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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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