RCM-2009 Reliability Centered Maintenance Managers' Forum - March 23-26 - Daytona Hilton Ocean Walk Village - Daytona Beach Florida Join or Manage Your Profile Posting Boards Machinery Condition Monitoring and Predictive Maintenance Posts About Technologies and Techniques for Condition Monitoring Soft Foot
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Dear all,
i am working in newly commissioned alumina refinery, here we found softfoot in lot of machines, tell me the best method to remove soft foot in the machines. Regards Guru |
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Gurusamy,
There are two methods to detect soft foot. 1. By dial gauge- Put a dial gauge near the holding down bolt and loosen the bolt. Note dial reading. If it is more than 0.002 inches or 50 microns put ss shims under that foot and tighten the bolt. Move to another foot, place dial gauge and repeat the procedure for all four feet. After one complete turn , repeat it once more and do the necessary correction. 2. Laser technique.- Most of the LASER alignment tools available in market today can diagnose soft foot. The procedure is similar to the dial gauge method but we measure the soft foot effect on coupling instead. Refer to the OEM brochure of the tool for details. This message has been edited. Last edited by: AKHTAR, |
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The across the coupling laser or dial method is only good for small rigid machines - never use it on large turbo machinery or pedestal bearing machines.
The dial indicator at the foot also has a limitation (see step below) but is a good and an effective method. Generally there's a soft diagonal and a 'hard' diagonal as a four-legged stool only rocks in one plane. On large feet the diagonal deflecton may be in both feet. In addition; you must be aware that a wedge foot may also exist but generally deflections less than 2 mils will be acceptable. On very large machines where mass overcomes stiffness and especially where a machine has six or eight feet it may be necessary to shoot the feet in or set the shim packs to the same plane. There are laser techniques or optics or electronic levels that can accomplish this. Need more? sampickens@sprintpcs.com Cordially, Sam Pickens pdmsampickens@gmail.com |
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You can also use a feeler gauge. Loosen all four hold down bolts, and measure the feet at several positions around each one. This is especially helpful if you have a angular soft foot.
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What is the weight ratio of the pump to its foundation plinth? Is it sufficiently designed?
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Sam, what about soft foot in vertical pumps? There are so many things involved. Motor base, motor stool, pump stool, foundation plate and concrete. So many locations to measure phase change. How to get an accurate idea? |
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RCM-2009 Reliability Centered Maintenance Managers' Forum - March 23-26 - Daytona Hilton Ocean Walk Village - Daytona Beach Florida Join or Manage Your Profile Posting Boards Machinery Condition Monitoring and Predictive Maintenance Posts About Technologies and Techniques for Condition Monitoring Soft Foot
Join or Manage Your Profile Posting Boards Machinery Condition Monitoring and Predictive Maintenance Posts About Technologies and Techniques for Condition Monitoring Soft Foot
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