Re: [MW:33590] HEAT EXCHANGER CONSTRUCTION

Thanks  a lot !!

What is recommended distance of Lip  that is required  for  avoiding the exposure of heat ?

On Tuesday, October 11, 2022 at 8:54:43 AM UTC+5:30 gerry_tup wrote:

sorry for being out of track.

I believe the welding between Tube sheet and Shell/Channel via a LIP provided in the TS forging where you can excercise a control.

Ensure DSS is not exposed to temperature greater than 400 degC to avoid 475 embrittlement (alpha prime intermetallic)

Thanks & Regards

J.Gerald Jayakumar

On Monday, 10 October, 2022 at 12:55:58 pm GMT+4, Vishwas Keskar Welding Manager WELDING <vvkes...@gmail.com> wrote:

Pl. note that all the HEX Tubes are also of DSS TYP S32205 .

  So  the concerned is for these DSS tubes also.

On Monday, October 10, 2022 at 11:38:58 AM UTC+5:30 gerry_tup wrote:

Thanks Prabhu.

Is SCC in chloride environment  a problem with SASS & 625.

Moreover SASS are available mostly in European market.

Thanks & Regards

J.Gerald Jayakumar

On Monday, 10 October, 2022 at 09:37:06 am GMT+4, 'Prabhu kumar Loganathan' via Materials & Welding <material...@googlegroups.com> wrote:

Hello Gerald,

Yes, below specified Super ASS is an alternate to DSS due to high Cl environment, however market availability is very less which leads to long delivery time and hence suggested to go for Inconel 825 or 625, again Alloy 825 weld deposition is having cracking issues >5mm thick which is not recommended.

Regards,
L. Prabhu kumar



From: "\'james gerald\' via Materials & Welding" <material...@googlegroups.com>
Sent: Mon, 10 Oct 2022 08:55:39
To: 'Prabhu kumar Loganathan' via Materials & Welding <material...@googlegroups.com>
Subject: Re: [MW:33563] HEAT EXCHANGER CONSTRUCTION
 

Nice to see you back Prabhu.

 

If service restrictions are only due to chloride concentration then we try the SASS like 904L, 254 SMO & 654 SMO/

 

Your views

 

Thanks & Regards

J.Gerald Jayakumar

 

 

 

On Friday, 7 October, 2022 at 07:33:25 am GMT+4, 'Prabhu kumar Loganathan' via Materials & Welding <material...@googlegroups.com> wrote:

 

 

Hi,
In general, DSS weld overlay is not recommended in CS due to cracking and other weldability issues. Moreover, Tube sheet forging with heavy weld overlay requires stress relieving too. 
However, stress relieving is not recommended for DSS, Hence in my opinion DSS weld overlay on TS to be replaced with Alloy 625 weld overlay wherein all these these issues related to weldability & PWHT will be solved.
Regards,
Prabhu.





From: Vishwas Keskar Welding Manager WELDING <vvkes...@gmail.com>
Sent: Thu, 06 Oct 2022 09:52:15
To: Materials & Welding <material...@googlegroups.com>
Subject: [MW:33541] HEAT EXCHANGER CONSTRUCTION

Dear Experts 

One of HEX involves  following MOCs -

HEX tubes - SA 789 TYP 32205 

Tubesheet -SA 266 CL 2 CS - Tube sheet IS cladded with TYP S32205  overlay.

Shell side - CS -SA 516 GR 70 - 75mm thk 

Channel side - CS- SA 516 GR 70 - 75 mm thk 

PWHT is required for  Tube sheet to Shell welding and Tube sheet to Channel welding. These are butt welds with CS Weld metal .

PWHT is not required for  Tube sheet to HEX Tube  welding due to DSS tube to DSS cladding.

 

Pl advice for the  care that shall be taken during PWHT  of Tube sheet to Shell welding and Tube sheet to Channel welding.

 

Thanks and regards

Vishwas - IWE

International Welding Engineer

 

 

 

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