1、READ METABLE OF CONTENTS2018UNIFORMMECHANICALCODEAn American National StandardIAPMO/ANSI UMC 1 2018Copyright 2018 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 express
2、ly permitted in writing by the publisher.Twenty-Eighth Edition First Printing, January 2018Published 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) 472-4150Important Notices and Di
3、sclaimersThe 2018 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 mechanical issues.
4、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 any judgments conta
5、ined 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 document. IAPMO also make
6、s 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 perform any duty owed b
7、y 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 reasonable carein any given circumstances.Updating IAPMO CodesUsers of IAPMO codes should
8、 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 determine whether an IAP
9、MO code has been amended through the issuance ofTentative Interim Amendments or corrected by Errata, please visit the IAPMO Group codesinformation pages on IAPMOs website (www.iapmo.org). The codes information pagesprovide a list of IAPMO codes with up-to-date specific information including any issu
10、edTentative 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 information.iiiOrigin
11、 and DevelopmentThe industry has long recognized the advantages of a statewide adopted mechanicalcode. The first edition of the Uniform Mechanical Code(UMC) was adopted by IAPMOin 1967. The widespread use of this code over the past five decades by jurisdictionsthroughout the United States and intern
12、ationally is testament to its merit.Publishing the 2003 Uniform Mechanical Code, is a significant milestone because it is thefirst time in the history of the United States, a mechanical code was developed through a trueconsensus process. The 2018 edition represents the most current approaches in the
13、mechanical field and is the sixth edition developed under the ANSI consensus process.Contributions to the content of this code consists of diverse interests as consumers,enforcing authorities, installers/maintainers, labor, manufacturers, research/standards/testinglaboratories, special experts, and
14、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 invited and encouraged
15、 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 to create and maintain
16、this,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 final datesfor all major events and con
17、tains 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 of interests. This phi
18、losophy 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 CorrelatingCommittees revi
19、se codes. The public and membership is offered multiple opportunities todebate, 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 Council.The 2018 Uniform
20、 Mechanical Code is supported by the Mechanical ContractorsAssociation of America (MCAA), the Plumbing-Heating-Cooling Contractors NationalAssociation (PHCC-NA), the United Association (UA), and the World Plumbing Council(WPC). The presence of these logos, while reflecting support, does not imply an
21、yownership of the copyright to the UMC, which is held exclusively by IAPMO. Further, thelogos of these associations indicate the support of IAPMOs open consensus processbeing used to develop IAPMOs codes and standards.ivFOREWORDThe addresses of the organizations are as follows:ASSE 18927 Hickory Cre
22、ek Drive, Suite 220 Monkena, IL 60448 995-3019MCAA 1385 Piccard Drive Rockville, MD 20850 (301) 869-5800PHCC-NA PO Box 6808 Falls Church, VA 22040-6808 (800) 533-7694RPA 18927 Hickory Creek Drive, Suite 220 Mokena, IL 60448 (877) 427-6601UA Three Park Place Annapolis, MD 21401 (410) 269-2000WPC Worl
23、d Plumbing Council Secretariat, Auf der Mauer 11 Postfach CH 8021 ZurichSwitzerland WWW.WorldPlumbing.orgAdoptionThe Uniform Mechanical Code is available for adoption and use by jurisdictions in theUnited States and Internationally. Its use within a governmental jurisdiction isaccomplished through a
24、doption by reference in accordance with applicable jurisdictionallaws. At adoption, jurisdictions should insert the applicable information in bracketed wordsin the sample ordinance. The sample legislation for adoption of the Uniform MechanicalCode on page xi provides key components, regulations and
25、resolutions.Revision MarkingsSolid vertical lines in the margins indicate a technical change from the requirements of the2015 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 delete
26、d.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 2018 editionof the Uniform Mechanical Code.TIA indicates that the revision is the result of a Tentative Interim Amendment. For fu
27、rther information on tentative interim amendments see Section 5 of the IAPMORegulationsGoverning Committee Projects available at http:/codes.iapmo.org/A reference in brackets following a section or paragraph indicates material that has beenextracted from another document. This reprinted material is
28、not the complete and officialposition of the source document on the referenced subject that is represented by thestandard in its entirety. Text that is extracted pursuant to IAPMOs Extract Guidelines, but outside of the regularrevision process is denoted with the use of the source document in the ma
29、rgin. 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 processes such text in accordance with thoserequirements. vFOREWORDTIATIAT
30、IATIAThe 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 divided as follows:CHAPTERS SUBJECTS1 Administration2 Definitio
31、ns3 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 Solar Energy Systems16 Stationary Power Plants17 Referenced
32、 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 Supply: Manufactured/MobileHome Parks and Recreational Vehicle
33、ParksAppendix E Sustainable PracticesAppendix F Sizing of Venting Systems and OutdoorCombustion and Ventilation OpeningDesignAppendix G Example Calculation of Outdoor AirRateviFORMAT OF THE UNIFORM MECHANICAL CODEThe following is a summary of the scope and intent of the provisions addressed within t
34、he 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 chapter is concerned with enforcing the requirements cont
35、ained in the body of thecode. A mechanical code, as with any other code, is intended to be adopted as a legally enforceable document to safeguardhealth, safety, property and public welfare. The code cannot be effective without satisfactory provisions for its administrationand enforcement. The Author
36、ity Having Jurisdiction is to review the proposed and completed work and to decide whether amechanical system conforms to the code requirements. As a public servant, the Authority Having Jurisdiction enforces thecode in an unbiased, proper manner. The design professional is responsible for the desig
37、n of a safe mechanical system. Thecontractor 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 to provide clarity ofterms and promote the use of a common
38、 language throughout the code. Understanding definitions within the context of theirapplication enables greater collaboration, efficiency, standardization and interpretation in applying and enforcing terms usedthroughout the code. Codes are technical documents, and every term can impact the meaning
39、of the code text. Terms notdefined 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 specific mechanical requirements, but relate to the overall mech
40、anical 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 method of approval, based onapplicable nationally recognized
41、 standards, for the safe and proper installation of mechanical systems is essential to ensureprotection of public health, safety, and welfare. The safety requirements provide protection for piping, material, and structures,with provisions for installation practices, removing stress and strain of the
42、 pipe, sleeving, and hanger support. The buildingsstructural stability is protected by the regulations for cutting and notching of structural members. Chapter 4 Ventilation Air.Chapter 4 regulates the minimum requirements for ventilation air supply, exhaust, and makeup air for spaces within a buildi
43、ng.Building ventilation is one important factor affecting the relationship between airborne transmission of respiratory infectionsand the health and productivity of workers. Ventilation air may be composed of mechanical or natural ventilation, infiltration,recirculated air, transfer air, or a suitab
44、le combination of that. Providing a comfortable and healthy indoor environment forbuilding occupants is of primary concern. When considering how much ventilation should be supplied, typical and unusualsignificant sources of indoor pollution need to be controlled. Areas such as kitchens, bathrooms, a
45、nd laundries are all built toallow specific functions. These spaces produce pollutants such as moisture, odors, volatile organic compounds, particles, orcombustion byproducts. The purpose of local exhaust is to control concentrates of these pollutants in the room into which theywere emitted in and t
46、o reduce the spread of the pollutants into other parts of the occupancy. Local exhaust ventilation is thesource control for pollution that is expected in certain rooms. Using local exhaust to extract contaminants before they can mixwith the indoor environment is essential. Chapter 5 Exhaust Systems.
47、 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 for commercialkitchens. Environmental air ducts include exhaust ducts us
48、ed for transporting the air from domestic kitchens, bathrooms, andclothes dryers. Systems that carry nonabrasive exhaust, such as smoke, moderately abrasives such as sawdust, and highabrasives such as manganese or acid vapors use product-conveying ducts. Part II provides the minimum fire safetyrequi
49、rements 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 pollutants.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. There are two types of exhaust hoods (Type Iand Type II) used in commercial kitchen applications.
