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2‐6 General Information MN2408
S Steel spring isolators are a very effective and commonly used. Steel spring isolators
are typically 95-98% efficient (reduces the transmitted vibration 95-98%) while a pad
type can be 75-88% efficient. Spring isolators also level the genset sub-base in the
event the foundation pad is not perfectly level.
Spring steel isolators offer the highest level of vibration isolation, however higher levels
of vibration (although not detrimental) may be seen on some areas of the genset when
mounted on steel springs, due to the (almost) total isolation from the foundation. The
base of most steel spring isolators contains a non-skid pad. The base should be
mounted to the foundation pad as shown in Figure 2‐1 or as recommended by the
isolator manufacturer.
A common practice is to pour a concrete pad directly on top of the floor slab and to
mount the genset on this pad. The purpose of the pad is to facilitate cleaning around
the genset and to provide a more level base. When using this method, floor strength
must support the pad and the genset. The pad should be at least 6in (150mm) thick
and extend beyond the genset in all directions 12in (300mm).
Weight Of The Genset
The dry weight of the entire genset is shown on the Generator Set Specification Sheet. The wet
weight includes the fluids (coolant and oil). Figure 2‐2 can be used to design the foundation
except in critical situations.
Figure 2‐2 Approximate Weight vs. kW Output