RE: Piping stress analysis of Vertical reboiler

From: <HITESH>
Date: Sat Aug 18 2007 - 01:24:00 EDT

Hi Steve,

I have already used higher spring rate to minimise the difference in vertical movement of reboiler during operating and empty condition.

You are right that spring is for permitting differential expansion, but during spring unlock condition system should be safe in empty as well as operating conditions with same spring design.

Regards,

Hitesh N Prajapati
669-1654

              "Steve McKenzie"
              <gyro-@hotmail.co
              m>                                                         To
              Sent by:                  PipingDesign@yahoogroups.com
              PipingDesign@yaho                                          cc
              ogroups.com
                                                                    Subject
                                        RE: [PipingDesign] Piping stress
              08/18/2007 10:17          analysis of Vertical reboiler
              AM


              Please respond to
              PipingDesign@yaho
                 ogroups.com

Hi Hitesh N Prajapati

Try a much higher spring rate and see how you get on. The purpose of the spring is probably for for permitting differential expansion, not for weight change compensation.

Cheers

Steve

>From: HITESH N PRAJAPATI <HPRAJAPATI@ltcis.ltindia.com>
>Reply-To: PipingDesign@yahoogroups.com
>To: PipingDesign@yahoogroups.com
>Subject: [PipingDesign] Piping stress analysis of Vertical reboiler
>Date: Sat, 18 Aug 2007 09:58:21 +0530
>
>I am involved in piping stress analysis for vertical reboiler connected to
>column. Reboiler is nozzle is directly connected to column through 800mm
>straight spool.
>
>I have done analysis based on operating condition ( with fluid weight in
>reboiler ) and system is safe with selected springs ( Reboiler is
supported
>by four nos of springs). Reboiler and its springs are supported from
>separate structure from grade.
>
>Problem start when I unlocked the springs of reboiler during empty
>conditions. Very huge amounts of loads are being transferred to column and
>reboiler nozzles. Reason for that is , during reboiler empty condition
>spring exerts upward forces on reboiler - column nozzles.
>
>I tried several options but reboiler-column configuration is safe either
in
>empty or operating conditions but could not be safe in both conditions
with
>springs unlocked.
>
>May I have your expert opinion to come out this problem.
>
>Regards,
>
>Hitesh N Prajapati
>669-1654
>
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=== Received on Sat Aug 18 01:24:00 2007