UL 252
Standard for Compressed Gas Regulators

DETAILS
Edition Number:10SCC Approved:--
Edition Date:2017-09-15DOD Approved: 1988-09-26
Price Code:BANSI Approved: 2017-09-14
Type:ulstd

  • SCOPE

    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.

    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 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 requirements of the Liquefied 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 flow characteristics of the regulator, and the physiological effects of regulators to be used with medical gases.

  • TABLE OF CONTENTS
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    • Cover
    • Transmittal
    • Table of Contents
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 Components
          • 3 Units of Measurement
          • 4 Undated References
          • 5 Glossary
        • CONSTRUCTION
          • 6 Assembly
          • 7 Materials
          • 8 Connections
          • 9 Accessories
        • PERFORMANCE
          • 10 General
          • 11 Torque Test
          • 12 Seat- and External-Leakage Test
          • 13 Excess-Pressure Test
          • 14 Endurance Test
          • 15 Volume-Change and Weight-Loss Tests
            • 15.1 General
            • 15.2 Tests using n-Hexane and IRM 903 Oil
            • 15.3 Tests using liquid MPS
          • 16 Accelerated-Aging Test
          • 17 Accelerated Aging Test for Nonmetallic Bonnet Bodies
          • 18 Accelerated Hydrogen-Pressure Aging Test
          • 19 Comparative Corrosion Tests
            • 19.1 General
            • 19.2 Tests in the presence of salt spray (fog)
            • 19.3 Tests in the presence of moist hydrogen sulfide-air mixture
            • 19.4 Tests in the presence of moist sulfur dioxide-carbon dioxide-air mixture
        • MANUFACTURING AND PRODUCTION TESTS
          • 20 General
        • MARKINGS
          • 21 General
        • INSTRUCTIONS
          • 22 General
    • OXYGEN AND ACETYLENE WELDING REGULATORS FOR USE UNDER FEDERAL AGENCY REGULATIONS
    • APPENDIX A