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SECTION VIII-2
Subject Interpretation File No.
AD-912 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VIII-2-04-03 BC04-271
AF-815.1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VIII-2-04-05 BC04-060
AG-121(c) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VIII-2-04-04 BC03-1277
Appendix 4, 4-136.7(a) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VIII-2-04-06 BC03-773
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Interpretation: VIII-2-04-03
Subject: Section VIII, Division 2 (2001 Edition, 2003 Addenda); AD-912
Date Issued: March 22, 2004
File: BC04-271
Question: A vessel head, which is attached to a cylindrical shell of the same thickness, may have a short
cylindrical section beyond the tangent line of the head. In order to comply with the requirements of
AD-912(a) of Section VIII, Division 2 for determining the distance from a lightly loaded attachment to a
gross structural discontinuity, shall the distance limitation be taken from the attachment to the tangent line
of the head and not from the attachment to the head-to-shell weld junction?
Reply: Yes.
Interpretation: VIII-2-04-04
Subject: Section VIII, Divisions 1 and 2; U-1(c)(2)(c) and AG-121(c), Pulp Refiners
Date Issued: April 7, 2004
File: BC03-1277
Question: Is a pressurized pulp refiner exempt from the scope of Section VIII, Division 1 by U-1(c)(2)(c)
and Section VIII, Division 2 by AG-121(c), provided the primary design considerations and/or stresses are
derived from the functional requirements of the device?
Reply: Yes. See U-1(c)(1) and footnote 1 to AG-100.
Note: This interpretation also appears as VIII-1-04-33.
Interpretation: VIII-2-04-05
Subject: Section VIII, Division 2 (2001 Edition, 2003 Addenda); AF-815.1
Date Issued: May 28, 2004
File: BC04-060
Question: During construction of a layered vessel, gaps are found between layers that do not meet the
requirements of AF-815(d) of Section VIII, Division 2. In applying the alternative rules of AF-815.1, the
circumference at the midpoint of each shell course is measured at zero pressure and also at design pressure
following the application of hydrostatic test pressure, to determine the difference in measurements at each
location. Is the average middle circumferential expansion, em, determined by averaging the difference in
measurements from each individual shell course, as opposed to averaging the circumferential measurements
themselves?
Reply: Yes.
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Interpretation: VIII-2-04-06
Subject: Section VIII, Division 2 (2001 Edition, 2002 Addenda); Appendix 4, 4-136.7(a)
Date Issued: June 16, 2004
File: BC03-773
Question: When performing a simplified elastic–plastic analysis in accordance with Appendix 4, 4-136.7
of Section VIII, Division 2, the range of primary plus secondary stress intensity, excluding thermal bending
stresses, is required to be less than or equal to S PS . Does the term “thermal bending stress” include the
bending stress that results from the restraint of differential thermal expansion between adjacent parts, such
as that which occurs at a nozzle-to-shell or shell-to-tubesheet connection when the components are at a
different temperature or have different coefficients of thermal expansion?
Reply: Yes.
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