Write 5 pages thesis on the topic engineering operations and maintenance. Lubricants have a number of applications. To start with are used to keep the moving parts of a machine apart so as to reduce the possibility of surface fatigue and friction. This is achieved by forming a layer between the surfaces that act as a barrier. Secondly, lubricants are used to transfer heat. Liquid lubricants are effective in this application due to their ability to hold heat (heat capacity). Finally, lubricants are used to prevent corrosion. such lubricants have additives which chemically form bonds with metallic surfaces in order to exclude air and moisture from reaching the surface.
Gravity feed is a lubrication system that uses gravity to move liquid substances from one point to another. This is a relatively simple method of moving fluids without necessarily using a pump. This is commonly applied in fuel supply to internal combustion engines by simply placing the fuel tanks above the engines (mostly in motorcycles). Such systems are made up of a loosely covered manifold which is placed on top of the bearing that regulates the amount of oil supply at certain intervals. This supply is controlled by a conical valve that is adjustable when necessary and is connected to a reservoir which is often refilled when the oil level drops (Rudnick, 2005).
In this system of lubrication, the lubricant (oil) is pressurized to move from one point to another. It is mostly used in machines that operate at relatively high speed and those associated with movement of heavy loads. A high and fast flow of oil is required to protect such machines from overheating caused by friction. Gearboxes and turbine generators are major examples of machines that use this system of lubrication. Thus, to maintain the flow of oil in such systems, the pump often takes the lubricant from the reservoir, clean it up and return it back to the reservoir. .