24 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
Square operating nut
Energy; Natural gas
A nut, usually 2" x 2", which is attached to a valve stem or the pinion shaft of a gear operator allowing use of wrenches to quickly operate the valve.
Steam working pressure
Energy; Natural gas
The maximum working pressure capability of a valve when used with team, provided that the steam temperature does not exceed the maximum for the valve shell material; it is marked on the valve as S, ...
Stem
Energy; Natural gas
The part of a gate valve, globe valve, or diaphragm valve that moves the flow control element.
Stop-check valve
Energy; Natural gas
A lift cheque valve design the also has a stem that can be used to hold the disc against it seat and have the valve function as a stop valve; also called a non-return valve.
Stud
Energy; Natural gas
A bolt, threaded on both ends, often used in bolting together bodies and bonnets or bodies and closures.
Stuffing box
Energy; Natural gas
The annular chamber provided around a valve stem in a sealing system into which deformable packing is placed. Sometimes called packing chamber.
