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
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
On 19-May-14 8:15 AM, 'Prakash Hegde' via Materials & Welding wrote:
--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 notii) You can get approval for T/tsht weld joint for Local SR by electrical heatingiii) As per ASME code Sec VIII Div 1 You can reduce the PWHT soaking temp with increasing soaking time Refer code UCS 56RegardsHegde P.B.On Monday, 19 May 2014 4:15 AM, Rajesh <mrinmeghnsk@gmail.com> wrote:
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
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