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what is the thickness of a pipe if the inside diameter is 1 1/4" and the outer diameter is 1 3/4"

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1 Answer

A pipe outside diameter is the inside diameter plus the thickness of the pipe.
Just don't forget there are two wall on a pipe to be taken into account.
 
|----------------- 1 3/4" ----------------- |
|---|------------ 1 1/4 " ------------|---|
   T                                                T
 
O.D. = I.D. + 2 x T
 
Hope you can do it from there.