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Many control problems are arising in chemical process industries due to the nonlinear dynamic behavior. The spherical tank system is one of the most enduringly popular and important process used in chemical industries. The water level of the spherical tank system is extremely complex to control, because of variation presents in the cross sectional area. For many years, the Proportional Integral (PI) controller is mostly used in process industries, due to their simplicity and flexibility. Hence the PI controller tuning parameters are very significant to control the water level of the spherical tank system. The real time implementations of spherical tank system with PI controller parameter tuning methods by means of tuned by fuzzy logic, Root Locus Technique and Z-N tuning method are used and also analyze the servo and regulatory responses for different set points.

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