Hello Ken,
if the spools are defined in Piping Components then they should be listed as SPOOL-IDENTIFIER in PCF file.
However different option are available in isogen to output spool id. Check Option Switch 39, there is an option to use Spool IDs that are defined in piping or to make ISOGEN to generate them.
I hope this will help.
Please let me know if you will have further questions.
Regards,
Artiom