Page 47 - Uninterruptible Power Supplies

Standby Power Generating Sets
Standby Power Generating Sets 45

Pollution from Diesel Engine Cooling and
Ventilation Air
The air outlets will be a source of warm air polluted with various leak-
ages and fumes from the hot engine surfaces; the outlets should be situ-
ated well away from any air inlets associated with building ventilation.

Gas Turbine Combustion and Ventilation Air
For gas turbines a similar approach should be taken, the amount of
exhaust gas will be greater, there will be no radiator, but there will be
a combustion air inlet and a ventilation air inlet and outlet, and air
may be required for an oil cooler.

Vibration
Diesel engines, and to a lesser extent gas turbines, will produce vibra-
tion which to some degree will be transmitted to the building structure.
Some thought should be given to this if the building is occupied or is in
some other way sensitive to vibration.

Accessibility
The proposed site for the generating set must obviously allow for the
initial installation of the set and should allow for future maintenance.
Sometimes building work continues after installation and, if the work
is of a structural nature, it can prevent the removal of a set in the
unlikely event of a catastrophic failure. Installations exist where the
engines are literally built into the building and cannot be removed,
multiset installations exist where access is at one end of the room and
the removal of the “first installed” set would involve the removal of the
other sets. The avoidance of such installations demands an awareness
of the problem at the early planning stage; these difficulties arise more
often in congested, built-up areas such as city centers. The problem
can sometimes be simplified by partly dismantling the set, the gener-
ator, the radiator, and even the cylinder heads can be removed fairly
easily.

Other Considerations
Except for the smallest sets access to a supply of fuel will be needed;
provided that a route exists this can be piped fairly easily from the bulk
tanks. To avoid long distribution cables and associated voltage drops
the set should be close to its electrical load.

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