Re: Fwd:Vibration from flashing valve

From: <Geoff>
Date: Wed Jun 26 2002 - 23:06:00 EDT

This severe service application only can be dealt with by a relatively few companies around the world. Suggest you contact Flotech Controls in Sydney 61 2 9949 4888 Ron Rodrigues at rrodrigues@flotechcontrols.com is very knowledgeable on the subject.

Ron used to one of the managers for Valtek in Australia where they manufactured many valves for the North West Shelf projects. He has also marketed CCI,Mannesmann other severe service valves for many years.

The solution isnt going to be cheap but it will work.

Geoff Stone
--- Paul Bowers <pbowers@pipingdesign.com> wrote:
> ____________________Forward Header_____________________
> 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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