Kohler Specifications For Fuel Gases; Lower Heat Value; Contaminants Of Fuel Gas - Kohler SFGLD480 Operation & Maintenance Manual

ammonia, and even condensation water that sometimes contributes to increasing the harmful effects of the
contaminants, etc.
Although not explicitly referred to in this document, any gas constituent which has any of the described effects on
the engine components, should be considered as included in the list of harmful contaminants and it will be the
customer's responsibility to follow the engine manufacturer's recommendations specific to each case of
application.

5. KOHLER SPECIFICATIONS FOR FUEL GASES

5.1. LOWER HEAT VALUE

Lower heat values of fuel gases may be within the following ranges:
NATURAL GAS:
DIGESTER GAS:
LANDFILL GAS:
LEAN LANDFILL GAS:
RICH SYNGAS:
LEAN SYNGAS:
LOW METHAN NUMBER GAS:
VERY LOW METHAN NUMBER GAS: 40 / 93 MJ/m
PROPANE:

5.2. CONTAMINANTS OF FUEL GAS

Listed below are the contaminants that are normally found in gases used as fuel in Kohler engines.
Contaminants other than those listed are not allowed in the fuel gas.
The permissible amounts of those contaminants in each type of fuel are stated in the relevant Product Information
sheets. Refer to IC-G-D-30-002e for natural gas, to IC-G-D-30-003e for digester and landfill gas, to IC-G-D-30-
004e for gases from thermochemical processes, IC-G-D-30-013 for low methane number gases and to IC-G-D-
30-018 for propane.
5.2.1. SULFUR COMPOUNDS LIKE H
Among the sulfur compounds present in fuel gases, hydrogen sulfide (H
sulfide is a corrosive compound that is normally contained in gases resulting from the decomposition of organic
matter. There are limitations to its concentration in fuel gases because:
- H S attacks the metal parts of the engine - above all those containing copper - reducing their service life and
2
performance.
H S leads to premature degradation of lubricating oil. Indeed, an acidic constituent, H
-
2
additives, reducing the life of oil, if its concentration is out of the specifications.
- H S generates sulfur oxide releases at the exhaust. Emissions of sulfur oxides are limited by law and also
2
attack the exhaust gas piping, silencers, turbochargers, valves, etc.
PRODUCT INFORMATION
IC-G-D-30-001e
FUEL SPECIFICATIONS FOR GAS ENGINES. GENERAL
3
30 / 43 MJ/m equal to 7165 / 10270 kcal/m
n
3
23 / 30 MJ/m equal to 5490 / 7165 kcal/m
n
3
17 / 23 MJ/m equal to 4060 / 5490 kcal/m
n
3
14 / 17 MJ/m equal to 3350 / 4060 kcal/m
n
3
7.0 / 14 MJ/m equal to 1670 / 3350 kcal/m
n
3
4.6 / 7.0 MJ/m equal to 1100 / 1670 kcal/m
n
3
40 / 47 MJ/m equal to 9560 / 11230 kcal/m
n
3
equal to 9600 / 22250 kcal/m
n
3
93 / 100 MJ/m equal to 22200 / 23900 kcal/m
n
S.
2
4.1.15
INDEX DATE
D
March 2014
O&M_2.002211.810_A_10_2016
3
(See IC-G-D-30-002)
n
3
(See IC-G-D-30-003)
n
3
(See IC-G-D-30-003)
n
3
(See IC-G-D-30-003)
n
3
(See IC-G-D-30-004)
n
3
(See IC-G-D-30-004)
n
3
(See IC-G-D-30-013)
n
3
(See IC-G-D-30-038)
n
3
(See IC-G-D-30-018)
n
S) is the most common one. Hydrogen
2
Dep. 2
S will attack the oil
2
3/5