6 Terms
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Natural gas
Natural gas is a naturally occurring hydrocarbon gas mixture consisting primarily of methane, with up to 20 % of other hydrocarbons as well as impurities in varying amounts such as carbon dioxide. Natural gas is widely used as an important energy source in many applications including heating buildings, generating electricity, providing heat and power to industry, as fuel for vehicles and as a chemical feedstock in the manufacture of products such as plastics and other commercially important organic chemicals.
Industry: Energy
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Natural gas
hydraulic actuator
Energy; Natural gas
A valve actuator that uses pressureized liquied as its energy source.
hydrostatic test
Energy; Natural gas
A pressure test in which a valve is tested with water to detect leaks - may be a shell test or a seat closure test.
inherent flwo characteristic
Energy; Natural gas
The flow characteristic of a valve if the pressure drop across the valve is held constant.
inside rising stem (ISRS)
Energy; Natural gas
A stem design in which male threads on the stem mate with femal threads in the valve bonnet; turning the stem causes it to move out of (rise) or into the valve.
inside screw, rising stem (ISRS)
Energy; Natural gas
Common term for any valve design in which the stem threads are exposed to the fluid below the packing and the stem rises up through the packing when the valve is opened.
installed flow charasteristic
Energy; Natural gas
The flow characteristic exhibited by a valve when the valve is installed in a pipeline. (The pressue drop across the valve varies.)
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