Technical information
27
Gas reserve tank at gas station inlet for sets with 100% load acceptance
(only where required)
In order to prevent a drop in output at the moment of 100% load acceptance, a reserve
tank with
about 400 litres capacity
is required for the E 2842 E in the gas supply line ahead of the gas station inlet, prefer-
ably in the main flow.
If connected in a bypass, the connecting pipe to the gas mains should be as short as
possible and with at least 50 mm bore.
Gas pressure monitor for maximum gas pressure upstream of gas regulating sta-
tion (this is required in all cases)
Within the gas regulating station associated with each gas engine, only the minimum gas
pressure downstream of the gas filter is automatically monitored by the control system.
The necessary maximum gas pressure monitor is generally arranged ahead of the gas
regulator station, but downstream of the initial pressure gas regulator, where one is pro-
vided. In the case of multiple engine plants, only one gas pressure monitor is required in
the central gas supply for the complete plant.
Similar to the minimum gas pressure monitor, the control system closes the gas lock, but
in this case when the maximum permissible gas pressure upstream of the gas regulator
station is exceeded. In the case of multiple engine plants, all engines will be shut down
simultaneously in this case.
Initial pressure gas regulator (only where required)
If natural gas is available at the site of the gas engine set only in the medium-pressure or
high-pressure range, it is necessary to install an initial pressure regulator (two-stage type
may be called for) in the central gas supply line to reduce the pressure of the gas to the
permissible low pressure range upstream of the gas regulating station.
Points to be noted in selecting the initial pressure gas regulator:
It is recommended that the contractor installing the generating set retain a gas equip-
ment supplier to advise on the selection of the intial pressure regulator.
The gas flow must be large enough, in conjunction with the reserve gas tank described
below, to avoid a drop in output at the moment of load acceptance, especially in the case
of sets which are required to accept 100% load and multiple engine plants.
The valve opening characteristic of the initial pressure regulator must not be too slow
and must ensure that, at the moment of load acceptance, sufficient gas is available for
accelerating the engine.
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