ELCOME SMC Helideck Monitoring System

Anti-heeling system for diving support vessel

NPCC Al Maryah

Elcome designed, installed and commissioned a Hoppe Anti-Heeling System for a diving support vessel operated by NPCC.

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Anti-heeling system for NPCC Al Maryah

NPCC had a requirement for a highly efficient and market-proven anti-heeling system to ensure safety of navigation and vessel stability for its diving support vessel NPCC Al Maryah during its chartered operations.

Vessel stability is a highly complex field of science, and its relationship to safety of navigation is dynamic in relation to variable forces resulting from beam winds, waves, turning, heavy-lifting, cargo loading/unloading and other causes. Elcome’s technical team evaluated the ship’s requirements and proposed a Hoppe Anti-Heeling System to NPCC.

Elcome Hoppe Marine Anti-heeling system

Fully automatic anti-heeling operation

The anti-heeling system works by automatically measuring the vessel’s heeling angle and transferring water from one side (port or starboard) to the other to compensate. The water transfer is automatically triggered when the angle of heel exceeds a set value, and the operation continues until the righting moment equals the heeling moment.

The anti-heeling system was designed with two reversible vertical propeller pumps of 31 kW each with a flow rate up to 500 m³/hour. Hoppe Marine’s HOPAC pneumatic rotary type actuators are double-acting and single-acting, with butterfly valves for open/close functions. The actuators can be operated with 7-12 bar standard working compressed air available on the vessel and are driven by Hoppe’s PLC based HOMIP valve remote control system. It acts as the signal hub between all process components and control workstations or other centralised ship management systems via Ethernet TCP/IP, serial RS485 and RS422 interfaces.

In the automatic mode, the system continuously measures the inclination and begins to compensate the heeling angle when the threshold value exceeds ±1.5° heel. The inclination values range from 5° port to 5° starboard.

The 6-inch touchscreen of the HOMIP integrated control unit provides clear, user-friendly and structured visualisation of the fluid systems, including piping, valves, pumps, switches, treatment units and tank contents.

Made for long and continuous anti-heeling operation

The Hoppe Anti-Heeling System is designed and built for reliable performance with very little maintenance under the extreme environmental and operational conditions of a vessel.

Reversible propeller pumps for anti-heeling operation

Two pumps of axial reversible propellers, designed for controlled bidirectional water shift, are used for the operations.

Heel compensation

In automatic mode, the system continually measures heeling angle and compensates with a flow rate up to 500 m³/h.

Elcome Hoppe Marine Anti-heeling system reversible propeller pumps

Hoppe Marine integrated touch screen control unit

The PLC unit with 6-inch integrated touchscreen offers screen layouts for automatic or manual control and can be connected to the ship management system via Ethernet TCP/IP, serial RS485 and RS422 interfaces.

Elcome Hoppe Anti-heeling system

Low CAPEX and OPEX for the anti-heeling system

The Hoppe system is very cost-effective when compared to electro-hydraulic systems. The CAPEX was competitive and required only simple installation work. The OPEX is lower compared to other products since the HOPAC pneumatic actuators use air as control medium and can tolerate humidity inside the system, resulting in reliable performance over the lifespan of the vessel.

Technical facts

Flow rate up to

500 m³/hr

Head (water column)

7 meter

3 Phase motor

31 kW

Heeling angle range

1.5° – 5°