UL 21
Standard for LP-Gas Hose

DETAILS
Edition Number:11SCC Approved:--
Edition Date:2014-12-15DOD Approved: --
Price Code:CANSI Approved: 2017-07-27
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements cover hose and hose assemblies in sizes up to and including a nominal internal diameter of 4 in (102 mm) for conveying liquefied petroleum gas (LP-Gas) intended to be installed in closed systems in compliance with the Standard of the National Fire Protection Association Liquefied Petroleum Gas Code, NFPA 58 . The hose or hose assembly is intended for a maximum working pressure of 350 pounds per square inch gauge (psig) (2400 kPa) for use at temperatures within the range of minus 40°C (minus 40°F) to plus 60°C (140°F), or minus 54°C (minus 65°F) to plus 60°C. Hose and hose assemblies in sizes larger than 2 in (50.8 mm) are not intended for use on reels.

    1.2 This standard does not apply to:

    a) Flexible hose connectors for LP-Gas that are investigated under the Standard for Pigtails and Flexible Hose Connectors for LP-Gas, UL 569;

    b) Gas appliance connectors for handling fuel gases at 5 psig (34.5 kPa) or less, which are investigated under Connectors for Gas Appliances, ANSI Z21.24, nor to metallic hose intended for use in oil transportation piping, in petroleum refinery piping, or in gas transmission and distribution piping systems; or

    c) Hose intended for use in automotive applications or hose intended for use in confined areas.

    d) Hose assemblies that are investigated under Gas Hose Connectors for Portable Outdoor Gas-Fired Appliances, ANSI Z21.54.

  • TABLE OF CONTENTS
    Expand All

    • Cover
    • Transmittal
    • Table of Contents
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 General
            • 2.1 Units of measurement
            • 2.2 Undated references
        • CONSTRUCTION
          • 3 Tube and Cover
          • 4 Reinforcement
          • 5 Inside Diameter
          • 6 Thickness of Tube or Cover
          • 7 Assembly Couplings
        • PERFORMANCE
          • 8 Proof-Pressure Test
            • 8.1 General
            • 8.2 Apparatus
            • 8.3 Method
          • 9 Hydrostatic Strength Test
            • 9.1 General
            • 9.2 Apparatus
            • 9.3 Method
          • 10 Adhesion Test
            • 10.1 General
            • 10.2 Apparatus
            • 10.3 Method
          • 11 Tensile Strength and Elongation Tests
            • 11.1 General
            • 11.2 Apparatus
            • 11.3 Method
          • 12 Accelerated Air-Oven Aging Test
            • 12.1 General
            • 12.2 Method
          • 13 Ozone Exposure
            • 13.1 General
            • 13.2 Apparatus
            • 13.3 Method
          • 14 Repeated Bending Test
            • 14.1 General
            • 14.2 Apparatus
            • 14.3 Method
          • 15 Repeated Bending – Proof Pressure Test
            • 15.1 General
            • 15.2 Apparatus
            • 15.3 Method
          • 16 Permeation Test
            • 16.1 General
            • 16.2 Apparatus
            • 16.3 Method
          • 17 Immersion Tests of Rubber Tube and Cover
            • 17.1 Tensile strength and ultimate elongation
            • 17.2 Volumetric swelling
          • 18 Low Temperature Test
            • 18.1 General
            • 18.2 Apparatus
          • 19 Pull Force Test
            • 19.1 General
            • 19.2 Apparatus
            • 19.3 Method
          • 20 Moist Ammonia-Air Stress Cracking Test
        • MANUFACTURING AND PRODUCTION TESTS
          • 21 General
        • MARKING
          • 22 General