Operators start heating of cleaning liquids.When concentration oi cleaning liquid is not up to the concentration of cleaning, operator will add thick acid liquids or thick alkali liquids to acid tanks or alkali tanks. During cleaning. CIP liquids are fed through pipes and valves by operators. Operators shall add water into tanks when they are in shortage of water.
Advantages : medium capital investment on equipments and medium requirements on operators. After proper training, operator will be able to operate.
Disadvantages: little automatized . In a long run. investment on humans' labor is high. Control on temperature of cleaning liquid is not precise.