AN INTERNA TIONAL C ODE

2007 ASME Boiler & Pressure Vessel Code

2008a Addenda July 1, 2008

I

RULES FOR CONSTRUCTION OF POWER BOILERS

ASME Boiler and Pressure Vessel Committee

Subcommittee on Power Boilers

Date of Issuance: July 1, 2008

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Library of Congress Catalog Card Number: 56-3934 Printed in the United States of America

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Copyright © 2008 by

THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS

All rights reserved

2007 ASME

BOILER AND PRESSURE VESSEL CODE

SECTIONS

I Rules for Construction of Power Boilers II Materials

Part A — Ferrous Material Specifications Part B — Nonferrous Material Specifications

Part C — Specifications for Welding Rods, Electrodes, and Filler Metals Part D — Properties (Customary)

Part D — Properties (Metric)

1. Rules for Construction of Nuclear Facility Components

   Subsection NCA — General Requirements for Division 1 and Division 2 Division 1

   Subsection NB — Class 1 Components Subsection NC — Class 2 Components Subsection ND — Class 3 Components Subsection NE — Class MC Components Subsection NF — Supports

   Subsection NG — Core Support Structures

   Subsection NH — Class 1 Components in Elevated Temperature Service Appendices

   Division 2 — Code for Concrete Containments

   Division 3 — Containments for Transportation and Storage of Spent Nuclear Fuel and High Level Radioactive Material and Waste

2. Rules for Construction of Heating Boilers V Nondestructive Examination

VI Recommended Rules for the Care and Operation of Heating Boilers VII Recommended Guidelines for the Care of Power Boilers

VIII Rules for Construction of Pressure Vessels Division 1

Division 2 — Alternative Rules

Division 3 — Alternative Rules for Construction of High Pressure Vessels IX Welding and Brazing Qualifications

1. Fiber-Reinforced Plastic Pressure Vessels

2. Rules for Inservice Inspection of Nuclear Power Plant Components XII Rules for Construction and Continued Service of Transport Tanks

iii

ADDENDA

Colored-sheet Addenda, which include additions and revisions to individual Sections of the Code, are published annually and will be sent automatically to purchasers of the applicable Sections up to the publication of the 2010 Code. The 2007 Code is available only in the loose-leaf format; accordingly, the Addenda will be issued in the loose-leaf, replacement-page format.

INTERPRETATIONS

ASME issues written replies to inquiries concerning interpretation of technical aspects of the Code. The Inter- pretations for each individual Section will be published separately and will be included as part of the update service to that Section. Interpretations of Section III, Divisions 1 and 2, will be included with the update service to Subsec- tion NCA.

Interpretations of the Code are distributed annually in July with the issuance of the edition and subse- quent addenda. Interpretations posted in January at www.cstools.asme.org/interpretations are included in the July distribution.

CODE CASES

The Boiler and Pressure Vessel Committee meets regu- larly to consider proposed additions and revisions to the Code and to formulate Cases to clarify the intent of existing requirements or provide, when the need is urgent, rules for materials or constructions not covered by existing Code rules. Those Cases that have been adopted will appear in the appropriate 2007 Code Cases book: “Boilers and Pressure Vessels” and “Nuclear Components.” Supple- ments will be sent automatically to the purchasers of the Code Cases books up to the publication of the 2010 Code.

iv

SUMMARY OF CHANGES

Addenda to the 2007 Edition of the Code are issued in the form of replacement pages. Revisions, additions, or deletions are incorporated directly into the affected pages. It is advisable, however, that all replaced pages be retained for reference.

Replace or insert the pages listed. Changes given below are identified on the pages by a margin note, A08, placed next to the affected area. Revisions to the 2007 Edition are indicated by 07. For the listing below, the Page references the affected area. A margin note, A08, placed next to the heading indicates Location. Revisions are listed under Change.

The Record Numbers listed below are explained in more detail in “List of Changes in Record Number Order” following the Summary of Changes.

(07-1670)

PG-29.11 Variable w added to equation and nomenclature

(07-1670)

errata (07-1302)

1. Table PW-39 (1) Third column revised (06-1589)

   1. General Note (a)(6) corrected by errata (07-1532)

   2. General Note (a)(8)(c)(3) redesignated to (a)(9) by errata (07-1302)

      
      

2. Table PW-39 (1) Third and fourth columns revised (06-1589)

   1. General Note (a)(6)(e) redesignated to (a)(7) by errata

      (07-1302)

   2. General Note (a)(8) added (07-466)

      
      

3. Table PW-39 (1) Third and fourth columns revised (06-1589)

   1. General Note (d) added (07-466)

      
      

4. Table PW-39 (1) Fourth column revised (06-1589)

   1. General Note (b) added (07-466)

   2. Last sentence added to Note (4)(d) (07-1267)

      
      

5. Table PW-39 Third and fourth columns revised (06-1589)

   
   

6. Table PW-39 (1) Third and fourth columns revised

   1. First parenthetical temperature revised in General Note (a) (06-1589)

      
      

7. Table PW-39 (1) Third, fourth, and fifth columns revised

   1. First parenthetical temperature revised in General Note (06-1589)

Page Location Change (Record Number)

1. Table A-360 (1) The first two publications under ASNT Specification

   revised (06-12)

   (2) Note (1) deleted, and subsequent notes renumbered

   (07-105)

2. Form A-370 Number 2 added under “E” Code Symbol Stamp

(07-1300)

NOTE:

Volume 58 of the Interpretations to Section I of the ASME Boiler and Pressure Vessel Code follows the last page of this Addenda.

(e)

LIST OF CHANGES IN RECORD NUMBER ORDER

Record Number Change

01-416 Revised PG-9.2, PG-27.4, and Note (6) to incorporate UNS N06625 material for steam service. 02-2580 Revised definition of “tf” and “th” in PG-32.1.2 and definition of “t” in PG-32.1.2.

03-425 Revised PG-9.2; PG-27.4, Note (6); and Table PG-19 to incorporate Code Case 2226-2.

04-1627 Revised PG-9-4, PG-27.2.1, PG-27.2.1.1, PG-27.2.1.2, PG-27.2.1.5, and PG-27.3, and added Note (11) to

PG-27.4 and PW-44 to permit inclusion of clad thickness in the calculated strength of boiler tubes.

06-12 Revised Table A-360 to indicate adoption of SNT-TC-1A-2006 and CP-189-2006.

06-127 (a) Revised the text of PG-60.1 to preclude designs incorporating cross-webbed construction and better describe the requirements for gage glass designs incorporating multiple sections, as well as the conditions that will allow ommitting overlapping of the adjacent sections.

(b) Inserted new footnote for PG-60.1, and renumbered the existing footnotes.

06-567 (a) Revised PG-68.1 to clarify that the location rules of PG-68.3 and mounting rules of PG-71 apply to safety relief valves for separately fired superheaters.

(b) Issued intent interpretation.

06-1082 Added new paragraph PG-5.6 to provide guidance on the necessary actions, if during any phase of construc- tion or erection, a component is heated to a temperature greater than 1,470°F (800°C).

06-1589 (a) Cooling rate “60°C/hr” in Table PW-39, Note (1) for P-No. 7 and 10I revised to “55°C/hr.”

(b) Minimum holding time “2 min/mm” in Table PW-39 for P-Nos. 1, 3, 4, 5A, 5B (Group Nos. 1 and 2) , 6, 7, and 10I revised to “1 hr/25 mm.”

07-50 Deleted PG-27.4, Note (3)(d), and revised the “Value of C” table in PG-27.4, Note (3) so that it pertains to threaded sections or pipe.

07-105 Deleted Note (1) in Table A-360.

07-306 Editorially corrected PG-67, Note (19).

07-334 Added PG-2.4 to clarify service limitations as applied to thermal fluid heaters.

07-466 Incorporated Code Case 2578 by revising Tables PW-39, P-No. 4, P-No. 5A, and P-No. 5B materials to include the exemption of PWHT for attaching bare thermocouple wire by CDW and ERW.

07-518 Revised PG-67.3 to clarify the set pressure of Economizer Safety Relief Devices. 07-714 Fig. PG-52.1 corrected by errata.

07-1267 Added Note (4)(d) of Table PW-39 for P-No. 5B, Group No. 2 materials to direct the user to document the use of Note (4)(d) on the Manufacturer’s Data Report.

07-1300 Revised A-370 Guide to Information Appearing on Certificate of Authorization for “E” code symbol stamp to cover design and assembly of electric boilers at the location shown on the certificate of authorization and field sites controlled by the location.

07-1302 Revised Table PW-39 for P-No.1, P-No.3, and P-No.4 to correctly format the listed conditions for exemp- tion from PWHT requirements for stud welding of nonload-carrying studs.

07-1532 Table PW-39 corrected by errata.

07-1670 Added para. PG-26 and Table PG-26 to impose weld joint strength reduction factors on certain welds, pri- marily longitudinal and spiral, designed for service in the creep regime. New factor “w” was incorporated into equations in PG-27 (cylindrical components), PG-29 (heads), A-125 (thick-wall cylinder formula), and A-317 (alternative equation for cylinders under internal pressure).

07-1744 Corrected Footnote 8 reference to Appendix A-370. 07-1775 Revised PHRSG-4(b), and added Table PHRSG-4. 07-1776 Added HRSG to the list of devices in the Preamble.

07-1816 (a) In PG-60.1.6, added reference to PG-60.3.7(a) through (e) where examples on acceptable “flow through” valve construction are listed.

1. In PG-60.3.7, added (e) defining the acceptable “Y Pattern” globe valve construction, including printing the figure used in B31.1 as new Fig. PG-60.3.7.

2. Redesignated Fig. PG-60 as Fig. PG-60.3.9, and corrected the reference to that figure in PG-60.3.9. 08-115 Paras. PG-32, PG-67, and PG-68 corrected by errata.

(f)

CONTENTS

Foreword ............................................................................... xv

Statements of Policy xvii

Personnel .............................................................................. xix

Preamble xxxi

Summary of Changes xxxiii

List of Changes in BC Order xxxvi