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| iron-constantan(thermocouples) | |
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| Institute of Electrical & Electronics Engineers | |
| imperial gallons(British) | |
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| Instrument Society of America | |
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| maximum allowable working pressure | |
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| metal arc welding (inert gas) | |
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| magnetic particle examination | |
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| National Association of Manufacture(US) | |
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| National Bureau of Standards(US) | |
| American National coarse thread | |
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| National Electrical Code (US) | |
| National Electrical Manufactures Association (US) | |
| National Electrical Safety Code(US) | |
| American National Fine Thread | |
| National Fire Protection Association(US) | |
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| National Standard Straight Pipe Thread | |
| net positive suction head | |
| net positive suction head available | |
| net positive suction head required | |
| National Standard Taper Pipe Thread | |
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| piping and instrumentation diagram | |
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| poly vinyl chloride lined | |
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| Tubular Exchanger Manufacturers Association | |
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| tungsten arc welding(inert gas) | |
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| unified national coarse thread | |
| unified national fine thread | |
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