HFO TO MDO CHANGE OVER PROCEDURE.docx

HFO TO MDO CHANGE OVER PROCEDURE

Main Engine and Auxiliary Engine

Changing Over At Sea

1. Check quantity of MDO in MDO service tank. 2. Check water or sludge by draining MDO service tank (valve no.FD055). 3. Close steam heating to the HFO service tank ( 4. Reduce the Engine load to 40% of MCR-load 5. Close following steam tracing line valves for M/E and A/E fuel oil lines in purifier room. (Valve nos.TH299-FO SUPP UNIT, 322-ME F.O SERVICE SYS, 323- ME F.O SERVICE SYS,324-AE FO SERVICE SYS,325-ME FO RETURN SYS,326-AE FO RETURN SYS,  V081-MIX COLOUMN COLOUMN STEAM TRACING ,V080-STEAM TRACING FOR AUTO AUTO BACKFLUSH FILTER) (154V- ME FO LINE STEAM TRACING TO BE SHUT. LOCATION NEAR M/E MANOEUVRING PLATFORM) 6. Regulate the steam inlet to the fuel oil heater to achieve the oil outlet temp not less than 750C. 7. When said temperature is achieved open the MDO to system by opening MDO Service tank outlet v/v and by changing the position of 3 way valve (valve no.ZS). 8. Open Valve Nos. V300(Location : Purifier room) & 150V (Location : ECR Platform FWD port near HSFO service tank) to No.2 HSFO Fuel oil service tank in fuel oil return line. 9. Close Valve no. V301 (Location : Purifier room) in fuel oil return line to Mixing Column. 10. After completion of changeover Open valve V301 and close valves V300 & 150V. Changing over during Standstill 1. Stop preheating 2. Same temperature levels as said during change over at sea is to be maintained 3. When said temperature is achieved open the MDO to system by changing the position of 3 way valve (valve no.ZS). 4. Start F.O supply pumps and circulating pumps if they are not running change the return of main engine to HFO service tank in use 5. About 0.2 m3 of oil to be flushed through the Mixing column and fuel oil lines

6. It is sufficient enough to change that ME return back to mixing column after 1520min

Boiler 1. Check quantity of MDO in MDO service tank. 2. Check water or sludge by draining MDO service tank (Valve no.FD055). 3. Open MDO service tank valve to aux blr FO supply pump (Valve no.FL187V) 4. Make sure that valve no.FL188 is open. 5. Shut the steam tracing for boiler FO service system. (Valve no.TH 328- aux blr FO service system,TH329-Aux Blr FO service system,TR350 DRN From AUX.BLR FO return system,TR348-DRN From Aux Blr FO Service System,TR-349 DRN From Aux Blr FO Service System) 6. Shut the steam inlet valve (TH 227) boiler FO heater 7. When oil temp is about 750C open the MDO to system by changing the position of  three way valve (valve no.PB MP 2114). MDO TO HFO CHANGE OVER PROCEDURE

Main Engine and Auxiliary Engine

1. Fill service tank and open steam to bring temperature of service tank about 750C

2. Reduce the engine RPM to 40% of MCR 

3. Regulate steam to fuel oil heater so that the outlet diesel oil temp is not more than 800C or the viscosity of oil should not drop below 3cSt

4. Open steam tracing lines for M/E and A/E fuel oil lines in purifier room (Valve nos.TH299- FO SUPP UNIT,322-ME F.O SERVICE SYS,323- ME F.O SERVICE SYS,324-AE FO SERVICE SYS,325-ME FO RETURN SYS,326-AE FO RETURN SYS,  V081-MIX COLOUMN STEAM TRACING ,V080-STEAM TRACING FOR AUTO BACKFLUSH FILTER) 5. When said temperature is achieved open the HFO to system by changing the position of 3 way valve (valve no.ZS).

Boiler 1. Open the steam tracing for boiler FO service system (Valve no.TH 328- aux blr FO service system,TH329-Aux Blr FO service system,TR350 DRN From AUX.BLR FO return system,TR348-DRN From Aux Blr FO Service System,TR-349 DRN From Aux Blr FO Service System)

2. Open the steam inlet valve (TH 227) boiler FO heater

3. When oil temp is about 750C open the HFO to system by changing the position of  three way valve (valve no.PB MP 2114).