Contents 15.1 Governors and governor gear 15.1.1 Introduction 15.1.2 Basic principles 15.1.3 Basic governing terms 15.1.4 Typical governors 15.1.5 Application requirements and governor selection 15.1.6 Typical applications 15.1.7 Conclusion 15.2 Starting gear and starting aids 15.2.1 Introduction 15.2.2 Unaided cold starting ability 15.2.3 Improving the unaided cold starting ability 15.2.4 Engine cranking requirements 15.2.5 Methods of starting 15.2.6 Starting aids 15.3 Heat exchangers 15.3.1 Introduction 15.3.2 Operating conditions 15.3.3 Water-cooled systems 15.3.4 Evaporative systems 15.3.5 Temperature control 15.3.6 Air-cooled systems 15.3.7 Heat transfer 15.3.8 Construction and design 15.3.9 Materials 15.3.10 Corrosion 15.3.11 Maintenance 15.3.12 Water treatment 21761_15a