The oil-tank cleaning process is one of the essential tasks performed in Oilfield Service industries. It is for maintaining the efficiency and safety of the drilling rig equipment. The proper tank cleaning process can reduce harmful waste generated from tank bottoms and allow the recovery of hydrocarbons. The important objective of cleaning equipment is to renew drilling rig equipment and removal of excess oil, grease, sludge and other substances. https://gumroad.com/evoilfieldservices/p/oil-rig-drilling-pre-requisites-of-tank-cleaning