We are having a lot of trouble with a pair of pumps used to transfer liquid CO2. The pumps are vertical in-line pumps that use a special type of gas seal designed for cryogenic service. The wear parts (bushing and wear rings) have been converted to a non-metalic material that is more tolerant of dry run. I am wondering what other pump or seal technology is being used successfully in similary services. Specifically, what other pump configurations are working well for others? Is anyone using seal-less pumps in services such as this? Any suggestions will be greatly appreciated.
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