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- Q532 - Motor Plants II
186. As a general rule, what would be the recommended operating water jacket outlet temperature range for medium-speed marine diesels setup with closed treated fresh water cooling systems and fitted with vented expansion tanks?
The recommended operating water jacket outlet temperature range for medium-speed marine diesels with closed treated fresh water cooling systems and vented expansion tanks is 165 to 180F. This range balances engine efficiency, corrosion prevention, and avoids boiling, which is critical in vented systems operating near atmospheric pressure.
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