Hyundai DHY18KSEm Operation And Maintenance Manua page 19

The following fuel oil specification is typical. For a
specific engine refer to manufacturers' data sheets
for fuel oil details.
Fuel Recommended Physical Properties Feature
Viscosity
1.3 to 5.8 centistrokes (1.3 to 5.8mm per second) at 40°C (104°F)
(ASTM D445)
Cetane Number
40 Minimum above 0°C (32°F) ~45 Minimum below 0°C (32°F)
(ASTM D613)
Sulphur Content
Not to exceed 0.5 mass percent* (ASTM D129 or 1552)
Active Sulfur Copper Strip Corrosion
Not to exceed No. 2 rating after three hours at 50°C (122°F)
(ASTM D130)
Water and Sediment
Not to exceed .05 volume percent (ASTM D1796)
Carbon Residue
Not to exceed 0.35 mass percent on 10 volume percent
residuum (ASTM D524 or D189)
Density
42 to 30° API gravity at 60°F (0.816 to 0.876 g/cc at 15°C).
(ASTM D287)
Cloud Point
6°C (10°F) below lowest ambient temperature at which the fuel
is expected to operate(ASTM D97)
Ash
Not to exceed 0.02 mass percent (0.05 mass percent with
lubricating oil blending) (ASTM D482)
Distillation
The distillation curve must be smooth and continuous (ASTM
D86)
Acid Number
Not to exceed 0.1 Mg KOH per 100 ML (ASTM D664)
Lubricity
3100 grams or greater scuffing BOCLE test or Wear Scar
Diameter (WSD) less than .45mm at 60°C (WSD less than .38mm
at 25°C) as measured with the HFRR method.
Diesel Fuel Property Definition
Ash ‐ Mineral residue in fuel. High ash content leads
to excessive oxide build up in the cylinder and/ or
injector.
Cetane Number ‐ Ignitability of fuel. The lower the
cetan number, the harder it is to start and run the
engine. Low cetane fuels ignite later and burn slower.
This could lead to explosive detonation by having
excessive fuel in the chamber at the time of ignition.
In cold weather or with prolonged low loads, a higher
cetane number is desirable.
Sulphur ‐ Amount of sulphur residue in the fuel . The
sulphur combines with the moisture formed during
combustion to form sulphuric acid.
Viscosity ‐ Influences the size of the atomized
droplets during injection. Improper viscosity will lead
to detonation, power loss and excessive smoke. Fuels
that meet the requirements of ASTM or 2.0 diesel
fuels are satisfactory with fuel systems.
2.8.2
Fuel tank
Our generator sets provide base frame style fuel tank
for customer. The base frame style fuel tank is
installed with fuel tank, fuel pipes and fuel level
indicator. This fuel supply system does not need
customer to make other installations. Customers only
need to add fuel to the base frame.
Users who intend to self manufacture the fuel tank
shall use stainless steel or steel plate to make the
backup tank, do not make painting or galvanization
inside of the fuel tank so that to avoid the possible
chemical reaction between these kind of materials
and diesel, which may generate the material harmful
to the generator set and decrease the quality, Merit
Rating and combustion efficiency of diesel. In
addition, the configuration of fuel tank assembly shall
be as follows:
◆Air ventilation pipe above fuel tank surface
◆Manhole on the top surface of fuel tank
◆Watch window for fuel level
◆Discharge valve at the bottom of fuel tank
◆Ground cable between fuel adding hole and fuel tank
◆Separate panel with holes between fuel supply area
and fuel return area, so that to reduce heat exchange
◆The end of fuel supply pipe shall be 50mm above the
bottom of base frame so that to avoid the deposit
and water at the bottom of fuel tank being sucked
into fuel supply pipe.
◆Part of the generator sets' fuel level shall be higher
than the position of fuel injector, so that to avoid fuel
return from fuel injector, which cause start difficulty.
2.7.2
Installation of fuel tank
◆ The position of the fuel tank shall ensure the
maximum suction fuel head is no less than 2 meters.
Suction fuel head of the fuel transfer pump shall be
calculated from the bottom of the fuel tank.
◆The position of the fuel tank shall ensure maximum
return fuel head no less than 1.5 meters. Return fuel
head shall be calculated from the top of the base
frame.
◆The arrangement of the fuel pipe shall avoid the fuel
being affected from the heat elimination from
generator set too much.
◆The maximum temperature of the fuel before fuel
pump shall be lower than 60 degree Celsius.
◆No leakage of fuel and air is allowed in the fuel inlet
and fuel return pipe. This is very important.
◆Hose need to be used to connect generator set with
fuel transfer pipe. If the generator set use soft
connection (through vibration reduction unit), hose
shall be used.
◆When engine's fuel inlet pipe is above 6 meters and
9
User manual