bpvc-viii-2 interpretação vol.55 2004

7/28/2019 BPVC-VIII-2 Interpretação Vol.55 2004

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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



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.


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.


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.




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.

bpvc-viii-2 interpretação vol.55 2004

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