PWHT for Heat exchanger

[Rajesh]

Dear All,

We are constructing an heat exchanger which has fixed tubesheet welded to shell.

Shell Material SA 516 Gr 70
Tube Material - Cu Ni 90:10
Tubesheet - SA 266 claded with CU Ni 90:10

Customer is demanding PWHT for complete heat exchanger due to process. But we have fear for failure of tube bundle after PWHT due to differential thermal expansion.

Please comment if CODE has any reference to this?

Rajesh

[Shashank Vagal]

Dear Rajesh,

Please consider slow heating / cooling cycles.

 

With Best Regards,

Shashank C Vagal

--
To post to this group, send email to material...@googlegroups.com
To unsubscribe from this group, send email to materials-weld...@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
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-weld...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

[Prakash Hegde]

Hi!

What is the T/Tsht joint constrction Whether it is expanded or Strength weld joint ?

ii)Why do you want to heat treat Whole Eqpt ? Does CS Gr 70 shell thk is more than 38mm thk if not

ii) You can get approval for T/tsht weld joint for Local SR by electrical heating

iii) As per ASME code Sec VIII Div 1 You can reduce the PWHT soaking temp with increasing soaking time  Refer code UCS 56

Regards

Hegde P.B.

 

On Monday, 19 May 2014 4:15 AM, Rajesh <mrinm...@gmail.com> wrote:

[prabhavathi]

Dear Mr.Rajesh,

The fixed tubesheet exchanger to be heat treated before putting tubes  in bundle. ( Rest all the activities to be completed). When heat treating some bare CS tubes can be inserted peripherally with rods inside and  bolted at the ends to prevent any distortion.  Then if required tube to tube sheet welding is to be locally  heat treated.

Regards
UP

-- 
{\rtf1\ansi\ansicpg1252\deff0\deflang1033{\fonttbl{\f0\fswiss Helv;}{\f1\fswiss\fcharset0 Arial;}}
{\colortbl ;\red0\green0\blue0;}
{\*\generator Msftedit 5.41.15.1515;}\viewkind4\uc1\pard\sl240\slmult1\cf1\f0\fs20 Regards,\line\line\line U.Prabhavathi\line Sr.Manager - Engineering\line Universal Heat Exchangers Ltd\line Malumachampatti Post\line Coimbatore -  641 050\line\line Mobile: 093632 00607\line Email: prabh...@uniheat.com\line\line Tel: 91-422-2610 835 / 836\line\pard Fax: 91-422-2610 746 / 532 \cf0\f1\par
}