Question 36Refrigeration & AC - Assistant Engineer

The correct answer is A) dirt and foreign particles from coming in contact with the highly polished sealing surfaces. When installing a mechanical shaft seal on a refrigeration compressor, extreme care must be taken to prevent dirt and foreign particles from coming into contact with the highly polished sealing surfaces. This is because the sealing surfaces must remain perfectly clean and undamaged for the seal to function properly and prevent leaks. Contaminants on the sealing surfaces can cause premature wear and failure of the seal. The other options are incorrect because they do not address the primary concern of maintaining the cleanliness of the sealing surfaces during installation. Lubricant contamination (options B and C) and spring damage (option D) are secondary concerns that are less critical than preventing particulate contamination.