Recently we have ordered 8" X 20.62 mm thk 90 deg SMLS long radius (1.5 D) A403 WP 316L modified(Urea grade) elbows to be supplied as per ASME B 16.9 standard.
On verification of the elbows received at our site we found ovality in the mid section of the elbows.
The sketch showing the dimensions measured in the mid section is attached for reference.
When we verified ASME B 16.9 we found information about acceptance for out of roundness at end only.
Nothing was mentioned about acceptance criteria for ovality at the middle of the 90 deg elbow.
Learned members are requested to guide me in this matter .
regards
M.S.R.K.Srinivasa Prasad
A.G.M ( General Engg)
Nagarjuna Fertilizers And Chemicals Ltd
Nagarjuna Road
KAKINADA-533003
Ph: 0884-2360212(O),9676931414
2379302(R)
----- Forwarded by M S R K S Prasad/MAINT/KKD/NFCL/NAGARJUNA on 01/09/2016 11:37 AM -----
| From: | "PEMMARAJU RAGHAVENDRA" <rpe@hzw.ltindia.com> |
| To: | <materials-welding@googlegroups.com>, |
| Date: | 15/01/2010 10:00 AM |
| Subject: | Re: [MW:4049] Linear Indications After Pickling and passivation and PWHT |
| Sent by: | materials-welding@googlegroups.com |
Dear All,
Thanks for the response given to me explaining the root cause of the same.
Could any of you help me in telling how to rectify / salvage the existing shell with the indications at the toes as mentioned below.
Regards,
Raghavendra
Larsen & Toubro Limited
www.larsentoubro.com
This Email may contain confidential or privileged information for the intended recipient (s) If you are not the intended recipient, please do not use or disseminate the information, notify the sender and delete it from your system.
>>> "PEMMARAJU RAGHAVENDRA" <rpe@hzw.ltindia.com> 12/01/2010 09:01 am >>>
Dear All,
I have a typical problem with my vendor who is manufacturing Coke drums for us.
The stage of NDT including RT is such that we need to take RT before PWHT and before overlay.
One of the section ( shell to Shell) under went the above process and cleared. After that it was overlayed by AWS class Inconel E NiCrFe3 electrodes on base plates ( SA387 Gr.11 ClassII) with 410S cladding on either side. Later the same was subjected to Pickling and passivation and went for PWHT.
Now durng APWHT stage, when we are performing PT and RT, surprisingly we are getting two wagon track linear indications on either sides of weld toes from inside ( on cladding side) which are exactly the border junction of ENiCrFe3 inconel and 410S cladding of the shell plates.
It is having a depth of around 0.5mm and width also same.
Could any one explain the cause of formation of this indication at the above juncture. As per our estimation, it could have happend due to pickling and passivation. Since another shell with above processes ( except pickling and passivation ) has not got any such indications.
Thanks for your time and efforts.
Regards,
Raghavendra
Larsen & Toubro Limited
www.larsentoubro.com
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