Re: [MW:17329] Tank Welding

sometimes we should carry out pwht on constructed tanks due to force major working at site like as your situation. in this case you can performing pwht on clean out opening if required by applying of sufficient restrain on shell around of opening . H beam which is bends as same as diameter tank is good choise.

best regards

k. zamani

deputy of construction manager

project managing consultant

urea&ammonia phase3

assaluye

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From: george keribo <berepele@gmail.com>
To: materials-welding@googlegroups.com
Sent: Wednesday, April 10, 2013 11:59 AM
Subject: Re: [MW:17327] Tank Welding

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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