Deaerator in Sec.I ?

[90harley]

In the HRSG system will the Deaerator located in the LP section above the LP drum commonly fall under the requirements of Section I ? Or will the boundary end with the LP drum and the DA be considered as an attachment?

 

[gr2vessels]

The DA is a pressure vessel in accordance with Section VIII.
Cheers,
gr2vessels

 

[GenB]

it becomes cheaper to built to Sect VIII than I.

 

[90harley]

Thank you for the info.

 

[stanweld]

It really depends on the location and valving. If not isolated outside the ASME I boundary, it will be governed by ASME I. We have seen them designed, manufactured and stamped per ASME I and ASME VIII, Div. 1.

 

[Shmulik]

harley,

I would suggest you go over the following National Board article regarding to deaerator cracking control. There are few most important insights:

http://www.nationalboard.org/Index.aspx?pageID=180

 

[gr2vessels]

Better still, get rid of the DA;- with oxygen controlled injection you have better corrosion control over the whole system and a lot less headaches.