Your Down and Dirty Guide to Kettle and Tanker Inspection and Maintenance. Making sure your workers know the proper guidelines for kettle and tanker inspection and maintenance is extremely important. This new 23-minute video and accompanying workbook will assist you with training your roofing workers and others about proper inspection and maintenance of kettles and tankers. The workbook also addresses worker safety, regulatory compliance issues, and safe transportation methods for kettles and tankers.