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  1. Mike9208

    Centrifugal pumps running in parallel, one pump with high vibration

    Thank you all for valuable comments. the plant is in operation so, every test or modification needs to go under carefully planning. Operation team agreed to operated pump A and C, and keep pump B in stand-by. Once we have time window, we will inspect pump A and C to see condition of shaft and...
  2. Mike9208

    Centrifugal pumps running in parallel, one pump with high vibration

    Georgeverghese (Chemical), we dont have suction strainer in these pumps, the eq water is Oily Water/ Domestic Wastewater with Total suspended solids of 2400ppm (0.240wt% solid)
  3. Mike9208

    Centrifugal pumps running in parallel, one pump with high vibration

    Performance curve and trend for current. When pump B runs in parallel with other pump absorbs 41-42Amp, while other two pumps are stable at 48Amp https://files.engineering.com/getfile.aspx?folder=75f443fc-7fd0-4517-9257-ee9020b04b33&file=performance_cruves.pdf
  4. Mike9208

    Centrifugal pumps running in parallel, one pump with high vibration

    vibration report attachedhttps://files.engineering.com/getfile.aspx?folder=19e12424-702d-41cb-93be-f42c13c25d12&file=10-P-5655B_20240710_Inspection_report.pdf
  5. Mike9208

    Centrifugal pumps running in parallel, one pump with high vibration

    thanks for valuable comments. The view I posted orginally is top view, these three pumps are horizontal OH1 type. Pumps runs with motor without VFD, and without gearbox. I will send in attachment the PID arrangement, pump curves (from performance test) and vibration report. In our opinion is...
  6. Mike9208

    Centrifugal pumps running in parallel, one pump with high vibration

    Thanks for the replies, 1- Suction common header is 18" and pipe enters in 10" in each pump, discharge goes 10" from each pump and increase to 18" 2- One of the strange things is that the PG at discharge of pump B fluctuates from 4.2kg/cm to 4.5kg/cm2, while pump A or C is stable in 4.5. I...
  7. Mike9208

    Centrifugal pumps running in parallel, one pump with high vibration

    Hi to all colleagues out there, In the ethylene plant that company where I work is biulding there are three ITT Goulds Non-API pumps OH1, namely P-1234A/B/C, running with equalized water, rated capacity each one 300m3/h@40.3m. There are several operating cases, but the normal one requires two...
  8. Mike9208

    Mechanical Vibration on API Pump VS4

    Thank you all for the valuable comments. A lot of information to process, I dont have background as VA but this problem now is under my plate so I appreaciate all the feedback and recommendations... I will start by checking the installation (alignment, TIR, leveling) and then I will see the best...
  9. Mike9208

    Mechanical Vibration on API Pump VS4

    Hi Geesaman.d This pump runs without VFD. if we took measurements moving up from mounting surface to compare amplitude, and supposing it was a resonance issue, what would I expect to see in the amplitude? around zero at bottom and max amplitude in the top of the motor?
  10. Mike9208

    Mechanical Vibration on API Pump VS4

    hi electricpete, Thanks for your valuable comments. The two spectra are as you indicated in last sentence, same time in orthogonal directions: Tthe 1x high peak and directionality also leads us to suspect resonance. Is there any additional vibration measurement in your opinion that could...
  11. Mike9208

    Mechanical Vibration on API Pump VS4

    Dear Colleagues, Looking for some advice. On the plant where I work, we have an API 610 VS4 pump. The pump is having high vibration only in one radial direction (almost 6mm/s - too high for a newly commissionned mechine), while axial and other radial vibration are within ISO limits. This pump...
  12. Mike9208

    API 610 VS4 Mechanical Seal and Seal Plan

    Colleagues, I am working on specifying some pumps for an LNG plant, and I am struggling with the mechanical seal and seal plan for the VS4 type API 610 pumps. All the VS4 pumps will be installed in drums, therefore, as per API 610 this is a closed system requiring a vapor-proof construction...

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