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
Ball valve
Energy; Natural gas
A type of valve whose flow control element is a ball with a circular passage through it and that rotates 90 deg from open to closed.
Bellows seal valve
Energy; Natural gas
A gate or globe valve that uses a cylindrical metal bellows to hermetically seal the valve against stem leakage.
Block-and-bleed
Energy; Natural gas
An operation done with a double seated valve having a between-seats drain. When the valve is closed (blocked) the drain is opened, allowing the fluid trapped between the seats to drain (bleed) away.
Shell
Energy; Natural gas
The parts of a valve that hold in the fluid - the body, bonnet, cap, and so on. Shell parts are also called presure-retaining parts.
Short pattern valve
Energy; Natural gas
A plug valve design that has a face-to-face or end-to-end dimension less that standard.
Shrinkage
Energy; Natural gas
Internal defect in castings that are internal voids, irregular in shape, caused by volume contraction during solidification. Can be caused by not maintaining a fluid channel to the riser during ...
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