Here are three possible actions you can take to bring the plant back to normal operating parameters, based on the information provided:
1. Isolate and Bypass the Freshwater Cooler:
- Looking at the diagram, locate the freshwater cooler (FC) component. This heat exchanger uses seawater to cool the jacket water.
- If the seawater flow or temperature is suspected to be abnormal, isolate the FC by closing valves V21 and V22 at the inlet and outlet, respectively.
- Simultaneously, bypass the FC by opening valves V19 and V20 to create a direct path for the jacket water to circulate back to the engine without going through the cooler.
- Monitor the jacket water temperature. If it starts to decrease, this indicates a problem with the FC, and further investigation or repairs may be needed.
2. Increase Jacket Water Circulation:
- Identify the jacket water pump (JWP) on the diagram.
- If the JWP flow is insufficient, consider increasing its speed if possible. This might be achievable manually or through an onboard control system.
- Alternatively, check if there’s a bypass valve (V18) around the JWP. If so, partially closing it can force more water to flow through the pump, increasing circulation.
- Monitor the jacket water temperature and pump parameters to ensure safe operation within specified limits.
3. Utilize the Auxiliary Jacket Water Pump (if available):
- If your system has an auxiliary jacket water pump (AJWP), locate it on the diagram.
- Start the AJWP to provide additional cooling capacity to the jacket water circuit. This can be particularly helpful if the primary JWP is overloaded or malfunctioning.
- Ensure proper coordination with other crew members if the AJWP activation involves specific procedures or safety precautions.
Remember, these are just potential actions based on the limited information available. It’s crucial to:
- Consult the vessel’s operation and maintenance manuals for specific instructions and procedures.
- Prioritize safety by monitoring critical parameters like engine RPM, exhaust gas temperature, lube oil temperature, and jacket water pressure.
- Seek guidance from qualified personnel onboard or onshore if the situation is unclear or worsens.