A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z
NH – No Hub
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 NOM Comp. Fitting is actually 5/8″ because pipe has an OD of 5/8″.
NPS – National Pipe Straight threads standard, Same as IPS.
NPSP (Discharge) – Non Point Source Pollution. Nutrients, sediments, toxic substances, and pathogens that degrade waterways. NPS occurs mainly through storm water runoff.
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.
NPSHR – Net Positive Suction Head Required to stop a pump from cavitating. This number is provided by the pump manufacturer.
NPT – National Pipe Tapered thread standard. The same as IPS.
NSF – National Sanitation Foundation
Natural Gas – A colorless, odorless fuel derived from the earth, consisting primarily of Methane (CH4). Odors are added to aid in leak detection.
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.
Negative Pressure – Less than atmospheric pressure.
Net Usable BTU – That portion of a fuel’s heat energy actually transferred into the water by a heater.
Nipple – A short length of pipe installed between couplings or other fittings.
Nipple Extractor – A tool used to unscrew sections of pipe.
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.
Non-CFC Foam – Insulation that minimizes the use of Chlorofluorocarbons.
Non-Ferrous – Not containing iron
Non-Portable – Not suitable for drinking
NPSP (Discharge) – Non Point Source Pollution. Nutrients, sediments, toxic substances, and pathogens that degrade waterways. NPS occurs mainly through storm water runoff.
A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z
Source: “Plumbing Terms” Standard Plumbing Supply. 11 Sept. 2008