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Whirl in vertical pumps

Whirl in vertical pumps

Whirl in vertical pumps

(OP)
    
  ¿Is whirl the only or more frecuent cause of  subsynchronic vibrations in vertical pumps ?

RE: Whirl in vertical pumps

Hi Split
in my world, whirl is the most common cause of subsynch vibration although pulsations from other sources is right up there too.
Karassik (Pump Handbook) has a good table showing the relative frequency of various vibration causes.

Cheers

Steve

RE: Whirl in vertical pumps

Other possibilities include: A rub, flow induced instability, check bearing cage fault frequency. Also,as the pump is loaded, additional stiffening occurs from internal seals and wear rings. This could increase the resonance frequency.

Dave G.
www.reliabilitydirect.com

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