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Old 14th August 2014, 18:12
shieldrow shieldrow is offline  
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Join Date: Jun 2010
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Self discharging bulker 2

For those not familiar with the T2's propulsion system I will give a brief description. The T2 was one of a series of tankers constructed by the USA during World War 2. The T standing for the designation 'tanker'. The T2 was turbo-electric drive while T1 was diesal and T3 was straight steam turbine, other designations and types were also built. The T2 came in various guises with the T2-Se-A1 being the most common.
The propulsion system comprised of three main components, a steam tubine generally rotating at a nominal speed of 3600 RPM, driving a two pole AC alternator generating usually 2300V at 60 hertz/cycles and a 80 pole syncronous motor delivering approx 6000 shp at 90 rpm when operating at 60Hz.
Basically a turbine driving an alternator supplying a main propulsion motor. Speed of the main motor was varied by varying the speed of the main turbine which in turn varied the output frequency of the aternator and thus the speed of the main motor. Reversal was by changing over two phases of the AC supply to the motor.
Auxillary power at 440V 60Hz was from two steam turbine alternators each rated at 450kW. Excitation was from two 55kW 110v DC generators and output from the exciters and supply to alternator fields was automatically regulated by rotary amplifiers known as 'Amplidynes'.
So there you have it a virtual floating power plant, capapble with modification of supplying upto circa 5000kW of electrical power at 2300V and/or 440V.

This power was put to good use in the Coral Venture to discharge the cement cargo she carried.

At the time of conversion in Kure, the old oil storage tanks were removed and two new sections one Fwd and one Aft of the bridge were fitted. These sections contained holds or silos for holding the cement and also all the new discharge equipment.
This equipment consisted of four trains (one for each hold). Each train had an airslide blower supplying low pressure air to assist transfer of cement down the sides of the hold and into a cement pump as without these the material would tend to 'stick' to the hold walls. A cement pump, this was a screw pump which fed the cement into a fluiding chamber. A screw pump was chosen for technical reasons, more to prevent air being allowed to enter the hold from the chamber. In the fluidising chamber, high pressure, high velocity air from rotary screw compressors was admitted to the chamber where it mixed with the cement to form a homogenised miture of air/cement.
From the Fluidising chamber a pipe rose up to deck level where hoses to the shore side receiving silo were connected.

The accompaning diagrams show the Coral Ventures modified electrical system (copied and cleaned from original blueprints) and a simple sketch of the unloading system
Attached Images
File Type: jpg Airslide2R.jpg (90.5 KB, 44 views)
File Type: jpg T2 3B2R.jpg (147.8 KB, 31 views)
File Type: jpg T2 3D2BR.jpg (155.4 KB, 28 views)
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