For chilled water, hexanediol at -15℃ is used – should control measures be implemented, and is it necessary to install a safety valve?
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For chilled water, hexylene glycol at -15°C is used. 1. Should the usage amount of chilled water be controlled? 2. Is it necessary to install a safety valve on the chilled water return pipe? 3. In case of an emergency shutdown, is it appropriate for the chilled water to continue flowing? 4. In the event of a fire, it is necessary to turn off the hot medium and turn on the cold medium; does this mean that, from a process design perspective, the cold medium can remain on continuously?
Answering question 1: Should the consumption of chilled water be under control? This depends on the purpose for which it is used. If it is used for cooling in case of accidents, there is no need to control the chilled water flow; but if it is used to regulate temperature during production, then control is necessary. 2. Whether a safety valve is needed on the chilled water return pipeline: This mainly depends on the temperature of your heat source; if it exceeds the designed pressure, then a safety valve is necessary. 3. In the event of an emergency shutdown, is it appropriate to keep the chilled water flowing? This depends on whether it is required by the process. 4. In the event of a fire, it is necessary to turn off the hot medium and turn on the cold medium; does this mean that, from a process design perspective, the cold medium can remain on continuously? No, usually either the refrigerant is turned on or it isn’t; they’re not turned on at the same time.