Transverse crack

kareem.021181 · **Posted:** Sun Dec 13, 2009 6:52 pm

Gas cooler was fabricated using
material -- SA 543 Gr.B Cl 1
thk -- 53mm

Neither PWHT nor temper bead welding was performed as per ASME VIII div.2.
After 1 month of service the closing seam & the nozzle weld near the seam experiences transverse crack

Question 1 -- Is this is due to high residual stresses on the weld (or) the vessel should have been PWHT by the manufacturer?

Question 2 -- What is the purpose of using Boss type nozzle for this cooler?

Dr. Koelbl · **Posted:** Sun Dec 13, 2009 11:14 pm

Cool, looks like a good proof that PWHT has a meaning.

Isn't it mandatory for the material and thickness?

DK

kareem.021181 · **Posted:** Fri Apr 16, 2010 8:04 pm

sorry for my late reply.

Please Refer ASME VIII,Div 2(2007 edition), part 6 - Fabrication requirements,Table 6.17 Note-2,which implies PWHT is neither required nor prohibited.

akonrad · **Posted:** Fri Apr 16, 2010 8:11 pm

Kareem, I have no answer neither, sorry. But now looks like a metallurgist diploma has a meaning :-)

kareem.021181 · **Posted:** Fri Apr 16, 2010 8:22 pm

Several petrochemical companies(Ethelene glycol plant) using the reactor of this material are running with transverse cracks(many in numbers in one circular seam).

Already a petrochemical company in my place has ordered a new vessel (replacement) of material SA 302 Gr.C

teresap989 · **Joined:** Fri Oct 08, 2010 9:08 am **Posts:** 1

akonrad wrote:

Kareem, I have no answer neither, sorry. But now looks like a metallurgist diploma has a meaning :-)

I also think so.thanks

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