August 29, 2012
PUMPS & SYSTEMS • August 2012 By James Laxson, Hi-Speed Industrial Services in collaboration with Mike Fitch, LUDECA, Inc. In May 2010, an electric motor repair service provider in Little Rock, AR, began a condition monitoring program for a new customer. The customer opted for quarterly data collection. Read article Pump Train Component Failure, a [...]
August 27, 2012
If using jacking bolts for your side-to-side corrections, always remember to back off the jack bolts on the opposite side. Remember that once you are done with your side-to-side correction, we recommend to always back off all jackscrews after the alignment is completed and the anchor bolts are tight. If movement is known to occur, [...]
August 22, 2012
Use Shaft Alignment Tolerances to help solve base- and bolt-bound situations. If, when performing an alignment, a base-bound or bolt-bound situation presents itself, take advantage of using the outer limits of your shaft alignment tolerances to help alleviate the situation. It may be possible to optimally position the machine so that the shafts may be [...]
August 20, 2012
Setting the proper LOR is essential to be able to separate closely spaced defect frequencies. An example would be a pump with 5 vanes that could generate a “Vane Pass” frequency equal to the number of vanes, or 5 times rotational speed; if the impeller end of the pump had an SKF 7301BEP bearing, it [...]
August 15, 2012
Overall values are the most common measurements and calculations used in vibration analysis. The purpose of this measurement and calculation is to identify changes in the condition of the equipment being measured. Overall measurements are an important tool for the vibration analyst. However, generic overall values can actually be deceptive if their limitations are not [...]
August 13, 2012
When you get bolt-bound or base-bound on a critical machine train, usually one that is very difficult to move, it is not enough to just be able to fix individual pairs of feet to obtain alternative shimming or moving solutions. You need even more flexibility: the ability to minimize moves across all the feet. The [...]
