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Control and Instrumentation GlossaryWe have 13 entries in our Glossary for this letter. NACE North American Corrosion Engineers Responsible for standard MR0175 outlining material requirements for sour applications Further Reading Navaid - NAVigation AID Beacon; wave off light etc installed on a platform or rig to warn ship and aircraft of installation Usually initiated by F&G system Further Reading NB Nominal Bore Term used when specifying a pipe size. Further Reading Pipe Schedules NDE Non Destructive Examination e.g. magnetic particle inspection; x-ray etc Further Reading NDT Non Destructive Testing e.g. magnetic particle inspection; x-ray etc Further Reading NEMA National Electrical Manufacturers Association Leading US trade association which sets standards relating to electrically powered instrumentation. Further Reading NFPA National Fire Prevention Association North American non profit organisation Further Reading Noise Any undesirable electrical signal from both external and internal sources. Typical sources include ac power lines; motors; electrical storms; radio transmitters and electrical components. Further Reading Noise Measure of the amount of noise seen by an analog circuit or an ADC when the analog inputs are grounded. Further Reading Non-linearity The deviation from the best fit straight line that passes through zero. Further Reading Notified Body Independent Testing Laboratory recognised to perform tests; audit quality systems and issue reports and certificates of conformity Further Reading NOx - Nitrogen Oxides The term used to describe the sum of nitric oxide (NO); nitric dioxide (NO2) and other oxides of nitrogen which play a major role in the formation of ozone. Further Reading NPT - Normal Pressure and Temperature NTP is used in many thermodynamic calculations and tabulations and is defined as 20 degrees Celsius and 1 atmosphere of pressure. Further Reading |
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