This publication describes those procedures and precautions for gas freeing@ entry into@ cleaning@ and exiting from non portable atmospheric and pressurized petroleum storage tanks. The practices described in this publication are intended as a guide for personnel engaged in these activities. These are considered necessary for the safety and health of personnel and for the prevention of property damage. It is recognized that circumstances will determine the specific application of the procedures described. This publication does not apply to refrigerated storage. Further information on floating roof tanks is available in API Publication 2015B.
API PUBL 2015-1985 history
1991API PUBL 2015-1991 Safe Entry and Cleaning of Petroleum Storage Tanks (FOURTH EDITION)