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Hi there, and welcome to this lecture on process flow diagrams, letter and number designations. My name is Marina Miletic. In this lecture, well look more closely at the letter and number representations for equipment. Lets go back to our original process flow diagram for the production of ethylene oxide. You may have noticed that next to each piece of equipment, theres a unique letter followed by a dash and a 3-digit number designation. This is because for identification purposes, each piece of equipment is given a letter and number. As an example, lets look at heat exchanger E-101. The letter is the abbreviation for the type of equipment, whether its a compressor, tower, heat exchanger, reactor, turbine, or furnace. All heat exchangers are designated by the letter abbreviation E. Just to review, the letter designations for all pieces of equipment are shown here. As part of the letter and number designation, the letter must be followed by a dash, followed by a 3 or sometimes 4 di