Material Interchangebility 1

[BY11]

Why the material grade SA182 F6NM is not permitted under ASME Sec VIII Div 1 while it is permitted under Sec III. Is it because the material meant for piping component for the use in pressure application and not for pressure vessel purposes such as casings.

I understand the above material is still under review by the code case committe,can we go ahead and use this material for pressure vessel application as it is offered as alternate to A487CA6NM.

The proposed material will be used for pressure casing for the equipment constructed under API 617, the casing will be designed to sec VIII div 1 but withoout stamp.

What is maximum MDMT permitted for the proposed material ( is it -73 Deg C )

App members valuable feedback and time.

regards,

BY11

 

[metengr]

The SA 182 F6NM material for use as forgings in excesws of 10,000 lbs (SA 336) was approved by Section III under a code case. This material is not approved for use by Section VIII, Div 1, and I have not seen any code case or record for code case as of yet on C&S Connect. So, you cannot use SA 182 F6NM for pressure retaining material in a pressure vessel.

 

[BY11]

meteng,

thanks for your feedabck, can you please reconfirm again the following,

can we not use the material even if the vessel is not code stamped

What is maximum allowed (MDMT) temperature limit for the material, our service condition is around -85 Deg C and we have impact test requirements.

 

[metengr]

BY11:
You can select this material for use as long as the item is not code stamped. However, this is not an endorsement for use of this material in your specific application. I would follow the code case requirements set forth by Section III, allowable stress values and design stress intensity values, which may limit this material for use in your design.

The material is limited to a maximum service use temperature of 700 deg F (371 deg C).
The minimum design metal temperature with no impact testing is -20 deg F (-30 deg C).

You will need to determine suitability for service down to -85 deg C with impact testing.