Westerbeke 21A Instrukcja Instalacji Pobierz pdf (Strona 32)

DUAL PURPOSE FUEL TANK

If you’re running both a generator and a propulsion engine

and they use the same fuel, you can use the same fuel tank.

However, before that decision is made, the following factors

must be considered:

4 There must be adequate fuel capacity for both

engines — refer to the specifications section of

your owner’s manual for fuel consumption figures.

4 In diesel installations the fuel returning to the tank is

warm. To obtain maximum engine efficiency, fuel

delivered to the injectors must be cooled. The fuel

tank volume must be adequate to cool the returned

fuel.

If a fuel tank is shared, a fuel line tee should not be used. A

tee can cause erratic genset operation due to fuel starvation.

The genset’s fuel pump does not have the capacity to

overcome the draw of the propulsion engine’s fuel pump.

This is true also of the return lines. Pressure from one engine

could be higher than the other and force return fuel back into

the lower-pressure engine injector. The return line should

enter the tank as far as possible from the supply lines.

FUEL LINES

The proper installation of fuel lines is very important. All

fuel line materials must be approved for marine installations

and meet the requirements of both the USCG and the ABYC.

The fuel system should be installed in such a manner as to

allow the engine-mounted fuel lift pump to maintain a

positive inlet pressure to the injection pump under all

operating conditions. As the fuel lift pump has a capacity in

excess of that required by the injection pump, the overflow is

piped to the fuel tank and should be connected at the top of

the tank.

Great care should be taken to ensure that the fuel system is

correctly installed so that airlocks are eliminated and

precautions taken against dirt and water entering the fuel.

NOTE: The fuel supply line to the engine/generator should be

from its own pick-up in the fuel tank and NOT teed off the

supply line to another engine/generator.

Keep the fuel lines as far as possible from the exhaust pipe

and hot engine areas; this is to keep the fuel at a minimum

temperature to reduce the chance of vapor lock in gasoline

installations.

Run fuel lines at the top level of the fuel tank to a point as

close to the engine or generator as possible to reduce the

danger of fuel siphoning out of the tank if the line should

break.

Fuel piping should always be routed and securely anchored

to prevent leaks from vibration and chafing. Fuel piping is

usually secured by copper straps every 12-14 in (30-36 cm).

Use as few connections as possible, and install the lines so

they are accessible and protected. Avoid locked-in torsional

stresses.

RIGID FUEL LINES

For installations with rigid fuel lines, Westerbeke recom-

mends using copper tubing with suitable flated fittings, both

for the supply line and the return line. Use seamless annealed

double flared fuel lines that are approved for marine installa-

tions. Run the tubing in the longest pieces obtainable to

avoid the use of unnecessary fittings and connectors. The

minimum size of the fuel supply line and fuel return line is

1/4 inch, inside diameter.

When a copper fuel line is used, electrically bond the fuel

line to the vessel’s common bonding conductor with a

suitable strap or 10 gauge wire.

FLEXIBLE FUEL LINES

If a rigid metallic fuel line is run into the engine/generator

compartment, a length of flexible hose must be installed to

absorb vibration from the engine/generator. Install a

non-organic flexible hose without metal reinforcement

between the rigid fuel line and the engine/generator to absorb

the vibration. This line must be long enough to prevent

binding or stretching because of engine/generator movement.

A flexible fuel line may also be installed between the fuel

yank and the engine/generator for both the supply line and

the return line. For the supply line, flexible hose may be

installed from the fuel tank outlet to the fuel filter/water

separator, and from the fuel filter/water separator to the

engine-mounted fuel pump inlet.

Use suitable end fittings, and install all the hose in the

longest runs possible to avoid the use of unnecessary fittings

and connectors. There must not be an electrical connection

between the hose end fittings as a bad ground in the cranking

circuit will cause a wire-reinforced hose to become charged

and ignite the fuel during cranking.

FUEL SYSTEM

▲ WARNING:

Ignition of fuel can cause fire and

severe personal injury or death. Be sure any flexible fuel

line used between the fuel tank and the engine/

generator meets ABYC and USCG requirements.

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