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driver checked for absence of "soft foot"


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12:45 Jul 2, 2008
This question was closed without grading. Reason: Other

English to French translations [PRO]
Construction / Civil Engineering / Mining/smelter industrial site
English term or phrase: driver checked for absence of "soft foot"
Motor / driver checked for absence of "soft foot"

From a list of works/equipment to be verified on an industrial mining/smelter plant site.

This comes under heading : Pumps
sub-heading : Installation checking

No other context, no sentence, just this 67 page long list.

Thanks for your help.
Ghyslaine LE NAGARD
New Caledonia
Local time: 01:57

Summary of answers provided
5vérifier l'absence d'un "pied bancal" du moteur
4Vérification de la stabilité de l'appareil / du moteur sur ses pieds
FX Fraipont

Discussion entries: 2



45 mins   confidence: Answerer confidence 4/5Answerer confidence 4/5
Vérification de la stabilité de l'appareil / du moteur sur ses pieds

"SOFT FOOT – Pour contrôler si la machine repose correctement sur ses quatre
pieds. Affichage des corrections à réaliser."

"Soft foot poses a challenge for plant operations and maintenance personnel.
The common term for machine frame distortion, soft foot is caused when one or more feet of a machine are shorter, longer or angled some way different than the rest of the feet. This non-uniformity causes stress on the machinery when the foot is forced into place by tightening the hold-down bolt. Missing shims under a foot, a bent foot, or a deteriorating base plate or foundation can cause this condition. In addition, pipe stress can cause machine frame distortion and, therefore, also is considered a soft foot condition.
When soft foot is present, the intended machine design and clearances are compromised. It can cause high vibration levels because the machinery is unduly exposed to excessive wear with each shaft revolution.
Deflection and Damage
Often, soft foot is not seen as a critical problem, but let’s investigate the damage it can cause. When machine frame distortion exists, the bearing housings are misaligned with respect to one another. This offset, as well as angular misalignment, creates a load on the rotating shaft that results in shaft deflection. When the shaft turns, this results in vibration since the shaft must deflect by double the amount of the deflection at rest, at twice the speed of rotation. For example, at 1,800 revolutions per minute (RPM) running speed, a soft foot distortion provokes 5.184 million deflection cycles every 24 hours (Figure 1). "

Foot-related resonance doesn't seem to be well-known by most vibration specialists. There is usually some knowledge of the possible damaging effects of machinery "soft feet." However, as Update gained more and more experience on this subject, it realized that they are really two separate subjects, each distinctly different from the other. One is the well-known "soft feet," that is, when a machine's frame or feet deflect slightly when the hold-down bolts are tightened or loosened. "

FX Fraipont
Local time: 15:57
Works in field
Native speaker of: Native in FrenchFrench
PRO pts in category: 1736
Notes to answerer
Asker: Oui mais là on dit "absence of soft-foot" il me semble que ce devrait être "vérification d'absence de ?" - Ou alors je ne comprends pas.

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22 hrs   confidence: Answerer confidence 5/5
vérifier l'absence d'un "pied bancal" du moteur

pied qui ne porte pas et qui agit sur l'alignement et produit des vibrations

Local time: 15:57
Works in field
Native speaker of: French
PRO pts in category: 38
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