Westerbeke 21A Manual de Instalação descarregar pdf (Página 21)

Check Valves

Various types of check valves are available and suitable for

exhaust runs. Examples are in-line check valves offered by

some exhaust component manufacturers and flapper valves

on exhaust outlets. None of these may be considered as an

alternative to a good installation. They can leak, they can

foul, and they can open intermittently. Think of them as an

emergency means to keep out that rogue wave or extreme

following sea. Never rely on them to stay closed for more

than a second or two. Read again “CUMULATIVE

PROCESS” on the previous page.

Water Separators Exhaust Systems

Water separators are the latest innovation in exhaust systems.

The separator uses gravity and centrifugal force to separate

the cooling water from the exhaust gas and then discharges

then separately under the vessels hull. This makes for a quiet

and efficient system that reduces back pressure and prevents

sea water intrusion by wave action.

Installation

The separator must be securely mounted as high as possible

(point A in the previous diagrams) above the water lift

muffler and well above the vessels waterline in all attitudes

of operation.

The discharge (drain) hose for the separated cooling water

must go directly and vertically down from the separator to a

thru hull fitting on the hull below the waterline. This

provides a very quiet exhaust.

The discharge (drain) hose for the exhaust gas must also go

directly and vertically down to a thru hull fitting under the

hull just above the waterline. This gas discharge hose will

still contain some water, to prevent this water from becoming

trapped and impeding the flow of gases, make certain the

hose leads down hill without any loops or dips.

Water separators are manufactured by:

Halyard Limited Centek Industries, Inc.

Whadden Business Park 116 Plantation Oak Drive

Southhampton Road P.O. Box 3028

Whadden, Salisbury SP5-3HF Thomasville, GA 31799-3028

United Kingdom

WWW.centekindustries.com

WWW

.halyard.eu.com

Dry Stack Exhaust Systems

Commonly seen on commercial fishing boats, dry stack

exhausts can also be used on trawler style pleasure boats. A

dry stack exhaust directs the exhaust gas straight from the

generator or engine without obstructions. A dry stack exhaust

becomes very hot when the engine is operating and should

not be close to any combustible materials (wood, fiberglass,

etc.) unless it is properly shielded or insulated.

Make certain the exhaust and muffler are of sufficient

diameter to clear the exhaust gasses and prevent excessive

back pressure. Provisions must also be made for discharging

the raw cooling water.

After final assembly, test run the generator and check all

connections and elbows for exhaust leaks. A back-pressure

test should also be performed at this time. Back pressure

should not exceed 1.5 psi (0.11 kg/cm

Regulations require that the exhaust muffler be constructed

of aluminized steel or other corrosion resistant material and

be of welded or crimped construction. An approved spark

arrestor must be installed with the muffler in gasoline

installations.

NOTE: Liability for damage or injury and warranty expenses

becomes the responsibility of the person installing an exhaust

system. Contact WESTERBEKE or your WESTERBEKE

dealer regarding any exhaust system problems.

Exhaust Back Pressure

After the installation is operational, exhaust back pressure

must be measured at the outlet of the water injected exhaust

elbow. Measure with an appropriate gauge or manometer.

Operate a propulsion engine underway at cruising RPM.

Operate a generator at rated load. As the engine/genset

operates it continuously pushes the exhaust gases and raw

water thru the exhaust system, up hill and overboard thru the

exhaust outlet. This causes significant back pressure.

Excessive back pressure reduces engine power, higher

temperatures and cab reduce the life of the engine.

EXHAUST SYSTEM INSTALLATION

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