Pipe size ( (1 1/4" , 1 1/2" , 5" ) not reccomended on ANSI standard ?

[Luigi De Micheli]

Dear all, in the past i seem to recall an ANSI standard wrote ( pipe size 1 1/4" , 1 1/2" , 5" ) were not reccomended. Something of us remember what is this ANSI standard ( sorry for my english) ?

 

[JStephen]

1-1/4 and 1-1/2 are not uncommon pipe sizes. I've never seen a 5" pipe used anywhere. My fitting catalog shows a 3-1/2" that I've never seen in use.

 

[XL83NL]

5" is an odd size, but we have used, mainly because our scope of work is in the (somewhat) smaller linesizes, and as such, 5" may occasionally be needed, e.g. for a control valve.

 

[EdStainless]

We make stainless tubing for people in 1 1/4 and 1 1/2 pipe sizes, likely because there isn't product out there.

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P.E. Metallurgy, Plymouth Tube

 

[3DDave]

If you haven't seen it recently in your work then the reason for making that recommendation probably does not apply.

A chart of ANSI pipe sizes clearly shows 5 Inch pipes in a full set of wall thicknesses, not something likely to happen if there was a reason to avoid it. Or maybe it was some very specialized application that is outside what your work entails, which is why you haven't seen it recently.

For example 4-1/2, 7, 9, and 11 inch are only listed in a small number of wall thicknesses; I would expect them to be not preferred.