NEMA SM23 nozzle load 1

[rQuestionEngineering]

It is not understood why NEMA , as a representative of National Electrical Manufacturer Association , was able to govern conditions for nozzle loading.
Nozzle activities are not related to electrical.

How this code was develop and why engineers continue to use electrical code on a mechanical piping scope.

 

[XL83NL]

SM23 is for steam turbines. So mechanical equipment

Huub
- You never get what you expect, you only get what you inspect.

 

[EngrPaper]

SM23 has also been adapted over the years to fit more specific equipment, like API 617 compressors/expanders. You'll notice a lot of similarities between them.

 

[StressGuy]

FYI - NEMA SM-23 no longer exists. API-611 has essentially incorporated the SM-23 nozzle load criteria directly within itself rather than point to NEMA anymore.

As for why NEMA set the standard - the electric manufactures were building power plants with electric generators driven by steam turbines. As there wasn't a nozzle load standard in place, they made one. First mover advantage and everyone else ended up adopting it.

Edward L. Klein
Pipe Stress Engineer
Houston, Texas

"All the world is a Spring"

All opinions expressed here are my own and not my company's.