The piping line class is normally specified in the client specifications. Normally all piping spools under one similar application, service conditions like min and max design temperature and pressure, fluid or gas for which the line intended are given one line class to make it easy for the fabricator to make engineering drawings/design/fabrication etc. Check your client specs to see if piping classes specified or if you give the client name maybe I can tell you what B01E stands for. Thanks and regards
Sayee Prasad R
Ph: 0097143968906
Mob: 00971507682668