TROUBLESHOOTING SCENARIOS TEMPLATE
F0RM NO
CRO002. Rev. 1
SCENARIO NAME
Fuel Pressure Low – Fuel Circulation Pump Worn Out
SYSTEM NAME
Main & Auxiliary Engines Fuel Supply System
SYSTEM EQUIPMENTS/INDICATORS
/GAUAGES/PANELS/COMPONENTS
Fuel oil system Components:
- Fuel Oil Supply Pumps (two)
- Fuel Oil Circulation Pump No. 1
- Fuel Oil Circulation Pump No. 2
- Fuel Oil Filters (Automatic & manual stand-by)
- Fuel Oıl Viscosimeter
- Fuel Oil Flowmeters
- Fuel Oil Heaters
ER Equipment
- Main Engine
- Auxiliary Engines
- Main Electrical Switchboard
Alarm and Montioring Equipment
- Signal Columns in ER (inlcuding horn alarm)
- ECR Alarm Computer Panel (Alarm System)
- ECR Gauge Panel
SYSTEM DESCRIPTION
The system consists of two supply pumps that supply either HFO
or DO from daily tanks via flowmeter into the enclosed
circulating system. The fuel within circulating system circulates
via circulation pumps through heaters/coolers, automatic and
by-pass filter, viscosimeter to generator engine inlet flowmeter
and main engine. Continuous fuel circulation is established
through main engine and auxiliary generator engines and
returned via pressure regulating valve to vent box (mixing tank).
Fuel from vent box (mixing tank) is lead to suction valve of a
running circulation pump. Consumed fuel from circulating system
is refilled into the system with supply pumps. Higer fuel pressure
in the system is from discharge side of circulation pumps to the
pressure regulating valve. (Fig.1.)
ABBREVATIONS
FO: Fuel Oıl
HFO: Heavy Fuel Oıl
DO: Diesel Oil
ER: Engine Room
ECR: Engine Control Room
ME: Main Engine
AE: Auxiliary Engines
SUPP. PP LCL DISC Gauge: Supply Pumps Local Discharge Gauge
CIRC. PP LCL DISC Gauge: Circulation Pumps Local Discharge
Gauge
CIRC. PP. (Fuel Oıl) Circulation Pump
MSWBD: Main Electrical Switchboard
SYSTEM OPERATING AND ALARM
PARAMETERS
FO pressure at ME & AE inlet: 7,5 bar (Alarm 6,0 bar)
Supp. PP LCL DISC Pressure: 3,2 bar
Circ. PP LCL DISC Pressure: 7,8 bar
ALARM TYPE
When Fuel Oil Low Pressure is activated following alarms and
changes will be triggered:
- You will hear heavy sound in ER
- Signal light column for machinery alarm is illuminated
- Message on ECR computer panel will appear: “FUEL
PRESSURE LOW – 5,8 bar”
- Pressure gauge at ECR gauge panel will show 5,8 bar
- Pressure at CIRC. PP LCL DISC Gauge will show 6,1 bar
PLANT CONDITION BEFORE TO START
SCENARIO
Vessel is undreway at full main engine speed and one auxiliry
engine (generator) is in operation. Fuel is consumed from HFO
Serevice tank and heated to 115 °C. Fuel supply pressure at the
inlet to ME & AE is 7,5 bar. In operation is Fuel Oil Circulation
Pump No. 1 (CIRC. PP. No 1). Following indication is shown before
scenario:
- No any sound alarm in ER – SILENCE (only machinery
noise)
- Signal light column for machinery alarm is NOT
illuminated
- NO Messages on ECR computer panel
- Pressure gauge at ECR gauge panel will show 7,5 bar
- Pressure at SUPP. PP LCL DISC Gauge will show 3,2 bar
- Pressure at CIRC. PP LCL DISC Gauge will show 7,8 bar
SCENARIO
Scenario chronology:
1. Heavy Alarm sound and Signal light column for
machinery alarm is illuminated (Fig.7.)
2. Message on ECR computer panel will appear: “FUEL
PRESSURE LOW – 5,8 bar” (Fig.2. and Fig.3.)
3. Pressure gauge at ECR gauge panel will show 5,8 bar
(Fig.4.)
4. Pressure gauge at CIRC. PP LCL DISC Gauge will show
6,1 bar (Fig.6.)
5. Student will have to press ACKNOWLEDGE BUTTON in
ECR computer panel (Fig.5)
6. The alarm horn will SILENT and light on signal column
will go OFF (Fig.7.)
7. The letters on message on ECR computer panel: “FUEL
PRESSURE LOW – 5,8 bar” will change color to yelloe
letters (Fig.2. and Fig.3.)
8. Student will physically have to go Main Electrical
Switchboard (MSWBD) located in ECR and find starter
for Fuel Oil Circulation Pump No. 1 and Fuel Oil
Circulation Pump No. 2. (Fig.8.)
9. Student will start CIRC PP No.2 on CIRC PP No.2 starter
by pressing green button on starter (Fig.8.)
10. Student will sttop CIRC PP No.1 on CIRC PP No.1
starter by pressing red button on starter (Fig.8.)
11. Messages on ECR computer panel will DELETE: “FUEL
PRESSURE LOW – 5,8 bar” (Fig.2. and Fig.3.)
12. Pressure gauge at ECR gauge panel will show 7,5 bar
(Fig.4.)
13. Pressure gauge at CIRC. PP LCL DISC Gauge will show
7,8 bar (Fig.6.)
FINISHED SCENARIO
PICTURES, DRAWINGS,
SCHEMATICS, ETC.
Fig. 1.: Schematic of fuel supply system
Please attach pictures, schematics, drawings not only for
describing purposes but also software animation.
(eg.);
Fig. 2.: ECR Computer panel
Fig. 3.: ECR Computer panel (screenshoot)
Fig. 4.: ECR Computer panel (screen)
Fig. 5.: ECR Computer panel (Acknowladge button)
Fig. 6.: CIRC. PP LCL DISC Gauge
Fig. 7.: Alarm horn and signal column (Machinery alarm marked with arrow)
CIRC. PP. No 1 Starter
CIRC. PP. No 2 Starter
Fig. 8.: Starters of CIRC. PP. Starters on Main Electrical Switchboard (MSWBD) located in ECR