Westerbeke 15.0KW -60Hz EDT Manual del operador descargar pdf (Pagina 32)

100

Exhaust Back-Pressure

The exhaust discharge hose must be

adequate size and

minimal run

prevent excessive exhaust back-pressure.

Exhaust back-pressure should be checked before a gener-

ator

put into service. (Refer

the Illustration.) Excessive

back-pressure will affect the engine's performance and

lhe

generator's power output.

To measure

lor

back-pressure, use a mercury manometer, a

pressure gauge,

a waler column. A boatyard

marine

mechanic should have a manometer or a pressure gauge.

Measure the engine's back-pressure at the exhaust elbow

while the generator is under a

lull load.

Reier to the pressure specifications below.

A water column can be made by taking a clear plastic tube

and taping Oile end

the tube along a yardstick and fitting

the other end

the tube with a 1/4 inch NPT (National Pipe

Tap) pipe litting.

Measure the engine's back-pressure at the exhaust elbow

'-"

while the generator is under a lull load.

Dimension A cannot exceed 39 inches

water.

Back pressure, as measured by a gauge instrument, should

not exceed the following specifications:

3 inches

mercury (0.104 kgicm

)

39 inches

waler in a water column

(.099 kglcm

at 4

22 ounces psi

1 1/2 psi

Mercury

Manometer

./ Exhaust

Excessive back-pressure can be caused

a small diameter exhaust hose, a small muffler, sharp bends in

lhe

exhaust hose, improper fittings, water pockets, and a high volume

water in the exhaust system due

the length

the exhaust discharge hose. The use

elbows and fittings in the exhaust discharge hose's

routing should be

limited since these will create flow restrictions and contribute

exhaust back-pressure.

The generator's exhaust system must be separate

from any other engine's exhaust system. Dry portions of

the exhaust system between the engine's exhaust manifold and the water injected exhaust elbow must be

insulated

hold in the

heat

Weslerbeke Generlltonl

211

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