What is meant by "4 x NEMA"? 4

[justabitconfused]

I have heard folks refer to something called "NEMA" when referring to nozzle loading due to wind or seismic events. What is this "NEMA" value that is referred to in "X" multiples? Thanks.

 

[SNORGY]

Is it related to a turbine or a pump?

If the former, it means that the manufacturer will accept 4 x the standard NEMA SM23 allowable loads imposed on his / her machine's nozzles.

Regards,

SNORGY.

 

[vpl]

My first thought on "NEMA" was the National Electrical Manufacturers Association.

They can be googled and the standards can be bought

Patricia Lougheed

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[TenPenny]

When I see '4x NEMA', I assume it means NEMA 4X, which is an electrical enclosure rating.

How that would have anything to do with flange loads, I have not a clue.

 

[justabitconfused]

Thanks, the term I have heard used is when referring to a nozzle load on a pump or turbine. I can see the NEMA standard referenced above, I'll look it up. Thank you.

 

[micalbrch]

I recommend to have a look at the old thread no. 378-208759 in the Pipelines, Piping and Fluid Mechanics Engineering Forum-

 

[SNORGY]

Tenpenny:

From the OP:

"I have heard folks refer to something called "NEMA" when referring to nozzle loading due to wind or seismic events."

That is what led me to believe it might have something to do with nozzle loads.

Regards,

SNORGY.

 

[TenPenny]

Well, lookee that. In 1958, NEMA came up with allowable nozzle loads. Here's an interesting discussion. I didn't realize that NEMA would have been involved in nozzle loads.

http://www.pipestress.com/papers/Rotating-Eqp.pdf

 

[SNORGY]

Thanks TenPenny.

This is a very valuable article to me. Thanks for finding it and sharing it.

Regards,

SNORGY.

 

[justabitconfused]

Indeed, thank you a great deal. This is a great forum!