A chemical manufacturing plant in a Class 1Division 1 Hazard Area, required avariety of various glass-lined andHastelloy jacketed vessels to be heatedto 600oF. The jackets are extremely sensitive to rapid changes in temperature, particularly the glass-lined jackets, and could easily crack and break causing significant costs to the manufacturing plant in both time and expense. In addition, the plant wanted to control set points and several other alarm features with remote start/stops including a Delta T control for glass-lined vessels so the desired temperature between the oil temperature and the vessel temperature would not be exceeded and cracking would be avoided.

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