4.3 Connecting Seawater to Heat Exchanger

Refer to Figure 25 for typical seawater plumbing arrangement.

1. Connect seawater pump to Seakeeper dedicated through-hull fitting. A strainer and seacock valve should generally be installed between the seawater inlet and the pump.
2. Connect seawater from installer supplied pump to lower 3/4 in. (19 mm) hose barb on heat exchanger. Use the same practices as other below waterline seawater plumbing.
3. Connect seawater discharge to overboard drain. Use the same practices as other below waterline seawater plumbing.
4. Required flow rate is 2 GPM (7.6 LPM) minimum and 6 GPM (22.7 LPM) maximum.
5. In addition to initial operation at dock, new Seakeeper installations should be checked for minimum 2 GPM (7.6 LPM) flow while vessel is at speed and when backing down.
   
   1. 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.
   2. Flowrates in excess of 6 GPM (22.7 LPM) could affect heat exchanger life.
6. Inspect raw water plumbing after sea trial for any signs of leakage.