Global Journal of Computer Science and Technology, C: Software & Data Engineering, Volume 22 Issue 2

higher the boiler operating pressure, the greater will be the sensitivity to impurities. The boiler safety, emergency procedures datasets are used because that area is where fault solutions are placed. The datasets are placed in a tabular form as shown below in table 1 and 2. Table1: Boiler Drum Water Recommended Quality Parameters Unit Value Ph Value - 10.8 - 11.4 Alkalinity as CaC0 3 ppm 190 Sodium Phosphate as PO 4 ppm 29 - 34 Total Dissolved solids ppm 143 Silica Si0 2 ppm 4 Oil and Organic matters ppm Nil Table 2. Feed Water Recommendation Quality Parameter Unit Value General appearance Clear and Colourless Total hardness as Caco 3 ppm Commercial zero Total Fe ppm <0.025 Total Cu ppm <0.02 Oil and Organic ppm <0.1 Ph Value At 25 o c ppm 8.5 - 9.5 Total dissolved solid ppm <1.5 Reactive SiO 2 max ppm <0.20 b) System Use Case Diagram Use case diagram give simple overview of an interaction of the proposed system users can have more about what is happening. This detail can either be a simple textual, a structural description in a table or a sequence diagram and it is used to support requirement elicitation. This use case diagram shows the user’s (field operator/engineer’s) interaction with the proposed system, here the user navigates the proposed system and get the expected results/output. Figure 2: Use Case Diagram of the System The use case diagram shows the actors (field operator/engineer) using the system. The user enters values required for the steam package boiler, to keeps the system on control, maintaining the required set points of pH values, feed water and boiler drum water level qualities etc., reduced downtime and boiler damages. When the system panel indicator displays red on either side of panels due to drifting of the steam boiler parameter set points, the user (field operator/engineer) should be able to see it and effect changes. On a MOM, the user makes more corrections during navigating the system, while the system on AOM, restores system errors on either boiler drum or feed water qualities as parameters drifted from their set points which effect system and make changes to keeps the boiler working efficiently. c) System Activity Diagram The activity diagram reveals the events of the user (field operator/Engineer) using the system. The user opens the app, check the system values. if the boiler runs with correct values as design specifications, the system runs smoothly and efficiently, otherwise, the user inputs the required parameter values to control and maintain the steam boiler system. This system using the rule-base system & fuzzy logic technologies was designed to run in two modes, manual operation mode (MOM) and automatic operation mode (AOM). The auto run was selected due to faster and quicker response for equipment operations as instrument air is on FO/FC condition. Steam Package Boiler Expert System for Control and Maintenance of Fertilizer Plants Using Rule-Base Fuzzy Logic Global Journal of Computer Science and Technology Volume XXII Issue II Version I 29 Year 2022 ( ) C © 2022 Global Journals