Re: Column Reboiler problem

While changing the gaskets, what is the procedure followed ? Whether springs were in "locked" condition before emptying the re-boilers ?

Regards,
Shreedhar.
----- Original Message -----
From: "Tanmoy Saha" <Tanmoy.Saha@Halliburton.com> To: <PipingDesign@yahoogroups.com> Sent: Thursday, September 12, 2002 3:54 PM Subject: [PipingDesign] Column Reboiler problem

> Hi all
>
> This is a problem observed and raised by one of my friend. My views are as
> below
>
> Information is not complete. Further information like full detail of the
> column at least the distances of the nozzles from bottom tangent line of
the
> column is required.
>
> However it looks like it is not a stress problem as there is mismatch of
two
> nozzles. If it was a stress problem both the nozzles should have deflected
> same way and there shouldn't have been any relative displacement. Possible
> things are
>
> a. the nozzles were offset at the beginning itself and forcefully joined
by
> some tricks. (most likely)
> b. the tower and the reboiler were not at the same temperature which is
less
> likely.
>
>
> Am I correct? What do you think?
>
> Thanks
>
> Tanmoy Saha
> Kellog Brown & Root, Singapore.
> Ph. 6422 2535
> Email. <a href="/group/PipingDesign/post?postID=W9717xeRjfF9tBI5kSrWdsDIMxQKmuK0Qvzwl7YTgZfK541uwA8tA8OETKoX7Dw1alfwZzgBC4ibtN2CDzgv8ux6gw">Tanmoy.Saha@Halliburton.com</a>
>
>
>
> Problem:
>
>
>
>
> COLUMN
> Reboiler
> 80" connection
>
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> Reboiler
> Flange
>
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> 4 Lugs
> 2 Springs
> per lug
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> There is a column with a reboiler connection of 80" size. The reboiler is
> supported on 4 lugs and there are 2 F type springs below each lug. Each
> spring takes a load of about 10 tonnes. The reboiler is very heavy. The
> reboiler is supported on a separate concrete structure.
> After about 8 years of operation client found out that the 80" connection
> nozzle flange and the reboiler body flange were leaking. So to replace the
> gaskets the reboiler was disconnected at the the 80" nozzle flange and the
> body flange. When they were refitting the removed part of the reboiler
back
> to the original position, they first connected the 80" nozzle flange. Then
> they found out that there was 10 mm gap between the two body flanges.
> Nobody is able to guess what happened. The lugs are still touching the
> spring load flange. The pointer on the flange is at topmost position and
not
> at center.
> There are 30" piping connections on the downward part of the reboiler.
>
> Can u suggest any reasons what could have gone wrong ??
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> [Non-text portions of this message have been removed]
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> Texas Flange - a good source for information on industrial flanges, all
they ask is for referrals for designs they help with.
> 877-610-8924.
> www.texasflange.com
> =====================================================
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Received on Sat Sep 14 01:39:00 2002