I consider the alcohol lines outside of the distillation unit to be class 3. 1. they are up in a pipe rack and off-plot where they will generally not pose a danger to people. 2. 570 is pretty clear to include tank farm/loading piping in their description of class 3 piping.
Information required for classifying pipe may be found using the P&IDs, MSDSs,
NEPA-704 and Client Engineering Guideline Documents. Listed below is the
information needed from each source.
a) The P&IDs have the operating parameters for a given unit.
b) The MSDSs list the Hazard Rating for each...
