Smith,

Pl. read and understand the code.The piping codes are not books on theory of relativity which are difficult to comprehend.There are ample supporting documents also like the book by Charles Becht, George Antaki and also Compansion guide to ASME Boiler and PV codes Edited by K.R.Rao. There are WRC Bulletins also like WRC 329 for example. If after reading all these you have confusions and questions, ask them.

I totally agree with Craig. Few days back somebody wanted to know baout piping spans.I agree that the person is new to this field, but from basic strength of materials he/she should be having some idea on the the first approach to estimate piping span, however the person did not feel like doing that much homeowork and decided to put the question in the forum.

Regards