Wednesday, April 10, 2013

Re: [MW:17337] Tank Welding

Dear Friend 

First you need to give proper support in preassembly of Clenout door to resist  deformation which will come out during the Strees Relieving Process.
After  that u have to Select location of you couple  As per  API 650. 



On Wed, Apr 10, 2013 at 12:29 PM, george keribo <berepele@gmail.com> wrote:

I want to know if there is a different way to perform stress relieving on a tank cleanout flush opening assembly after is has been installed . Because according to API 650, stress relieve to be done on the preassembled cleanout fitting ..5.7.7.3 before installation. I need a suggestion on how to carry out the thermal stress relieve.

On Mar 16, 2013 12:18 PM, "george keribo" <berepele@gmail.com> wrote:

Thats my calculation also buh my coleague had a different consideration , he calculated it considering the shell thickness ... I got it ,, thnx

On Mar 16, 2013 9:18 AM, "Karthikeyan R" <rkarthikeyanapt@gmail.com> wrote:
HI,
 
The Plumbness depends upon the height from where you measure, you should not consider the thickness,
 
According To API 650 the Maximium out of Plumness should be 1/200
 
for your case you want to measure for the first course 2.5Mts (2500 mm)
 
so the calculation should be 1/200*(2500 mm)
 
i.e.,  ± 12.5mm ( The Shell course can lean inside or outside).
 
and the valuse you can measure ever 45° intevals (0°, 45°, 90° etc)
 
 
Regards
 
karthi


 
On Sat, Mar 16, 2013 at 12:15 AM, Jorge Mejía Lema <jmejialema@gmail.com> wrote:
I have very good experiance in tank construction: the pumbing tollerance should be cero (o.ooo) true vertical because this course is the reference base.
regards,
jml 


2013/3/15 george keribo <berepele@gmail.com>

Yes i know all of that but still need to know the acceptable criteria for 20mm thick shell plate with 2500mm height ... Im designing a tank of 33m diameter and 15m height. I want to take plumbness on the first course on 2.5m ....need to knw wat to have as out of plumbness acceptable criteria .

Thanks

On Mar 15, 2013 11:49 AM, "Usman Iqbal" <usman808@gmail.com> wrote:
ASTM A 6 acceptance criteria for flatness and waviness applies to each shell ring

Thanks
Usman

On Thu, Mar 14, 2013 at 9:17 PM, george keribo <berepele@gmail.com> wrote:

Plumbness and verticality check on tank first shell course . What is the calculation on how to check and the acceptable tolerance for each shell .

Thanks for your insights

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