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TERM
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EXPLANATION
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NEMA |
National Electrical Manufacturers
Association |
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NH |
No Hub
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NKBA |
National Kitchen and Bath
Association |
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NOM |
Nominal. Usually refers to the Inside diameter
of trade sizes of copper pipe and some CPVC pipes. Not for Iron Pipe connections.
For example, a ½" NOM Comp. Fitting is actually 5/8" because ½" pipe has
an OD of 5/8". |
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NPS |
National Pipe Straight
threads standard, Same as IPS |
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NPSP (Discharge) |
Non Point Source Pollution.
Nutrients, sediments, toxic substances, and pathogens that degrade waterways.
NPS occurs mainly through stormwater runoff. |
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NPSHA |
Net Positive Suction
Head Available to prevent cavitation of the pump. It is
defined as:
Atmospheric pressure + gage pressure + static pressure - vapor pressure
- friction loss in the suction piping. |
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NPSHR |
Net Positive Suction
Head Required to stop a pump from cavitating. This number
is provided by the pump manufacturer. |
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NPT |
National Pipe Tapered
thread standard. The same as IPS. |
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NSF |
National Sanitation Foundation
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Natural Gas |
A colorless, odorless fuel derived from the
earth, consisting primarily of Methane (CH4). Odors are added to aid in
leak detection. |
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Neo Angle Base |
A shower base designed to allow the shower
to fit into a corner using minimal floor space while maintaining an elegant
look. |
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Negative Pressure |
Less than atmospheric pressure.
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Net Usable BTU |
That portion of a fuel's heat energy actually
transferred into the water by a heater. |
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Nipple |
A short length of pipe installed between couplings
or other fittings. |
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Nipple Extractor |
A tool used to unscrew sections of pipe. |
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No-Hub Connector |
A connector for no-hub iron pipe consisting
of a rubber sleeve and a stainless steel band secured by hose clamps.
A variation, a neoprene sleeve with two adjustable steel bands, is used
for connecting dissimilar materials, as when connecting new plastic pipe
to an existing cast-iron drainpipe |
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Non-CFC Foam |
Insulation that minimizes the use of Chlorofluorocarbons. |
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Non-Ferrous |
Not containing iron. |
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Non-Potable |
Not suitable for drinking. |
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