Surveyor™ Ballast & Service Tanks Level Monitoring

The SURVEYOR™ Ballast and Service Tank Level Gauging System is designed to meet the highest quality standards for accurate gauging. The system monitors level in ballast and service tanks plus draft, with accurate compensation for trim & list. Measurements are based on proven hydrostatic absolute pressure sensor technology.Sensors is hermetically sealed with a patented watertight connection between body and the signal cable. This special type of absolute pressure sensor has been designed for long time stability without any need for calibration. Sensor can be installed from the top or from the side of the tank. The sensors are connected to the TCU control unit through I/O cards with integrated zener barriers (ATEX), as required.

APPLICATIONS

• Container carriers
• Passenger vessels
• Tankers - oil, product, chemicals
• Dry Cargo Bulk Carriers
• Floating docks and cranes
• Offshore vessels and installations
• Integration with anti-heeling systems

ADVANTAGES

• In-tank parts for permanent submersion
• No calibration after installation
• No moving parts
• No venting of sensors
• No maintenance
• Cost effective installation
• High overpressure resistance
• High burstpressure resistance

BASIC FUNCTIONS

LEVEL: When using submerged pressure sensors installed at the bottom of the various tanks, the hydrostatic pressure of the ballast water or oil is the basis for the level presentation. The liquid density has to be keyed by the operator in. The system presents level in each tank with adjustable high and low level alarms - individually per tank, or per group of tanks. Trim and list - measured by either Inclinometers or draft sensors - will compensate the tank level readings for actual trim and list. Due to the automatic trim and list compensation, the sensor can be installed in the best suitable location without considering the tank's flotation centre.

AUTOMATIC STOP OF BALLAST PUMPS: A default set-point signal from the level function of the gauging system can be used for automatic stop of the ballast pumps.

VOLUME: The sounding tables for each tank are a part of the system program. This allows presentation of the volume content in each tank. Adjustable high and low volume alarms are included as well as estimation of tank filling rate and finish time.

WEIGHT: Presentation of weight in each tank is achieved by using the parameters for level and volume. Adjustable high and low weight alarms are included.

ADDITIONAL (OPTIONAL) FUNCTIONS

TEMPERATURE: In heavy fuel oil tanks, temperature monitoring in combination with the pressure sensor will be included.

DENSITY: A heavy fuel oil tank will normally not be empty from one bunkering to the next. Knowledge of the actual oil density will be quite uncertain after some time. In order to improve accuracy of the tank gauging, automatic density measurement by installation of a second sensor in the respective HFO tanks can be recommended. The density measurement will be important when evaluating the bunker quality and in presenting the correct weight of the tank content.

DRAFT GAUGING: A draft gauging installation normally consists of two, three or four sensors with associated flanges and valves. The sensors are installed close to the keel for measurement of the hydrostatic seawater pressure.

ATMOSPHERIC PRESSURE READING: Sensors measuring absolute pressure are used. As reference, a sensor reading the atmospheric pressure is included. The absence of sensor venting avoids humidity inside the sensors, unstable readings and the need for repair and periodic maintenance.

Advantages

• High quality sensor of Titanium, Inconel or StSt
• Hermetically sealed with a watertight connection between body and the signal cable
• No venting, recalibration or maintenance
• Installation from the top or from the side of the tank
• Installation at any location in tank, regardless of the tank’s flotation centre

Features

• Adjustable alarms for low & high level, empty tank detection
• Automatic compensation for trim and list
• Automatic output to loading computer, ballast pumps and valves, anti-heeling system or automation system, integration with valve and pump control system

DownLoad:

TN150005 TCU-TDU-ballast-draft.pdf (198kb)

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