Fresh Water Cooling Systems Sample Clauses

Fresh Water Cooling Systems. Each propulsion and SSDG shall be fitted with an independent, closed circuit, fresh water cooling system, generally as shown on Reference (2D). Engine cooling fresh water shall be circulated by engine mounted and driven pumps furnished with the engines. Each propulsion engine jacket water and aftercooler cooling circuit shall be fitted with a combination heat exchanger, refer to Section 256.3. 765 770 775 780 785 790 795 A tempered water heat exchanger shall be fitted to each main engine jacket water circuit in parallel with the combination propulsion heat exchangers on each main engine. The flow balance between the propulsion heat exchanger and the tempered water heat exchanger in each circuit shall be controlled by three-way temperature control valve. Each three-way control valve shall be equipped with an electric valve operator, remote temperature sensor, and a suitable PLC based PID controller. The valve operator shall be supplied with adjustable limit switches, a manual override operator, and shall meet all applicable ABS and USCG requirements. The controller shall be programmed to maintain a constant return jacket water temperature to the engine, by varying amount of flow directed to the tempered water heat exchanger. When the jacket water temperature exceeds the controller set point, more jacket water shall be directed to the propulsion heat exchanger; conversely, when the return temperature is lower more jacket water will be directed to the tempered water cooler. The valve limits shall be adjusted to prevent excessive jacket water flow through the tempered water heat exchanger. The SSDGs shall be provided with engine mounted fresh water cooling circuits and heat exchanger. The Contractor shall provide and install engine coolant expansion tanks in accordance with the manufacturer's requirements. Propulsion expansion tanks shall generally be sized to 18-25% of the total volume of the cooling loop. Engine cooling water expansion tanks shall be located above the highest point in the cooling water system and equipped with a 1 inch fill complete with pressure cap, 1 inch drain, low-level alarm, and sight glass. Low-level switches shall initiate alarm when the amount of water in the tank decreases to 5 gallons. Pressure cap shall be set to operate at 7 psig. Provide and install flexible connections at each engine as recommended by the engine manufacturer. Provide and install 1/2" valved test cocks in each engine cooling circuit for drawing coolant samples...
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