MAN B&W
Page 5 of 6
MAN Diesel
7.0 0
MAN B&W ME-GI TII engines 198 87 55-1.1
Condition of the fuel gas delivery to the engine
Temperature
Temp. inlet to engine .............................. 45 ±10 °C
The temperature is specified with regards to the
following parameters:
• To reduce condensation on the outer wall of the
inner pipe for double wall piping
• In order that the performance of the engine is
not adversely affected
• To reduce thermal loads on the gas piping itself
• To obtain a uniform gas density.
Quality of the fuel gas
Condensate-free, without oil/water droplets or
mist, similar to the PNEUROP recommendation
6611 ‘Air Turbines’.
MAN Diesel & Turbo’s ‘Guiding fuel gas specifica-
tion’ is listed in Table 7.00.04.
Designation Unit Limit – if any
Lower heat value MJ/kg
Minimum 38 if maximum gas fuel is to be obtained,
below 38 higher pilot fuel oil amount might be required
Gas methane number No limit
Methane content % volume No limit
Hydrogen sulphide (H
2
S) % volume Max. 0.05
Hydrogen (H
2
) % volume No limit
Water and hydrocarbon condensates % volume 0
Ammonia mg/Nm
3
Max. 25
Chlorine + Flourines mg/Nm
3
Max. 50
Particles or solid content mg/Nm
3
Max. 50
Particles or solid size μm Max. 5
Gas inlet temperature °C Max. 45 ±10
Gas pressure According to MAN Diesel & Turbo specification
Table 7.00.04: Guiding fuel gas specification
178 53 63-3.0
The following data is based on natural gas as fuel
gas.
Pressure
Operating pressure ......................(See Fig. 7.07.04)
Maximum value for design at full flow .......315 bar
Safety relief valve .......................................320 bar
Pulsation limit .............................................. ±2 bar
Flow
The maximum flow requirement is specified at
110% SMCR, 315 bar, with reference to an LCV
value of 38,000kJ/kg.
Maximum flow requirement ...................... Refer to
‘List of Capacities’, or CEAS report
Minimum flow requirement ..........................0 kg/h
The maximum flow requirement must also be
achievable close to the overhaul interval of the
FGS system. In case of a specific LCV require-
ment, please inform MAN Diesel & Turbo.
Under certain circumstances, modification of the
gas valves may be required to accommodate a
special LCV lower than 38,000 kJ/kg.
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