I know NPS is the piping size. Does it apply to tubing as well. If not, what is the size standard for tubing. I am always confused by piping and tubing. Any easy way to distinguish them?

 

Gary,

I used my preferred Internet search engine with the following search term:

"what is the difference between pipe and tube size?"

(with the double quotes)

I learned that the O.D. of a piece of tubing is generally equal to the size of the piece of tubing. And the wall thickness of a piece of tubing can vary which will also vary the I.D.

As you mentioned, NPS is kind of confusing, but it is a "standard" nonetheless.

Most Internet search engines can display results for questions. Using double quotes usually forces the search engine to look for the specific term inside the quotation marks, while not using double quotes can return results with any of the words in the search term.

Hope this helps!