Quay Crane Boom to Vessel Anti Collision



For picking-up or for setting down a container, the crane driver needs to be very concentrated to avoid any collision with the upper part of the vessel.
When SIRRAH sensor detects the presence of the upper part of the vessel, it gives a sign to stop the crane functioning.

The system has a high probability of detection.
Should the crane boom approach the upper part of the vessel or the ship drifts towards the crane the system will generate alarms to the control systems OR stop the crane depending on the wiring of that crane. 


- Lower insurance premium
- Prevention of damage and business disruption costs
- Improvement of safety for crane operators, terminal personnel and ship crews 


Two optical sensors and two beacons are installed on both sides of the crane boom.
One SIRRAH sensor in front of one beacon.



When the upper part of the vessel enters the red line, the light emission will be interrupted and the SIRRAH sensor will not receive the signal. The sensor detects this deviation in the received signal and the emergency STOP will be activated. A distance between the crane boom and the infrared beacon should be adjusted to the max speed of the STS just to have enough time to stop the crane. 1m is only an example of installation.


The end of the boom can be fitted with 2 beacons on each side.
The first beacon is used for the SLOW DOWN and the second beacon for the STOP.


* The sensor is not sensitive to the boom bending or flexing.
* Up to +/-5m is authorized for a boom of 50m.
* Long working range up to 50 or 60m.
* No need of any PLC.
* It operates accurately in all weather conditions.

ADVANTAGES compared to a laser scanner solution or a radar solution

* No disturbance with vessel movement
     - The Sirrah sensor and the IR Beacon are fixed on the crane and therefore if the vessel on quay is rotating due to the waves, no alarm is emitted.
     - In contrast, laser scanner systems or radar systems are detecting the original vessel position and its orientation compared to the crane; if the vessel is rotating, that gives a false alarm.

* No disturbance with fog or dust
     - Arck’s infrared system works in all weather conditions. Even if the beacon is covered by dust, it continues working with a lower power.
     - With the laser system, the laser line is reflected by an obstacle. In this scenario, the laser is sometimes affected by dust or rain disabling the detection of the obstacle. Moreover, in the case of dense fog or rain, the laser is able to reflect its light by the fog or the rain itself, and in this case it gives false detection. 

In case of "light" fog

The laser light can be reflected by the drops so the laser system can give a false alarm. In contrary, in the infrared system, the beacon receives the infrared light normally and in a permanent way.

In case of "dense" fog

The laser system has a very high detection of drops and the light will be reflected and give false alarm. In contrast, in the infrared system, there will be a high signal reduction. The system will give indications that the system is no longer operational and that the driver must ensure safety by himself.

In case of a very thin or small obstacle

The laser system can not or rarely detect the thin obstacle. But, with the infrared system, the infrared beam will be cut during a short time and the sensor will detect it.  


2 SIRRAH SENSORS Ref. SC10 (AC10 Sensor included in BO35 protective housing containing power and serial cables) + 2 infrared beacons Ref. BMU-01 (cone of +/-12°) or 4 beacons as option.

Download Application Note

Réalisation SYSTONIC 2008