1、ROUND INDUSTRIAL DUCT CONSTRUCTION STANDARDSSHEET METAL AND AIR CONDITIONING CONTRACTORS NATIONAL ASSOCIATION, INC. www.smacna.orgANSI/SMACNA 0052013ROUND INDUSTRIAL DUCT CONSTRUCTION STANDARDSTHIRD EDITION 2013SHEET METAL AND AIR CONDITIONING CONTRACTORSNATIONAL ASSOCIATION, INC.4201 Lafayette Cent
2、er DriveChantilly, VA 20151-1209www.smacna.orgROUND INDUSTRIAL DUCT CONSTRUCTION STANDARDSCOPYRIGHT1977, 2013All Rights Reserved bySHEET METAL AND AIR CONDITIONING CONTRACTORS NATIONAL ASSOCIATION, INC.4201 Lafayette Center DriveChantilly, VA 201511219Printed in the U.S.A.FIRST EDITION 1977SECOND ED
3、ITION 1999THIRD EDITION 2013ISBN 978-1-61721-106-5 PrintISBN 978-1-61721-108-9 PDFExcept as allowed in the Notice to Users and in certain licensing contracts, no part of this book may be reproduced, stored in a retrievable system, or transmitted, in any form or by any means, electronic, mechanical,
4、photocopying, recording, or otherwise, without the prior written permission of the publisher.ANSI/SMACNA 0052013Round Industrial Duct Construction Standards Third Edition iiiFOREWORDThese duct construction standards are intended for use by contractors, fabricators, and designers of air pollution con
5、-trol, pneumatic conveyance, and industrial ventilation systems.Changes in the Third Edition The changes in this edition are relatively minor; generally refl ecting clarifi cations based on contractors technical inquiries, and three main changes as described below:In the Duct Materials chapter, Alum
6、inized Steel was added including a description of its unique corrosion and heat resistant characteristics, available thicknesses, and common uses.In the Duct Selection Tables for Carbon and Galvanized chapter, it was assumed that the yield strength and modulus of elasticity of carbon steel remains r
7、elatively constant from ambient to the maximum recommended design temperature of 650 F (345 C). However, the reality is that both strength characteristics drop a few percent, and while this effect is more signifi cant in the design of rectangular duct, it was decided that for the sake of consistency
8、, the temperature correction factors established for rectangular industrial duct be adopted for round industrial as well. An analysis of the impact of this strength reduction reveals that in the over-whelming majority of cases there is no change in selected gage thickness from the previous edition.
9、The reason for this is that when selecting duct material, we compare the calculated metal thickness to the equiva-lent decimal thickness of the selected gage, and since the selected gage must exceed the required thickness, the excess thickness offsets the increase required by the drop in metal stren
10、gth. In the data of all the duct selection tables, only one case out of hundreds, required change to a heavier gage over the previous edition.The other signifi cant change is in the duct selection tables for Aluminum. Whereas aluminum sheet thickness has traditionally been based on the Brown and Sha
11、rp gage; for a number of years now, both manufacturers and users of aluminum identify sheet thickness by the decimal equivalent of the same Brown and Sharp gage. To simplify ordering material the aluminum tables have been updated from gage number to its decimal equivalent (nominal thickness), while
12、calculations are still based on the minimum decimal thickness from the Brown and Sharp gage (See Table 37).Users of this standard should note that, as with the use of the term “duct“, the term “pipe” can be used when indicating conveyance of air between two points. The term “pipe” originated in foun
13、dries and pneumatic conveying applications for industrial environments, and historically the terminology of “pipe” and “duct” have been used interchangeably. Likewise, theses terms have been used interchangeably within the scope of the SMACNA Round Industrial Duct Construction Standard.Changes in th
14、e Second Edition The 1977 edition of these standards was the fi rst publication dealing with the selection of duct gage and reinforcing systems for industrial duct applications. While the fi rst edition served industry very well for many years, technology has continued to move forward, and the Indus
15、trial Task Force of SMACNA has responded to our memberships request to expand and update the original text. We are taking their request one step further by restructuring the manual and providing supportive software to make the design process more “user friendly.” One of the main considerations in th
16、e development of the new standards is the opportunity to create a software program for personal computers that can greatly expand the computational capability of the user and permits an almost unlimited examination of different con-struction details and design solutions. A comprehensive review of th
17、e old procedures was completed and modifi cations implemented to update the technology and make the design procedures compatible with the computerization effort.While the new procedures include many of the same assumptions as the original work, a number of new features have been added:Microsoft Wind
18、ows based calculation software to expedite selection of construction details (software sold separately)iv Round Industrial Duct Construction Standards Third EditionFour different types of carbon steel and two different types of galvanized steelSeven different types of stainless steel alloysFour diff
19、erent types of aluminum alloysDesign capability for high temperature systems up to 800F (427C), and higher with design review by a specialized professionalConsideration of wind, snow, ice, and maintenance loadsExpanded tables to include ducts to 96 in. (2440 mm)Expanded tables to include material up
20、 to in. (12.7 mm) thicknessAll data presented in both English (InchPound) and Metric (SI) unitsExpanded data for the selection of duct supportsChapter on the use of spiral lockseam pipe in industrial applicationsAccepted industry practice for round industrial ductsNew Duct Class 5 for systems handli
21、ng corrosivesNew chapter on weldingNew guide specifi cation for the fabrication and installation of industrial duct systemsChapter of practical examples with step- by- step calculation instructionsChapter of fl ow charts to guide the user in design processThe Industrial Task Force is greatly indebte
22、d to Dr. Michael C. Soteriades, who did the original work for the fi rst edition and also provided the professional consultation and analysis necessary for the development of this new and expanded publication.SHEET METAL AND AIR CONDITIONING CONTRACTORS NATIONAL ASSOCIATION, INC.Round Industrial Duc
23、t Construction Standards Third Edition vROUND INDUSTRIAL DUCT CONSTRUCTION TASK FORCEThe SMACNA Round Industrial Duct Construction Task Force develops and maintains standards for the design and construction of industrial ventilation and air pollution control systems.Ken Groeschel, Jr., P.E., Chairma
24、nButters Fetting Co.Malone, WisconsinRussell BoweAllied Blower update the theoretical basis for design; improve the presentation to make the expanded publica-tion more “user friendly;” to cover both the simple, low or moderate temperature and pressure indoor systems, as well as the more complex outd
25、oor systems, operating at moderate to high temperature and pressure, and sub-jected to higher and more complex external loading.To achieve these objectives the following steps were taken:A professional review of the theoretical basis for the fi rst edition was completed and a few recommendations for
26、 simplifi cation of the math model and liberalization of the original safety factor were implemented. (For the range of diameters covered in the fi rst edition 4 to 60 in. (100 to 1675 mm), the original safety factor (for negative pressure) was a function of diameter, and its value varied from 4 to
27、8; the safety factor adopted for the second edition is a constant 4.0, regardless of diameter.)Laboratory testing and data analysis on spiral lockseam pipe were completed to support the addition of this important fabrication tech-nique to those already covered in the fi rst edition.Material previous
28、ly covered in broad terms was expanded through in- depth coverage. Whole new chapters were added covering 1.2 Round Industrial Duct Construction Standards Third Editionsuch duct fabrication topics as Stiffeners, Flanges, and Fasteners; Hangers and Supports; Welding; Accepted Industrial Duct Construc
29、tion Practices; and a Guide Specifi cation.To provide for the design process of duct sys-tems from the very simple to the complex, while making the process “user friendly,” the design or duct selection process was divided into three separate avenues: the Table Driven Process (mainly for indoor appli
30、cations), the RIDCS Software Process (for any type of application), and the Manual Calculation Process (for the processing of the full range of simple to complex cases and for the inves-tigation of existing duct systems).1.4 INDUSTRIAL DUCT DESIGN AVENUESThree different approaches, or design avenues
31、 to indus-trial duct design were identifi ed, as described below:Table Driven Process The duct selection data for longitudinal seam pipe is divided into three chapters, each dealing with a dif-ferent material type: Carbon and Galvanized (Chapter 8), Stainless Steel (Chapter 9), and Aluminum (Chapter
32、 10). Spiral lockseam pipe is covered in one chapter, Chapter 11, and is further sub- divided into three main sections, each dealing with a different mate-rial type. Each chapter has its own set of detailed examples covering the main selec-tion options. Use of this design process is limited to indoo
33、r applications.RIDCS Software Process A Microsoft Windows based calculation software was developed to facilitate the duct selection pro-cess for most applications, from the simple to the more complex, with no loss of design fl exibility or design alternatives. The RIDCS software also provides a usef
34、ul record of stored electronic data fi les, as well as printed Engineering and Fabrication Reports. (RIDCS Software COPYRIGHT 1999, All rights reserved by the Sheet Metal and Air Conditioning Contractors National Association, Inc.)Manual Calculation Process While this process is more academically de
35、manding, the average user may benefi t from it. The fl ow charts in Chapter 6 and the examples in Chapter 7 were both developed as guidance and support for those who have the inclination, or the need, to manually calculate specifi c requirements for a single design element or for a complete system.
36、Additionally, the manual process gives the user the tools for “back- calculating” maximum operating conditions for existing duct. The other two design avenues are not easily manipulated for such a task.1.5 HOW TO USE THIS MANUALAs described in the above, it has been an objective of the Industrial Ta
37、sk Force to make this publication more “user friendly” than its predecessor.The following tips are intended to familiarize the user with the content and organization of this manual. They are also intended to guide the user in selecting the right chapter or sequence of chapters to consult depending o
38、n the immediate objective.a. Section 1.4 provides information about the available design alternatives and helps determine the one most appropriate for the immediate design task.b. Chapters 2 and 3 are especially important to the specifying engineer or to a design/build contractor. Chapter 2 contains
39、 basic informa-tion necessary for identifying and specifying the duct class, and the fl ow characteristics of particulate in the airstream. Chapter 3 deals entirely with detailed information on the physical characteristics of all the metals cov-ered by these construction standards; it also includes
40、a corrosion table covering various metals and liner materials and their corrosion performance when subjected to various cor-rosive agents. Chapter 3 information is useful in either selecting and specifying a duct material or in identifying the physical charac-teristics of specifi ed duct materials.c
41、. Chapters 4, 5, 6, and 7 are of primary interest to the user that intends to follow the Manual Calculation Process avenue of design. The user who intends to follow either of the other two avenues of design (Table Driven Process or RIDCS Software Process) may only have occasional reason to investiga
42、te the theory in Chapters 4 and 5. There is useful information and guidance in these four chapters that may be of greatest benefi t to specifying engineers, Round Industrial Duct Construction Standards Third Edition 1.3designers, and contractors that get involved with extreme or unusual design situa
43、tions.d. Chapters 8, 9, 10, and 11 constitute the bulk of the material needed for a Table Driven Process solution.e. Chapter 12, 13, 14, and 15 all deal with construction details and accepted industry practices for round duct, fi ttings, and other appurtenances. These chapters are of interest to all
44、 users.f. Chapter 16 is a guide specifi cation for indus-trial duct construction and installation. It is of most interest to specifying engineers.g. Chapter 17 is the RIDCS Software Users Manual. It is of primary interest to potential purchasers of the software since it gives a very good description
45、 of the program and its capabilities.h. The Appendices and Glossary contain termi-nology, design data, and other supplementary information useful to both specifi ers and con-tractors.1.6 MANUAL CONTENTSCHAPTER 1 INTRODUCTIONThe introduction outlines the format and layout of the manual, provides inst
46、ruction for its use, and contains a summary of the contents of each chapter.CHAPTER 2 INDUSTRIAL DUCT APPLICATIONSThis chapter contains various defi nitions and informa-tion related to industrial duct classes, as well as rele-vant physical characteristics of materials frequently conveyed in industri
47、al duct systems. It is envisioned that the designer will use the information contained in this chapter (or similar information from other sources such as those listed in section 2.2) to specify the most appropriate Duct Class for the system under consider-ation, and the concentration and characteris
48、tics of the materials being conveyed. The specifi cation of the Duct Class and an accurate appraisal of the charac-teristics of the materials being conveyed play a critical role in the successful design of an industrial duct sys-tem. Their importance can not be over- emphasized.CHAPTER 3 DUCT MATERI
49、ALSThis chapter contains detailed information on the physical characteristics of the most common materials used in industrial duct construction. Also included are brief descriptions of each material type, its most com-mon uses, and some limitations that may apply. It is envisioned that this chapter will be used as a reference by contractors and duct designers using the design procedures in Chapters 4 and 5 and the examples in Chapter 7, or using the design tables in Chapters 8 through 11. For purposes of calculation an
