4.3 Connecting Seawater to Heat Exchanger

Refer to Figure 31 for typical Seakeeper 9 seawater plumbing arrangement.

1. Connect seawater from installer-supplied pump to lower ¾ in. (19 mm) hose barb on heat exchanger. (See Figure 1) Use the same practices as other below waterline seawater plumbing. Required flow rate is 4 GPM (16 LPM) minimum and 8 GPM (30.3 LPM) maximum.
2. Connect seawater discharge (upper hose barb) to overboard drain. (See Figure 29) Use the same practices as other below waterline seawater plumbing.
3. In addition to initial operation at dock, new installations should be checked for minimum 4 GPM (16 LPM) flow while vessel is at speed and when backing down. If no other method of confirming flow is available, discharge line may be temporarily diverted to a bucket. Flow is calculated from time to fill a known volume. A self-priming seawater pump (customer/installer supplied) may be required due to installation location to maintain water flow in all underway conditions where cavitation near the intake may occur and potentially cause an air-lock condition restricting seawater flow to the heat exchanger.
4. Inspect raw water plumbing after sea trial for any signs of leakage.
5. Heat exchanger contains removable endcaps to provide access for cleaning the tube bundle.

Seakeeper Optional DC Seawater Pump (P/N 30331)

1. Seakeeper offers a self-priming DC Seawater pump operated at 24 VDC for the Seakeeper 9 (Figure 32).
2. The pump assembly is pre-wired for connection to Seakeeper 9 Seawater Pump Output Cable, “SW Pump Output” and includes a seawater strainer and various fittings. The pump specifications are as follows:

Volts	24 VDC
Rated Flow	5.5 GPM (nominal)
Overcurrent Protection Rating	15 A
Ignition Protection	ISO 8846 or equivalent

NOTE: Only use SeaFlo-provided threaded fittings with DC Seawater Pump 30331.