Flange Rating for SS316 and SS316L

[Steve.sw90]

For coded vessel can i use SA-182 F316 for design calculation and SA-182 F316L for other documentation.
does code restrict from doing as mentioned above, please provide refference

 

[marty007]

See ASME IID Appendix 7, paragraph 7-240:

If a material is marked with specifications, grades, classes, or types, it may be used with the allowable stresses, design stress intensities, or ratings appropriate for any of the markings on the material, as long as the material specification, grade, class, and type is permitted by the code of construction governing the boiler, vessel, or component in which the material is to be used. However, once the designer has selected which marking applies (specification, grade, class, type, etc.), the designer must use all the design values appropriate for that selection and may not mix and match values from any other specifications, grades, classes, types, etc., with which the material may be marked.

This paragraph is copied in ASME IIA Appendix III, paragraph III-240.

In short, you have to choose one, and be consistent throughout your calculations/drawings/etc... No mixing and matching.

 

[JStephen]

A lot of the 304L or 316L is dual-certified as 304/304L or 316/316L, and that's what the paragraph above is addressing.
If you have 304L that is NOT dual certified as 304, it likely has lower yield strength than the 304, and shouldn't be interchanged on that account, among others.

 

[Steve.sw90]

Thank you for all responses

 

[Christine74]

If the material is 316/316L dual certified, you can use the higher allowable stress 316 material as the basis for your calculations, but you have to list 316 material on your Manufacturer's Data Report. In the "Remarks" section you can mention that the material also satisfies the material properties requirements of 316L grade material.


-Christine

 

[Christine74]

Here's the Interpretation:

https://cstools.asme.org/Interpretation/InterpretationDetail.cfm?TrackingNumber=8492

 

[Steve.sw90]

Thanx Christine

 

[viper3982]

In addition to Christine's comments:

The B16.5 2.9 states “Material for flanges and flanged fittings may meet the requirements of more than one specification or the requirements of more than one grade of a specification listed in Table 1A. In either case, the pressure-temperature ratings for any of these specifications or grades may be used provided the material is marked in accordance with para. 4.2.8.”

Keep in mind that 316 has the note that: 'At temperatures over 1,000F, use only when the carbon content is 0.04% or higher, where 316L does not have this requirement.