Lower end cap of the heat extraction tube in the internal heat extractor
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Have you replaced the lower end caps of the heat extraction tubes in the internal heat exchanger? And how is pressure testing carried out after the replacement?
Hasn’t it been replaced by anyone? Is it pressurized together with the medium-pressure water system?
No thickness measurement or other methods were used to check the quality
One just leaked; it was cut out, inspected, and replaced.
How to determine which one is leaking? Was it tested one by one?