1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 252 Compressed Gas Regulators STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORI
2、ZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Compressed Gas Regulators, UL 252 Tenth Edition, Dated September 15, 2017 SUMMARY OF TOPICS This tenth edition of the Standard for Safety for Compressed Gas Regulators, UL 252, is being published to re
3、ect the latest ANSI recognition date and to incorporate the following changes in requirements: 1. Addition of types of connections on the regulators The new and revised requirements are substantially in accordance with Proposal(s) on this subject dated July 28, 2017. All rights reserved. No part of
4、this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, electronic, mechanical photocopying, recording, or otherwise without prior permission of UL. UL provides this Standard as is without warranty of any kind, either expressed or implied, including
5、 but not limited to, the implied warranties of merchantability or tness for any purpose. In no event will UL be liable for any special, incidental, consequential, indirect or similar damages, including loss of prots, lost savings, loss of data, or any other damages arising out of the use of or the i
6、nability to use this Standard, even if UL or an authorized UL representative has been advised of the possibility of such damage. In no event shall ULs liability for any damage ever exceed the price paid for this Standard, regardless of the form of the claim. Users of the electronic versions of ULs S
7、tandards 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 Standard on the purchasers co
8、mputer system. SEPTEMBER 15, 2017 UL 252 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL SEPTEMBER 15, 2017 UL 252 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION
9、FROM UL SEPTEMBER 15, 2017 1 UL 252 Standard for Compressed Gas Regulators The rst and second editions were titled Standard for Pressure Regulators or Reducing Valves and numbered UL 252C. The third and fourth editions were titled Gas Pressure Regulators. First Edition March, 1928 Second Edition May
10、, 1951 Third Edition August, 1960 Fourth Edition May, 1973 Fifth Edition December, 1979 Sixth Edition June, 1984 Seventh Edition April, 1996 Eighth Edition October, 2003 Ninth Edition September, 2010 Tenth Edition September 15, 2017 This ANSI/UL Standard for Safety consists of the Tenth Edition. The
11、 most recent designation of ANSI/UL 252 as an American National Standard (ANSI) occurred on September 14, 2017. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, and Title Page. The Department of Defense (DoD) has adopted UL 252 on September 26, 1988. The publication o
12、f revised pages or a new edition of this Standard will not invalidate the DoD adoption. 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 (
13、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 and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT
14、2017 UNDERWRITERS LABORATORIES INC. ANSI/UL 252-2017UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL SEPTEMBER 15, 2017 COMPRESSED GAS REGULATORS - UL 252 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION O
15、R DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .5 2 Components5 3 Units of Measurement .6 4 Undated References 6 5 Glossary .6 CONSTRUCTION 6 Assembly 7 7 Materials .8 8 Connections 8 9 Accessories 9 PERFORMANCE 10 General.9 11 Torque Test 10 12 Seat- and External-Leakage Te
16、st .11 13 Excess-Pressure Test .12 14 Endurance Test 12 15 Volume-Change and Weight-Loss Tests .13 15.1 General .13 15.2 Tests using n-Hexane and IRM 903 Oil .13 15.3 Tests using liquid MPS14 16 Accelerated-Aging Test 15 17 Accelerated Aging Test for Nonmetallic Bonnet Bodies 15 18 Accelerated Hydro
17、gen-Pressure Aging Test 15 19 Comparative Corrosion Tests 15 19.1 General .15 19.2 Tests in the presence of salt spray (fog) 16 19.3 Tests in the presence of moist hydrogen sulde-air mixture .16 19.4 Tests in the presence of moist sulfur dioxide-carbon dioxide-air mixture.16 MANUFACTURING AND PRODUC
18、TION TESTS 20 General16 MARKINGS 21 General17 INSTRUCTIONS 22 General18 SEPTEMBER 15, 2017 COMPRESSED GAS REGULATORS - UL 252 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL SUPPLEMENT SA - OXYGEN AND ACETYLENE WELDING REGULATORS FOR USE UN
19、DER FEDERAL AGENCY REGULATIONS INTRODUCTION SA1 Scope SA1 SA2 GlossarySA1 CONSTRUCTION SA3 General SA1 SA4 Connections SA2 SA5 Relief Valves SA3 SA6 Pressure Gauges SA3 PERFORMANCE SA7 General SA3 SA8 Performance Characteristics TestSA4 SA9 Pressure Regulation Test .SA4 SA10 Flow Regulation Test .SA
20、4 SA11 Static Increment (Lock-Up) Test SA5 SA12 Flow Capacity Test .SA5 SA13 Proof Pressure Test SA6 SA14 Burst Pressure Test.SA6 SA15 Endurance Test SA6 SA16 Immersion TestsSA7 APPENDIX A Standards for ComponentsA1 SEPTEMBER 15, 2017 COMPRESSED GAS REGULATORS - UL 252 4UL COPYRIGHTED MATERIAL NOT A
21、UTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover regulators used to reduce the pressure of compressed industrial gases from a source or storage cylinder pressure of not more than 5500 psig (37.91 MPa) to the use pressure.
22、 1.2 Regulators covered by these requirements are intended for use with compressed gases such as air, carbon dioxide, inert gases, fuel gases, nitrogen, nitrogen oxide, and oxygen. 1.3 Regulators for welding, cutting, and heating operations are intended for use in accordance with the Standard for th
23、e Design and Installation of Oxygen-Fuel Gas Systems for Welding, Cutting, and Allied Processes, NFPA 51. 1.4 These requirements do not cover: a) LP-Gas pressure regulators for equipment intended for installation and use in accordance with requirements of the Liqueed Petroleum Gas Code, NFPA 58. Suc
24、h regulators are evaluated under the Standard for LP-Gas Regulators, UL 144. b) Regulators for handling liquids under cryogenic temperatures. c) The regulating performance ow characteristics of the regulator, and the physiological effects of regulators to be used with medical gases. 2 Components 2.1
25、 Except as indicated in 2.2, a component of a product covered by this standard shall comply with the requirements for that component. See Appendix A for a list of standards covering components used in the products covered by this standard. 2.2 A component is not required to comply with a specic requ
26、irement that: a) Involves a feature or characteristic not required in the application of the component in the product covered by this standard, or b) Is superseded by a requirement in this standard. 2.3 A component shall be used in accordance with its rating established for the intended conditions o
27、f use. 2.4 Specic components are incomplete in construction features or restricted in performance capabilities. Such components are intended for use only under limited conditions, such as certain temperatures not exceeding specied limits, and shall be used only under those specic conditions. SEPTEMB
28、ER 15, 2017 COMPRESSED GAS REGULATORS - UL 252 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3 Units of Measurement 3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate informatio
29、n. 3.2 Unless otherwise indicated, all voltage and current values mentioned in this standard are root-mean-square (rms). 4 Undated References 4.1 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that
30、 code or standard. 5 Glossary 5.1 For the purpose of this standard the following denitions apply. 5.2 FUEL GAS Acetylene, hydrogen, natural gas, LP-Gas, methylacetylene-propadiene stabilized, and other liqueed and nonliqueed ammable gases that are stable because of their composition or because of th
31、e conditions of storage. 5.3 INERT GAS Helium, neon, argon, krypton, xenon and radon are evaluated as inert gases. 5.4 REGULATOR, BACKPRESSURE A valve that is installed at the end of a system to provide an obstruction to ow and regulate upstream (back) pressure. 5.5 REGULATOR, CYLINDER A regulator p
32、rovided with inlet ttings complying with the Standard for Compressed Gas Cylinder Valve Outlet and Inlet Connections, CGA Pamphlet V-1 and intended to reduce the pressure from that of the cylinder to the use pressure. 5.6 REGULATOR, LINE, A regulator that is provided with threaded inlet ports intend
33、ed to be installed in a compressed gas system to reduce the source pressure to the use pressure. 5.7 REGULATOR, PRESSURE A valve that is installed at the beginning of a system or before pressure sensitive equipment to regulate or reduce higher upstream pressure. 5.8 REGULATOR, STATION A regulator th
34、at is provided with an inlet connection complying with the Pipeline Regulator Inlet Connection Standards, CGA Pamphlet E-3 and intended to reduce a pressure of less than 200 psi (1380 kPa) to the use pressure. 5.9 REGULATOR CLASS Denes the maximum end use pressure for the product based on the gas pr
35、essure or the CGA connection provided on the compressed gas regulator. See Table 5.1. For backpressure regulators the maximum operating pressure is supplied by the manufacturer. SEPTEMBER 15, 2017 COMPRESSED GAS REGULATORS - UL 252 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR
36、DISTRIBUTION WITHOUT PERMISSION FROM UL Table 5.1 Regulator class Class Test pressure, Denition psi (MPa) I 200 1.38 Station type regulator II 375 2.59 LP-Gas or MPS regulator III 500 3.45 CGA Nos. 160, 165, 182, 200, 240, 290, 295, 300, 410, 415, 440, 450, 510, 520, 600, 668, 678, 679 IV 1800 12.41
37、 Carbon dioxide regulator V 3000 20.68 CGA Nos. 110, 170, 180, 280, 296, 320, 326, 330, 346, 350, 500, 540, 555, 580, 590, 660, 670, 705, 860, 870, 880, 890, 910, 930, 940, 950, 960, 965 VI 4000 27.58 CGA No. 577 VII 5500 37.92 CGA Nos. 347, 680, 695, 701 5.10 REMOVABLE Capable of being removed usin
38、g ordinary hand tools and an opening created by the removal shall be capable of being plugged using are ttings or pipe plugs. 5.11 RUPTURE A fracture in an external component of the product. CONSTRUCTION 6 Assembly 6.1 A regulator shall include all of the components required for its intended operati
39、on and installation, and shall be assembled as a single unit. However, a regulator having an external adjusting screw may be shipped with the adjusting screw unassembled and included in the same box with the regulator. 6.2 An inlet lter shall be provided on all regulators intended for use with oxyge
40、n. The lter shall be formed from a noncombustible material. 6.3 A regulator having an external adjusting screw shall be constructed so that turning the screw clockwise increases the regulator outlet pressure. 6.4 A regulator intended to be adjusted by the user shall be constructed so that the diaphr
41、agm spring cannot be compressed to its solid height. SEPTEMBER 15, 2017 COMPRESSED GAS REGULATORS - UL 252 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 7 Materials 7.1 A material in contact with the gas to be handled by a regulator shall
42、 be resistant to the action of such gas. 7.2 Unalloyed copper shall not be used for parts in contact with acetylene or methylacetylene-propadiene stabilized (MPS). 7.3 If atmospheric corrosion of a part interferes with the intended function of a regulator, the part shall be of a corrosion-resistant
43、material, such as stainless steel or brass, or be provided with a corrosion-resistant protective coating. 7.4 A protective coating shall provide resistance against corrosion to a degree not less than that provided by the coatings specied in 7.5. See the Comparative Corrosion Tests, Section 18. 7.5 Z
44、inc plating shall not be less than 0.0005 inch (0.013 mm) thick, except on parts where threads constitute the major portion of the area, in which case the zinc plating shall not be less than 0.00015 inch (0.0038 mm) thick. 7.6 Cadmium plating shall not be used. 7.7 Metal combinations susceptible to
45、galvanic corrosion shall not be used if such corrosion adversely affects the intended operation or strength of a regulator. 7.8 Thread sealing compounds and lubricants shall be compatible with the gas to which they will be exposed in service. 7.9 Aluminum or aluminum alloys shall not be used for par
46、ts in contact with oxygen or oxygen enriched gases, where the percentage of oxygen exceeds 21 percent by volume, on regulators intended to reduce a pressure greater than 435 psig (3000 kPa) to the use pressure. 8 Connections 8.1 A regulator intended for attachment to a gas storage cylinder shall be
47、provided with an inlet connection that conforms with the Standard for Compressed Gas Cylinder Valve Outlet and Inlet Connections, CGA Pamphlet V-1, or, be of the manufacturers own proprietary non-interchangeable gas-specic connection, for the gas involved and it is additionally marked in accordance
48、with 21.1(e). Exception: The inlet ttings may comply with the requirements of a Foreign National Standard for inlet ttings when the compressed gas regulator is tested in accordance with the applicable requirements in Sections 10 20 and it is additionally marked in accordance with 21.1(e). 8.2 Statio
49、n or line regulators shall be provided with either: a) Inlet pipe threads for direct connection to a piping system or b) For welding and cutting equipment, an inlet connection complying with the Pipeline Regulator Inlet Connection Standards of the Compressed Gas Association, CGA Pamphlet E-3, or c) Male 1/4, 3/8, 1/2, or 5/8 in. SAE are connection, or SEPTEMBER 15, 2017 COMPRESSED GAS REGULATORS - UL 252 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DIST
