Beta Marine BetaGen 10, Installation Manual, Page: 39 / 116

37
21 Sea Water Inlet - Scoop
2. Good access to the inlet sea cock from inside your
boat is essential so that debris or seaweed trapped in
the intake can be removed.
3. All pipe work should have approved marine grade
stainless steel hose clips. Any loose clamps or bad
connections can cause flooding and sinking of the
vessel. It is accepted practice that two stainless steel
clips should be used at each end of raw water pipes
for security. Ensure that you use the correct grade of
hose.
NB:
• The maximum lift of the sea water pump is 2m when
primed.
• The water intake hose must be a reinforced type so
that it does not collapse under suction.
4. A normal inlet sea cock type ‘A’ is recommended as
this can be ‘rodded out’ to remove blockages, please
refer to image 20.
We do not recommend the use of ‘scoop’ type water
pickups, because if fitted the wrong way around the
water will be forced through the pump and into the
exhaust system whilst the vessel is sailing. This is very
dangerous as the exhaust will eventually fill and sea/
raw water will back up into the engine through the
exhaust valve. Catastrophic failure will result as soon
as the engine is restarted. Please refer to image 21.
EXHAUST HOSE
{
Wet exhaust hose should be matched to the injection
bend diameter. An engine correctly installed in accordance
with this handbook will meet the emission requirements
of the RCD (Recreational Craft Directive).
BetaSet-BetaGen Hose I.D
4/2, 6/2, 11/2, 22/2, 25/2,
7, 10, 12, 14 & 21
50 mm
26, 33, 40 & 49 60 mm
40T IIIA & 49T IIIA 90 mm
EXHAUST BACK PRESSURE
{
Exhaust back pressure should be as low as possible; it is
increased by long exhaust length and sharp bends. Keep
exhaust systems to a minimum length and have gradual
bends avoid tight angled elbows. Back pressure should be
measured with the complete exhaust system connected
and the generating set running at service speed. The
correct measuring point is before the injection bend (at
the manifold flange).
BetaSet-BetaGen Exhaust Back Pressure
4/2, 6/2 & 11/2 Max. 70 mm Hg
7, 10, 12, 14,
21, 22/2 & 25/2
Max. 80 mm Hg
26, 33, 40 & 49 Max. 90 mm Hg
40T IIIA & 49T IIIA 85 to 115 mm Hg