Anti-Heeling & Propulsion SystemsMarine/Products

ANTI-HEELING SYSTEM

UNDER MARINE

This system is designed for both automatic and manual control of a vessel's list during loading and unloading operations.

The system automatically rebalances the vessel using feedback from the inclinometer by transferring ballast water from starboard to port, or vice versa.

✔ Container Vessels

✔ Tankers

✔ FPSO and FSO Units

✔ Offshore Support Vessels (OSV)

✔ Naval Vessels

✔ Passenger Ferries

✔ Heavy Lift and Cargo Ships

GENERAL ANTI-HEELING SYSTEM FUNCTION

The Anti-Heeling systems operates with reversible or non reversible pumps and corresponding Remote Controlled Valves.

The complete systems includes:

✔ Anti-Heeling Control Panel

✔ Pump Starter Panel

✔ Inclinometer Box

✔ Heeling Pump

✔ Heeling Valves

✔ Level Transmitter

✔ Level Switch

The Anti-Heeling System AH2000 & AH2000i can work in conjunction with the stability control system and the valve remote control system for bilge and ballast valve control, the precision heeling sensor, mounted athwart to the ship's direction and supplies the heeling angle signal to the master PLC.

The master CPU is housed in a flush mounting box (600 × 600 × 300mm). The front panel includes hardwired selector switch for mode selection, lamp test and mimic panel.

The ballast pump will start only upon receiving a confirmation signal that both corresponding valves (BW170V and BW173V, or BW171V and BW172V) are open. These valves are controlled by the Master PLC or through the Central Vessel Management System (CVMS) / ICSS.

By pumping from:

✔

Starboard to Portside

Valve BW170V and BW173V is Open.

Valve BW171V and BW172V is Close.

✔

Portside to Starboard

Valve BW171V and BW172V is Open.

Valve BW170V and BW172V is Close.

✔

Anti-heeling control system

Only "Enabled" when the pump starter is in "Operation Mode".

✔

Failure of such will render the system "Not Operational"

OPERATION MODES

Automatic Operation

In automatic mode, the pump and valves are automatically controlled to transfer water athwart ships in order to counteract the vessel's heel.

If the heel angle reaches the preset "Starting Angle" (adjustable between ±0.5° and ±2°), the system will automatically start the heeling pump and activate the relevant control.

After the vessel is re-balanced to 0°, the heeling pump will not shut down immediately. The pump will continue running for a preset time delay while waiting for any further rebalancing requirements.

During this period, the valves remain open for bypass operation, allowing water to circulate continuously through relevant heeling tank in a closed loop.

Manual Operation

This mode provides standalone direct operation independent of the Touchscreen/PLC. When MAN mode is selected, the pump can be activated or stopped by operating the corresponding direction push button.

Emergency Stop

When the Emergency Stop button is activated, the pump will stop immediately and all valves will be closed.

FAULT REACTIONS

✔ Heating angle exceeds 4°

✔ Low Water Level

✔ Independent/Emergency-Stop Device

BI DIRECTION ANTI-HEELING SYSTEM

General System Function And Working Principle – Bi-Directional Pump Design

The Single Pump with 2 Valves configuration is based on a bi-directional pump design. System operation is generally similar to the single-direction pump arrangement.

KEY BENEFITS

✔ Automatic vessel stability correction.

✔ Improved vessel safety during loading and unloading operations.

✔ Reduced heel angle and cargo shifting risks.

✔ Lower crew intervention requirements.

✔ Seamless integration with PLC, ICSS and Vessel Management Systems.

✔ Reliable operation for offshore and marine environments.

ADVANTAGES

✔ Less components translate to less areas of failure.

✔ Lower design cost both for the System itself and for the vessel.

✔ Occupies less space on board the vessel.

✔ Pump sizes are generally smaller compared to single-direction pump systems.

DISADVANTAGES

✔ A reversible motor is required, which may result in a shorter motor service life.

✔ Usage of VFD is unlikely as cost of VFD is high including harmonics filtration.

✔ Braking and reversing operation may introduce delays that are not desirable in certain applications.

✔ Water hammer to pumps may be possible due to sudden stop/start applications and resulting in more costly pumps and designs.

✔ Every system has its pros and cons and designers of systems will have to decide carefully on the application.

✔ No single system is suitable for every application. Systems selection should be based on operational requirements, performance expectations and project constraints.

MOWE PROPULSION SYSTEM

From switchboards and motor control centres to complete propulsion systems, MOWE has established extensive experience in power and propulsion solutions.

Electrical Propulsion is a system used in most modern ships to generate thrust through propellers driven by two-stroke or four-stroke diesel engines, outboard motors, and gas turbine engines.

ADVANTAGES

✔ Produce lower emission compared to conventional marine propulsion systems that rely on heavy fuel oil.

✔ The propeller shaft of the ship is connected to large motors, which can be D.C or A.C driven and are known as propulsion motors. Power for propulsion motor is supplied by the ship’s generator and prime mover assembly.

✔ Years of experience have enabled MOWE to supply MV/LV systems, MCC and Propulsion systems while performing the necessary design, harmonic control and braking control functions.

✔ Application of high end products, developing the best solution for clients, working with the best partners in the industry (ABB, Siemens, Vacon, Schneider).