ASME Section 1 Boiler Superheater Tmin
ASME Section 1 Boiler Superheater Tmin
(OP)
Hi,
I a new to this but I thought I would ask a question.
I am working on calculating the Tmin of a superheater tube bend. I was wondering if I should use the original code of construction or the current edition of the ASME code?
Thanks
I a new to this but I thought I would ask a question.
I am working on calculating the Tmin of a superheater tube bend. I was wondering if I should use the original code of construction or the current edition of the ASME code?
Thanks





RE: ASME Section 1 Boiler Superheater Tmin
RE: ASME Section 1 Boiler Superheater Tmin
RE: ASME Section 1 Boiler Superheater Tmin
RE: ASME Section 1 Boiler Superheater Tmin
RE: ASME Section 1 Boiler Superheater Tmin
Where does ASME section 1 allow you to use a more current code for allowable stress values?
Thanks
RE: ASME Section 1 Boiler Superheater Tmin
For in-service components, the NBIC or API codes and standards are used for inspection, repair and alteration activities. The NBIC and API refer you to a construction code for specific requirements related to design calcs, NDT requirements and allowable stress values.
Since construciton codes, like ASME B&PV Code, Section I, are updated, one should be aware that the year and addenda selected for stress values should be the one to provide the most conservative or safest approach. So, you do not have to go back to the specific year and addendum for a construction code.
RE: ASME Section 1 Boiler Superheater Tmin
SA-516 Gr 70 pre-1999 17.5 kips at 600°F
SA-516 Gr 70 today 20 kips at 600°F
RE: ASME Section 1 Boiler Superheater Tmin
Once again, I will repeat, original code of construction means code of construction used in design. It is up to the owner/user and repair organization to determine, which addition and addendum they would use. In some cases, a repair can become an alteration. I don;t know where this information originated with having to be locked into a specific year and addendum.
RE: ASME Section 1 Boiler Superheater Tmin
Subject: RC-1000 General Requirements
1995 Edition
Question: When the NBIC references "the original code of construction," is it
required to use the edition and addenda of that code as used for
construction?
Reply: No. The term "original code of construction" refers to the document itself,
not the edition/addenda of the document. Repairs and alterations may be
performed to the edition/addenda used for the original construction or a
later edition/addenda most applicable to the work.
RE: ASME Section 1 Boiler Superheater Tmin
RE: ASME Section 1 Boiler Superheater Tmin
Your in-service inspection, repair and alteration code for boilers is the National Board Inspection Code (NBIC). Are you familiar with this document? Do you have a copy of this document? I can tell you are new because of the continued questions surrounding ASME and it's application.
Please contact the National Board at the web site below and talk to one of their staff engineers. They will provide assistance over the phone versus the internet. You need more help than I can provide in writing.
You will use ASME Section I formula to calculate a Tmin to compare with the thickness you measured on an actual boiler tube. The Edition and addendum for this calculation can be what is most applicable to your situation. Do you understand this?
Once you have calculated T min using Section I and compared with your measured thickness in service, here are your options plain and simple - weld build-up to restore the eroded/corroded wall back to the calculated T min or replace the tube.
If you want to perform a fitness for service, this is more complex and well over your head. The document for this is ASME/API FFS-1.
http://www.nationalboard.org/default.aspx
RE: ASME Section 1 Boiler Superheater Tmin
There is every one looking for Earlier versions Ed & Add's of the ASME Code
and at the end it was not necessary.
and that is because of the miss-interpretation of the NBIC.
RE: ASME Section 1 Boiler Superheater Tmin
I recall that for several years there was a debate regarding the required wall thickness at the extrados of bent tubing , and that the older section I code did not provide an easy out for the boiler mfr . Use of torroidal equations , plus credit for work hardening, normally shows that some wall thinning should be acceptable at the extrados, but many clients are not convinced.
Also, although it might not yet apply to section I, other codes have been revised in the last 10 yrs to both increase the allowable stress of some alloys plus lower the hyddrotest pressure. For theose codes, the 2 are interrelated, and it might not be appropriate to use the newer stresses plus to continue to use the older hydrotest value.