1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 122701 Requirements for Process Sealing Between Electrical Systems and Flammable or Combustible Process Fluids STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCT
2、ION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Requirements for Process Sealing Between Electrical Systems and Flammable or Combustible Process FluidsUL 122701 Third E
3、dition, Dated May 12, 2017 Summary of Topics This is the third edition of ANSI/UL 122701, the Standard for Requirements for Process Sealing Between Electrical Systems and Flammable or Combustible Process Fluids. The requirements are substantially in accordance with Proposal(s) on this subject dated
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8、toring an electronic Standard on the purchasers computer system. MAY 12, 2017 UL 122701 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MAY 12, 2017 UL 122701 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPR
9、ODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MAY 12, 2017 1 UL 122701 Standard for Requirements for Process Sealing Between Electrical Systems and Flammable or Combustible Process Fluids Third Edition May 12, 2017 This ANSI/UL Standard for Safety consists of the Third Edition. The most recent
10、 designation of ANSI/UL 122701 as an American National Standard (ANSI) occurred on May 12, 2017. ANSI approval for a standard does not include the Cover Page, Transmittal Pages and Title Page. Comments or proposals for revisions on any part of the Standard may be submitted to UL at any time. Proposa
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12、hips, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2017 UNDERWRITERS LABORATORIES INC. ANSI/UL 122701-2017UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MAY 12, 2017 UL 122701 2 No Text
13、on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS Preface (UL) 4 1 Scope .6 2 Units of Measurement .6 3 Undated References 6 4 Glossary .7 5 General Requirements11 5.1 Basis for requirements .11 5.2 Single seal equipment .
14、11 5.3 Dual seal equipment .11 5.4 Equipment with limited pressure at the electrical connections .12 5.5 Purged and pressurized equipment 12 5.6 Add-on secondary seals12 5.7 Annunciators13 6 Type verications and tests .13 6.1 Test sample 13 6.2 Tests for single seal equipment, dual seal equipment wi
15、thout annunciation, and add-on secondary seals without annunciation 13 6.3 Tests for dual seal equipment with annunciation and add-on secondary seals with annunciation 16 6.4 Verication of limited pressure effectiveness 17 7 Marking and Documentation.17 7.1 Marking 17 7.2 Documentation 18 APPENDIX A
16、(normative) MAY 12, 2017 UL 122701 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Preface (UL) The following people served as members of STP 60079 and participated in the review of this standard: NAME COMPANY *B. Zimmermann, Chair R Stahl
17、Inc. *T. Adam FM Approvals LLC R. Allen 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 Part 1: General Requirements CSA C22.1, Canadian Electrical Code, Part I CSA C22.2 No. 30, Explosion-pro
18、of Enclosures for Use in Class I Hazardous Locations CSA C22.2 No. 174, Cables and Cable Glands for Use in Hazardous Locations IEC 60079-10-1, Explosive Atmospheres - Part 10-1: Classication of Areas - Explosive Gas Atmospheres NFPA 70, National Electrical Code MAY 12, 2017 UL 122701 6UL COPYRIGHTED
19、 MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL NFPA 497, Recommended Practice for the Classication of Flammable Liquids, Gases, or Vapors and of Hazardous (Classied) Locations for Electrical Installations in Chemical Process Areas UL 1203, Explosion-Proo
20、f and Dust-Ignition-Proof Electrical Equipment for Use in Hazardous (Classied) Locations UL 2225, Cables and Cable-Fittings for Use in Hazardous (Classied) Locations UL 60079-0, Explosive Atmospheres - Part 0: Equipment - General Requirements UL 60079-2, Explosive Atmospheres - Part 2: Equipment Pro
21、tection by Pressurized Enclosure “p” UL 61010-1, Electrical Equipment for Measurement, Control, and Laboratory Use; Part 1: General Requirements 4 Glossary 4.1 For the purpose of this standard, the following denitions specic to process sealing of electrical equipment apply. See Figures 1 and 2 for a
22、 graphical representation of the various process seal components. This is generated text for gtxt. This is generated text for gtxt. Figure 1 Equipment process sealing components Dual Seal MAY 12, 2017 UL 122701 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT
23、PERMISSION FROM UL 4.2 ADD-ON SECONDARY SEAL A secondary seal intended to be installed between unspecied process connected equipment and the premises wiring system (see Figure 3). This is generated text for gtxt. Figure 2 Equipment process sealing components Single Seal MAY 12, 2017 UL 122701 8UL CO
24、PYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 4.3 AEROSOL Suspension in air or gas of solid or liquid particles. 4.4 ANNUNCIATION Means by which a seal failure is indicated. 4.5 DUAL SEAL EQUIPMENT Equipment which incorporates, along any single
25、 potential leakage path, a primary process seal and one or more secondary process seals such that the failure of two or more independent seals is required to allow migration of process uids from their designed containment into the premises wiring system. Refer to Figure 1. 4.6 EQUIPMENT WITH LIMITED
26、 PRESSURE AT THE ELECTRICAL CONNECTIONS Process connected equipment that is rated for a maximum process pressure of 1.5 kPa (6 inches of water) gauge or is provided with a drain, vent or other means sufficient to prevent pressurizing the premises wiring connection above 1.5 kPa (6 inches of water) i
27、n the event of a failure of the primary process seal. 4.7 PREMISES WIRING (SYSTEM) Power, lighting, control, and signal circuit wiring together with all their associated hardware, ttings, and wiring devices, both permanently and temporarily installed including wiring from the service point or power
28、source to the outlets or wiring from and including the power source to the outlets where there is no service point. NOTE 1 Such wiring does not include wiring internal to appliances, luminaires, motors, controllers, motor control centers, and similar equipment. Figure 3 Add-on secondary seal MAY 12,
29、 2017 UL 122701 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 4.8 PRIMARY PROCESS SEAL A process seal that is directly in contact with process uids under conditions of normal operation. 4.9 PROCESS CONNECTED EQUIPMENT Electrical equipment
30、 that contains a process seal and is intended for connection to an external system that contains process uids. 4.10 PROCESS FLUID A ammable or combustible liquid, vapor or gas that is used in or is a by-product of an industrial process. NOTE 1 For the purposes of this standard, use of the term proce
31、ss uid refers to a ammable process uid. For further information, refer to UL 60079-0 (CAN/CSA C22.2 No. 60079-0), ANSI/ISA 60079-10-1 (IEC 60079-10-1), and NFPA 497. 4.11 PROCESS SEAL A seal between electrical systems and ammable or combustible process uids where a failure could allow the migration
32、of process uids into the premises wiring system. NOTE 1 Although an entire containment system may constitute a potential source of release under unusual conditions, this standard recognizes the concept of infallible containment as dened in UL 60079-2 (CAN/CSA C22.2 No. 60079-2). 4.12 SEAL WITH MOVIN
33、G PARTS A process seal containing structures that, under conditions of normal operation, are capable of motion relative to other parts of the seal. NOTE 1 Examples include seals of shafts and rods that transmit rotary or linear motion into the sealed area. Seals incorporating the following are not c
34、onsidered to be seals with moving parts: a) Thin diaphragms and other structures that may deect when pressurized. b) Vibrating structures such as tuning forks, Coriolis tubes, and vortex sensors. 4.13 SECONDARY PROCESS SEAL A process seal that comes into contact with process uids only in the case of
35、 a primary process seal failure. 4.14 SINGLE SEAL EQUIPMENT Equipment that incorporates, along any single potential leakage path, a single sealing structure such that a failure of the seal would result in the migration of process uids from their designed containment into the premises wiring system.
36、Refer to Figure 2. 4.15 UNSPECIFIED PROCESS CONNECTED EQUIPMENT equipment not assessed in accordance with this document but designed in accordance with applicable standards for the specic type of equipment such as the leakage and rupture from uids under pressure. NOTE 1 Examples of standards that include requirements for a primary seal in a dual seal system include UL 61010-1 (CAN/CSA C22.2 No. 61010-1). MAY 12, 2017 UL 122701 10
