Piping layout furnaces

Vendor data Ail purchased equipment and specialty bulk items (e.g., pumps, compressors, air coolers, furnaces, control and safety v ves, level instruments, strainers, and silencers) require preliminary vendor drawings for the development of piping layouts. Final tonified drawings are usually not required until the detail phase. 

Furnaces, also referred to as heaters, are one of the main pieces of equipment in a process complex. A furnace may raise the temperature of a gas or hydrocarbon liquid to meet specific processing needs or, in the case of pyrolysis and reformer furnaces, cause a chemical or physical change to the medium. A circular or box-type configuration is primarily used variations to each design are covered throughout this chapter. In addition, because of the various types of furnaces, this chapter covers some basics of furnace design and discusses how to approach a piping layout as it relates to maintenance, operation, and safety. 

This section details the piping layout of circular and box-type furnaces. Although such special features as snuffing steam are actually required for both heaters, they are explained for one application only. 

Equipment safety tries to measure the possibility that a piece of equipment is unsafe (Heikkila and Hurme, 1998a). Here equipment includes all major pieces of equipment such as pumps and vessels etc. but not piping, valves or instruments as separate entities. Equipment safety considers the safety of the equipment as such without interactions through the process with other equipment. This latter aspect is described by the safe process structure (Ch. 7.9). However interactions through layout, such as a furnace can be a source of ignition for a leak from other piece of equipment, are considered by the equipment safety. 

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