Re: [MW:25230] Reg. post heating for low alloy steels

Mr lintas , preheat maintenance is a non essential variable as per QW 250

On 08-Aug-2016 5:43 pm, "George Dilintas" <dilintas@gmail.com> wrote:

correct it is not the same, but the only way to handle post heating in the frame of the ASME Code is to handle it as preheat maintenance. Remember that it is a supplementary essential variable

2016-08-07 15:08 GMT+03:00 Kannayeram Gnanapandithan <kgpandithan@gmail.com>:

Preheat maintenance is slightly different from post heating( dehydration, hydrogen bake out). Preheat maintenance is a non essential variable. Post heating is generally good for lowalloy/Cr-Mo steel to avoid HICC.

On 07-Aug-2016 3:40 pm, "George Dilintas" <dilintas@gmail.com> wrote:

In the BPVC ASME Section IX there is a variable "Preheat Maintenance". This is the variable which applies in your case. It is up to you do define the value. The issue is that this variable is a supplementary essential one, i.e when impact test is required, then the PQR has to be qualified with this variable. If the value of temperature is reduced then a new PQR is necessary.

PWHT is possible after welding if you dont remove insulation and you raise the temperature as per B31.3 requirements 331.1.4

2016-08-07 5:33 GMT+03:00 Prasu Cutie <pracuty@gmail.com>:

Dear experts,
We are going to start pqr for low alloy steels i.e. A335 Gr P11, P22, P5, P91 etc, it suppose to be post weld heat treated immediately  after welding. As per literature if pwht is not possible immediately  after welding, intermediate PWHT recommende .i.e pos heating.
Now the question is is there any code reference for the same? What is the heating time n temp???
The codes we r following  here are shell dep's n asme b 31.3
Project: refinery

Awaiting for your reply

Thanks n regards
Prasad
0096594122634

--
http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
To post to this group, send email to materials-welding@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CAKgcArQMULX%3DQgcoXb8CgGM%3DmHiLQZG50iXgWuCR146W_HjO_g%40mail.gmail.com.
For more options, visit https://groups.google.com/d/optout.

--

Dr. Georgios Dilintas,

Dipl. Ing. In Aeronautic and Space Engineering

Ph.D in Mechanics of Solids - Computational Mechanics

A.I.S, A.N.I, IRCA Lead Auditor

Welding, Stress Analysis, Corrosion, QA/QC, Failure Analysis, Risk Analysis

--
http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
To post to this group, send email to materials-welding@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CAPOi40DHhhM8FHP7VbPzhtqBpPwHVh8BTJMb%2BVAuQ%2BXOiYEJgw%40mail.gmail.com.
For more options, visit https://groups.google.com/d/optout.

--
http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
To post to this group, send email to materials-welding@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CAJzm4eM6GBWazBdjfHZ25B_cEWsK4cxRQA_o8fnXOH1g1x3wBA%40mail.gmail.com.
For more options, visit https://groups.google.com/d/optout.

--

Dr. Georgios Dilintas,

Dipl. Ing. In Aeronautic and Space Engineering

Ph.D in Mechanics of Solids - Computational Mechanics

A.I.S, A.N.I, IRCA Lead Auditor

Welding, Stress Analysis, Corrosion, QA/QC, Failure Analysis, Risk Analysis

--
http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
To post to this group, send email to materials-welding@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CAPOi40BAji%2ByncfvWDMOUqZmJthYMrYHEBY7eEOJbL_XZ6VtOQ%40mail.gmail.com.
For more options, visit https://groups.google.com/d/optout.

--
http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
To post to this group, send email to materials-welding@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CAJzm4eO9Tr6_ttwfNNgtR1o2uQD3itLo%2BH8T3mo9NSCrRpZX2w%40mail.gmail.com.
For more options, visit https://groups.google.com/d/optout.