, hydrogen fluoride and ethylene oxide.
This steam or gas engine powered device compressed the gas for injection into the high-pressure mains, which in the early 1900s began to be used to convey gas over greater distances to the individual low pressure mains, which served the end-users. This allowed the works to serve a larger area and achieve economies of scale.
Compression Systems began in 1833 when Charles and Elias Cooper established a foundry in Mt. Vernon, Ohio. "Cooper", as it was known, was licensed to produce the Corliss steam engine in 1869 and entered the production of natural gas internal combustion engines in 1900.
Gas turbine systems compress the intake combustion air. Small-volume purified or manufactured gases require compression to fill high pressure cylinders for medical , welding , and other uses. Various industrial, manufacturing, and building processes require compressed air to power pneumatic tools .
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