Storage and Transportation Operations (9.24)
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Basic knowledge of oil blending: To prevent freezing of oil tank heaters, ( ) can be pumped into the tank to melt them； Valves and pumps that have frozen can be thawed using ( ) or ( ); forced use is not allowed.
If the oil tank heater freezes, hot oil can be sent into the tank to melt it； Frozen valves and pumps can be thawed using (steam) or (hot water); forced use is not permitted.
Hot oil, steam, hot water #Reply quickly here#