TP-5982 4/0616 Section 3 Cooling System
Do not align the strainer (in relation to the direction of
travel) with any other through-hull intakes. See
Figure 3-3. Flush mount the recommended
through-hull strainer. Install slotted-hole design
strainers with the slots parallel to the direction of the
vessel’s movement.
Note: Position the intakes in relation to the vessel’s
travel so neither is in the wake of the other.
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2
4 3
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1. Generator set intake
2. Intake
3. Aft (rearward)
4. Fore (forward)
Figure 3-3 Intake Strainer Installation
Do not use a speed scoop or cup design intake
through-hull strainer because it can cause a ramming
effect and force water upward, past the seawater pump,
and into the engine cylinders when the vessel is moving
and the generator set is shut down.
Do not use hull designs incorporating sea chests or
other designs that provide a positive pressure to the raw
water pump for the intake through-hull strainers. A
positive pressure will force water past the raw water
pump and into the engine. A sea chest is a concave
molded-in-the-hull chamber that aligns to the direction
of travel. A sea chest configuration applies a positive
pressure similar to a scoop-type through-hull strainer.
3.2.2 Seacock
Mount the seacock to the hull, assemble it to the intake,
and ensure that it is accessible for operation. Figure 3-2
shows a typical seacock installation.
Avoid overcaulking the seacock. Excess caulk reduces
water flow and, in some cases, develops a barrier that
can force water upward, past the seawater pump, and
into the engine cylinders when the vessel is moving and
the generator set is shut down.
3.2.3 Seawater Strainer
Mount the seawater strainer to the seacock or
permanent structure at a point not higher than the
seawater pump. Ensure that the strainer is accessible
for service. See Figure 3-4 for a typical installation.
Note: Some seawater strainers include a seacock and
an intake through-hull strainer.
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1. Seawater pump
2. Seawater strainer
3. Seacock
Figure 3-4 Seawater Strainer Installation
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