Armstrong Engineering Associates, Inc.
A scraped surface heat exchanger is a double pipe element used in both continuous cooling crystallization and viscous cooling. Heat transfer occurs across the scraped wall of the inner pipe as coolant flows in the annulus between the outer pipe and the inner pipe containing the process fluid. The inner pipe ranges from 6” NPS to 12” NPS and the outer pipe may be as big as 16” NPS. A typical commercial installation consists of multiple double pipe elements connected in series, with each element 20 to 50 ft long.