Success Stories

(Water being discharged from trial
unit, on 500mw turbo generator)




This paticular nuclear power station differs from other stations where trials have been held by virtue of its geographic location in relation to our base in South Yorkshire and also by the fact that it is Nuclear powered and therefore subject to a more rigorous security policy. This has meant that we are limited to results from samples taken by the station staff and the sampling regime is not quite as comprehensive as we would normally do when we are totally dedicated to this task. However the simple truth of the matter is the trial unit was installed on 9th July 2009 and a sample taken from inlet side of unit, this sample although of good colour was certainly cloudy. A sample was then taken on the 10th July and by this time the oil was clear and bright. A sample was taken PM on the 11th as turbine was being run up to load and the subsequent analysis of this was 647ppm. On Monday the 13th a sample was taken and analysed the resultant contamination level was some 39ppm. Although some 40 hours had elapsed between samples the results are still superb and show levels of oil purity that Heysham 2 has never experienced before.

The trial continued and the results continued to show that the water level was maintained under the bacterial formation level. After a period of weeks it became apparent that although the Seal Oil was fed from the same source i.e  the main lubrication oil tank because it was separated by a baffle plate it was in fact creating its own micro tank system within the main tank and the level of water within this micro system was at some 700ppm. A decision was taken to combine both main lub oil tank and seal oil offline filtration points and effectively clean both systems simultaneously. The trial has now been running for 14 weeks and as is shown by graph both systems are being maintained at below bacterial formation levels.

The other positives to come out of this extended trial are the facts that the System Health monitoring devices fitted are showing no deteoriation in any of the three operating phases thereby indicating a zero consumable spend. 



The trial started at 14:15 hrs on the 20th 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 the power stations own 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 22nd 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.



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