1、2017 National Board Digital Library “Single User” Instructional License AgreementCarefully read the following terms and conditions before using the pdf fileCOPYRIGHT the National Board has licensed this copy to you for the use described herein. This pdf file is licensed for use by a single user. “Us
2、e” means loaded in temporary memory or permanent storage on the computer. The National Board reserves all rights not expressly granted to you.I understand that I am being provided a pdf file containing the 2017 NBIC in consideration of my representation and/or agreement that: I may photocopy the con
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4、nic download, file sharing or for any other copying means. I understand that any unauthorized duplication of the NBIC through my actions, either deliberate or unintentional, directly or indirectly, may also subject me to a claim of copyright infringement. I further understand that any attempt to ele
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7、ng the software to achieve your intended results, and for the use and results obtained from the software.LIMITATION OF REMEDIESIn no event will the National Board be liable to you for any damages, including any lost profits, lost savings, or any other incidental or consequential damages arising from
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9、y to you.GENERALThis Agreement will be governed by the laws of the state of Ohio.Should you have any questions concerning this Agreement, you may contact the National Board by writing to The National Board of Boiler and Pressure Vessel Inspectors, 1055 Crupper Avenue, Columbus, Ohio 43229-1183.I2017
10、NB-23NATIONAL BOARD INSPECTION CODE 2017 EDITION DATE OF ISSUE JULY 1, 2017This code was developed under procedures accredited as meeting the criteria for American National Stan-dards. The Consensus Committee that approved the code was balanced to ensure that individuals from com-petent and concerne
11、d interests had an opportunity to participate. The proposed code was made available for public review and comment, which provided an opportunity for additional public input from industry, academia, regulatory and jurisdictional agencies, and the public-at-large.The National Board does not “approve,”
12、 “rate,” or “endorse” any item, construction, proprietary device, or activity. The National Board does not take any position with respect to the validity of any patent rights asserted in connection with any items mentioned in this document, and does not undertake to insure anyone utilizing a standar
13、d against liability for infringement of any applicable Letters Patent, nor assume any such liability. Us-ers of a code are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, is entirely their own responsibility. Participation
14、by federal agency representative(s) or person(s) affiliated with industry is not to be interpreted as government or industry endorsement of this code. The National Board accepts responsibility for only those interpretations issued in accordance with governing National Board procedures and policies t
15、hat preclude the issuance of interpretations by individual committee members. The footnotes in this document are part of this American National Standard.RRNRRR The above National Board symbols are registered with the US Patent Office. “National Board” is the abbreviation for The National Board of Bo
16、iler and Pressure Vessel Inspectors. No part of this document may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher.All charts, graphs, tables, and other criteria that have been reprinted from the ASME Boiler and Pressure
17、 Vessel Code, Sections I, IV, VIII, and X are used with the permission of the American Society of Mechanical Engineers. All Rights Reserved.Library of Congress Catalog Card No. 52-44738 Printed in the United States of America All Rights Reservedwww.nationalboard.orgCopyright 2017 byTHE NATIONAL BOAR
18、D OF BOILER Part 2, Inspection; and Part 3, Repairs and Alterations.The NBIC Committees function is to establish rules of safety governing post-construction activities for the installation, inspection, and repair and alteration of pressure-retaining items, and to interpret these rules when questions
19、 arise regarding their intent. In formulating the rules, the NBIC Committee considers the needs and concerns of individuals and organizations involved in the safety of pressure-retaining items. The objective of the rules is to afford reasonably certain protection of life and property, so as to give
20、a reasonably long, safe period of usefulness. Advancements in design and material and the evidence of experience are recognized.The rules established by the NBIC Committee are not to be interpreted as approving, recommending, or en-dorsing any proprietary or specific design, or as limiting in any wa
21、y an organizations freedom to choose any method that conforms to the NBIC rules.The NBIC Committee meets regularly to consider revisions of existing rules, formulation of new rules, and respond to requests for interpretations. Requests for interpretation must be addressed to the NBIC Secretary in wr
22、iting and must give full particulars in order to receive Committee consideration and a written reply. Pro-posed revisions to the code resulting from inquiries will be presented to the NBIC Committee for appropriate action.Proposed revisions to the code approved by the NBIC Committee are submitted to
23、 the American National Standards Institute and published on the National Board web-site to invite comments from all interested per-sons. After the allotted time for public review and final approval, the new edition is published. The Foreword, Introduction, Personnel and Index Sections of the NBIC ar
24、e provided for guidance and informational purposes only and shall not be considered a part of the Code. Theses sections are not approved by the NBIC Commit-tee or submitted to the American National Standards Institute.Organizations or users of pressure-retaining items are cautioned against making us
25、e of revisions that are less restrictive than former requirements without having assurance that they have been accepted by the Jurisdic-tion where the pressure-retaining item is installed.The general philosophy underlying the NBIC is to parallel those provisions of the original code of construc-tion
26、, as they can be applied to post-construction activities. The NBIC does not contain rules to cover all details of post-construction activities. Where complete details are not given, it is intended that individuals or organizations, subject to the acceptance of the Inspector and Jurisdiction when app
27、licable, provide details XINB-23 2017FOREWARDfor post-construction activities that will be as safe as otherwise provided by the rules in the original code of construction.Activities not conforming to the rules of the original code of construction or the NBIC must receive specific approval from the J
28、urisdiction, who may establish requirements for design, construction, inspection, testing, and documentation.There are instances where the NBIC serves to warn against pitfalls; but the code is not a handbook, and can-not substitute for education, experience, and sound engineering judgment. It is int
29、ended that this edition of the NBIC not be retroactive. Unless the Jurisdiction imposes the use of an earlier edition, the latest effective edition is the governing document.XIINATIONAL BOARD INSPECTION CODE2017PERSONNELPERSONNEL The National Board of Boiler and Pressure Vessel Inspectors Board of T
30、rusteesJ. Burpee ChairmanJ. Amato First Vice ChairmanD. Cook Second Vice ChairmanC. Cantrell Member at LargeE. Creaser Member at LargeA. Oda Member at LargeM. Washington Member at LargeD. Douin Secretary/TreasurerAdvisory CommitteeJ. Pillow Representing welding industriesC. Hopkins Representing Nati
31、onal Board stamp holders H. Richards Representing boiler and pressure vessel usersB. Berquist Representing pressure vessel manufacturersR. Wielgoszinski Representing authorized inspection agencies (insurance companies)P. Molvie Representing boiler manufacturersXIII2017PERSONNELNB-23National Board Me
32、mbersAlabama Marvin ByrumAlaska Kenneth LaneArizona Randall AustinArkansasDennis HannonCalifornia .Donald CookColorado . Steve NelsonDelaware .John EschFlorida . Andrew FrazierGeorgia Benjamin CrawfordHawaii Julius Dacanay Illinois. Michael VogelIndiana . Larry ParkeyKansas.Robert StimsonKentucky .M
33、ark JordanLouisiana .Joseph LeSageMaine . John BurpeeMaryland Karl KraftMassachusetts. Edward KawaMichigan David StenroseMinnesota .Joel AmatoMississippi William AndersonMissouri .Ronald Brockman Nebraska . Christopher B. CantrellNevada . David SandfossNew Hampshire Darrell MalloryNew Jersey . Milto
34、n WashingtonNew York .Matthew SansoneNorth Carolina Clifford DautrichNorth Dakota Trevor SeimeOhio . John SharierOklahoma Thomas GrannemanOregon Mark PerduePennsylvania Nathaniel SmithSouth Carolina Ronald W. SpikerSouth Dakota .Aaron LorimorTennessee Sam ChapmanTexas .Rob TrouttUtah Rick SturmVirgi
35、nia . Edward HiltonWashington . Tony OdaWest Virginia John PorcellaWisconsin Terrence WaldbilligChicago, IL .Michael RyanDetroit, MI Cortney JacksonLos Angeles, CA . Cirilo ReyesMilwaukee, WI Jillian KlugNew York, NY William McGivneySeattle, WA Larry LeetAlberta Michael PoehlmannBritish Columbia .An
36、thony SchollManitoba Ryan DeLuryNew Brunswick Eben CreaserNewfoundland and if found insufficient, additional relieving capacity shall be provided:1) By performing an accumulation test, that is, by shutting off all other steam discharge outlets from the boiler and forcing the fires to the maximum. Th
37、is method should not be used on a boiler with a superheater or reheater or on a high-temperature water boiler.2) By measuring the maximum amount of fuel that can be burned and computing the corresponding evaporative capacity upon the basis of the heating value of the fuel.3) By determining the maxim
38、um evaporative capacity by measuring the feedwater. The sum of the pressure relief valve capacities marked on the valves shall be equal to or greater than the maxi-mum evaporative capacity of the boiler. This method should not be used on high-temperature water boilers.5NATIONAL BOARD INSPECTION CODE
39、2017SECTION 2SECTION 2TABLE 2.2.4.1 MINIMUM POUNDS OF STEAM PER HOUR PER SQUARE FOOT OF HEATING SURFACE LB STEAM/HR FT2(KG STEAM/HR M2)Firetube Boiler Watertube BoilerBoiler Heating Surface Hand-fired 5 (24) 6 (29)Stoker-fired 7 (34) 8 (39)Oil, gas, or pulverized fuel-fired 8 (39) 10 (49)Waterwall H
40、eating Surface Hand-fired 8 (39) 8 (39)Stoker-fired 10 (49) 12 (59)Oil, gas, or pulverized coal 14 (68) 16 (78)Copper-finned WatertubesHand-fired 4 (20)Stoker-fired 5 (24)Oil, gas, or pulverized fuel-fired 6 (29)Notes: When a boiler is fired only by a gas having a heat value not in excess of 200 Btu
41、/ft3(7.5MJ/m3), the minimum relieving capacity should be based on the values given for hand-fired boilers above. The heating surface shall be computed for that side of the boiler surface exposed to the products of combustion, exclusive of the superheating surface. In computing the heating surface fo
42、r this purpose only the tubes, fireboxes,shells, tubesheets, and the projected area of headers need to be considered, except that for vertical firetube steam boilers, only that portion of the tube surface up to the middle gage cock is to be computed. For firetube boiler units exceeding 8000 Btu/ft2(
43、9085 J/cm2) (total fuel Btu (J) Input divided by total heating surface), the factor from the table will be increased by 1 (4.88) for every 1000 Btu/ft.2(1136 J/cm2) above 8000 Btu/ft.2(9085 J/cm2) For units less than 7000 Btu/ft2(7950 J/cm2), the factor from the table will be decreased by 1 (4.88).
44、For watertube boiler units exceeding 16000 Btu/ft2(18170 J/cm2)(total fuel Btu input divided by the total heating surface) the factor from the table will be increased by 1 (4.88) for every 1000 Btu/ft.2(1136 J/cm2) above 16000 Btu/ft.2(18170 J/cm2). For units with less than 15000 Btu/ft.2(17034 J/cm
45、2), the factor in the table will be decreased by 1 (4.88) for every 1000 Btu/ft.2 (1136 J/cm2) below 15000 Btu/ft.2 (17034 J/cm2).2.2.5 SET PRESSUREOne or more pressure relief valves on the boiler proper shall be set at or below the maximum allowable working pressure. If additional valves are used,
46、the highest pressure setting shall not exceed the maximum allowable working pressure by more than 3%. The complete range of pressure settings of all the pressure relief valves on a boiler shall not exceed 10% of the highest pressure to which any valve is set. Pressure setting of pressure relief valv
47、es on high temperature water boilers may exceed this 10% range.62017SECTION 2SECTION 2NB-232.2.6 FORCED-FLOW STEAM GENERATORSFor a forced-flow steam generator with no fixed steamline and waterline, equipped with automatic controls and protective interlocks responsive to steam pressure, pressure reli
48、ef valves may be provided in accordance with the above paragraphs identified in 2.2.5 or the following protection against overpressure shall be provided:a) One or more power-actuated pressure relief valves shall be provided in direct communication with the boiler when the boiler is under pressure an
49、d shall receive a control impulse to open when the maximum allowable working pressure at the superheater outlet is exceeded. The total combined relieving capacity of the power actuated pressure relief valves shall be not less than 10% of the maximum design steam-ing capacity of the boiler under any operating condition as determined by the manufacturer. The valves shall be located in the pressure part system where they will relieve the overpressure. An isolating stop valve of the outside-screw-and-yoke type should be installed between the power actuated
