Welding of Structural Steel SA-36 to pressure parts for a Vessel in Sour Service.
Welding of Structural Steel SA-36 to pressure parts for a Vessel in Sour Service.
(OP)
Hello All,
I am currently reviewing some drawings for a pressure vessel in sour service. The Details are as below:
Design code: ASME section VIII Div. 1
Design pressure : 10 bar
Design Temperature : 150 Deg. C
Corrosion Allowance : 3 mm
MOC : SA 516 Gr. 60
MOC of rungs : SA 36
Service : Sour Service
This vessel has a manhole and internal rungs. The handles welded to the manhole blind flange and the internal rungs welded to the shell directly are of structural grade SA-36 material.
Is this acceptable? Is there anything written in the code ASME Section VIII Div. 1 about this.
I am currently reviewing some drawings for a pressure vessel in sour service. The Details are as below:
Design code: ASME section VIII Div. 1
Design pressure : 10 bar
Design Temperature : 150 Deg. C
Corrosion Allowance : 3 mm
MOC : SA 516 Gr. 60
MOC of rungs : SA 36
Service : Sour Service
This vessel has a manhole and internal rungs. The handles welded to the manhole blind flange and the internal rungs welded to the shell directly are of structural grade SA-36 material.
Is this acceptable? Is there anything written in the code ASME Section VIII Div. 1 about this.





RE: Welding of Structural Steel SA-36 to pressure parts for a Vessel in Sour Service.
Marty
RE: Welding of Structural Steel SA-36 to pressure parts for a Vessel in Sour Service.
Well i did check NACE MR0175/ISO 15156 nothing there.
RE: Welding of Structural Steel SA-36 to pressure parts for a Vessel in Sour Service.
Is what acceptable? Use of A36? Welding to the shell? Welding to the blind flange? Etc. ISO 15156 will only guide you on the particular requirements for the welds and the requirements for the ladder material should it be deemed necessary to avoid H2S damage in the ladder.
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: Welding of Structural Steel SA-36 to pressure parts for a Vessel in Sour Service.
Well I wanted to know if welding structural steel directly to a pressure part is acceptable. Are there any concers if this is done.
Cos generally as a good engineering practice we never weld a structural steel directly to a pressure part, howver in the csae mentioned above this has been done and also the pressure vessel is in Sour service.
RE: Welding of Structural Steel SA-36 to pressure parts for a Vessel in Sour Service.
Here it states that non-pressure parts welded to the shell do not even need to conform to the material specifications permitted by ASME VIII-1, so long as they are of "weldable" quality (discussed in UW-5(b)).
When I first read this, it opened by eyes a little as to why there are so many other grades of steel included in ASME IX, but that are missing from ASME II-D. By excluding materials from ASME II-D, it makes it very difficult for pressure boundary use, however by including them in ASME IX you are provided an easy route to use these materials for non-pressure parts.
RE: Welding of Structural Steel SA-36 to pressure parts for a Vessel in Sour Service.
Also refer to UCS-6(b); SA-36 is not only for structural but also approved for PRESSURE PARTS with limitations.
RE: Welding of Structural Steel SA-36 to pressure parts for a Vessel in Sour Service.
RE: Welding of Structural Steel SA-36 to pressure parts for a Vessel in Sour Service.
RE: Welding of Structural Steel SA-36 to pressure parts for a Vessel in Sour Service.
Given the service, the client specs may have additional requirements like PWHT and/or taking Brinell hardness readings after welding, among others.