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What is meant by "4 x NEMA"?
4

What is meant by "4 x NEMA"?

What is meant by "4 x NEMA"?

(OP)
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.

RE: What is meant by "4 x NEMA"?

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.

RE: What is meant by "4 x NEMA"?

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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RE: What is meant by "4 x NEMA"?

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.

RE: What is meant by "4 x NEMA"?

(OP)
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.

RE: What is meant by "4 x NEMA"?

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

RE: What is meant by "4 x NEMA"?

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.

RE: What is meant by "4 x NEMA"?

3
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

RE: What is meant by "4 x NEMA"?

Thanks TenPenny.

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

Regards,

SNORGY.

RE: What is meant by "4 x NEMA"?

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

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