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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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