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SECTION VIII-1

Subject Interpretation File No.UG-10 (2010 Edition), Recertified Material P-Number ............................... VIII-1-10-35 11-246

UG-20(d) [Division 1 (2010 Edition)] and

4.1.5.2(d)(3) [Division 2 (2010 Edition)] ................................................ VIII-1-10-34 10-1800

UG-27 (2010 Edition) ................................................................................. VIII-1-10-38 10-1670

UHA-34 (2007 Edition, 2009 Addenda) ...................................................... VIII-1-10-37 05-397

UW-13(f), Fig. UW-13.3(b), and Appendix 20,

Hub Design (2010 Edition) ..................................................................... VIII-1-10-36 11-335

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Interpretation: VIII-1-10-34

Subject: UG-20(d) [Division 1 (2010 Edition)] and 4.1.5.2(d)(3) [Division 2 (2010 Edition)]

Date Issued: March 9, 2011

File No.: 10-1800

Question: When heat transfer calculations demonstrate that the temperature of a flange and its bolting is less than

the temperature of the adjacent vessel components, may the flange and bolting be considered as a zone in

accordance with Section VIII, Division 1, UG-20(d), and Section VIII, Division 2, 4.1.5.2(d)(3), which would

 permit a lower design temperature to be used for the flange and bolting than that used for the adjacent components?

Reply: Yes.

 Note: This interpretation also appears as VIII-2-10-05.

Interpretation: VIII-1-10-35

Subject: UG-10 (2010 Edition), Recertified Material P-Number 

Date Issued: March 31, 2011

File No.: 11-246

Question: May a material that was originally identified with a specification not permitted by Section VIII,

Division 1, but was recertified by the vessel manufacturer to a permitted specification in accordance with

UG-10(a)(2), use the same P-Number designation of the permitted specification?

Reply: Yes.

Interpretation: VIII-1-10-36

Subject: UW-13(f), Fig. UW-13.3(b); and Appendix 20, Hub Design (2010 Edition)

Date Issued: April 29, 2011

File No.: 11-335

Question: A hub is machined from a flat plate by machining a groove in the plate such that the end of the hub

does not project beyond the face of the original plate as shown in Fig. UW-13.3(b). Do the requirements of Appendix 20 apply?

Reply: Yes.

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Interpretation: VIII-1-10-37

Subject: UHA-34 (2007 Edition, 2009 Addenda)

Date Issued: May 2, 2011

File No.: 05-397

Question: A vessel is constructed of austenitic chromium–nickel alloy steel, containing longitudinal and

circumferential seam welds that exceed a nominal size of 3/4 in. (19 mm). The welds are 100% radiographed in

accordance with UW-51 and UHA-33. May the radiography be used to substitute for the liquid penetrant

examination required by UHA-34?

Reply: No.

Interpretation: VIII-1-10-38

Subject: UG-27 (2010 Edition)

Date Issued: May 2, 2011

File No.: 10-1670

Question (1): An ellipsoidal head is attached to the outside diameter of a cylindrical shell by a threaded

connection. Does the threaded portion of the shell and head need to meet the wall thickness requirements of 

UG-27(c) and UG-32(d), respectively, as measured to the root of the thread for each component?

Reply (1): Yes.

Question (2): Since Section VIII, Division 1 does not have rules for the design of the threads for the closure

described in Question (1), shall the MAWP of closure assembly be determined in accordance with U-2(g)?

Reply (2): Yes.