General Description
All the valves necessary for the operation of the cargo and ballast system are hydraulically operated by separate hydraulic power packs, situated in the hydraulic power pack room in the engine room. Control of the power packs and valve operation is from the IAS, touch screen and key board situated in the CCR.
Cargo System
The hydraulic power unit consists of two main pumps and one topping-up pump.
During normal loading and unloading operations, only one pump is required to meet the demand, while the second pump is put on automatic standby cut in mode and will cut in when the system pressure is reduced to 98 bar. The topping up pump is normally used during forcing vaporization operations.
All remotely operated valves are piston operated, except for the liquid dome and the spray header isolating valves, which are vane type actuators. The supply oil is distributed to 6 solenoid valve cabinets situated in side passageway (port and starboard) and 1 in cargo compressor room. Each cargo tank, manifold area, cargo compressor room and the master BOG station has its respective solenoid cabinet as follows:
No.1 Solenoid cabinet feeds No.1 cargo tank
Valves CL110, 100, CG 105, 106, 107, piston type (butterfly) Valves CS106, 107 piston type (globe)
Valves CP178 piston type (ball)
Valves CL101, 102, 105, CS101, 104, 105 vain type (globe) No.2 Solenoid cabinet feeds No.2 cargo tank
Valves CL210, 200 piston type (butterfly) Valves CS206, 207 piston type (globe)
Valves CS201, 204, 205, CL201, 202, 205 vain type (globe) No.3 Solenoid cabinet feeds No.3 cargo tank
Valves CL310, 300, CG001, 002 piston type (butterfly) Valves CS306, 307 piston type (globe)
Valves CS301, 304, 305, CL301, 302, 305 vain Type (globe) No.4 Solenoid cabinet feeds No.4 cargo tank
Valves CL410, 400, CG601, 602 piston type (butterfly) Valves CS406, 407 piston type (globe)
Valves CS401, 404, 405, CL401, 402, 405 vain Type (globe)
No.5 Solenoid cabinet feeds cargo compressor room Valves CG501, 505, 509, 513, 517, 522 piston type (butterfly) Valves CS501, 504 piston type (globe)
No.7 Solenoid cabinet feeds starboard manifold (ESDS)
Valves CL701, 702, 703, 704, CG701 OF002, 004 piston type (butterfly) 40 litre accumulator with a 78bar nitrogen pressurised bladder distribution block to ESDS valves.
No.8 Solenoid cabinet feeds port manifold (ESDS)
Valves CL801, 802, 803, 804, CG801 OF001, 003 piston type (butterfly) 40 litre accumulator with a 78bar nitrogen pressurised bladder distribution block to ESDS valves.
Hydraulic Power Pack
The unit consists of an oil tank, with the two main and one topping up pumps situated on top of the tank. Return line is fitted with return filter with electric clogging sensor. There is a bank of six accumulators of 54 litre capacity each, pressurised with nitrogen. Each accumulator has a drain valve, in order to drain down to the main tank if required. The system is protected by 1 safety relief valves set at 143 bar, which return to the tank. There are no pump discharge line filters apart from the individual filters fitted at each solenoid cabinet station.
Pressure switches control the pump cut in / cut out, with low oil pressure alarm and pump failure alarms transmitted to the IAS. The oil level in the tank is monitored by a low level alarm switch.
LO tank (1,200 L) for valve remote control system is provided for hydraulic oil storage in the engine room.
When hyd. Power pack for cargo system is failed, those for ballast system can use by open of VR002 and VR003.
In this case, pressure switch signal for ESDS at hyd. Pressure very low should be by-passed manually.
In normal use, VR002 and VR003 must be kept shut.
Pump Settings
Pump cut in 108 bar
Pump cut out 127 bar
Standby pump cut in 98 bar High pressure alarm 130 bar Low pressure alarm 105 bar ESDS operating pressure 90 bar
Relief valve 143 bar
Alarms and Shutdowns
Tag No. IAS Description
VC001 HS No.1 cargo hydraulic pump start VC002 HS No.2 cargo hydraulic pump start VC003 HS Cargo hyd. topping up pump start VC001.1 HS No.1 cargo hydraulic pump stop VC002.1 HS No.2 cargo hydraulic pump stop VC003.1 HS Cargo hyd. topping up pump stop VC001.2 RL No.1 cargo hydraulic pump run VC002.2 RL No.2 cargo hydraulic pump run VC003.2 RL Cargo hyd. topping up pump run VC001.3 XL No.1 cargo hydraulic pump remote VC002.3 XL No.2 cargo hydraulic pump remote VC003.3 XL Cargo hyd. topping up pump remote VC001.4 XA No.1 cargo hydraulic pump abnormal alarm VC002.4 XA No.2 cargo hydraulic pump abnormal alarm VC003.4 XA Cargo hyd. topping up pump abnormal alarm VC001.5 XL No.1 cargo hydraulic pump auto
VC002.5 XL No.2 cargo hydraulic pump auto VC003.5 XL Cargo hyd. topping up pump auto VC004 LAL Cargo hydraulic oil tank low. pump trip VC005 DPAH Cargo hyd. oil filter No.1 diff. pressure high VC006 PI Cargo hydraulic oil tank pressure indicating VC007 PAH Cargo accumulator pressure high
VC008 PAL Cargo accumulator pressure low
VC009 PAL Solenoid valve box No.4 accum. pressure low VC010 PAL Solenoid valve box No.7 accum. pressure low VC011 PAL Solenoid valve box No.8 accum. pressure low VC012 TAH Cargo hydraulic oil tank temp. high
Illustration 1.12.1b Ballast Valve Hydraulic Lines
TO/FROM POWER UNIT FOR CARGO
ENGINE ROOM
POWER PACK FOR BALLAST
SOL. V/V BOARD FOR BALLAST, BILGE, FO SW COOLING SYS WATER SPRAY SYS.
(WW001) (WW002) (WW003)
P T
E / R
(BA224) (BA227)
(CW14)
(OF12) (OF13) (OF11) (OF10)
(OF48) (OF81) (OF76) (OF85)
(ES191)
(CW26) (CW25)
(BA201) (BA203) (BA205) (BA206) (BA204) (BA202) (BA207) (BA208) (ES196)
(CW27) (CW28)
(CW06) (CW10)
(CW101) (CW102) (CW103) (CW18) (BA209) (BA216) (BA217) (BA218) (BA219)
(BA223)
(BA222) (BA220) (BA221) (BA226) (BA202)
(BA022) (BA023)
(BA017)
(BA016)
(BA018)(BA019) (BA013)
(BA012) (BA014)
(BA034) (BA033)
(BA015) (BA011) (BA025) (BA026)
(BA001) (BA010)
(BA028)
(BA006) (BA005) (BA004)
(BA002) (BA003) (BA007) (BA027) (BA020) (BA008) (BA009)
(BA039) (BA040) (BA020)
(BA045) (BA046) (BA021)
(BA228)
(OF08)
NO.4 W.B. TK(S)
NO.3 W.B. TK(S)
NO.2 W.B. TK(S)
NO.1 W.B. TK(S) NO.4 W.B. TK(P)
NO.3 W.B. TK(P)
NO.2 W.B. TK(P)
NO.1 W.B. TK(P)
BOSUN STORE
FWD P/P RM
F.P. TK
B.T. RM
FW D DEEP W.B. TK (P
&S)
UPPER DECK
22084 A/B
PIPE DUCT
Ballast, Bilge, FO Sea Water Cooling and Water Spray Systems
The hydraulic power unit consists of two main pumps and one topping-up pump.
During normal operations, only one pump is required to meet the demand, while the second pump is put on automatic standby cut-in mode and will cut in when the system pressure is reduced to 98 bar. The topping up pump is normally used to maintain the system pressure outside of general operations.
All remotely operated valves are piston operated. The supply oil is distributed to 1 solenoid valve board situated in the engine room. The operation of the valves is conducted from the IAS in the CCR.
Solenoid valve board for Ballast, Bilge, FO Sea Water Cooling and Water Spray Ship Side and other Valves Systems
BA001~023, BA201~209, BA216~228 CW06, 10, 14, 18, 25, 26, 27, 28, 101, 102, 103
BS020, 025, 026, 027, 028, 033, 034, 039, 040, 045, 046, 202 ES191, 196
OF08, 10, 11, 12, 13, 48, 76, 81, 85 WW001, 002, 003
Hydraulic Power Pack
The unit consists of an oil tank, with the two main and one topping up pumps situated on top of the tank. Return line is fitted with return filter with electric clogging sensor. There is a bank of six accumulators of 54 liter capacity each, pressurised with nitrogen. Each accumulator has a drain valve, in order to drain down to the main tank if required. The system is protected by 1 safety relief valves set at 143 bar, which return to the tank. There are no pump discharge line filters apart from the individual filters fitted at each solenoid cabinet station.
Pressure switches control the pump cut in / cut out, with low oil pressure alarm and pump failure alarms transmitted to the IAS. The oil level in the tank is monitored by a low level alarm switch.
Pump Settings
Pump cut in 108 bar
Pump cut out 127 bar
Standby pump cut in 98 bar High pressure alarm 130 bar Low pressure alarm 105 bar
Relief valve 143 bar
The hydraulic system can be used as a emergency back up supply to the main cargo valve system, by opening isolating cross connecting valves which must be kept shut in normal use.
Alarms and Shutdowns
Tag No. IAS Description
VB001 HS No.1 ballast hydraulic pump start VB002 HS No.2 ballast hydraulic pump start VB003 HS Ballast hyd. topping up pump start VB001.1 HS No.1 ballast hydraulic pump stop VB002.1 HS No.2 ballast hydraulic pump stop VB003.1 HS Ballast hyd. topping up pump stop VB001.2 RL No.1 ballast hydraulic pump run VB002.2 RL No.2 ballast hydraulic pump run VB003.2 RL Ballast hyd. topping up pump run VB001.3 XL No.1 ballast hydraulic pump remote VB002.3 XL No.2 ballast hydraulic pump remote VB003.3 XL Ballast hyd. topping up pump remote VB001.4 XA No.1 ballast hydraulic pump abnormal alarm VB002.4 XA No.2 ballast hydraulic pump abnormal alarm VB003.4 XA Ballast hyd. topping up pump abnormal alarm VB001.5 XL No.1 ballast hydraulic pump auto
VB002.5 XL No.2 ballast hydraulic pump auto VB003.5 XL Ballast hyd. topping up pump auto VB004 LAL Ballast hydraulic oil tank low. pump trip VB005 DPAH Ballast hyd. oil filter No.1 diff. pressure high VB006 PI Ballast hydraulic oil tank pressure indicating VB007 PAH Ballast accumulator pressure high
VB008 PAL Ballast accumulator pressure low VB012 TAH Ballast hydraulic oil tank temp. high
Emergency Hand Pump Operation
All the hydraulic position type operating valves have an emergency hand pump connection. There are three portable emergency hand pump units, one available in the engine room, one in the duct keel space and one in the deck store. The isolating valves on the distribution block are first shut off and the hoses of the emergency hand pump fitted to the snap on connectors. Control of direction is via a hand operated change over control block.
Operating Procedure
• Check the oil level in the tank.
• Remove the locking pin off lever.
• Connect the threaded ends (1) to the actuator, “O” or “S”.
• Screw(lock) the decompression lever (3).
• Act on the pump lever with monitoring the pressure on the pressure gauge (2).
• Unscrew(unlock) the decompression lever (3) for decompression of the circuit.
Capacities and Ratings
Pump Model : PL-1317F Tank Volume : 5 Liter Stroke Volume : 17.6 ml Max. Pressure : 130 bar
Weight : 15 kg (Wet Weight : 20 kg)
Illustration 1.12.2a Emergency Shutdown System
NORMAL OPERATION CCR
INTERLOCK OPERATION
EMERGENCY SHUT DOWN SYSTEM
TANK PROTECTION SYSTEM 1
TANK PROTECTION SYSTEM 2 ESDS
TEST
ESDS RESET
TANK LEVEL VERY HIGH &
TANK LEVEL EXTREMELY
MANUAL SWITH MANUAL SWITCH (I.S.) CARGO VAPOR MAIN LINE &
PRIMARY INSULATION SPACE PRESSURIZATION MAIN LINE
EQUAL PRESS.
CARGO VAPOR MAIN LINE PRESS. LOW (3 mbar)
I.S. TYPE DIFF. PRESS. LOW (5 mbar)
I.S. TYPE
VERY HIGH (98.5%) I.S. TYPE SENSOR FIRE CONTROL ROOM --- Q'TY 1 WHEELHOUSE --- Q'TY 1
CARGO TANK LIQ. DOME TOP -- Q'TY 4 CARGO TANK GAS DOME TOP -- Q'TY 4 MANIFOLD --- Q'TY 2 CARGO COMPRESSOR ROOM --Q'TY 1 ELECT. MOTOR ROOM --- Q'TY 1
SHORE CONNECTION VALVE (PORT) Q'TY - 5 ESDS
SHORE CONNECTION VALVE (STBD) Q'TY - 5
FUEL GAS MASTER VALVE Q'TY - 1
AIR RELEASE MAGNETIC VALVE Q'TY - 1
: HONEYWELL SUPPLY EQUIPMENT
SOL. VALVE BOX
INPUT SIGNAL ESDS CONTROL CABINET OUTPUT SIGNAL
NO
NO : NORMAL OPEN CONTACT NC : NORMAL CLOSE CONTACT CCR : CARGO CONTROL ROOM I.S : INTRINSICALLY SAFETY BOILER CONTROL
PANEL NO
BOILER CONTROL PANEL
1.12.2 Emergency Shutdown System
In the event of fire or other emergency condition, the entire cargo system, gas compressors and master boil-off gas isolating valve to the engine room may be shut down by a single control.
Shut down of the cargo system is actuated either manually or automatically by fire or certain off limit conditions.
Description
(See Illustration 1.12.2a)
The manual emergency shutdown push buttons are located as follows:
Cargo Control Room Wheelhouse
Fire control station
Each tank liquid dome (4 units) Deck forward area (1 unit)
Port and starboard manifold platforms (2 units)
Automatic shutdown for fire is controlled by twelve fuse plugs located as follows:
Each tank liquid dome (4 units) Each tank vapour dome (4 units)
Port and starboard manifold platforms (2 units) Cargo compressor room (1 unit)
Electric motor room (1 unit)
There are three ESDS interface connections made to the shore facility, i.e.
electrical, optical and pneumatic. In port, the optical link and pneumatic systems will inform the shore of any ship’s ESDS actuation and will stop the loading or discharge pumps and close the shore liquid valves.
Automatic shutdown occurs when any of the following conditions occurs:
Vapour header pressure falls to within 3 mbar of atmospheric pressure Vapour header pressure falls to primary insulation space header pressure Each tank pressure falls to within 5 mbar of the primary insulation barrier space pressure (Tank protection system)
Each tank pressure falls to the primary insulation space pressure (Tank protection system)
Hydraulic oil press low for cargo valve control system Control air press low for ESDS air control board Ship blackout condition
Extreme liquid level (99% volume) in any tank Automatic shutdown for fire
Shutdown signal from the terminal
! Caution
Before using the blocking switch, determine exactly what has caused the shutdown.
Before using the blocking switch, turn the controls for all crossover valves to the shut position.
Use the blocking switch only when absolutely necessary to recover from an emergency condition.
When the emergency condition is corrected, immediately restore the shutdown system to normal.
When alarm for ESD or tank protection system is activated, following equipment and valves are tripped.
y ESD activation :
- Stop of all cargo pumps - Stop of all cargo compressors - Closing of manifold valves - Closing of fuel gas master valve y Tank protection system 1 activation :
- Stop of cargo pumps of the related cargo tank.
- Stop of all cargo compressors y Tank protection system 2 activation :
- Closing of filling valve of the related cargo tank.