3.3 Batch and continuous lubricating systems Continuous bypass systems for diesel-engine installations are illustrated in Figures 3. 4 5 In Figure 3. 4(diesel engine) the bottom of the engine-sump tank is connected to the feed np of the pump he purifier by the pipeline e. a heater is fitted to the pining 7 in order to make the oil sufficiently fluid for centrifugal treatment especially when the engine Is cold3.3 Batch and continuous lubricating systems • Continuous bypass systems for diesel-engine installations are illustrated in Figures 3.4. • In Figure 3.4 (diesel engine) the bottom of the engine-sump tank is connected to the feed pump of the purifier by the pipeline. • A heater is fitted to the pining in order to make the oil sufficiently fluid for centrifugal treatment, especially when the engine is cold