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| Term | Definition |
|---|---|
| Natural Circulation | The circulation of water in a boiler caused by differences in density. |
| Natural Gas | Gaseous fuel occurring in nature. |
| Net Positive Suction Heat | (a.k.a NPSH) The liquid pressure that exists at the suction end of a pump. If the NPSH is insufficient, the pump can cavitate. |
| NOx | Abbreviation for all of the family of oxides of nitrogen. |
| Nozzle | A short flanged or welded neck connection on a drum or shell for the outlet or inlet of fluids; also a projecting spout through which a fluid flows. |
