this project including Five ( 5 ) companion volumes discusses in a very useful manner all the important topics about the important subject of maintenance done almost at a daily basis for plants and facilities, it is made from the carefully selected cream of the crop, quantity, and quality relevant technical material systems and equipment as detailed in the project proposal and outline , and in turn it is expected to be very useful for many readers and audience working in all plants and facilities it is submitted with thanks , and kind regards