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Pellerin Milnor Corporation
Vital Information About the Forces Imparted to
Supporting Structures by Laundering Machines
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This document replaces Milnor ® document BIWUUI02.
All laundering machines impart static and dynamic forces to the supporting structures (foundation
and soil, floor, and building). Static forces include the machine weight plus the weight of the
goods and water. Dynamic forces are those imparted by various machine movements as explained
in
Major Design Considerations This topic can be found in Milnor document elsewhere . The dy-
namic forces imparted to supporting structures can cause vibration and noise outside of the laun-
dry room if supporting structures are inadequate.
1. Disclaimer of Responsibility
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Pellerin Milnor Corporation accepts no responsibility for damage or loss as a result of:
• inadequate supporting structures
• interference with the use of the facility caused by machine operation
The facility owner/operator is solely responsible to ensure that:
• supporting structures are strong enough, with a reasonable safety factor, to safely support the
operating machine or group of machines
• supporting structures are rigid enough to isolate vibrations and noise to the laundry room
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.
2. Major Design Considerations
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• 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
On the Foundation, page 2 . 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.
I
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