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Interpretation: VIII-79-04

Subject: Section VIII, Division 1, UG-11, Weld Caps

Date Issued: January 4, 1979

File: BC78-745

Question: May weld caps, as called out in UG-11(a)(1), produced per SA-234 or SA-403 andmarked in accordance with UG-93 and UG-94 and complying with ANSI B16.9 be used as a formed end

closure head on a pressure vessel?

Reply: The Preface of Material Specifications SA-234 arid SA-403 outline that these materials

are intended for Section III construction. They are not intended for Section VIII construction. It is

suggested that ASTM Standards A403 and A234 could be used and would meet the intent of UG-11(a)(1)

of Section VIII, Division 1.

Interpretation: VIII-79-05

Subject: Section VIII, Divisions 1 and 2, UG-120(c), UG-116(i), AS-120, and AS-310; Partial

Data Reports

Date Issued: January 5, 1979

File: BC78-749

Question (1): A vessel Manufacturer at site "A" receives fabricated parts from his facility at site "B".

Under these conditions may these parts be furnished without parts stamping of Partial Data Reports U-2

or A-2 under the provisions of Section VIII, Divisions 1 and 2?

Reply (1): Yes, provided the Quality Control System of the vessel Manufacturer outlines the

method of control, including applicable documentation and procedure, to be used to produce the vessel

and the Manufacturer does have a contract with the same inspection agency at Location A and B.

Question (2). May the Partial Data Report U-2 or A-2 Form be used under Section VIII, Divisions 1

and 2 to document more than one part to be incorporated into a vessel?

Reply (2): Section VIII, Divisions 1 and 2 do not prohibit the documentation of more than one part

on a Partial Data Report U-2 or A-2 Form.

Interpretation: VIII-79-06

Subject: Section VIII, Division 1, Table UNF-23.3; Maximum Allowable Stress Values in

Tension for Nonferrous Boltings

Date Issued: January 9, 1979

File: BC78-734

Question: In general, allowable stress values for bolting, are lower than those for plates, pipe, and

tubes, or rods and bars of same materials. Maximum allowable stress values in tension for high nickel

boltings have been revised in Table UNF-23. May we assume that the reason why these revisions have

been made although material specifications have not been revised, is reliable technical data on these

materials have been developed and come to be available after previous issuance of the Code?

Reply: The requirements of Appendix P, UA-500(4)(b) of Section VIII, Division 1 explains the

reasoning for the stress criteria in Table UNF-23 for bolting material. Note that the higher stress values