User Manual

G3412 TA GAS ENGINE TECHNICAL DATA

FUEL USAGE GUIDE
DERATE FACTOR/ENGINE TIMING vs METHANE NUMBER
<30 30 35 40 45 50 55 60 65 70 75 80 to 100
0 0/-- 0/-- 0/-- 0/-- 0/-- 0/-- 0/-- 0/-- 1.0/23 1.0/25 1.0/26
ALTITUDE DERATION FACTORS
A 130 1.00 0.96 0.93 0.89 0.86 0.83 0.79 0.76 0.73 0.70 0.68 0.65 0.62
M 120 1.00 0.98 0.94 0.91 0.87 0.84 0.81 0.78 0.75 0.72 0.69 0.66 0.63
B 110 1.00 1.00 0.96 0.92 0.89 0.86 0.82 0.79 0.76 0.73 0.70 0.67 0.64
I 100 1.00 1.00 0.98 0.94 0.91 0.87 0.84 0.80 0.77 0.74 0.71 0.68 0.66
E 90 1.00 1.00 1.00 0.96 0.92 0.89 0.85 0.82 0.79 0.76 0.73 0.70 0.67
N 80 1.00 1.00 1.00 0.98 0.94 0.90 0.87 0.83 0.80 0.77 0.74 0.71 0.68
T 70 1.00 1.00 1.00 0.99 0.96 0.92 0.88 0.85 0.82 0.78 0.75 0.72 0.69
60 1.00 1.00 1.00 1.00 0.97 0.94 0.90 0.87 0.83 0.80 0.77 0.74 0.71
(°F) 50 1.00 1.00 1.00 1.00 0.99 0.96 0.92 0.88 0.85 0.82 0.78 0.75 0.72
0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000
ALTITUDE (FEET ABOVE SEA LEVEL)
AFTERCOOLER HEAT REJECTION FACTORS
A 130 2.17 2.37 2.58 2.68 2.68 2.68 2.68 2.68 2.68 2.68 2.68 2.68 2.68
M 120 1.93 2.13 2.33 2.43 2.43 2.43 2.43 2.43 2.43 2.43 2.43 2.43 2.43
B 110 1.69 1.89 2.09 2.19 2.19 2.19 2.19 2.19 2.19 2.19 2.19 2.19 2.19
I 100 1.46 1.65 1.84 1.94 1.94 1.94 1.94 1.94 1.94 1.94 1.94 1.94 1.94
E 90 1.22 1.41 1.60 1.69 1.69 1.69 1.69 1.69 1.69 1.69 1.69 1.69 1.69
N 80 1.00 1.16 1.35 1.45 1.45 1.45 1.45 1.45 1.45 1.45 1.45 1.45 1.45
T 70 1.00 1.00 1.11 1.20 1.20 1.20 1.20 1.20 1.20 1.20 1.20 1.20 1.20
60 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00
(°F) 50 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00
0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000
ALTITUDE (FEET ABOVE SEA LEVEL)
FUEL USAGE GUIDE:
This table shows the derate factor required for a given fuel and what engine timing to use. Note that deration occurs as the methane number
decreases. Methane number is a scale to measure ignition and burning characteristics of various fuels. Representative values are shown below.
Methane 100.00
Ethane 44.00 Most dry pipeline natural gas has a methane number of 67 or above. The gas quality should be analyzed to
Propane 34.00 determine the percentage of each constituent and then determine the methane number. Consult the dealer or
n-Butane 10.00 factory for assistance.
Hydrogen 0.00
ALTITUDE DERATION FACTORS:
This table shows the deration required for various ambient temperatures and altitudes. Use this information to help determine actual engine
power for your site.
ACTUAL ENGINE RATING:
It is important to note that the Altitude/Temperature deration and the Fuel Usage Guide deration are not cumulative, i.e., they are not to be added
together. The same is true for the Low Energy Fuel deration (reference the Caterpillar Methane Number Program) and the Fuel Usage Guide
deration. However, the Altitude/Temperature deration and Low Energy Fuel deration are cumulative; and they must be added together in the
method shown below. To determine the actual power available, take the lowest rating between 1) and 2).
1) (Altitude/Temperature Deration) + (Low Energy Fuel Deration)
2) Fuel Usage Guide Deration
Note: For NA's always add the Low Energy Fuel deration to the Altitude/Temperature deration. For TA engines only add the Low Energy Fuel
deration to the Altitude/Temperature deration whenever the Altitude/Temperature deration is less than 1.0 (100%). This will give the actual rating
for the engine at the conditions specified.