Crude carriers are classed in sizes. There are general crude carriers of 35,000 to 160,000 tons, VLCC's for Very Large Crude Carriers of 160,000 to 300,000 tons, and ULCC's for Ultra Large Crude Carriers of 260,000 to 565,000 tons. Another classification system further classifies tankers into the following categories: 1) General Purpose or GP - 16500-25000 DWT; 2) Medium Range or MR - 25000-45000; DWT 3) Large/Long Range 1 or LR1 - 45000-80000 DWT; 4) Large/Long Range 2 or LR2 - 80000-160000 DWT; 5) Aframax - 75000-110000 DWT; 6) Suezmax - 110000-150000 DWT. These classifications can vary slightly between companies and or organizations and are somewhat subjective. But, the tonnages shown are close to those generally accepted in the industry.

Related Terms


A system of gears which alter the ratio between the revolution of the engine and the propeller shaft so the propeller operates in a relatively efficient speed range. By using a gearbox the engine and the propeller shaft will revolve at different speeds.


  1. Any undesired change in the waveform of an electric signal passing through a circuit or other transmission medium.
  2. In general, the extent to which a system fails to accurately reproduce the characteristics of an input signal at its output.
  3. Any undesired change in the waveform of a sound wave.


  1. The time interval between a change in the input signal to a process control system and the response to the signal.
  2. The time interval, after a response to one signal or event, during which a system is unable to respond to another. Also known as insensitive time.


A design technique used in linear control theory in which many or all of a system's closed-loop poles are positioned as required, by proper choice of a linear state feedback law; if the system is controllable, all of the closed-loop poles can be arbitrarily positioned by this technique.


A system for weight measurement in which the load is detected by a nozzle and balanced by modulating the air pressure in an opposing capsule.


A heating or air conditioning system in which air is forced through a plenum chamber for distribution to ducts.


The partitioning of a large-scale control system into subsystems along lines of weak interaction.


A system for which one can divide the range of values of input quantities into a finite number of intervals such that the output quantity is a linear function of the input quantity within each of these intervals.


[CONTSYS] Aphotoelectric control system used as a position regulator for a loop of material passing from one stripprocessing line to another that may travel at a different speed. Also known as loop control.


A photoelectric control system used to sort objects according to color, size, shape, or other light-changing characteristics.

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