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" <materials-welding@googlegroups.com>
Sent: Mon, 10 Oct 2022 08:55:39
To: 'Prabhu kumar Loganathan' via Materials & Welding <materials-welding@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 <materials-welding@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 <vvkeskar123@gmail.com>
Sent: Thu, 06 Oct 2022 09:52:15
To: Materials & Welding <materials-welding@googlegroups.com>
Subject: [MW:33541] HEAT EXCHANGER CONSTRUCTION
Dear Experts
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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 <vvkeskar123@gmail.com>
Sent: Thu, 06 Oct 2022 09:52:15
To: Materials & Welding <materials-welding@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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