DAVINIA ALBALADEJO-MORALES Universidad de Murcia
2. La problemática de la secularización para la carrera eclesiástica
Cargo pumps
Manufacturer: Shinko Industries Ltd., Hiroshima, Japan Type: Steam turbine driven vertical centrifugal pump No. of sets: 3
Capacity: 5,500 m3/h at 15 bar Model (Pump): KV500-2
(Turbine): RVR2
Speed (Pump): 1,090 rpm ±3%
(Turbine): 6,983 rpm
Rating: 2,680kW
Governor: Woodward UG 10DM
Introduction
The main cargo pump system consists of three vertical centrifugal single-stage double-suction type cargo pumps. They are situated at the bottom of the pump room and are driven by a single-stage Curtis steam turbine and intermediate shaft passing into the pump room through a gas tight bulkhead gland. The pumps are each equipped with an automatic unloading (stripping) system.
procedure for the Operation of Cargo pumps
pre-Operation Checks
a) The duty cargo officer should notify the duty engineer of cargo pump requirements. The engineers will then make the cargo oil pumps ready for operation.
b) Before the cargo pumps are run-up the duty cargo officer is to:
• Ensure the pump discharge valves are closed.
• Ensure the pump volute casing and separator chamber are primed.
• Open the pump and line suction valves fully.
pump Starting
The starting of the main cargo pump turbines is manually carried out, where the duty engineer operates the steam inlet valve to the turbine to rotate and run it up or shut it down. When a turbine is up to minimum operating speed, control of the turbine from minimum up to its full rated maximum is carried out from a governor control knob (one for each turbine) located on the main control console in the Cargo Control Room (CCR).
Before the cargo oil pump turbines are brought into operation, the turbine casings must be thoroughly warmed through for approximately 60 minutes with all the drains open and proved clear before beginning to slowly rotate the turbine.
Starting
The warm-up procedure will progress until the duty engineer opens the steam inlet valve very gradually, this will start the turbine rotating at a speed of between 100 to 200 rpm. This condition will be maintained for 25 minutes in order to warm-up the turbine and to check over its condition.
a) During the warm-up period if the pump discharge pressure rises above 4kg/cm2 open the pump discharge valve gradually.
The duty engineer will check that there is no abnormal noise or vibration in the turbine and the reduction gear. If an abnormal state is noticed, the turbine will be stopped immediately and the problem investigated.
b) The engineer will trip the turbine(s) by operating the hand trip knob to confirm that the governor control valve closes immediately. The trip will then be reset. The pump discharge valve should be shut before the pump is run-up again.
c) With the warm-up operation completed the engineer will open the steam inlet valve further and gradually raise the speed up to the rated minimum revolutions over a period of 5 minutes. If the pump discharge pressure rises above 4kg/cm2 open the pump discharge valve gradually.
d) The pump discharge valve should be shut before the duty cargo officer tests the emergency trip mechanism on the cargo console in the CCR. The duty engineer will reset the trip when the turbine is fully stopped and the speed setting is at minimum.
The pump(s) will then be restarted as required.
e) When the pump(s) is run-up to its minimum operating speed with the pump discharge valve open accordingly, the duty cargo officer will be informed that speed control of the cargo oil pumps can be made from the cargo console.
Stopping the pumps
a) Decrease the turbine speed gradually down to the minimum rpm on the cargo control console and inform the duty engineer that the pump(s) is about to be stopped.
b) Stopping is possible by operating either the remote stops or the hand trip on the turbine. The pump discharge valve should be shut before the pump turbine is stopped.
c) Close the pump suction valves.
Emergency Stopping
Local Stopping
Pull the hand trip knob so that the spindle moves outward and the governor valve closes through activation of the trip mechanism causing the turbine to stop.
remote Stopping
Press the REMOTE STOP buttons provided at the remote stop stations so that the trip mechanism activates to close the governor valve and stop the turbine, the remote stops are located at the following locations:
• Pump room entrance
• Pump room bottom plates
• Forward end midship manifolds port and starboard
• CCR cargo console, one for each turbine
Additionally, a low-low pressure alarm condition on the IG main pressure will instigate a complete shutdown of the cargo oil pumps.
resetting the Emergency Trip
Before resetting the emergency trip, ensure the following conditions are fulfilled:
• The pump is at the minimum load, ie, the pump discharge valve is fully closed.
• The governor speed setting is at the minimum speed.
• The turbine steam inlet valve is fully closed and the turbine is stopped.
Reset for the trip and alarm functions is provided at the turbine side. An hours run indicator is provided on the control panel at the turbine side.
Section 2.3.1 - Page 2 of 3
Issue: Final Draft - November 2007 IMO No: 9323948
CauTION
The manufacturer’s casing temperature set point of 80ºC will be suitable for cargoes of all temperatures, but if a non-heated cargo is carried, it is advisable to reduce the set point to some 20ºC above the ambient cargo temperature. This will give early warning of system abnormalities and lessen the likelihood of damage to the pump seals.
Alarm and trips for the cargo pump/turbines are as follows:
• Overspeed trip, electrical and mechanical, 113% and 115%
respectively
• LO low pressure alarm, 0.6kg/cm2
• LO low pressure trip, 0.5kg/cm2
• High LO temperature alarm, 53°C
• LO tank low level alarm
• High exhaust steam back-pressure trip, 0.7kg/cm2
• Pump casing high temperature alarm, 75°C
• Pump casing high temperature trip, 80°C
• Pump bearing (upper and lower) high temperature alarm, 85°C
• Pump bearing (upper and lower) high temperature trip, 90°C
• Pump pressure discharge high trip, 16kg/cm2
• Bulkhead stuffing box high temperature alarm, 75°C
• Bulkhead stuffing box high temperature trip, 80°C
• Low inert gas pressure trip, 100mmWG
• Excessive axial movement of the turbine rotor trip, 0.7mm
• Pump rotor vibration trip,
• Pump shaft seal leakage detection chamber high level alarm CauTION
running the pump in the manual condition, that is with the automatic stop of the pump at finish of stripping deactivated, may result in the pump running dry, or running with the discharge valve closed longer than the manufacturer’s recommendation. This may result in serious damage to the pump and its mechanical seals.
Section 2.3.1 - Page 3 of 3
Issue: Final Draft - November 2007 IMO No: 9323948
Deck Operating Manual
Maersk Nautica
2.3.2 CarGO VaLVES
All the principal cargo valves are operated from switches on the Damcos computer workstation in the cargo control room. The switches supply electric power to pilot valves which direct oil from the cargo valve’s hydraulic system to one side or the other of the operating piston of the valve to be opened or closed.
Wafer type butterfly valves are generally used throughout, with lugged type butterfly valves used for ship side valves and manifold connections. Although the manually operated valves in the system are shown, they are not supplied with an indicator. All remotely controlled valves have a status indication on the computer workstation, indicating whether they are open or closed.
The main discharge valve of each cargo oil pump and the stripping suctions from each cargo tank can be controlled and stopped at any position between fully open and fully closed. A position indicator for each valve is provided on the Damcos computer display.
Hydraulic pipes are led directly to each valve from the respective solenoid valve cabinet. In the case of a solenoid control power failure of the valve, it is possible to operate the valves by manually operating the respective pushbutton on the solenoid rack. For emergency use, two portable hydraulic handpumps are supplied.
The following valves have a throttling function with an intermediate position indicator and can be stopped at any position between open and closed:
• Ballast pump discharge valves
• Cargo tank stripping suction valves, excluding the slop tank stripping valves
• Cargo side sea chest suction valve CLV069
The other remote operated valves have only fully open or closed functions with open/closed indication. Also present in the system are a number of manually operated valves.
Refer to Section 2.6 for details on the control of the cargo and ballast valves.
Note: All loading operations are carried out via the Damcos computer workstation, all remote hydraulic valves are operated using the Damcos computer control switches, both for the open/close and proportional type.
All manually operated valves only have their location indicated on the screen display.
Section 2.3.2 - Page 1 of 1
Issue: Final Draft - November 2007 IMO No: 9323948
Illustration 2.3.3a Cargo Pumping System Stripping Pump and Remote Control System
Lower Raise
Cargo Oil Stripping Pump
0 30
rpm Cargo Oil Stripping Pump System Counter
Cargo Stripping Pump 400m3/h H
H
H Pump Room Top
Pump Room Top H
H
Hydraulic Oil Stripping Line Key
H
Accumulator CLV096
CLV094
CLV106
CLV092 CLV097
CLV113
CLV117
CLV118
CLV093
FM
PA PA PA
Air
Steam Pressure Transmitter Steam Pressure Gauge
Discharge Transmitter Discharge Gauge
Suction Transmitter Suction Gauge
Control Air Pump Room
H
CLV132
From Drain Tank
To Starboard Slop Tank via ODME Line Discharge to
‘MARPOL’ Line Manifold
Exhaust Steam Saturated Steam
Steam Supply Steam Exhaust
Steam Control Valve Inlet Pressure
Control Valve
Stroke Transmitter
IP
From Slop Tanks and Eductor Suction
Double Bottom RoomPump
Bilge Suction
Exhaust Pressure Control Valve
CLV133
From Cargo Pump Room Bottom Crossover Line
Section 2.3.3 - Page 1 of 3
Issue: Final Draft - November 2007 IMO No: 9323948
Deck Operating Manual
Maersk Nautica
2.3.3 STrIppING puMp aNd EduCTOrS
Stripping pump
Manufacturer: Shinko Industries Ltd., Hiroshima, Japan
No. of sets: 1
Model: KPH150
Type: Steam reciprocating pump
Speed rating: 25 double strokes Capacity: 125m³/h at 15 bar
Cargo Oil Stripping Eductor
Manufacturer: Teamtec AS, Tvedestand, Norway
(previously Golar)
No. of sets: 2
Type: 8-10-12
Capacity: 500m3/h at 4.0 bar Driving fluid: Water 805m3/h at 14 bar Water ballast Stripping Eductors
Manufacturer: Teamtec AS, Tvedestand, Norway
(previously Golar)
No. of sets: 2
Type: 10-10-12
Capacity: 230m3/h at 2.5 bar Driving water: 950m3/h at 9 bar
bosun’s Store/Chain Locker/Void Space bilge Eductor Manufacturer: Teamtec AS, Tvedestand, Norway
(previously Golar)
No. of sets: 2
Type: 1½-2-2½
Capacity: 11m3/h at 2.0 bar
Driving water: Fire main 13m3/h at 9 bar