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 Pipe threads
Author: jimbeau (MN)

Referring to bathtub plumbing...3/4 pipe threads are typically 10 or 14 per inch? What is common? And, what does NC or NF mean?

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 Re: Pipe threads
Author: bernabeu (SC)

pipe threads are NPT or if you are old like me IPS


NC is national course (not a tapered pipe joint thread)

NF is national fine (not a tapered pipe joint thread)





1/2" and 3/4" NPT and/or IPS (they are the same) have 14 TPI and a 1 in 16 taper


[www.engineeringtoolbox.com]

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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

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 Re: Pipe threads
Author: bsipps (PA)

I’m an ips guy as well

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 Re: Pipe threads
Author: bernabeu (SC)

i'll wager 50:50 you even know what 'B' Cu tube is (was)


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B tube had the same OD as IPS but the wall thickness of Cu, it led to oversized piping and significant flow issues and was discontinued

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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638



Edited 1 times.

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 Re: Pipe threads
Author: george 7941 (Canada)

Oversized ID would lead to lower flow velocities. Just curious, what is an example of oversized piping causing issues?

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 Re: Pipe threads
Author: bernabeu (SC)

stagnation - excessive heat loss/gain - increased cost of material (think insulation, hangers, etc)




? why do they not run 3" piping into your home ?

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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

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 Re: Pipe threads
Author: vic (CA)

Cost

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 Re: Pipe threads
Author: george 7941 (Canada)

My question was in the context of copper B tubing not being used anymore. When selecting the appropriate size of B tubing,none of the issues when mentioned - stagnation, heat loss, materials, cost will be a factor since, for example, if 1 in B tubing is oversized, 3/4 B tubing will be specified.

The obvious reason that comes to mind why B tubing is not used any more would be the necessity of its own line of fittings since CTS fittings cannot be used.

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 Re: Pipe threads
Author: bernabeu (SC)

CTS came AFTER B tube

The problem was lack of education when it came to retrofitting galvanized.

Too many times 3" gal was replaced by 3" B resulting in greatly increased ID .................... frowning


etc etc etc

==============================================

"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

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