These soot/un-burnt residues willaccumulate in the smoke tubes if not removed by cleaning. Furthermore, thecombustion quality of the engine is changing together with the load, where the bestcombustion is in the high load range and the lower range is giving a more"contaminated" (black/coloured) exhaust gas. And the more contaminated theexhaust gas is, the more fouling will appear in the smoke tubes. Therefore, it isimpossible to specifY exact time intervals in which the smoke tubes should be sootcleaned. However, some general guidelines are given below:• Inside inspection.• Check of the exhaust gas temperature on the outlet side of the boiler. The boilershould be cleaned if the outlet exhaust gas temperature lies approx. 20°C abovethe temperature in a clean boiler at a specified engine load.• Check of the pressure loss. The boiler should be cleaned if the pressure loss liesapprox. 20 mm WC above the pressure loss in a clean boiler.It is recommended to keep a consecutive record of the exhaust gas temperature andpressure loss related to different engine loads in a clean boiler. These original datashould be used for comparison, and plotted into a measurement chart like the oneshown in Figure I. In this way it is possible to monitor the fouling condition of thesmoke tubes and determine when they need to be cleaned.
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