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NACE - North American Corrosion Engineers

Responsible for standard MR0175 outlining material requirements for sour applications

Further Reading

 

Naphta

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

 

NAS

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

 

NB

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

NCS

Norwegian Continental Shelf

Further Reading

 

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

 

NGL - Natural Gas Liquification

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

Further Reading

 

NIC

National Insurance Contributions

Further Reading

 

NMR

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

 

NOGEPA

The Netherlands Oil and Gas Exploration and Production Association

Further Reading

 

NORM

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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