The stationary seating surface, the inlet of a valve.

National Pollutant Discharge Elimination System

National Pollutant Discharge Elimination System. EPA's NPDES vessels program regulates incidental discharges from the normal operation of vessels. The NPDES vessels program does not regulate discharges from military vessels or recreational vessels. Inste ...

National Pollution Funds Center.

Notice of Proposed Rulemaking.

ACRONYM - National Pipe Thread standard. A description of a specific pipe thread

ACRONYM - National Pipe Thread tapered. A description of a specific pipe thread

Net Present Value

Not Required.

National Research Council

National Response Center

A wind scale adapted by the U.S. Forest Service for use in the forested areas of the northern Rocky Mountains (NRM). It is an adaptation of the Beaufort wind scale. The difference between these two scales lies in the specification of the visual effects of ...

Classification character for a ship which had been built under the Society/s survey but has been subjected to survey for classification of the Society/s surveyors.

National Shipping Company of Saudi Arabia.

National Science Foundation

National Strike Force Coordinator

National Shipbuilding Initiative.

Net Standard Volume

Net Standard Weight

Net Tons