Coal fired Power Station

THE TRIAL

The trial started at 14:15 hrs on the 20^th January 2009 and it was estimated that the tank which we believe to have a capacity of approx 42,00 ltrs and holding at that time 28,000 ltrs, the pump was regulated to between 3.5 to 4 m3/hr and the oil drawn from the base of the tank and returned to the same vessel at the top. At start up a sample was taken from the inlet of the unit and subsequently analysed by  power tation personnel in the site laboratory and was found to have a moisture level of 1,141ppm. A sample was taken from the outlet of the unit was taken after allowing three hrs running for conditioning of the coalescer’s this had a moisture content of 72ppm. The unit was allowed to run overnight and samples were then taken these showed levels of 174ppm at the inlet and 67ppm at the outlet, after a further two hours two more samples were taken these values where 99ppm at the inlet and 68ppm at the outlet. A graph depicting these results is included overleaf. The visual appearance of the samples showed the inlet samples to be cloudy and dull obviously the higher the count the more pronounced the turpidity. The outlet samples where all clear and bright in appearance, a pictorial view of the samples is also included. The unit was left running and we would expect to see a reduction in the inlet level of moisture down to 70ppm, this will be sampled on the 22^nd January 2009. At no time during the trial did the pressure differential reading across the filtration element exceed 0.07bar we can only conclude that there was very little particle contamination in the +10 micron range.