Desalination Plant form equipment to used for water purifier, This research work is to study the process of water purifying and analyze performance of the desalination plant of PLTGU Semarang with compare with the factory design. Normally, this desalination plant\u27s main function is to supply raw water and service water, that used to power plant activities.
Data removal operating parameters influential toward unit performance analysis important activity. Data processing talked about give image and reference about the two of them unit desalination plant performance with the factory design until difference of performance ascertainable and variance parameters to influence as form creative problem solving.
From this study, it was found that the desalination plant performance at unit 2 is 67,17% and unit 3 is 58,29% in PLGU Semarang, lower than standart at factory design. Difference of performance is caused by some factor. It is recommended continous maintenance to vital equipments is a solution to increase the system performs.
Keywords : Desalination Plant, Parameters, Performance