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Energy
Anything related to the production or supply of energy in any form.
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Energy > Natural gas 
union bonnet
Energy; Natural gas
A type of valve construction in which the bonnet is held on by a union nut with threads on the body.
union joint
Energy; Natural gas
A body-bonnet joint in which a femal threaded nut slides over the bonnet and screws onto a male-threaded body, clamping the bonnet in place.
vapor
Energy; Natural gas
A gas whose temperature and pressure are very near the liquid phase. Dry steam is considered a verpor because its state is normally near that of water. (Wet steam is a two-phase ...
venturi port
Energy; Natural gas
A valve bore (port) found on plug valves that is substantially smaller than a full port, approximately 40% to 50% of full bore.
wafer body
Energy; Natural gas
A valve body that does not have "ends," but is held in palce between two flanges by the flange studs.
Positive material identification (PMI)
Energy; Natural gas
A method for cross checking the identity of a piece of material, often using a portable spectrometer, usually with x-rays (TN 9266, nuclear analyzer) or a welding arc (Arc Met ...
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