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NACE - North American Corrosion Engineers

Responsible for standard MR0175 outlining material requirements for sour applications

Further Reading



An oil distillate. Naphta is an intermediate product between gasoline and kerosene.
It is known as a light product because of the low molecular weight of the hydrocarbons making it up.
Further Reading



US National Aeronautical Society
Produced Hydraulic Fluid Cleanliness Standards NAS 1638 widely used for land based equipment.
Further Reading
Hydraulic Cleanliness Toolbox Page

Natural Gas

Petroleum in gaseous form consisting of light hydrocarbons often found in association with oil.
Methane is the most dominant component.
Further Reading


Navaid - NAVigation AID

Beacon; wave off light etc installed on a platform or rig to warn ship and aircraft of installation

Further Reading



Nominal Bore
Term used when specifying a pipe size.
Further Reading
Pipe Schedules


Norwegian Continental Shelf

Further Reading



Non Destructive Examination e.g. magnetic particle inspection; x-ray etc

Further Reading



Non Destructive Testing e.g. magnetic particle inspection; x-ray etc

Further Reading



National Electrical Manufacturers Association
Leading US trade association which sets standards relating to electrically powered instrumentation.
Further Reading



National Fire Prevention Association
North American non profit organisation
Further Reading


NGL - Natural Gas Liquification

The name given to the process and the associated plant required to make Liquified Natural Gas (LNG).

Further Reading



National Insurance Contributions

Further Reading



Nuclear Magnetic Resonance
A technology used for well logging - amongst other things it allows reservoir fluids (oil gas and water) to be measured.
Further Reading



The Netherlands Oil and Gas Exploration and Production Association

Further Reading



Naturally Occurring Radioactive Material

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


NPSH - Net Positive Suction Head

Minimum suction pressure required by a pump to prevent cavitation

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


NPV - Net Present Value

The cost of a product or system calculated in the present-day currency
Found by subtracting a projectís initial investment from the present value of the cash inflows discounted at a rate equal to the firmís cost of capital.
Further Reading


NUI - Normally Unmanned Installation

Usually used with reference to satellite oil or gas platforms

Further Reading


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