40 00 00 Process Interconnections
40 01 00 Operation and Maintenance of Process Interconnections
40 01 10 Operation and Maintenance of Gas and Vapor Process Piping 40 01 20 Operation and Maintenance of Liquids Process Piping 40 01 30 Operation and Maintenance of Solid and Mixed Materials Piping and Chutes 40 01 40 Operation and Maintenance of Process Piping and Equipment Protection 40 01 60 Operation and Maintenance of Process Control and Process Facility Enterprise Management Systems 40 01 70 Operation and Maintenance of Instrumentation for Process Systems 40 01 90 Operation and Maintenance of Primary Control Devices