[MW:14454] Re: 14426] Tank Clean out door PWHT

no possible see belo from API 650

5.7.4 Thermal Stress Relief
5.7.4.1 All flush-type cleanout fittings and flush-type shell
connections shall be thermally stress-relieved as an assembly prior
to installation in the tank shell or after installation into the tank
shell if the entire tank is stress-relieved. The stress relief shall
be
carried out within a temperature range of 600°C – 650°C (1100°F –
1200°F) (see 5.7.4.3 for quenched and tempered materials)
for 1 hour per 25 mm (1 in.) of shell thickness. The assembly shall
include the bottom reinforcing plate (or annular plate) and the
flange-to-neck weld.

BR,
Sikhandar

On Jun 1, 12:45 pm, "eccospi" <ecco...@gmail.com> wrote:
> Dear Mr.Thomas.,
> Re a/m subject. Regarding the PWHT:
> 1.       it is either based on the standard you are using as API 650 general
> requirement as in relation to thickness and material type and grad or as
> special conditions : internal material is lethal or the subject ligament
> will be under sever stresses regardless of thickness. Which also affect
> the intensity of RT.
> 2.      Yes you can do localize PWHT but you need a specialized capable team
> and equipments most preferable in my opinion using gas heaters with
> recordable      chart readers.
>
> Best rgrds
> D.eng.A.Aziz Gendia
> ecco-spi President & CEO
> Mob.: +2012 21 33 956
> Fax: +202 2477 8411
> e-mail: ecco-...@gmail.com
>
>
>
> -----Original Message-----
> From: materials-welding@googlegroups.com
>
> [mailto:materials-welding@googlegroups.com] On Behalf Of thocho37
> Sent: Thursday, May 31, 2012 7:19 AM
> To: Materials & Welding
> Subject: [MW:14426] Tank Clean out door PWHT
>
> Hi, Can any one tell whether I can carry out PWHT of clean out door welding
> after erection of first shell course?
> We have erected the clean out door section of the shell plate and completed
> vertical welding without performing the PWHT. As per API 650, it needs to be
> completed PWHT regardless of thickness before assembly(erection).
> if that is the case, I have to cut the joint and do the PWHT and reweld
> again.Can I do PWHT at site after erection?
> If not, any one explain me what is the reason behind it. Why API is
> insisting to have PWHT before erection.
> Cheers,
> Thomas
>
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