10 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
Needle valve
Energy; Natural gas
A small globe valve without a separate disc, but with a stem with an integral conical seating surface.
Negative position
Energy; Natural gas
The installation position of a multiport valve such that fluid inlet pressure can be into a closed body opening, thereby retarding vavle sealing.
Nominal pipe size (NPS)
Energy; Natural gas
Dimensionless number used to indicate sizes of pressure pipe and valves - used interchangeably with valve size in inches.
Non-rising stem (NRS)
Energy; Natural gas
A stem design used on gate valve in which male threads on the stem mate with femal threads in the valve gate; turning the stem causes the gate to move, but the stem does not translate (rise).
Operator
Energy; Natural gas
A mechanical device used to reduce the force required to operate a valve manually; also called ona actuator.
Overpressure
Energy; Natural gas
A pressure increase over the set pressure of a pressure relief valve; it is usually expressed as a percentage of set pressure.
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