Engineering manual - SAB 193-233-283 S A-frame (including ATEX)
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008831 en 2020.10
Installation instructions
7.20 Laying the unit foundation
When mounting a standard unit for stationary purposes, there are three options as described in
the following:
a. Mounting directly on the foundation
b. Mass damping between unit and building
c. Damping using vibration dampers
7.21 Mounting directly on the foundation
When installing a unit directly on a concrete foundation, the foundation should be cast in accord-
ance with the foundation drawings. In principle, the foundation is designed as shown in Fig. 76.
Fig. 76: Foundation sketch
When the foundation has been cast with the holes set out (see foundation drawing) and has hard-
ened, the unit is positioned on wooden beams in a flush position. Adjust the height of the beams
so that the foundation plate is slightly recessed into the foundation, see Fig. 76.
To make sure that the foundation plates are kept close to the base frame during the casting proc-
ess, secure the foundation plates to the base frame by means of steel wire.
The concrete used for the foundation bolts must be dry, i. e. it must have a low water content.
Stamp down the concrete around the bolts and the foundation plate.
It is important that the concrete has a low water content as this prevents the hardening concrete
from shrinking.
10-14 days should pass before tightening the foundation bolts. Remove the steel wire and the
wooden beams beforehand and check that there is no air space between the foot plate of the base
frame and the foundation plate. Otherwise, shims must be inserted between the plates before
tightening them.
As shown in Fig. 76 the foundation has been cast as part of the machine floor and as indicated it is
100 mm above the floor surface.
With this type of foundation, vibrations can be transferred from the unit to the building. Read sub-
sections 7.22 Mass damping between unit and building and 7.23 Damping using vibration damp-
ers on how to reduce the vibrations.
Note: When installing a compressor unit on other floors than the lowest, consider that floors sus-
pended by steel beams tend to have a higher natural frequency and carry vibrations better. This
means that the installation should be done on either a sufficiently heavy elevated concrete slab
with machine shoes, or the unit should be installed on suitable dampers. See subsection 7.22 be-
low for details on the elevated concrete slab.
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