Saab Marine To Equip Environmental Tankers —Literature Available

"Environmental tankers," as classified by DNV, are now under production.

The first two ships, of Suezmax size, were recently ordered from Daewoo by Nynas Petroleum of Sweden, and Neste of Finland.

Apart from double bottoms and double skins, reliable cargo handling and level gaging are vital to an environmental tanker, and the equipment for these functions is to be supplied by Saab Marine Electronics.

The level gaging system for the nine cargo and two slop tanks on each of the vessels is the proven Saab TankRadar. Level is detected by means of microwave technology, without contact with the product surface, and with sensors for temperature and inert gas pressure connected to the TankRadar deck transmitter. The information from the different sensors in multiplexed and transmitted by a single cable to the processor unit, together with information from other transmitters.

The processor unit also receives input from the electropneumatic level gaging systems for draft, ballast and fuel, supplied by an outside contractor. The processing unit is connected online to the load calculator.

In itself, this would already be a highly advanced system, but in this case, it has been integrated with the Saab MaC/501 cargo control system.

Here, the TankRadar processing unit acts as a substation.

Another substation controls the 11 cargo pumps, two ballast pumps, 44 valves and pump discharge pressure, and both are connected to a control room station.

At the top of the hierarchy sits the operator. There are two operating sites. All operations can take place at either of them, and they have been designed according to the latest advances in man/machine communication. All cargo control is undertaken by touching a light pen to a 20-inch color screen. The valves and meters of yesterday's consoles have been replaced by symbols in mimic diagrams on the screen. A touch to any one of the symbols activates it. When a function, e.g., a pump, is active, different parameters can easily be set. Built-in safety functions prevent the operator from performing invalid functions and operators are also alerted in the event of a malfunction, e.g., a stuck valve.

For free literature giving full information on equipment from Saab Marine Electronics, Circle 22 on Reader Service Card

Maritime Reporter Magazine, page 61,  Sep 1990

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