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Proper heating of Fuel Oil storage tank - Guideline for ships

The fuel oil ( FO ) storage tanks should be heated taking the following matters into consideration:
(a) Proper heating temperature : Based on the correlation drawing between temperature and viscosity of heavy oil, easy pumping range and depending on the type , FO shall be heated as per HFO analyzing report.

(b) For FO storage tanks, only one tank in use shall be heated in principle, and the next tank shall be heated gradually from the preceding day of the change over.

(c) If steam heating coils are separated into several layers, the tank capacity corresponding to each section of coils shall be grasped beforehand so that the coils in use may be always under the FO level in the tank.

(d) The tank heating steam valve shall be secured properly for the valve not to open by itself by vibration or other reasons.

(e) If cargo is loaded on the tank top, care shall given for the heating not to affect the cargo.

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