1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULJune 29, 20121UL 2264DOUTLINE OF INVESTIGATIONFORPORTABLE WATER ELECTROLYSIS TYPE HYDROGEN GENERATORSIssue Number: 1JUNE 29, 2012Summary of TopicsThis is the first issue of the Outline of Investi
2、gation for Portable WaterElectrolysis Type Hydrogen Generators, which covers portable generatorsand component generators for installation in products rated 250 Vmaximum.COPYRIGHT 2012 UNDERWRITERS LABORATORIES INC.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT
3、 PERMISSION FROM ULJUNE 29, 2012UL 2264D2No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTSINTRODUCTION1 Scope .62 Glossary .63 Components 84 Units of Measurement .85 Undated References 8CONSTRUCTION6 General 97 Fluid
4、 Containing Parts .97.1 Materials 97.2 Piping and joints 107.3 Pressure vessels 117.4 Storage tanks .117.5 Pressure-relief valves 117.6 Valves .117.7 Pumps and compressors .128 Protection for Flammable and Explosive Fluids Hazards 138.1 General 138.2 Alternative methods of protection 138.3 Hydrogen
5、gas detection 149 Electrical Insulation 1410 Enclosures .1511 Guards and Protection Against Injury 1512 Components in Electrical Circuits .1612.1 General .1612.2 Internal wiring 1612.3 Motors 1712.4 Switches and motor controllers .1712.5 Capacitors .1712.6 Transformers and power supplies 1713 Electr
6、ical Grounding and Bonding .1814 Electrostatic Discharge (ESD) 1815 Electrical Spacings 1916 Connections to the Source of Electrical Supply .1917 Strain-Relief and Bushings .2018 Control Circuits .2018.1 Safety controls .2018.2 Reliability of safety switches and controls .2118.3 Safety software reli
7、ability 2118.4 Solid-state safety circuit reliability 2118.5 Safety and reliability analysis (FMEA) .2119 Generators Provided with a Connection for Refueling Hydrogen Absorbing Metal Alloy FuelCartridges .22JUNE 29, 2012 UL 2264D 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDIS
8、TRIBUTION WITHOUT PERMISSION FROM ULPERFORMANCE20 General Conditions for Tests .2221 Pressure Strength Tests .2322 External Leakage .2322.1 Hazardous liquid containing portions external leakage test .2322.2 Hazardous gas containing portions .2322.3 Hazardous gas containing portions single source hyd
9、rogen leakage evaluation test .2523 External Hydrogen Leakage 2624 Vibration .2725 Outdoor Use Generators Rain Test .2726 Ratings Test .2726.1 Input test 2726.2 Output gas pressure and flow rate 2827 Temperature Test .2828 Grounding and Bonding of Electrical System .3029 Abnormal Operation .3030 Ove
10、rfill Test 3131 Mold Stress Test .3132 Leakage Current 3133 Dielectric Voltage-Withstand Test .3534 Strain-Relief (External Cords and Power Supply Cords) .3635 Impact Tests .3635.1 General .3635.2 Drop impact .3635.3 Ball impact 3736 Continuity/Static Discharge Tests .4036.1 General .4036.2 Continui
11、ty test .4036.3 Test for accumulation of static electricity 4037 Refueling Connection Endurance Test .4138 Hydrogen Compatibility Test .41MARKINGS39 General 4240 Nameplate .4241 Cautionary Markings 43INSTRUCTIONS42 General 4343 Installation .4444 Operating Instructions .4445 Maintenance Instructions
12、 4446 Safety Instructions 45MANUFACTURING AND PRODUCTION TESTS47 Grounding and Bonding .4648 Dielectric Voltage-Withstand Test .4649 External Leakage System 4750 Hydrostatic Withstand of Pressure Vessels (other than ASME Code U pressure vessels orJUNE 29, 2012UL 2264D4UL COPYRIGHTED MATERIAL NOT AUT
13、HORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULDOT certified cylinders) 47APPENDIX AStandards for ComponentsA1JUNE 29, 2012 UL 2264D 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULINTRODUCTION1 Scope1.1 This outlin
14、e covers portable water electrolysis type gaseous hydrogen generators and componentwater electrolysis type gaseous hydrogen generators for use in portable equipment.1.2 This outline applies to hydrogen generators rated 250 V maximum that are for installation in productsintended for indoor and outdoo
15、r residential and commercial use.1.3 This outline also covers portable hydrogen generators used for refueling of hydrogen absorbing metalalloy fuel cartridges, which are limited in size to a maximum of 100 g of hydrogen storage and a maximumvolumetric capacity of 1 L, and which comply with Annex B o
16、f IEC 62282-6-100.1.4 These products are not intended for use in classified locations.1.5 The generators covered by this standard do not include hydrogen storage pressure vessels.2 Glossary2.1 For the purpose of this outline, the following definitions apply.2.2 AMBIENT TEMPERATURE AND PRESSURE For t
17、esting purposes of this outline, ambienttemperature is 25C (77F) and ambient pressure is 1 atm.2.3 CLASSIFIED LOCATION Location where the concentration of flammable vapors, liquids or gasesare, or may be, present in quantities sufficient to produce explosive or ignitable mixtures.2.4 HYDROGEN EMBRIT
18、TLEMENT Deleterious changes in the physical properties of metalsproduced by contact with hydrogen.2.5 LOWER EXPLOSION LIMIT (LEL) The lowest volume percentage of flammable gas in air thatwill explode.Note: The range of volume ratio of hydrogen in air that will form a flammable atmosphere is moreexte
19、nsive then the range that will form an explosive atmosphere. The flammability limits are used in thisoutline to provide the maximum protective measures.2.6 LOWER FLAMMABILITY LIMIT (LFL) The lowest volume percentage of flammable gas in air thatwill ignite.Note: The range of volume ratio of hydrogen
20、in air that will form a flammable atmosphere (4 - 75 volume%) is more extensive then the range that will form an explosive atmosphere (18.3 - 59 volume %).Therefore the flammability limits are used in this outline to provide the maximum protective measures.2.7 MAXIMUM ALLOWABLE WORKING PRESSURE (MAW
21、P) The maximum gauge pressure that apart or system is allowed to operate at, and is the operating pressure of the pressure relief devicesinstalled to protect the part or system against overpressure.2.8 MAXIMUM OPERATING PRESSURE (MOP) The maximum pressure developed in a part undernormal operating co
22、nditions. This value is typically controlled by limit controls, such as pressureswitches, and is set to a maximum value of 10% less than the start-to-discharge pressure of thepressure-relief device for that part.JUNE 29, 2012UL 2264D6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR
23、DISTRIBUTION WITHOUT PERMISSION FROM UL2.9 PORTABLE Not secured in place or physically attached and able to be moved about.2.10 PRIMARY SAFETY CONTROL A control whose failure would affect the safety of the hydrogengenerator as determined by the safety analysis.2.11 RESIDENTIAL An occupancy that prov
24、ides sleeping accommodations for purposes other thanhealth care or detention and correctional.2.12 ZONE SYSTEM OF CLASSIFICATION The means for classifying areas within the hydrogengenerator system in accordance with Article 505 of the National Electrical Code, ANSI/NFPA 70, andthe methods outlined i
25、n Electrical Apparatus for Explosive Gas Atmospheres Part-10: Classification ofHazardous Areas, IEC 60079-10. The potential zones of this system are: Class I, Zone0Alocation in which ignitable concentrations of flammable gases or vaporsare present continuous or ignitable concentrations of flammable
26、gases or vapors are present forlong periods of time. Class I, Zone1Alocation:a) In which ignitable concentrations of flammable gases or vapors are likely to existunder normal operating conditions; orb) In which ignitable concentrations of flammable gases or vapors may exist frequentlybecause of repa
27、ir or maintenance operations or because of leakage; orc) In which equipment is operated or processes are carried on of such a nature thatequipment breakdown or fault operations could result in the release of ignitableconcentrations of flammable gases or vapors and also cause simultaneous failure ofe
28、lectrical equipment in a mode to cause the electrical equipment to become a source ofignition; ord) That is adjacent to a Class I, Zone 0 location from which ignitable concentrations ofvapors could be communicated, unless communication is prevented by adequatepositive pressure ventilation from a sou
29、rce of clean air and effective safeguards againstventilation failure are provided. Class I, Zone2Alocation:a) In which ignitable concentrations of flammable gases or vapors are not likely tooccur in normal operation and if they do occur, will exist only for a short period; orb) In which volatile fla
30、mmable liquids, flammable gases or flammable vapors arehandled, processed, or used, but in which the liquids, gases or vapors normally areconfined within closed containers of closed systems from which then can escape onlyas a result of accidental rupture or breakdown of the containers or system or a
31、s a resultof abnormal operation of the equipment with which the liquids or gases are handled,processed, or used; orc) In which ignitable concentrations of flammable gases or vapors normally areprevented by positive mechanical ventilation, but which may become hazardous asresult of failure or abnorma
32、l operation of the ventilation equipment; orJUNE 29, 2012 UL 2264D 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULd) That is adjacent to a Class I, Zone 1 location from which ignitable concentrations offlammable gases or vapors could be comm
33、unicated, unless such communication isprevented by adequate positive-pressure ventilation from a source of clean air andeffective safeguards against ventilation failure are provided.3 Components3.1 Except as indicated in 3.2, a component of a product covered by this outline shall comply with therequ
34、irements for that component. See Appendix A for a list of standards covering components used in theproducts covered by this outline.3.2 A component is not required to comply with a specific requirement that:a) Involves a feature or characteristic not required in the application of the component in t
35、heproduct covered by this outline, orb) Is superseded by a requirement in this outline.3.3 A component shall be used in accordance with its rating established for the intended conditions ofuse.3.4 Specific components are incomplete in construction features or restricted in performance capabilities.S
36、uch components are intended for use only under limited conditions, such as certain temperatures notexceeding specified limits, and shall be used only under those specific conditions.4 Units of Measurement4.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory
37、 orapproximate information.5 Undated References5.1 Any undated reference to a code or standard appearing in the requirements of this outline shall beinterpreted as referring to the latest edition of that code or standard.JUNE 29, 2012UL 2264D8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPROD
38、UCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONSTRUCTION6 General6.1 A hydrogen generator shall employ materials found by investigation to be acceptable for the intendedapplication.7 Fluid Containing Parts7.1 Materials7.1.1 Fluid containing parts shall be suitable for the application.7.1.2 A par
39、t employed to contain flammable and hazardous fluids shall be resistant to the action of thefluid being handled.7.1.3 Metallic parts containing hydrogen gas shall be resistant to hydrogen embrittlement as outlined inBasic Considerations for the Safety of Hydrogen Systems, ISO 15916. If employing a m
40、aterial other thanas outlined in ISO 15916, an evaluation for susceptibility to hydrogen embrittlement will need to beconducted in accordance with the Standard Test Method for Determination of Susceptibility of Metals toEmbrittlement in Hydrogen Containing Environments at High Pressure, High Tempera
41、ture, or Both, ASTMG 142, or the Standard Test Method for Determination of the Susceptibility of Metallic Materials toGaseous Hydrogen Embrittlement, ASTM F 1459. Results of testing done in accordance with ASTM G142 shall be at least one. Ratios below one indicate a susceptibility to hydrogen embrit
42、tlement with thetest method outlined in ASTM G 142. Ratios above two indicate a susceptibility to hydrogen embrittlementwith the test method outlined in ASTM F 1459.7.1.4 When corrosion of a metallic part containing liquid interferes with its intended function or permitsexternal leakage of a the liq
43、uid and a potential hazard, the part shall be made of corrosion-resistantmaterial or be provided with a corrosion-resistant protective coating in accordance with the corrosionresistance requirements in the Standard for Enclosures for Electrical Equipment, UL 50.7.1.5 An elastomeric part, relied upon
44、 for safety of a liquid containing part, such as a seal betweenelectrical and wetted parts, shall be suitable for the application as determined by the tensile strength andelongation after oven aging and volume change and extraction after immersion tests outlined in theStandard for Gaskets and Seals,
45、 UL 157.7.1.6 The immersion shall be for 168 h in liquids representative of intended application with no volumechange limits greater than 1/+25 % and no extraction (weight loss) greater than 10% of the originalvalues.7.1.7 Thermoplastic parts (other than elastomeric parts) in contact with liquids, w
46、hose deterioration wouldcreate a hazard, shall be subjected to an immersion test in accordance with the Standard Practices forEvaluating the Resistance of Plastics to Chemical Reagents, Practice A, Immersion Test, Procedure I Weight and Dimension Changes, ASTM D543. As a result of the immersion, the
47、re shall be no volumechange greater than 2% or weight change in excess of 10/+25 % of the original values.JUNE 29, 2012 UL 2264D 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL7.1.8 An elastomeric part employed as a seal for hydrogen, shall
48、be suitable for that application as notedin Annex C of Basic Considerations for the Safety of Hydrogen Systems, ISO 15916. The material shallbe evaluated for tensile strength and elongation as received and after oven aging (based upon servicetemperatures) in accordance with the Standard for Gaskets
49、and Seals, UL 157. If employed in outdoor useequipment, it shall be subjected to a low temperature evaluation in accordance with UL 157.7.1.9 Valves, compressors, pumps, piping and other components such as gauges, pressure and/or floatswitches and check valves located in the hydrogen or electrolyte system shall be determined suitable forthe application as outlined in 7.2 7.7 and 12 and comply with the appropriate component standardsidentified in those sections and Appendix A.7.2 Piping and joints7.2.1 Piping and joints employed for flammab
