wartsila o pumps svanehoj variable speed control

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Pump Specification

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  • Svanehj Deepwell Cargo PumpsVariable speed control for product/chemical tankers

  • Speed regulated cargo systemNew system for future demands

    Variable speed control with frequency converters means energy saving and noisereduction.As a leading pump manufacturer Hamworthy Svanehj A/S

    has developed an electrically driven, variable speed

    regulated cargo system to meet the growing demands with

    regard to environment and to achieve optimum perfor-

    mance with various cargo densities and viscosities.

    The fact that more and more shipowners select diesel-

    electric propulsion for their tanker newbuildings makes the

    choice of electrically driven cargo system natural.

    Easy installation, low discharging noise level, and low

    maintenance costs are important factors in building and

    operating the vessel.

    The system operates with a standard frequency converter

    driving the explosion-proof electric motor at the pump.

    The frequency convertersare delivered in a converter

    switchboard, fully wired and ready to be placed in the

    switchboard room.

    Local controlof the cargo system takes place from the

    converter switchboard front.

    The converter switchboard is made with interface for

    remote control panel or interface to the Ships Control

    System (SCS).

    The cargo system is designed individually to suit any tanker.

    Integration of motor starters and speed regulation for

    ballast pump, tank wash pumps and bow thruster in

    converter switchboard is possible.

    The electrically driven, variable speed cargo system is

    available with certificate from any classification society, e.g.

    DNV - LRS - GL - ABS - BV - KR - RS - NK - CCS andR INA.

    Variable speed and energy savings

    Several things indicate that a cargo pump should be

    variable speed regulated:

    - Soft starts and stops give a low pressure influen ce at pipes,

    valves, gaskets and coupling in the discharge system.

    - At cargoes with different densities it is possibel in each

    case to optimize the discharge time. It is always possible

    to have full motor load or full allowable pressure on the

    manifold.

    - Low noise from cargo system while discharging.

    - Energy savings; discharge takes place at fully open valves.

    The energy conservation can be divided into environmental

    and economic aspects.

    Environmentally, the energy conservation consists of less

    pollution, which today is a factor highly weighted (green

    ship/minor degree of CO2 emissions).

    By means of the frequency converter it is possible to adjust

    the speed for optimum pressure and flow, resulting in

    considerable physical and economic energy savings, which

    contribute to increasing the owner's return on investment.

    The frequency operation system can be divided into two

    groups.

    The reason for this is that the classification societies divide

    the ships into zones.

    1.components for non-hazardous area

    2.components for hazardous area covering

    zone 2 - 1 and 0.

    Non-hazardous areas

    This area covers normally the accommodation, wheelhouse,

    cargo control room, engine room, forepeak etc.

    Components mounted in this area are e.g. frequency

    converters, control panel and remote panel.

    Hazardous area

    The other areas are classified in different zones depending

    on the classification rules for each type of ship, but usually

    the pump room will be zone 0 and the deck will be zone 1.

    Zone 2 covers also the deck depending on the rules of the

    classification society in question.

    Zone 0: Permanent presence of explosive atmosphere.

    Motors prohibited (normally pump room).

    Zone 1:Incident presence of explosive atmosphere in

    normal duty (normally deck area according

    to classification rules).

    Zone 2: Presence only by accident (not in normal duty).

    Electrical apparatus are divided into two main grou ps, mining

    and other applications.

    Group I: Apparatus for coal mines.

    Group II: Apparatus for explosive atmosphere

    other than mines.

    Group II is subdivided according to the severity of the environ-

    ment.

    IIA IIC is the highest rating; a motor from one of

    the higher categories can also be used in a

    IIB lower category environment.

    IIC

  • Combustible gas vapour and explosion-protected electrical

    equipment are divided into six temperature classes

    according to the ignition temperature of the gas or vapour

    and the maximum surface temperature of the equipment.

    The temperature classes are T1 - T2 - T3 - T4 - T5 and T6 as

    standard. Svanehj use temperature class T4, which covers

    max. permitted equipment temperature 135C.

    Svanehj use a standard motor with

    explosion class EEXdeIICT4

    EEX - means that the equipment complies

    with the European EN standard.

    d - indicates flameproof enclosure

    e - enclosure "Increased safety" for

    terminal box.

    IIC - indicates that the equipment has been

    tested and classified in gas group IIC.

    T4 - indicates that the surface temperature

    of the equipment does not exceed 135C.

    Screened cables

    Screened cables are used as control cables and motor cables.

    Control cables are screened for electromagnetic

    compatibility (EMC) reasons, to keep an electrical noise

    impulse away from the control system.

    Motor cables are screened for two reasons.

    The first reason is with regard to safety, because the cable

    is drawn in hazardous area (zone 1).

    The second reason is to avoid the EMC interference to

    electrical instrument mounted near the cables.

    (The electrical noise is always kept inside the motor cable.)

    View of installation offrequency converter cabinets

    Pump installation

    Various sizes of frequency converters

    Wiring of e-motor

  • Electrically driven cargo system - with frequency converter

    Svanehj's cargo system is designed for location in 3

    different places:

    Hazardous areas:

    Deck:

    Cargo pumps, electric motors, cabling

    and emergency stops.

    Non-hazardous areas:

    Engine room or converter room:

    Converter switchboard.

    Cargo control room or wheelhouse:

    Cargo control system or remote control panel.

    From the figure above it appears that the converter

    switchboard consists of several identical units.

    Normally each frequency converter is one unit, and

    converters of same sizes are identical units.

    In the upper part of the converter switchboard there is a

    common busbar, which makes it possible to have only one

    common main power supply from the main switchboard.

    If supply current for the cargo system exceeds 2-3000

    amperes, the busbar is then often divided into two parts

    resulting in two main power entries.

    In front of each converter unit a maximum current breaker

    is installed. When making an emergency stop, all the

    current breakers will be deactivated.

    To restart the cargo system after an emergency stop, a

    reset must be done on each unit and all maximum current

    breakers must be switched on again.

    The front of each unit includes display panel, all necessary

    lamps and buttons for local control and operation.

    Usually there will be floating floor in the room where the

    converter switchboard is installed, and all cabling will be

    done from underneath the floating floor up to the

    respective connections.

  • Converter switchboard

    The standard frequency converters are built into an IP 22

    switchboard.

    The switchboard is in a modular design to minimize the

    physical size.

    In the switchboard there is a common copper busbar to

    istribute the power to each frequency converter.

    Supply to the busbar is taken directly from the mai n

    switchboard.

    All cable connections are made from the bottom of t he

    switchboard.

    At delivery the converter cabinet is divided into h andy

    transport sections.

    Safety for cargo system

    The primary safety for avoiding damage to the cargo

    system is handled in the converter switchboard.

    - e-motor overload protection

    - maximum pressure on cargo pipe system

    - emergency stop

    Interface

    Interface for Ships Control System or for remote c ontrol panel

    consists of:

    - NO/NC-signals (Normally open/normally closed)

    - 4-20 mA galvanic isolated signals

    - Current transformer signal

    (for amperemeter in remote control panel)

    Frequency converter switchboard mounted at top deck in engine room.

    Remote control panel

    Frequency converter control panel

    Loadmaster on duty

  • Frequency converter

    The frequency converter is a power electronic unit, which

    transforms alternating current with a fixed frequency into

    an alternating current with variable frequency.

    The e-motor speed depends on the frequency.

    If you have a variable frequency, then you are able to

    regulate the motor speed. The frequency converter has a

    programmable start ramp, which makes it possible to

    change the timer for the soft start.

    Frequency converter

    - power input

    When starting the pump, there

    will be no high starting current

    demand to the ship generators.

    The absorbed supply current will

    not exceed the nominal motor

    current.

    If the technical data for the

    generators are given, it is

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