1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 252 Compressed Gas RegulatorsUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPR
2、ODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Compressed Gas Regulators, UL 252 Ninth Edition, Dated September 16, 2010 SUMMARY OF TOPICS This revision of ANSI/UL 252 includes additional requirements for backpressure regulators. The new and revised requirements are s
3、ubstantially in accordance with Proposal(s) on this subject dated October 3, 2014. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. Changes in requirements are marked with a vertical line in the margin and are foll
4、owed by an effective date note indicating the date of publication or the date on which the changed requirement becomes effective. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, electronic, mechanical photocop
5、ying, recording, or otherwise without prior permission of UL. UL provides this Standard as is without warranty of any kind, either expressed or implied, including but not limited to, the implied warranties of merchantability or tness for any purpose. In no event will UL be liable for any special, in
6、cidental, 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 inability to use this Standard, even if UL or an authorized UL representative has been advised of the possibility of such damage. In no eve
7、nt 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 Standards for Safety agree to defend, indemnify, and hold UL harmless from and against any loss, expense, liability, damage, claim, or judg
8、ment (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. The requirements in this Standard are now in effect, except for those paragraphs, sections, tables, gures, and/or other ele
9、ments of the Standard having future effective dates as indicated in the note following the affected item. 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. JANUARY 28, 201
10、5 UL 252 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JANUARY 28, 2015 UL 252 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL SEPTEMBER 16, 2010 (Title
11、Page Reprinted: January 28, 2015) 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 Edit
12、ion May, 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 16, 2010 This ANSI/UL Standard for Safety consists of the Ninth Edition including revisions through
13、 January 28, 2015. The most recent designation of ANSI/UL 252 as an American National Standard (ANSI) occurred on January 28, 2015. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or effective date information. The Department of Defense (DoD) has adopted
14、UL 252 on September 26, 1988. The publication of 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-Li
15、ne Collaborative Standards Development System (CSDS) at http:/. 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
16、 sole and exclusive property of UL. COPYRIGHT 2015 UNDERWRITERS LABORATORIES INC. ANSI/UL 252-2015UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL SEPTEMBER 4, 2013 COMPRESSED GAS REGULATORS - UL 252 2 No Text on This PageUL COPYRIGHTED MATER
17、IAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .5 2 Components 5 3 Units of Measurement .6 4 Undated References 6 5 Glossary .6 CONSTRUCTION 6 Assembly 7 7 Materials .8 8 Connections 8 9 Accessories .8A PERFORMANCE 10 General .8A
18、10A Torque Test 8B 11 Seat- and External-Leakage Test 9 12 Excess-Pressure Test .10 13 Endurance Test 10 14 Volume-Change and Weight-Loss Tests .12 14.1 General .12 14.2 Tests using n-Hexane and IRM 903 Oil .12 14.3 Tests using liquid MPS 13 15 Accelerated-Aging Test 14 16 Accelerated Aging Test for
19、 Nonmetallic Bonnet Bodies 14 17 Accelerated Hydrogen-Pressure Aging Test 14 18 Comparative Corrosion Tests 15 18.1 General .15 18.2 Tests in the presence of salt spray (fog) 15 18.3 Tests in the presence of moist hydrogen sulde-air mixture .15 18.4 Tests in the presence of moist sulfur dioxide-carb
20、on dioxide-air mixture .16 MANUFACTURING AND PRODUCTION TESTS 19 General 16 MARKINGS 20 General 16 INSTRUCTIONS 21 General 17 JANUARY 28, 2015 COMPRESSED GAS REGULATORS - UL 252 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL SUPPLEMENT SA
21、- OXYGEN AND ACETYLENE WELDING REGULATORS FOR USE UNDER FEDERAL AGENCY REGULATIONS INTRODUCTION SA1 Scope SA1 SA2 Glossary SA1 CONSTRUCTION SA3 General SA1 SA4 Connections SA2 SA5 Relief Valves SA3 SA6 Pressure Gauges SA3 PERFORMANCE SA7 General SA3 SA8 Performance Characteristics Test SA4 SA9 Press
22、ure Regulation Test .SA4 SA10 Flow Regulation Test .SA4 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 Tests SA7 APPENDIX A Standards for ComponentsA1 SEPTEMBER 16, 2010 COMPRESSE
23、D GAS REGULATORS - UL 252 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED 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
24、not more than 5500 psig (37.91 MPa) to the use pressure. 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
25、 intended for use in accordance with the Standard for the 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 requ
26、irements of the Liqueed Petroleum Gas Code, NFPA 58. Such 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 re
27、gulators to be used with medical gases. 2 Components 2.1 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
28、A component is not required to comply with a specic requirement 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 w
29、ith its rating established for the intended conditions of 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 s
30、hall be used only under those specic conditions. SEPTEMBER 16, 2010 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
31、in parentheses are explanatory or approximate information. 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 b
32、e interpreted as referring to the latest edition of that 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
33、are stable because of their composition or because of the conditions of storage. 5.3 INERT GAS Helium, neon, argon, krypton, xenon and radon are evaluated as inert gases. 5.3.1 REGULATOR, BACKPRESSURE A valve that is installed at the end of a system to provide an obstruction to ow and regulate upstr
34、eam (back) pressure. 5.3.1 added January 28, 2015 5.4 REGULATOR, CYLINDER A regulator provided 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 press
35、ure. 5.5 REGULATOR, LINE, A regulator that is provided with threaded inlet ports intended to be installed in a compressed gas system to reduce the source pressure to the use pressure. 5.5.1 REGULATOR, PRESSURE A valve that is installed at the beginning of a system or before pressure sensitive equipm
36、ent to regulate or reduce higher upstream pressure. 5.5.1 added January 28, 2015 5.6 REGULATOR, STATION A regulator that 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 (138
37、0 kPa) to the use pressure. 5.7 REGULATOR CLASS Denes the maximum end use pressure for the product based on the gas pressure 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. 5.7
38、revised January 28, 2015 JANUARY 28, 2015 COMPRESSED GAS REGULATORS - UL 252 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR 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-
39、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 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, 89
40、0, 910, 930, 940, 950, 960, 965 VI 4000 27.58 CGA No. 577 VII 5500 37.92 CGA Nos. 347, 680, 695, 701 5.8 REMOVABLE Capable of being removed using ordinary hand tools and an opening created by the removal shall be capable of being plugged using are ttings or pipe plugs. 5.9 RUPTURE A fracture in an e
41、xternal component of the product. CONSTRUCTION 6 Assembly 6.1 A regulator shall include all of the components required for its intended operation 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
42、 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 oxygen. 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
43、 clockwise increases the regulator outlet pressure. 6.4 A regulator intended to be adjusted by the user shall be constructed so that the diaphragm spring cannot be compressed to its solid height. SEPTEMBER 16, 2010 COMPRESSED GAS REGULATORS - UL 252 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHE
44、R 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 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
45、(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 material, such as stainless steel or brass, or be provided with a corrosion-resistant protective coating. 7.4 A protective coating shall provide resistance a
46、gainst 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 Zinc 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 zi
47、nc 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 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
48、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 parts 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
49、greater than 435 psig (3000 kPa) to the use pressure. 7.9 effective September 9, 2011 8 Connections 8.1 A regulator intended for attachment to a gas storage cylinder shall be 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. Exception: The inlet ttings may comply with the r
