A multi-processor computer system is described in which transaction processing is distributed among multiple protocol engines. A controller 33 in communication with a plurality of valves initiates a backwashing mode such that upon opening of the drain valve V3, fluid within the upper chamber 31 of the pressure accumulator is driven back towards the sediment filter to backwash the filter screen thereof. The storage circuit compresses a user data block into a compressed user data block before storing the compressed user data in one of the physical data blocks, leaving an unused block portion of the physical data block. The cooling system removes heat from the circulating flowstream, thus lowering the process vessel temperature, faster than cold nitrogen injection methods. The power supply generates electricity when the temperature of the vehicle component achieves an initial threshold temperature that is less than the predetermined temperature.