Fuel Factors - Briggs & Stratton 8kVA Generating Set Operator's Manual

Fuel Factors

An important consideration affecting the entire
installation is the type of fuel used by your generating
set. The system was factory tested and adjusted
using either natural gas or liquid propane (LP
vapor). For proper engine function, factors that are
inherent to each of these fuels, your location and the
duration of possible utility interruptions are important
considerations in the following fuel guidelines:
• Use clean, dry fuel, free of moisture or any
particulate material. Using fuels outside the
following recommended values may cause
performance problems.
• In engines set up to run on propane (LP),
commercial grade HD5 propane with a minimum
fuel energy of 2500 BTUs/ft 3 with maximum
propylene content of 5% and butane and heavier
gas content of 2.5% and minimum propane
content of 90%.
Natural gas rating will depend on specific fuel but
typical derates are between 10 to 20% off the LP gas
rating.
WARNING Propane and Natural Gas are
extremely flammable and explosive,
which could cause burns, fire or
explosion resulting in death, serious
injury and/or property damage.
• DO NOT operate the equipment if the emergency
"fuel shut-off" valve is missing or inoperative.
• After the generating set is installed, you should
inspect the fuel system periodically.
• NO leakage is permitted.
• DO NOT operate engine if smell of fuel is present or
other explosive conditions exist.
• DO NOT smoke around the generating set. Wipe
up any oil spills immediately. Ensure that no
combustible materials are left in the generating set
compartment. Keep the area near the generating set
clean and free of debris.
Natural gas or LP engines are certified to operate on
natural or liquid propane gas. The emissions control
system for this engine is EM (Engine Modifications).
Power Decrease at High Altitude or High
Temperature
Air density is less at high altitudes, resulting in less
available engine power. Specifically, engine power
will decrease 3.5% for each 300 meters above sea
level and 1% for each 5.6°C above 25°C. Make sure
you and your installer consider these factors when
determining total generating set load.
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