Hello,

I would like to wish everyone in this group a happy new year.

We've encountered a challenge in one of our recent ammonia pumped refrigeration projects, where the pump keeps tripping. The system in question has a blast freezer only and operates smoothly for the first 6 hours of the total 8-hour cooling cycle, but after that, the pump starts tripping. One theory that emerged during our brainstorming session points to bubbles as the potential culprit and the argument goes as follows.

Towards the end of the cooling cycle, with minimal load on the blast freezer, more liquid returns to the separator, creating a splashing effect. These bubbles formed during the process might be carried to the pumps, causing the tripping issue.

Has anyone else faced similar issues, and if you don't mind, could you share your experiences?