It depends what are you looking for:
for design use ANSI B31.x series piping codes, to do layout -ask senior piping designer or read "Plant piping design", to buy pipe according to the standard -use ASTM standards, to do piping hydraulic calc. - Crane had published very good manual...
As it was mentioned, thermal expansion could be a problem. One of the things to look is material used for FLG and Studs (as SS studs versus CS FLG or other way around). That is very problematic on "cold boxes" ( Al heat exchangers). Operators told me that it took them 2 shuts downs to...