ASME Section II Part D Table 1A note G4 interpretation 2

[Trebormech]

Hello, fellow engineers.

Regarding note G4 in ASME Section II, Part D, Table 1A, could somebody please tell me what the phrase "are enclosed within a setting" means?

Thank you.

Trebormech

 

[MrBTU]

Trebormech,
You may have uncovered a typo - they may have meant to say "are enclosed within a shell" since they allow higher allowable stresses, and they're referring to Sect 1 applications.

 

[Trebormech]

Thank you MrBTU.

So, would you consider tubes that are within the casing of a boiler, such as a gen bank tube, to be "within a shell"?

Gen bank tubes are certainly a Section I application, but I am wondering if this implies some additional form of restraint or enclosure (like refractory).

What you suggest makes sense though.

Thanks.

Trebormech

 

[SnTMan]

G4, last sentence about the joint efficiency factor is a little puzzling to me. Is is one below 850? If not, must another value be applied?

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[Trebormech]

Does anyone else have some insight into what the phrase "are enclosed within a setting" means in note G4 of Section II, table 1A?

Thank you.

 

[Transferer]

API 560 Defines "setting" as "Heater casing, brickwork, refractory, and insulation, including the tie-backs." Some of the references to setting in Sect. I also imply that it is the external walls or enclosure of a boiler.