Section 3 – Installation and Operation Page 3-7 CFP83 Series Raw Water Supply Installation Overview Raw water is used to cool the engine cooling fluid. Raw water is supplied from the fire pump prior to the pump discharge flange. It is forced through a cooling loop by fire pump pressure to the heat exchanger. In the heat exchanger, it flows through the tubes in the bundle and is discharged to an open waste cone. The raw water supply must be immediately available when the engine is started. Refer to the Cooling System Flow Diagrams in Section 6 for a simplified block diagram of the cooling water system. Refer to Cooling System Specifications in Section 10 for pipe size requirements.
Refer to Drawing 9659 in Section 13 for the optional raw water piping manifold that is available from Cummins Fire Power. If the piping supplied by the customer, provide raw water supply piping and components equivalent to that can be supplied by Cummins Fire Power and as shown in Assembly Diagram, Raw Water Piping in Section 6. Refer to National Fire Protection Association NFPA20-2003 Chapter 11 for installation requirements for installations in the USA. When choosing the components for the raw water supply and by-pass, care must be taken to ensure that the internal cross sectional area of the component is at least as large as the recommended pipe size.
When the raw water piping is installed, adjust both pressure regulator setpoints before operating the pump. Damage to the heat exchanger may occur from improperly regulated raw water supply pressure. Raw Water Supply and Drain without Cummins Raw Water Manifold (CFP83-F10, F20, and F30 Only) NOTE : Raw water outlet piping from the heat exchanger should be one pipe size larger than the supply piping. NOTE : The velocity of raw water should be as great as possible without exceeding the maximum shown on the appropriate engine data sheet. NOTE : Failure to comply will result in engine overheat and failure. Provide raw water supply to the engine side of the heat exchanger.
Provide an open waste cone raw water drain at the outside of the heat exchanger. Drawing No. 9777, Section 3, Rev. 02-07