Applying the ASME Codes: Plant Piping & Pressure Vessels (Mister Mech Mentor, Vol. 2)
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The term “jacketed piping” refers to a pair of pressure pipes, consisting of a smaller diameter pipe nested coaxially inside a larger diameter pipe. The larger, outer pipe is called the “jacket” and the smaller, inner pipe is called the “core” (see Figure 10-1).
The “core fluid” is the hot material being transported in the particular process. An example would be molten plastic or polymer being pumped to extrusion dies to make fibers or bulk chips.
The “jacket fluid” serves as thermal insulation, and typically is supplied to the jacket as saturated vapor of one of the commercially produced heat transfer oils, such as one of the DowTherms. A typical hot oil vapor jacket fluid temperature would be 550°F (290°C.) Pressures are typically moderate, depending on specific fluids used and the process temperature requirements. Although the active jacket fluid is normally in the vapor state, it may be pumped through as a liquid. A hot oil boiler system generates the vapor from pumped condensate return.