NACE SP0472-PWHT - AMINE service

253 views
Skip to first unread message

PSS

unread,
Jan 31, 2021, 10:13:44 PM1/31/21
to Materials & Welding
Experts

Client Requirement : Vessel shall be PWHT. Production Weld deposits hardness shall not exceed 200HBW after PWHT. Carbon steel welds shall comply with NACE STD SP0472 para. 2.2 & 3.3

pgos...@rogers.com

unread,
Jan 31, 2021, 11:45:07 PM1/31/21
to material...@googlegroups.com

Hi,

 

These are very basic requirements for amine service. Typically,  weld hardness of 200HBW maximum  after PWHT is common requirement for amine service. You may find detailed description of the problem and engineering solutions in API RP -945: API RP 945 : Avoiding Environmental Cracking in Amine Units (ihs.com)

 

Thanks.

 

Pradip Goswami.P.Eng, IWE.

Independent  & Consulting Welding & Metallurgical Specialist

Linkedin: https://www.linkedin.com/in/pradip-goswami-2999855/

Email:pgos...@rogers.com,pradip....@gmail.com

Cell/Whasapp:1-905-9793232

--
https://materials-welding.blogspot.com/
https://www.linkedin.com/groups/122787
---
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.
To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/a024d874-aeff-4042-afd5-cf7b8a6e2a62n%40googlegroups.com.


Virus-free. www.avg.com

selastine sudhakar

unread,
Feb 1, 2021, 1:15:40 AM2/1/21
to material...@googlegroups.com
Thank you sir

My clarifications
1) As per NACE SP0472 Table 1 refers amine service  -Hardness  Not applicable with note E& C . But again note C refers -200HBW .

image.png
2) This is a production joint hardness requirement . so  we can use our existing  PQR with 248 Hv for welding .

3) Hardness value 200 BHW means almost 200Hv in vickers. anyway we are going to do PWHT >620 C but is it  easily achievable?. How much hardness value reduction  during PWHT.

4)  we have to take production hardness on weld & HAZ. Is it really possible to take Production on HAZ also.

Regards



                                      

Pankaj Kolhe

unread,
Mar 28, 2021, 8:33:38 AM3/28/21
to materials-welding
Correct,
Refer API RP 945 for amine service.
PWHT is required and hardness control is required.

On Mon, Feb 1, 2021 at 8:43 AM PSS <mechse...@gmail.com> wrote:
Experts

Client Requirement : Vessel shall be PWHT. Production Weld deposits hardness shall not exceed 200HBW after PWHT. Carbon steel welds shall comply with NACE STD SP0472 para. 2.2 & 3.3

--
Reply all
Reply to author
Forward
0 new messages