1、 AMERICAN NATIONAL STANDARD ANSI/ISA-60079-1 (12.22.01)-2009 (R2013) Supercedes ANSI/ISA-60079-1 (12.22.01)-2005 Explosive Atmospheres - Part 1: Equipment Protection by Flameproof Enclosures “d” Approved 9 August 2013 Commitment for Amendments This standard is issued jointly by the International Soc
2、iety of Automation (ISA) and Underwriters Laboratories Incorporated (UL). Comments or proposals for revisions on any part of the standard may be submitted to ISA or UL at any time. Revisions to this standard will be made only after processing according to the standards development procedures of ISA
3、and UL. ISA and UL will issue revisions to this standard by means of a new edition or revised or additional pages bearing their date of issue. ISBN: 978-0-876640-31-9 Copyright 2013 By ISA These materials are subject to copyright claims of IEC, ANSI, and ISA. All rights reserved. Not for resale. Pri
4、nted in the United States of America. No part of this publication may be reproduced in any form, including an electronic retrieval system, without the prior written permission of ISA. All requests pertaining to this standard should be submitted to ISA. Copyright 2013 Underwriters Laboratories Incorp
5、orated 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 and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. This ANSI/UL Standard
6、 for Safety consists of the Sixth Edition. The most recent designation of ANSI/UL 60079-1 as an American National Standard (ANSI) occurred on. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page (front and back), or the Preface. The National Difference Page an
7、d 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 UL at any time. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at
8、 http:/. To purchase UL Standards, visit Comm 2000 at http:/m- or call toll-free 1-888-853-3503. International Society of Automation Underwriters Laboratories Inc. ANSI/ISA-60079-1 (12.22.01)-2009 (R2013) ANSI/UL 60079-1 Sixth Edition Sixth Edition Explosive Atmospheres - Part 1: Equipment Protectio
9、n by Flameproof Enclosures “d” This page intentionally left blank. ANSI/ISA-60079-1 ANSI/UL 60079-1 5 General Notes This is the common ISA and UL standard for Explosive Atmospheres - Part 1: Equipment Protection by Flameproof Enclosures “d”. It is the sixth edition of ANSI/ISA-60079-1 (superceding A
10、NSI/ISA-60079-1 (12.22.01)-2005) and the sixth edition of ANSI/UL 60079-1. The document is a modification of the IEC document and includes U.S. deviations encompassing both additions and deletions of information. ANSI/ISA-60079-1 and ANSI/UL 60079-1 contain identical requirements, and identical publ
11、ication dates. The presentation and format of the standards material may differ between the two published standards. This common standard was prepared by the International Society of Automation (ISA) and Underwriters Laboratories Inc. (UL). Although the intended primary application of this standard
12、is stated in its scope, it is important to note that it remains the responsibility of the users of the standard to judge its suitability for their particular purpose. Level of harmonization This standard adopts the IEC text with deviations. The requirements are presented in different formats. The IS
13、A version of the standard illustrates the national differences from the IEC text through the use of legislative text (strike-out and underline). The UL version of the standard illustrates national differences immediately following the IEC text. National differences between the UL version and the ISA
14、 version shall be word for word except for editorial changes. Interpretations The interpretation by the SDO of an identical or equivalent standard shall be based on the literal text to determine compliance with the standard in accordance with the procedural rules of the SDO. If more than one interpr
15、etation of the literal text has been identified, a revision shall be proposed as soon as possible to each of the SDOs to more accurately reflect the intent. UL Effective Date The requirements in this Standard are now in effect, except for those paragraphs, sections, tables, figures, and/or other ele
16、ments of the Standard having future effective dates as indicated in the preface. The prior text for requirements that have been revised and that have a future effective date are located after the Standard, and are preceded by a “SUPERSEDED REQUIREMENTS” notice. New product submittals made prior to a
17、 specified future effective date will be judged under all of the requirements in this Standard including those requirements with a specified future effective date, unless the applicant specifically requests that the product be judged under the current requirements. However, if the applicant elects t
18、his option, it should be noted that compliance with all the requirements in this Standard will be required as a condition of continued Listing, Recognition, Classification, and Follow-Up Services after the effective date, and understanding of this should be signified in writing. This page intentiona
19、lly left blank. ANSI/ISA-60079-1 ANSI/UL 60079-1 7 Preface (ISA) This ISA standard is based on IEC Publication 60079-1. It is the intention of the ISA12 Committee to develop an ANSI Standard that is harmonized with IEC 60079-1 to the fullest extent possible. This preface is included for informationa
20、l purposes and is not part of ANSI/ISA-60079-1. The document is a modification of the IEC document and includes U.S. deviations encompassing both additions and deletions of information. The standards referenced within this document may contain provisions which, through reference in this text, consti
21、tute requirements of this document. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this document are encouraged to investigate the possibility of applying the most recent editions of the standards indicated wit
22、hin this document. Members of IEC and ISO maintain registers of currently valid International Standards. ANSI maintains registers of currently valid U.S. Na tional Standards. This document has been prepared as part of the service of ISA toward a goal of uniformity in the field of instrumentation. To
23、 be of real value, this document should not be static but should be subject to periodic review. Toward this end, the Society welcomes all comments and criticisms and asks that they be addressed to the Secretary, Standards and Practices Board; ISA; 67 Alexander Drive; P. O. Box 12277; Research Triang
24、le Park, NC 27709; Telephone (919) 549 -8411; Fax (919) 549-8288; E-mail: standardsisa.org. The ISA Standards and Practices Department is aware of the growing need for attention to the metric system of units in general, and the International System of Units (SI) in particular, in the preparation of
25、instrumentation standards. The Department is further aware of the benefits to USA users of ISA standards of incorporating suitable references to the SI (and the metric system) in their business and professional dealings with other countries. Toward this end, this Department will endeavour to introdu
26、ce SI-acceptable metric units in all new and revised standards, recommended practices, and technical reports to the greatest extent possible. Standard for Use of the International System of Units (SI): The Modern Metric System, published by the American Society for Testing figures to be deleted are
27、marked with the overlay “X.“ There are nine annexes in this standard. Annexes A, B, C, and E are normative and are considered part of this standard. Annexes D, F, G, H, and I are informative and are not considered part of this standard. This edition contains the following significant technical chang
28、es with regard to the IEC previous edition: a) revisions to Clause 5 regarding markings and conditions of safe use when a dimension of a flameproof joint is other than the relevant minimum or maximum; b) revisions to Table 1 regarding maximum gap for flanged, cylindrical or spigot joints; c) revisio
29、ns to Table 4 regarding requirements for taper threaded joints; d) revisions to Clause 10 regarding volume restrictions and test conditions associated with breathing and draining devices; e) revisions to Clause 11 regarding requirements for fasteners, associated holes and blanking elements; f) revis
30、ions to Clause 12 regarding material restrictions associated with zinc and zinc alloys; g) revisions to Table 5 regarding conditions for the determination of maximum surface temperatures; h) revisions to Clause 15 regarding the determination of explosion pressure (reference pressure); i) revisions t
31、o Table 6 regarding the reduction in length of a threaded joint for non -transmission testing; j) revisions to Table 7 regarding the test factors to increase pressure or test gap ( iE); k) revisions to Table 8 regarding the minimum distance of obstructions from flange openings; l) revisions to Claus
32、e 19 regarding tests for flameproofness; m) revisions to Clause 20 regarding a tabulated collection of marking requirements; n) revisions to Annex C regarding additional requirements for flameproof entry devices; o) revisions to Annex D regarding empty flameproof enclosures as Ex components; p) addi
33、tion of a new Annex F regarding mechanical properties for screws and nuts; and q) addition of a new Annex G regarding equipment protection levels for Ex equipment. This page intentionally left blank. ANSI/ISA-60079-1 ANSI/UL 60079-1 19 1 Scope This part of IEC 60079 standard contains specific requir
34、ements for the construction and testing of electrical equipment with the type of protection flameproof enclosure “d”, intended for use in Class I, Zone 1, explosive gas atmospheres. This standard supplements and modifies the general requirements of IEC 60079-0 ANSI/ISA-60079-0. Where a requirement o
35、f this standard conflicts with a requirement of IEC 60079-0 ANSI/ISA-60079-0, the requirement of this standard will take precedence. NOTE Equipment protection by flameproof enclosures “d” provides Equipment Protection Level (EPL) Gb. For further information, see Annex G. 2 Normative references The f
36、ollowing referenced documents are indispensable for the application of this d ocument. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60061 (all parts), Lamp caps and holders together
37、 with gauges for the control of interchangeability and safety IEC 60079-0:2004, Electrical apparatus for explosive gas atmospheres Part 0: General requirements ANSI/ISA-60079-0:2005, Electrical apparatus for use in Class I, Zones 0, 1, or b) specific drawing referenced that details the dimensions of
38、 the flameproof joints; or c) specific guidance noted to contact the original manufacturer for information on the dimensions of the flameproof joints. The surface of joints may be protected against corrosion. Coating with paint or powder-coat finish is not permitted. Other coating material may be us
39、ed if the material and application procedure have been shown not to adversely affect the flameproof properties of the joint. A corrosion inhibiting grease may be applied to joint surfaces before assembly. The grease, if applied, shall be of a type that does not harden because of ageing, does not con
40、tain an evaporating solvent, and does not cause corrosion of the joint surfaces. Verification of suitability shall be in accordance with the grease manufacturers specifications. Joint surfaces may be electroplated. The metal plating, if applied, shall not be more than 0,008 mm thick. 5.2 Non-threade
41、d joints 5.2.1 Width of joints (L) The width of joints shall not be less than the minimum values given in Tables 1 and 2. The width of joints for cylindrical metallic parts press-fitted into the walls of a metallic flameproof enclosure of a volume not greater than 2 000 cm3 may be reduced to 5 mm, i
42、f the design does not rely only on an interference fit to prevent the part being displaced during the type tests of Clause 15, and 24 ANSI/ISA-60079-1 ANSI/UL 60079-1 the assembly meets the impact test requirements of IEC 60079-0 ANSI/ISA-60079-0, taking the worst-case interference fit tolerances in
43、to account, and the external diameter of the press-fitted part, where the width of the joint is measured, does not exceed 60 mm. 5.2.2 Gap (i) The gap, if one exists, between the surfaces of a joint shall nowhere exceed the maximum values given in Tables 1 and 2. The surfaces of joints shall be such
44、 that their average roughness Ra (derived from ISO 468) does not exceed 6,3 m (250 microinches in accordance with ANSI/ASME B46.1). For flanged joints, there shall be no intentional gap between the surfaces, except for quick -acting doors or covers. For electrical equipment of group I, it shall be p
45、ossible to check, directly or indirectly, the gaps of flanged joints of covers and doors designed to be opened from time to time. Figure 1 shows an example of construction for indirect checking of a flameproof joint. F l a m e p ro o fe n c l o s u reCy l i n d ri c a l d o we ld r i v e n i n t o h
46、 o l eCo v e rW i d t h o f j o i n t Su rf a c e o f c o v e ra n d d o we l s h a l l b ei n t h e s a m e p l a n eLFigure 1 Example of construction for indirect checking of a flanged group I flameproof joint 5.2.3 Spigot joints For the determination of the width L of spigot joints, one of the fo
47、llowing shall be taken into account: the cylindrical part and the plane part (see Figure 2a). In this case, the gap shall nowhere exceed the maximum values given in Tables 1 and 2; the cylindrical part only (see Figure 2b). In this case, the plane part need not comply with the requirements of Tables
48、 1 and 2. NOTE For gaskets, see also 5.4. IEC 541/07 ANSI/ISA-60079-1 ANSI/UL 60079-1 25 1c ffd1LFigure 2a Cylindrical part and plane part Figure 2b Cylindrical part only Key L = c + d (I, IIA, IIB, IIC) c 6,0 mm (IIC) 3,0 mm (I, IIA, IIB) d 0,50 L (IIC) f 1,0 mm (I, IIA, IIB, IIC) 1 interior of enc
49、losure Figure 2 Spigot joints 5.2.4 Holes in joint surfaces Where a plane joint or the plane part or partial cylindrical surface (see 5.2.6) of a joint is interrupted by holes intended for the passage of threaded fasteners for assembling the parts of a flameproof enclosure, the distance l to the edge of the hole shall be equal to or greater than 6 mm when the width of joint L is less than 12,5 mm, 8 mm when the width of joint L is equal to or greater than 12,5 mm but less than 25 mm,
