In a jacket-water heated submerged tube evaporator, what is the primary factor that determines the rate of scale build-up on the submerged tube bundle?
• Scale formation in distillation/evaporator plants • Relationship between dissolved solids (salts) and scaling on heating surfaces • Difference between heating medium side (jacket water) and seawater/evaporator side
• Ask yourself: Which fluid actually leaves behind the solid deposits on the tube surfaces when water is evaporated? • Consider whether temperature alone creates scale, or whether it mainly affects how quickly dissolved minerals come out of solution. • Think about which of the listed choices would most directly change the amount of solid material available to form deposits.
• Identify which side of the system (jacket water vs seawater) is responsible for mineral content that forms scale. • Check which option directly affects the amount of dissolved salts reaching the evaporator tubes, not just their temperature. • Verify whether additives in the jacket water are normally designed to reduce scale on the jacket-water side or control deposits on the seawater/evaporator side.
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