UL 331
Standard for Strainers for Flammable Fluids and Anhydrous Ammonia

DETAILS
Edition Number:8SCC Approved:--
Edition Date:2008-02-25DOD Approved: --
Price Code:BANSI Approved: 2017-12-13
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements cover complete, self-contained strainer or filter assemblies intended for use with designated flammable fluids and anhydrous ammonia (fertilizer grade) in residential and commercial fuel-burning, dispensing, and handling facilities. Although these devices are designated strainers, they may be either strainers or filters according to the common terminology of the industry.

    1.2 The term flammable fluids as used in this standard means fuel oil, gasoline, kerosene, and similar petroleum products, liquefied petroleum gas (LP-Gas), and manufactured and natural fuel gas.

    1.3 These requirements do not cover the following:

    a)    Strainers for handling liquids under cryogenic conditions;

    b)    Strainers for marine use;

    c)    Strainers for automotive fuel lines;

    d)    Strainers for handling refrigerants;

    e)    Strainers for use in such facilities as chemical, petrochemical, petroleum, and utility power plants; and

    f)    Strainers for use in fluid-power (hydraulic and pneumatic) applications.

    1.4 Requirements for non-potable water strainers are covered in Supplement sa.


    1.4 added August 1, 2013

  • TABLE OF CONTENTS
    Expand All

    • Cover
    • Transmittal
    • Table of Contents
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 Components
          • 3 Units of Measurement
          • 4 Undated References
        • CONSTRUCTION
          • 5 General
          • 6 Capacity
          • 7 Materials
          • 8 Bodies and Covers
          • 9 Stuffing Boxes
          • 10 Springs
        • PERFORMANCE
          • 11 General
          • 12 Tests On Synthetic-Rubber Parts
          • 13 Deformation and External-Leakage Test
          • 14 Hydrostatic-Strength Test
          • 15 Element-Collapse Test
          • 16 Pressure-Drop Test – Strainers for Oil Burners
          • 17 Clogging Test – Strainers for Oil Burners
          • 18 10-Day Moist Ammonia-Air Stress Cracking Test
        • MANUFACTURING AND PRODUCTION TESTS
          • 19 General
        • MARKING
          • 20 General
    • NON-POTABLE WATER STRAINERSSupplement SA added August 1, 2013