Re: Fwd:Vibration from flashing valve

sounds like the sizing of the control valve has failed to consider the effect of flashing. fixed the control valve and you fixed the vibration of the line.

> > Subject: Vibration from flashing valve
> > Author: KV Ravichandran
> > Date: 6/25/02 8:55 AM
> >
> > Hi,
> > Can any one give guidelines for quelling vibrations from flashing
control
> > valve.
> > This is my problem
> > There is in one 8" Zirconium line carrying acetic acid/ catalyst
from
> > reactor
> > to flash tank. At the flash tank side the line has one flashing
control
> > valve ,
> > gate valve and a conical expander section of about 4.6m long
where the pipe
> > dia
> > increases from 10" to 26" and connects to the flash tank
eccentrically.The
> > source of vibration is the flashing control valve (shear stream
ball
> > valve)which
> > throttles from 26 bars to 2 bars. The liquid flow velocity is
about 8.5m/s
> > at
> > the valve.Operating temperature of the line is 193 deg C.
> > During the original design two phase flow and vibration was
considered and
> > the
> > line is supported with TICO Vibration isolation pads and U bolt
clamps.
> >
> > Now the platform from the flash tank as well as the structure
supporting the
> > piping near the flashing valve is vibrating.
> >
> > To have an idea about the magnitude of the vibration following is
the latest
> > measurements at the flashing valve.
> > Fcy Velocity
> > Hz mm/sec
> > 4.405 1.418
> > 8.811 1.049
> > 13.22 .6426
> > 22.03 .6278
> > 48.46 1.876
> >
> > Thanks in advance
> >
> >
> > Regards,
> >
> > K.V.RaviChandran
> > Senior Piping Engineer
> > Foster Wheeler Eastern Pte. Ltd.
> >
> >
> >
> >
> >
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>
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Received on Sat Jun 29 06:00:00 2002