1、 2015UNIFORMMECHANICALCODEan american national standardIAPMO/ANSI UMC 1 2015Copyright 2015 International Association of Plumbing and Mechanical Officials All Rights ReservedNo part of this work may be reproduced or recorded in any form or by any means, except as may be expressly permitted in writing
2、 by the publisher.Twenty-Seventh Edition First Printing, January 2015Second Printing, April 2016ISSN 1081-0021Published by the International Association of Plumbing and Mechanical Officials4755 E. Philadelphia Street Ontario, CA 91761-2816 USA Main Phone: (909) 472-4100 Main Fax: (909) 472-4150Impor
3、tant Notices and DisclaimersThe 2015 edition of the Uniform Mechanical Code is developed through a consensusstandards development process approved by the American National Standards Institute.This process brings together volunteers representing varied viewpoints and interests toachieve consensus on
4、mechanical issues. While the International Association of Plumbingand Mechanical Officials (IAPMO) administers the process and establishes rules to promotefairness in the development of consensus, it does not independently test, evaluate, or verifythe accuracy of any information or the soundness of
5、any judgments contained in its codesand standards.IAPMO disclaims liability for any personal injury, property, or other damages of any naturewhatsoever, whether special, indirect, consequential, or compensatory, directly or indirectlyresulting from the publication, use of, or reliance on this docume
6、nt. IAPMO also makes noguarantee or warranty as to the accuracy or completeness of any information publishedherein.In issuing and making this document available, IAPMO is not undertaking to renderprofessional or other services for or on behalf of any person or entity. Nor is IAPMOundertaking to perf
7、orm any duty owed by any person or entity to someone else. Anyoneusing this document should rely on his or her own independent judgment or, as appropriate,seek the advice of a competent professional in determining the exercise of reasonablecare in any given circumstances.Updating IAPMO CodesUsers of
8、 IAPMO codes should be aware that IAPMO codes may be amended from time totime through the issuance of Tentative Interim Amendments or corrected by Errata. IAPMOcodes consist of the current edition of the document together with any Tentative InterimAmendment and any Errata in effect.In order to deter
9、mine whether an IAPMO code is has been amended through the issuanceof Tentative Interim Amendments or corrected by Errata, please visit the IAPMO Groupcodes information pages on IAPMOs website (www.iapmo.org). The codes informationpages provides a list of IAPMO codes with up-to-date specific informa
10、tion including anyissued Tentative Interim Amendments and Errata.To access the code information pages for a specific code, go to http:/codes.iapmo.org toselect from the list of IAPMO codes. For Tentative Interim Amendments, go to the standardcouncil decisions. For Errata select the archived revision
11、 information.iiiOrigin and DevelopmentThe industry has long recognized the advantages of a statewide adopted mechanicalcode. The first edition of the Uniform Mechanical Code (UMC) was adopted byIAPMO in 1967. The widespread use of this code over the past five decades byjurisdictions throughout the U
12、nited States and internationally is testament to its merit.Publishing the 2003 Uniform Mechanical Code, is a significant milestone because it isthe first time in the history of the United States, a mechanical code was developedthrough a true consensus process. The 2015 edition represents the most cu
13、rrentapproaches in the mechanical field and is the fifth edition developed under the ANSIconsensus process. Contributions to the content of this code consists of diverseinterests as consumers, enforcing authorities, installers/maintainers, labor,manufacturers, research/standards/testing laboratories
14、, special experts, and users.The Uniform Mechanical Code provides consumers with complete requirements for theinstallation and maintenance of heating, ventilating, cooling, and refrigeration systems,while, at the same time, allowing latitude for innovation and new technologies. The publicat large is
15、 invited and encouraged to take part in IAPMOs open consensus codedevelopment process. This code is updated every three years. The Uniform MechanicalCode is dedicated to all those who in working to achieve “the ultimate mechanical code”have unselfishly devoted their time, effort, and personal funds
16、to create and maintainthis, the finest mechanical code in existence today.The Uniform Mechanical Code updates every three years in revision cycles that begintwice each year that takes two years to complete. Each revision cycle advances according to a published schedule that includes finaldates for a
17、ll major events and contains four basic steps as follows:1. Public and Committee Proposal Stage;2. Comment Stage;3. Association Technical Meeting;4. Council Appeals and Issuance of Code.IAPMO develops “full consensus” codes built on a foundation of maximum participationand agreement by a broad range
18、 of interests. This philosophy has led to producingtechnically sound codes that promote health and safety, yet do not stifle design ordevelopment. It is important to stress that, the process remains committed to the principles ofconsensus code development where consensus Technical Committees and Cor
19、relatingCommittees revise codes. The public and membership is offered multiple opportunitiesto debate, provide input and raise concerns through Amending Motions at the annualAssembly Consideration Session. Anyone may submit an appeal related to the issuanceof a document through the IAPMO Standards C
20、ouncil.The 2015 Uniform Mechanical Code is supported by the American Society of SanitaryEngineering (ASSE), the Mechanical Contractors Association of America (MCAA), thePlumbing-Heating-Cooling Contractors National Association (PHCC-NA), the UnitedAssociation (UA), and the World Plumbing Council (WP
21、C). The presence of these logos,while reflecting support, does not imply any ownership of the copyright to the UMC,which is held exclusively by IAPMO. Further, the logos of these associations indicate thesupport of IAPMOs open consensus process being used to develop IAPMOs codesand standards.ivFOREW
22、ORDThe addresses of the organizations are as follows:ASSE 18927 Hickory Creek Drive, Suite 220 Mokena, IL 60448 (708) 995-3019MCAA 1385 Piccard Drive Rockville, MD 20850 (301) 869-5800PHCC-NA PO Box 6808 Falls Church, VA 22046 (800) 533-7694UA Three Park Place Annapolis, MD 21401 (410) 269-2000WPC W
23、orld Plumbing Council Secretariat, 353 Shepperton Road East Victoria Park6101 Western Australia +61 (439) 943-098AdoptionThe Uniform Mechanical Code is available for adoption and use by jurisdictions in theUnited States and Internationally. Its use within a governmental jurisdiction isaccomplished t
24、hrough adoption by reference in accordance with applicablejurisdictional laws. At adoption, jurisdictions should insert the applicable information inbracketed words in the sample ordinance. The sample legislation for adoption of theUniform Mechanical Code on page xi provides key components, regulati
25、ons andresolutions.Revision MarkingsSolid vertical lines in the margins indicate a technical change from the requirements of the2012 edition. An arrow ( ) in the margin indicates where an entire section, paragraph,exception or table has been deleted, or an item in a list of items or a table has been
26、 deleted.A double right angle()in the margin indicates that the text or a table has been relocatedwithin the code. The table found on page xiii points out the relocations in the 2015 editionof the Uniform Mechanical Code.A reference in brackets following a section or paragraph indicates material tha
27、t hasbeen extracted from another document. This reprinted material is not the complete andofficial position of the source document on the referenced subject that is represented bythe standard in its entirety. Text that is extracted pursuant to IAPMOs Extract Guidelines, but outside of the regularrev
28、ision process is denoted with the use of the source document in the margin. This text isnot fully processed by IAPMO in accordance with ANSIs public announcement consensusrequirements for an American National Standard (ANS) nor approved by ANSIs Board ofStandards Review. The next revision cycle proc
29、esses such text in accordance with thoserequirements. vFOREWORDThe format of the Uniform Mechanical Code (UMC) arranges each chapter in accordance with aspecific subject matter. However, Chapter 3 is dedicated to general requirements that areapplicable to every chapter. The subject matters are divid
30、ed as follows:CHAPTERS SUBJECTS1 Administration2 Definitions3 General Regulations4 Ventilation Air5 Exhaust Systems6 Duct Systems7 Combustion Air8 Chimneys and Vents9 Installation of Specific Appliances10 Boilers and Pressure Vessels11 Refrigeration12 Hydronics13 Fuel Gas Piping14 Process Piping15 S
31、olar Energy Systems16 Stationary Power Plants17 Referenced StandardsAppendix A Residential Plan Examiner ReviewForm for HVAC System DesignAppendix B Procedures to be Followed to PlaceGas Equipment in OperationAppendix C Installation and Testing of Oil (Liquid)Fuel-Fired EquipmentAppendix D Fuel Supp
32、ly: Manufactured/MobileHome Parks and Recreational VehicleParksAppendix E Sustainable PracticesAppendix F Sizing of Venting Systems andOutdoor Combustion and VentilationOpening DesignAppendix G Example Calculation of Outdoor AirRateviFORMAT OF THE UNIFORM MECHANICAL CODEThe following is a summary of
33、 the scope and intent of the provisions addressed within the chapters and appendices of theUniform Mechanical Code:Chapter 1 Administration. Chapter 1 regulates the application, enforcement, and administration of subsequent requirements of the code. As well asestablishing the scope of the code, this
34、 chapter is concerned with enforcing the requirements contained in the body of thecode. A mechanical code, as with any other code, is intended to be adopted as a legally enforceable document tosafeguard health, safety, property and public welfare. The code cannot be effective without satisfactory pr
35、ovisions for itsadministration and enforcement. The Authority Having Jurisdiction is to review the proposed and completed work and todecide whether a mechanical system conforms to the code requirements. As a public servant, the Authority HavingJurisdiction enforces the code in an unbiased, proper ma
36、nner. The design professional is responsible for the design of asafe mechanical system. The contractor is responsible for installing the system in accordance with the plans. Chapter 2 Definitions. To maintain consistency and encourage the use of common terminology, Chapter 2 establishes definitions
37、to provide clarityof terms and promote the use of a common language throughout the code. Understanding definitions within the context oftheir application enables greater collaboration, efficiency, standardization and interpretation in applying and enforcing termsused throughout the code. Codes are t
38、echnical documents, and every term can impact the meaning of the code text. Termsnot defined have a normally accepted meaning.Chapter 3 General Regulations. Chapter 3 regulates the general requirements, not specific to other chapters, for installing mechanical systems. Manyregulations are not specif
39、ic mechanical requirements, but relate to the overall mechanical system. This chapter containssafety requirements for appliance location and installation, appliance and system access, condensate disposal, andclearances to combustibles, and return or outside air used in mechanical systems. Listing or
40、 labeling method of approval,based on applicable nationally recognized standards, for the safe and proper installation of mechanical systems is essentialto ensure protection of public health, safety, and welfare. The safety requirements provide protection for piping, material,and structures, with pr
41、ovisions for installation practices, removing stress and strain of the pipe, sleeving, and hangersupport. The buildings structural stability is protected by the regulations for cutting and notching of structural members. Chapter 4 Ventilation Air.Chapter 4 regulates the minimum requirements for vent
42、ilation air supply, exhaust, and makeup air for spaces within abuilding. Building ventilation is one important factor affecting the relationship between airborne transmission of respiratoryinfections and the health and productivity of workers. Ventilation air may be composed of mechanical or natural
43、 ventilation,infiltration, recirculated air, transfer air, or a suitable combination of that. Providing a comfortable and healthy indoorenvironment for building occupants is of primary concern. When considering how much ventilation should be supplied,typical and unusual significant sources of indoor
44、 pollution need to be controlled. Areas such as kitchens, bathrooms, andlaundries are all built to allow specific functions. These spaces produce pollutants such as moisture, odors, volatile organiccompounds, particles, or combustion byproducts. The purpose of local exhaust is to control concentrate
45、s of these pollutantsin the room into which they were emitted in and to reduce the spread of the pollutants into other parts of the occupancy.Local exhaust ventilation is the source control for pollution that is expected in certain rooms. Using local exhaust to extractcontaminants before they can mi
46、x with the indoor environment is essential. Chapter 5 Exhaust Systems. Chapter 5 regulates the minimum requirements for exhaust systems. Chapter 5 contains two parts: part I provides exhaustrequirements for environmental air ducts and product conveying ducts; part II provides exhaust requirements fo
47、r commercialkitchens. Environmental air ducts include exhaust ducts used for transporting the air from domestic kitchens, bathrooms,and clothes dryers. Systems that carry nonabrasive exhaust, such as smoke, moderately abrasives such as sawdust, andhigh abrasives such as manganese or acid vapors use
48、product-conveying ducts. Part II provides the minimum fire safetyrequirements related to the design, installation, inspection, and maintenance of grease-type operations, such as cooking, forboth fuel-gas and solid fuel. Cooking produces a significant amount of smoke, fumes, vapors, heat, and other p
49、ollutants.Therefore, acceptable kitchen ventilation is necessary to provide the occupants protection from smoke, unpleasant odors,pollutants, dangerous gases, and to prevent fires from the build-up of grease. viiFORMAT OF THE UNIFORM MECHANICAL CODEChapter 6 Duct Systems. Chapter 6 regulates requirements for ducts and plenums that are portions of a heating, cooling, absorption or evaporativecooling, or exhaust system. This chapter contains material and installa
