1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 60079-2 Explosive Atmospheres Part 2: Equipment Protection by Pressurized Enclosure p STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHO
2、UT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Explosive atmospheres Part 2: Equipment protection by pressurized enclosure p, UL 60079-2 Sixth Edition, Dated June 2, 2017 Summary of Topics UL
3、60079-2 is an adoption of IEC 60079-2, Explosive Atmospheres - Part 2: Equipment Protection by Pressurized Enclosure p (Edition 6, issued by IEC July, 2014). Please note that the national difference document incorporates all of the U.S. national differences for UL 60079-2. These new requirements are
4、 substantially in accordance with Proposal(s) on this subject dated December 16, 2016 and April 7, 2017. For further information regarding Summary of Requirements, please visit https:/ THIS SIXTH EDITION REPLACES THE FIFTH EDITION. AS OF JUNE 2, 2022, UL 60079-2 EDITION 5 WILL BE WITHDRAWN. All righ
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8、tronic versions of ULs Standards for Safety agree to defend, indemnify, and hold UL harmless from and against any loss, expense, liability, damage, claim, or judgment (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Stand
9、ard on the purchasers computer system. JUNE 2, 2017 UL 60079-2 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JUNE 2, 2017 UL 60079-2 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION
10、 WITHOUT PERMISSION FROM UL JUNE 2, 2017 1 UL 60079-2 Standard for Explosive atmospheres Part 2: Equipment protection by pressurized enclosure p First Edition Not Printed Second Edition Not Printed Third Edition Not Printed Fourth Edition Not Printed Fifth Edition August, 2010 Sixth Edition June 2,
11、2017 This national standard is based on publication IEC 60079-2, Edition 6 issued July, 2014 (including corrigendum 1:2015). This ANSI/UL Standard for Safety consists of the Sixth Edition. The most recent designation of ANSI/UL 60079-2 as an American National Standard (ANSI) occurred on June 2, 2017
12、. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page or Preface. The National Difference Page and IEC Foreword are also excluded from the ANSI approval of IEC-based standards. Comments or proposals for revisions on any part of the Standard may be submitted to
13、 UL at any time. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at https:/. ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standard should be altered in any way. All of ULs Standards an
14、d all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2017 UNDERWRITERS LABORATORIES INC. ANSI/UL 60079-2-2017UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JUNE 2,
15、2017 UL 60079-2 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS Preface (UL) 8 National Differences . 10 FOREWORD . 11 INTRODUCTION . 21 1 Scope .22 2 Normative references .22 3 Terms and denitions 23 4 Protect
16、ion levels .26 5 Constructional requirements for pressurized enclosures 28 5.1 Enclosure 28 5.2 Materials .29 5.3 Doors and covers .29 5.4 Mechanical strength .30 5.5 Group I and Group II Apertures, partitions, compartments and internal components . . .30 5.6 Apertures for Static Pressurization .31
17、5.7 Insulating materials for Group I equipment 31 5.8 Sealing .32 5.9 Spark and particle barriers 32 5.10 Cells and batteries .32 6 Temperature limits .32 6.1 General 32 6.2 For Level of Protection “pxb” or Level of Protection “pyb” .33 6.3 For Level of Protection “pzc” 33 7 Safety provisions and sa
18、fety devices (except for static pressurization) 33 7.1 Suitability of safety devices for hazardous area .33 7.2 Integrity of safety devices 34 7.3 Provider of safety devices 34 7.4 Pressurization System evaluated as associated equipment .35 7.5 Sequence diagram for Level of Protection “pxb” .36 7.6
19、Ratings for safety devices 36 7.7 Group I and Group II Purging automated for Level of Protection “pxb” .37 7.8 Group I or Group II Purging criteria 37 7.9 Group III Cleaning .38 7.10 Requirements when a minimum ow rate required .38 7.11 Safety devices to detect minimum overpressure 38 7.12 Value of
20、minimum overpressure 39 7.13 Pressurizing multiple enclosures .40 7.14 Safety devices on doors and covers 40 7.15 Equipment that may remain energized 40 7.16 Equipment permitted within Level of Protection “pyb” .41 8 Safety provisions and safety devices for static pressurization 41 8.1 Suitability o
21、f safety devices for hazardous area .41 8.2 Protective gas 41 8.3 Internal sources of release .41 8.4 Group I and Group II Filling procedure .41 8.5 Group III Filling Procedure 41 JUNE 2, 2017 UL 60079-2 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISS
22、ION FROM UL 8.6 Safety devices 42 8.7 Equipment that may remain energized .42 8.8 Overpressure .42 9 Supply of protective gas 42 9.1 Backup supply 42 9.2 Independent supplies 42 9.3 Type of gas .43 9.4 Temperature 43 10 Pressurized equipment with an internal source of release 43 11 Release condition
23、s 43 11.1 No release 43 11.2 Limited release of a gas or vapour .44 11.3 Limited release of a liquid .44 12 Design requirements for the containment system .44 12.1 General design requirements 44 12.2 Infallible containment system 45 12.3 Containment system with a limited release 45 13 Protective gas
24、 and pressurizing techniques when there is an internal source of release . . . . .46 13.1 General .46 13.2 Pressurization with leakage compensation .46 13.3 Pressurization with dilution 47 14 Ignition-capable equipment .48 15 Internal hot surfaces 48 16 Type verication and tests .49 16.1 Determining
25、 the maximum overpressure rating .49 16.2 Maximum overpressure test .49 16.3 Leakage test .49 16.4 Purging test for pressurized enclosures with no internal source of release and lling procedure test for static pressurization 50 16.5 Purging and dilution tests for a pressurized enclosure with an inte
26、rnal source of release .51 16.6 Verication of minimum overpressure .54 16.7 Tests for an infallible containment system .54 16.8 Overpressure test for a containment system with a limited release .55 17 Routine tests .55 17.1 Functional test .55 17.2 Leakage test .55 17.3 Tests for an infallible conta
27、inment system .55 17.4 Test for a containment system with a limited release .55 18 Marking 55 18.1 General .55 18.2 Identifying as pressurized .56 18.3 Supplementary marking .56 18.4 Internal source of release .57 18.5 Static pressurization 57 18.6 Pressurization systems 58 18.7 Warnings required in
28、 other clauses .58 18.8 Overpressure limited by user 59 18.9 Inert gas 59 19 Instructions 59 JUNE 2, 2017 UL 60079-2 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Annex A (normative) Purging and dilution tests A.1 General .60 A.2 Criteria
29、 for compliance where the protective gas is air 60 A.3 Criteria for compliance where the protective gas is inert 61 Annex B (informative) Examples of functional sequence diagram Annex C (informative) Examples of the changes in pressure in ducts and enclosures Annex D (informative) Information to be
30、provided to the user D.1 General .72 D.2 Ducting of protective gas .72 D.2.1 Location of inlet .72 D.2.2 Ducting between pressurized enclosure and inlet 73 D.2.3 Outlets for protective gas .73 D.2.4 Additional purge time to account for ducting 73 D.2.5 Temperature of protective gas at the inlet 73 D
31、.3 Power for protective gas supply .73 D.4 Static pressurization 73 D.5 Enclosures with a containment system .73 D.6 Enclosure maximum overpressure .74 Annex E (normative) Classication of the type of release within enclosures E.1 General .75 E.2 No normal release, no abnormal release 75 E.3 No norma
32、l release, limited abnormal release 75 E.4 Limited normal release .75 Annex F (informative) Examples for the use of the dilution area concept Annex G (normative) Internal Cells and Batteries for Level of Protection “pxb” and Level of Protection “pyb” G.1 General Requirements .79 G.1.1 General 79 G.1
33、.2 Accepted Electrochemical Systems 79 G.1.3 Secondary cells and secondary batteries .79 G.1.4 Mechanical Protection .79 G.2 Electrical Protection by energy limiting circuits. 80 G.2.1 Assessing as energy limited 80 G.2.2 Protective Components 80 G.2.3 Preventing excessive gas pressure 81 G.3 Additi
34、onal requirements for Primary batteries 81 G.3.1 Prevention of reverse charging. .81 JUNE 2, 2017 UL 60079-2 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL G.3.2 Prevention of accidental charging of primary batteries .82 G.4 Additional req
35、uirements for secondary batteries .83 G.4.1 Charging of secondary batteries inside the pressurized housing .83 G.5 Specic requirements for Inherently Safe (IhS) cells and batteries .84 G.6 Equipment located inside a pressurized enclosure connected to a battery which is also located inside the pressu
36、rized enclosure and not disconnected in the event of loss of pressurization .85 G.6.1 General 85 G.6.2 Circuit Isolation .85 G.6.3 Intrinsically safe battery or inherently safe battery used with “Ex” equipment 85 G.6.4 Intrinsically Safe or Inherently Safe battery with non-Ex equipment. 86 G.7 Suppl
37、ementary marking and constructional requirements for pressurized enclosures containing one or more cells or batteries .88 G.7.1 General 88 G.7.2 Battery removal warning .88 G.7.3 Batteries requiring routine maintenance 88 G.8 Type tests 88 G.8.1 Voltage 88 G.8.2 Short circuit test for an Inherently
38、Safe Cell or Battery .88 G.8.3 Full load test for other than Inherently safe batteries .89 Annex H (normative) Internal Cells and Batteries for Level of Protection “pzc” H.1 General Requirements 90 H.1.1 General 90 H.1.2 Accepted Electrochemical Systems 90 H.1.3 Secondary cells and secondary batteri
39、es .90 H.1.4 Mechanical Protection 90 H.2 Equipment located inside a pressurized enclosure connected to a battery which is also located inside the pressurized enclosure and is not disconnected when power is removed from the enclosure. .91 H.3 Supplementary marking and constructional requirements for
40、 pressurized enclosures containing one or more cells or batteries .91 H.3.1 General 91 H.3.2 Battery removal warning 91 H.3.3 Batteries requiring routine maintenance 91 Bibliography JUNE 2, 2017 UL 60079-2 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMI
41、SSION FROM UL JUNE 2, 2017 UL 60079-2 7 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Preface (UL) This UL Standard is based on IEC Publication 60079-2: Edition 6 Standard for Safety for Explosive Atmospheres - Part 2:
42、Equipment protection by pressurized enclosure p issued July, 2014, as revised by corrigendum 1 (2015). IEC publication 60079-2 is copyrighted by the IEC. Efforts have been made to synchronize the UL edition number with that of the corresponding IEC standard with which this standard is harmonized. As
43、 a result, one or more UL edition numbers have been skipped to match that of the IEC edition number. The text, gures and tables of IEC Publication Explosive Atmospheres - Part 2: Equipment protection by pressurized enclosure p, 60079-2, copyright July 2014 are used in this Standard with the consent
44、of the IEC and the American National Standards Institute (ANSI). The IEC copyrighted material has been reproduced with permission from ANSI. ANSI should be contacted regarding the reproduction of any portion of the IEC material. The IEC Foreword and Introduction are not a part of the requirements of
45、 this Standard but are included for information purposes only. Copies of IEC Publication 60079-2 may be purchased from ANSI, 11 West 42nd Street, New York, New York, 10036, (212) 642-4900. Note Although the intended primary application of this Standard is stated in its Scope, it is important to note
46、 that it remains the responsibility of the users of the Standard to judge its suitability for their particular purpose. The following people served as members of STP 60079 and participated in the review of this standard: NAME COMPANY *B. Zimmermann, Chair R Stahl Inc. *T. Adam FM Approvals LLC R. Al
47、len Honeywell Inc. D. Ankele UL LLC S. Bihler-Lopez CML Inc. S. Blais Appleton Group K. Boegli KBB Consulting R. Brownlee Pepperl + Fuchs Inc. D. Burns Shell P&T Innovation / R&D R. Chalmers Industrial Scientic Corp. *C. Coache National Fire Protection Association D. Cook Shelby County Department of
48、 Development Services M. Coppler Det Norske Veritas Certication Inc. D. Mario Consultant T. Dubaniewicz NIOSH G. Edwards Rosemount Inc. M. Ehrmann R Stahl Inc M. Egloff Montana Tech, University of Montana D. El Tawy Solar Turbines Inc. *A. Engler Det Norske Veritas DNV Z. Fosse DEKRA Certication Inc
49、 G. Gurinder Gurinder Garcha Consulting D. Grady Talema Group R. Holub DuPont P. House Thermon Mfg. Co. *B. Johnson Thermon Mfg. Co. R. Johnson Source IEC JUNE 2, 2017 UL 60079-2 8 Table Continued on Next PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Table Continued NAME COMPANY *P. Kelly UL LLC S. Kiddle ABB Inc *P. Kovscek Industrial Scientic Corp. A. Kreider Phoenix Contact Development & Manufacturin
