Pellerin Milnor Corporation
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If the owner/operator does not possess the necessary expertise to ensure that the facility can safely
and functionally accommodate the equipment, it will be necessary to consult the appropriate ex-
pert(s), such as a structural engineer, soils engineer, and/or architect.
Major Design Considerations
BNUUUI01.C03 0000189358 D.2 C.3 A.5 1/2/20 2:14 PM Released
•
Vibration and/or noise can be felt or heard outside of the laundry room as a result of the fol-
lowing, if supporting structures are not sufficiently rigid:
–
Extraction (the spinning cylinder) in washer-extractors and centrifugal extractors, imparts
sinusoidal forces to supporting structures as shown in
Figure 1: How Rotating Forces Act
. In rigid washer-extractors, these forces are up to 30 times
that of suspended washer-extractors of the same capacity.
–
Extraction forces can be magnified many times if the rotation frequency matches the reso-
nant frequency of supporting structures. To avoid this, supporting structures must have a
natural resonant frequency many times greater than any possible rotation speed of the ma-
chine or combination of rotation speeds of all machines.
–
Each time goods fall in the rotating cylinder of a washer, washer-extractor, centrifugal ex-
tractor, or dryer, this can impart a force to the supporting structures.
–
The intermittent start and stop actions of large components inside the machine, particu-
larly in a tilting washer-extractor, press-extractor, or centrifugal extractor, can impart in-
termittent forces to the supporting structures.
•
The possibility of adverse consequences is significantly greater for upper floor installations
than for installations at grade. Always consult a structural engineer for such an installation.
•
The possibility of adverse consequences is significantly greater for installations at grade if
subsidence causes a void between the foundation and the soil or if the soil itself does not pro-
vide adequate strength and rigidity. Some possible remedies are the addition of pilings or a
deeper foundation, installed as to be monolithic with the existing foundation.
•
Machine forces can cause damage to the machine or the floor without the correct anchorage.
•
Applicable building codes, even when met, do not guarantee sufficient structural support and
isolation of machine forces to the laundry room.
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