Chapter 4 MAINTENANCE
4-3
Table 4-2 Fuel Use Limit Property Guideline
Property Recommend use limit Current use limit Remarks
Flash point As stipulated by regulation
JIS K2204, 2205
Diesel fuel: 50
°C or higher
Class-A heavy oil: 60 °C [140
°F] or higher
Distillation
First distillation
point
170 °C [338 °F] or higher
170 °C [338 °F] or
higher
JIS K2254
90% distillation
point
330 to 380 °C
[626 to 716 °F]
330 to 380 °C
[626 to 716 °F]
Pour point
More than 6°C [10.8 °F] below ambient tempera-
ture
JIS K2269
Cloud point Below ambient temperature
Carbon residue (10% residual
oil)
0.4 weight % or lower 1.0 weight % or lower JIS K2270
Cetane number 45 or higher
Cetane index (new) 45 or higher JIS K2280-1996
Kinetic viscosity
2.0 mm
2
/s [0.0031 in
2
] or higher (30 °C [86 °F])
8.0 mm
2
/s [0.0124 in
2
] or lower (50 °C [122 °F])
10.5 mm
2
/s [0.0163 in
2
] or lower (40 °C [104 °F])
16.0 mm
2
/s [0.0248 in
2
] or lower (30 °C [86 °F])
Sulfur content 0.2 weight % or lower 1.0 weight % or lower
JISK25410.05 weight %
(same as diesel fuel) is rec-
ommended.
Water and sediment 0.1 volume % or lower JIS K2275
Ash 0.03 weight % or lower JIS K2272
Copper plate corrosion
(100
°C [212°F], 3 hrs.)
No.3 or lower No.3 or lower
ASTM - No.3
JIS K2513 - Discoloration
No.3
Specific gravity (15°C [59°F]) 0.83 to 0.87 0.80 to 0.87
Coking test
Should not be carbonized
more than 75% at 250 °C
[482 °F]
Should not be carbon-
ized 100% at 250 °C
[482 °F]
Fed791B (U.S.)
250 °C [482 °F] X 24Hr
230 °C [446 °F] X 24Hr
180 °C [356 °F] X 48Hr
Should not be evapo-
rated more than 55% at
230 °C [446 °F]
Should not be turn to tar
at 180 °C [356 °F]
Aromatics content
(HPLC method)
38 weight % or lower 38 weight % or lower
JIS K 2536
Total of aromatic content
Asphaltene 0.1 weight % or lower 0.1 weight % or lower ICP analysis (U.K.)
Particulate contaminant 5.0 mg/l or lower 5.0 mg/l or lower
JIS B9931
Including foreign substance in
the fuel pipe lines
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