Machinery Cooling Water System Locations and Operations

Machinery Cooling Water System

Locations and Operations

The Machinery Cooling Water System is actually quite simple, so we can point out the general locations of components and explain operations simultaneously.All components are in the Engine Room and VSP Room, and once the system is set up for daily operation, it should require little operator interaction.


Machinery Cooling Water SystemDesign Drawing

A good place to start in understanding the configuration and operation of this system is the Design Drawing.The system is actually laid out in the fireboat very closely to this line drawing.

PORT Machinery Cooling Water Seachest, Seachest Valve, Basket Strainer, Seachest Manifold Isolation Valve

STBD Machinery Cooling Water Seachest, Seachest Valve, Basket Strainer, Seachest Manifold Isolation Valve

The system is designed to run with both port and starboard seachests open. Should one of seachest become fouled with debris, no need to shut down! The opposite seachest can still provide enough water to supply all machinery while the fouled seachest is being cleared, and the strainer basket serviced.


Machinery Cooling Water SystemServicing the Machinery Cooling System Basket Strainer

Leave opposite seachest valve, and manifold isolation valve open.

On the strainer to be serviced:1. Close Seachest Valve2. Close Manifold Isolation

Valve3. Open Strainer Lid4. Clean Stainer5. Replace Strainer6. Secure lid (don’t use

hammer!)7. Open Manifold Isolation

Valve8. Open Sea Chest Valve9. Check for leaks around lid.


Port and Starboard Machinery Cooling Water Seachest Vents

Easy to locate. Straight up from their respective seachests, through the maindeck and outboard near the bulwarks

Machinery Cooling Water SystemPort and Starboard Machinery Cooling Water Seachest Vents

Normally Open

Normally Open

Blow-Down Connection

Port Stbd

Machinery Cooling Water SystemSeachest Blow-Down Procedure

1. Attached a regular air hose to the Seachest Blow-Down air chuck that is mounted just aft of Pump Engine #1. (A 50 foot air hose should reach.)

Note: This is the only fitting “designated” for blow down. It is regulated to 15 psi.

Confirm both air supply valves for the Seachest Blow-Down fitting are open. These valves are just forward of the location of the air chuck you just attached the hose to.

(We can leave these valves Normally Open)

Seachest Blow-Down Procedure


2. Close the Seachest Vent ball valve.

3. Connect the air hose to the air chuck between the vent ball valve and seachest globe check valve.

4. Leave seachest globe check valve open

5. Open ball valve at air chuck to begin blow down of sea chest.

Seachest Blow-Down Procedure


Machinery Cooling Water SystemSeawater Cooling Circuits

Seawater enters through either the port or starboard seachest, passes through the basket strainer to capture debris, and is available to the individual machinery branch lines via the 10 inch athwartships cooling water manifold.

This manifold is pictured here and it is at the forward Engine Room bulkhead.


Individual machinery cooling water branch lines tap into the 10 inch manifold at various locations along the manifold’s length. Each branch line will have an isolation valve in close proximity to the manifold.Most of these valves are under the E/R floor plates.

These valves are Normally Open


Although these valves are normally open, we still need to identify their locations so we can always verify proper orientation, operation, and maintenance.

The following pieces of machinery are connected to this manifold with individual isolation valves:1. Port Main Engine2. Starboard Main Engine3. Port Generator4. Starboard Generator5. Pump Engine #16. Pump Engine #27. Pump Engine #38. Auxiliary Seawater Cooling Pump #1 (Sea

water cooling for Port VSP and Lufkin Gear Boxes

9. Auxiliary Seawater Cooling Pump #2 (Sea water cooling for Starboard VSP and Lufkin Gear Boxes.

10. A/C Cooling Pump #1 (A/C heat exchange)11. A/C Cooling Pump #2 (A/C heat exchange)


Engines

Sea water leaves the manifold, travels through the branch lines and into the raw water pumps for each engine.

Flexible connection

CAT 3512 Raw water pump

Seawater Cooling CircuitsEngines


The sea water circulates through the heat exchanger on each engine, exits, and then heads out the overboard discharge.

CAT 3512 Heat Exchanger

Flexible Connection

Seawater Cooling Discharge Piping


Engines

Leaving the engine, the seawater heads on out the overboard.

Each engine has its own independent overboard discharge globe check valve.

These valves are Normally Open.


Engines

Here is what the seawater cooling overboard discharge looks like for the Starboard Generator.

Normally Open


Engines

This is Pump Engine #3 (CAT C-12 hand line pump engine)Sea water cooling overboard discharge.

Normally Open

All machinery cooling overboard discharge valves areNormally Open


Auxiliary Sea Water Cooling Pumps

The Auxiliary Sea Water Cooling Pumps provide seawater cooling for the Port and Starboard VSP oil coolers, and Lufkin Gear Boxes.

Two (2) 460 VAC, 60 hz, 3 phase motors driving centrifugal pumps rated at 90 GPM @ 45 psi.

Port Pump #1 provides seawater cooling for Port VSP, and Port Lufkin Gearbox, and Starboard Pump #2 provides seawater cooling for Starboard VSP and Starboard Lufkin.


Auxiliary Sea Water PumpNormal Configuration

All valves in these circuits are normally open and the pumps are normally configured to start automatically when you start a Main Propulsion Engine. The Port M.E. will start the Port Auxiliary Cooling Water Pump (Pump #1), and the Starboard M.E. will start the Starboard Auxiliary Cooling Water Pump (Pump #2).

Seawater Cooling CircuitsAuxiliary Sea Water Cooling Pumps




1. Verify Open suction valves for both Port and Starboard Auxiliary Cooling Pumps.




2. Verify Port and Starboard Auxiliary Sea Water Cooling Pump discharge valves are open




3. Ensure sea water cooling inlet valve at both Port and Starboard VSP Oil Cooler are open.




4. Ensure sea water cooling inlet valve for both port and starboard Lufkin gear boxes are open.




5. Ensure port and starboard Auxiliary Sea Water Pump Overboard Discharge valves are open.




Configure selector switches on Motor Controller Console (MCC) on Main Switchboard to “A” (Automatic Run)

Port Propulsion Seawater Cooling Pump #1

Starboard Propulsion Seawater Cooling Pump #2



Auxiliary Sea Water PumpHand Starting

Should either Auxiliary Sea Water Cooling Pump fail to start automatically when you start its respective main engine, you can: • Switch the selector

switch to “H” (For hand operation)

• Then push in the motor controller start button.

The pump motor should start. If it does not, you’ve got other issues…



Auxiliary Sea Water PumpHand Starting

…If that didn’t work, the breaker behind the MCC may need to be re-set.

If the pump still will not run, it is OOS.

But this will not put the fireboat OOS.

We can still configure the VSP and Lufkin Gear Boxes to receive seawater cooling from the Port and Starboard Main Engine Raw Water Discharges.

We will use the Starboard side propulsion system as an example in the following slides:



Auxiliary Sea Water Emergency Supply Configuration

(Using Starboard Auxiliary Sea Water Cooling Pump Failure as example)

1. Open Seawater Cooling Emergency Supply Globe Check Valve.

This branches off the Starboard M.E. raw water overboard discharge line.

2. Close the Starboard Auxiliary Cooling Water Pump Discharge Valve









3. Close Starboard M.E. Sea Water Overboard Discharge





That’s it!

The Starboard M.E. Raw Water pump will now circulate seawater through the VSP oil cooler and Lufkin Gear Box cooling water circuits and out the Auxiliary Sea Water Cooling Overboard Discharge.

You can run in this configuration until you trouble-shoot the Auxiliary Sea Water Cooling Pump issue or replace the pump motor.


A/C Sea Water Cooling Pumps

The HVAC Condensing Units exchange heat with circulating seawater, which then continues overboard.

We will discuss the HVAC Condensing Units in more detail when we cover that system.

The A/C seawater cooling pumps will be described here since they pull seawater from the 10 inch Machinery Cooling Water Manifold.

Seawater Cooling CircuitsA/C Sea Water Cooling Pumps


A/C Sea Water Cooling Pumps #1 and #2 pull water from a common suction, which is connected to the 10 in cooling water manifold with a single butterfly valve.

Normally Open



To service the strainer:1. Open Bi-Pass Valve2. Close strainer Isolation Valves3. Pull Strainer and service4. Reverse order to place back into normal operation

Seawater comes up and through a basket strainer.

Two basket strainer isolation valves (Normally Open), and a strainer bi-pass valve (Normally closed), allow the basket strainer to be service while the pumps are running.



Each A/C Seawater Cooling Pump has its own suction and discharge valves.

Discharge ValvesNormally Open

Suction ValvesNormally Open



Seawater leaves the pumps and goes through the forward E/R bulkhead into the VSP Room.



In the VSP Room the A/C Sea Water enters each HVAC Condensing Unit through an inlet valve. Normally Open

It circulates through the condensing units, exchanging heat with the tempered water. It then exits through each condensing unit’s Sea Water Outlet Valve. Normally Open



The sea water is then returned aft, under the VSP room floor plates,Through the aft VSP room/forward E/R bulkhead, and then out overboard discharge.

The A/C Sea Water Cooling Overboard Discharge ball check valve is Normally Open



Just like the Auxiliary Seawater Cooling pumps,The A/C Sea Water Cooling pumps are normally configured for automatic operation on the MCC.

Just place the selector switch to “A” for automatic operation. The thermostats will start/stop the pump as heat/cooling demand changes.

They may also be start/stopped manually if the selector switch is in “H” or hand mode.

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Machinery Cooling Water System Locations and Operations