UL 404
Standard for Gauges, Indicating Pressure, for Compressed Gas Service

DETAILS
Edition Number:8SCC Approved:--
Edition Date:2010-10-08DOD Approved: 1994-10-03
Price Code:AANSI Approved: 2015-02-11
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements cover indicating pressure gauges of the elastic element type usually employed in the high-pressure side of regulators or reducing valves used on compressed gas containers or cylinders of oxygen, hydrogen, nitrogen, and other gases. Such gauges usually have pressure ranges of 0 – 1500, 0 – 2000, 0 – 3000, 0 – 4000, 0 – 5000, or 0 – 6000 pounds per square inch (psi) (0 – 10.34, 0 – 13.78, 0 – 20.68, 0 – 27.56, 0 – 34.47, or 0 – 41.36 MPa).

  • 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
        • CONSTRUCTION
          • 5 General
          • 6 Sizes
          • 7 Dials and Pointers
          • 8 Windows
          • 9 Elastic Elements
          • 10 Materials
          • 11 Graduations
        • PERFORMANCE
          • 12 General
          • 13 Accuracy Test
          • 14 Over-Pressure Test
          • 15 Impulse Test
          • 16 Internal Explosion Test
        • MARKING
          • 17 General