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What precautions should I take when shutting down units containing fluids with a much lower boiling temperature than ambient temperature?
Units containing fluids that have a much lower boiling temperature than ambient temperature (e.g. Freon, ammonia) must not reach ambient temperature with the valves closed. The piping must be designed so that continuous purging is possible.
See the user manual alfa-laval-spiral-instruction-manual-en.pdf for more details.