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motor that elevated it to line up with the pump literally rang like a bell, resonating at 1,200 cpm. If in doubt, the bump test is a quick way to identify resonance problems. If in doubt, the bump test is a quick way to identify resonance problems.
Pump discharge recirculation lines can cause a vibration every time the impeller passes the recirculation line tap off. This vibration will affect the mechanical seal and like all vibration, can be recognized by chipping on the outside diameter of the carbon face and worn drive lugs.
2 x Line frequency LF Radial/Axial Electrical Vibration Motors Generators Rotor bars x rpm side bands at 2 x LF Radial High Frequency Electrical Vibration Stator slots x rpm side bands at 2 x LF Radial High Frequency Electrical Vibration
A Vibration Problem in Vertical Circulating Water zDominate frequency at 1X running A pump vibrations were more than 5 times those on the B pump,
Vibration Troubleshooting Field Guide. LINE FREQUENCY: 60 Hertz Imbalance in vertical machines is usually highest transverse to the flow or in the most
vibration on this pump was recorded on the motor at over 0.65 IPS at approximately 1,750 CPM. The slightly less than half times peak frequency was also noted in the two pumps placed in the first pit at a much lower intensity. With this information, it was determined that there was
Fundamentals of Vibration Measurement and Analysis Explained that generate high frequency vibration lower than 2.56 times the highest frequency in the
I have a velocity/CPM peak vibration spectrum plot of an Aurora fire pump with 6 impellers. The pump operates at 3550rpm and weighs 2275lbs. How can I determine
On 2 pole motors, the twice line frequency vibration level will appear to modulate over time due to its close relationship with 2 times rotational vibration. Problems in a motor such as
Balance, Vibration, the vibration in the horizontal, vertical and pulses that occur at two times the line frequency.
Beginning Vibration 2 Introduction Understanding the basics and fundamentals of vibration analysis are using a 800 line analyzer and a 200 Hz frequency span?
all the vibration was at two times running FortyEight Case Histories of Intriguing Machinery Problems frequency of a vertical pump made of steel will not
Application Notes Vibration Diagnostics for Industrial Electric Motor Drives The induction motor is the most widely employed industrial electricdrive.
Pumps 101: Operation, Maintenance and Monitoring Basics Pump vibration analysis a straight section of pipe, ideally a section 10 times the diameteror a 60
The 21,600 peak is 8.2 times 2FL& 39;s away from the rotor bar Draeger pump and tubes A 6 times line frequency vibration that was first noticed about 7 weeks
PERPLEXING VARIABLE FREQUENCY DRIVE VIBRATION rotational motion about a vertical axis through the mechanical natural frequency measurement. Table 2:
Excessive resonant induced vibration occurs in a vertical pump when the natural frequency Figure 2. Natural frequency is close to and deceleration times.
A Vertical Pump Case History Ali M. AlShurafa Email: ashurafa remove.all.in.and.brackets @gawab.com Jubail Industrial College Saudi Arabia Key words: Resonance, pump, vibration, impact test, stiffness, structure Background: The case history in this article is for a vertical cooling water pump delivering seawater from a bay to a power plant& 39;s heat exchangers. The maintenance activities
Vertical, inline, centrifugal pumps with CUE 4.2 Mounting of pump Grundfos inline pumps are designed to be mounted in horizontal vibration and prevent any
The task of this type vertical pump 165 Fig.1,2 first bearing SKF 7320 in two different measuring times exist because of equal the vibration frequency and
Vertical pumps are quite different from other piping is hardcoupled to the pump; Motor or drive reed frequency reed and line shaft vibration
Vertical inline split coupled pumps with integrated VFD Pump Information Page 2. operating your Grundfos Type VLSE Vertical Inline Centrifugal Pump.
The amplitude of the vibration response can be amplified 2.5 times or higher at or nearponent natural critical resonant frequency. Field Vibration Problem Example The writer was recently asked to investigate an excessive vibration problem on three new replacement vertical sewage lift pumps, which had a different design then the original
a highfrequency whine from the vertical motor disconnected from the pump, Figure 2. down the line. This vibrationrelated production process
High vibration ismon problem for motors installed on top of vertical pumps. Its source can stem from a mechanical issue with the pump, motor, or coupling or even hydraulic forces from the pump. Structural issues involving reed frequency resonance often amplify the problem, but
I. MODES OF VIBRATION direction and the dotted line is its maximum vibration in the other direction. The nth mode has a frequency of n times times the
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