UL 1746
Standard for External Corrosion Protection Systems For Steel Underground Storage Tanks

DETAILS
Edition Number:3SCC Approved:--
Edition Date:2007-01-17DOD Approved: --
Price Code:DANSI Approved: --
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements cover pre-engineered corrosion protection systems intended to be factory installed on the exterior surface of steel underground atmospheric-type storage tanks intended for flammable and combustible liquids.


    1.1 revised December 19, 2014

    1.2 These requirements cover the following systems:

    a)    Part i for galvanic-type cathodic protection systems.

    b)    Part ii for fiber-reinforced plastic (FRP) composite systems.

    c)    Part iii for polyurethane (PUR), polyurea, high density polyethylene (HDPE) or fiber-reinforced plastic (FRP) jacketed systems.

    d)    Part iv for polyurethane (PUR) coated systems.


    1.2 revised December 19, 2014

    1.3 These tanks are intended for installation and use in accordance with one or more of the following: Standard for the Installation of Oil-Burning Equipment, NFPA 31; Flammable and Combustible Liquids Code, NFPA 30; Code for Motor Fuel Dispensing Facilities and Repair Garages, NFPA 30A; International Fire Code, published by the International Code Council.


    1.3 revised December 19, 2014

    1.4 These tanks are completely fabricated, inspected and tested for protection system defects and/or tank leakage before shipment from the factory as completely assembled vessels and are intended for burial in accordance with the manufacturers instructions.


    1.4 revised December 19, 2014

  • TABLE OF CONTENTS
    Expand All

    • Cover
    • Transmittal
    • Table of Contents
      • Body
        • Part
          • INTRODUCTION
          • 1 Scope
          • 2 General
            • 2.1 Components
            • 2.2 Units of measurements
            • 2.3 Undated references
            • 2.4 Terminology
          • 3 Glossary
          • CONSTRUCTION
          • 4 General
          • 4A Capacities and Dimensions
          • 5 Compartments
          • 6 Pipe Connections
          • 7 Manways
          • 8 Striker Plates
          • 9 Heating Coils and Hot Wells
          • 10 Tank Accessories, Components, and Special Constructions
        • PART I – PREENGINEERED CATHODIC PROTECTION SYSTEMS
          • CONSTRUCTION
          • 11 Components
            • 11.1 Galvanic anodes
            • 11.2 Backfill materials
            • 11.3 Insulating devices (bushings and gaskets)
            • 11.4 Dielectric coatings test
            • 11.5 Pressure wire connectors
            • 11.6 Test station provision
          • 12 Cathodic Protection System Assembly
            • 12.1 General
            • 12.2 Dielectric coatings
            • 12.3 Electrical isolation devices
            • 12.4 Galvanic anodes
          • PERFORMANCE
          • 13 Anode Pull and Durability Tests
            • 13.1 Anode lead wire pull test
            • 13.2 Anode assembly durability test
          • 14 Torque and Pullout Tests for Pressure Wire Connectors
            • 14.1 General
            • 14.2 Tightening torque
            • 14.3 Pullout test
          • 15 Pullout Test for Test Lead
          • 16 Dielectric Coating Tests
            • 16.1 General
            • 16.2 Impact test following conditioning
            • 16.3 Resistance to external fluids tests
            • 16.4 Flexibility test
            • 16.5 Abrasion resistance test
            • 16.6 Cathodic disbondment test
            • 16.7 Holiday test
          • 17 Tests for Insulating Devices (Bushings and Gaskets)
            • 17.1 General
            • 17.2 Leakage test
            • 17.3 Resistance to automotive fuels test
            • 17.4 Dielectric strength test
            • 17.5 Aging test
            • 17.6 Tensile strength test
          • 18 Cathodically Protected Tank Assembly Tests
            • 18.1 General
            • 18.2 Strength of pipe fittings test – torque
            • 18.3 Strength of pipe fittings test – bending moment
            • 18.4 Lift lug test
            • 18.5 Leakage test
            • 18.6 External pressure test
        • PART II – COMPOSITE TANKS
          • CONSTRUCTION
          • 19 Components
            • 19.1 General
          • PERFORMANCE
          • 20 Physical Properties of Materials Tests
            • 20.1 General
            • 20.2 Air-oven aging
            • 20.3 Coating materials
            • 20.4 Resistance to external fluids test
            • 20.5 Light and water exposure test
            • 20.6 Impact and cold exposure test
          • 21 Corrosion Evaluation Tests
            • 21.1 General
            • 21.2 Corrosion evaluation test
            • 21.3 Permeation/coating dissolution test
          • 22 Composite Tank Assembly Tests
            • 22.1 General
            • 22.2 Strength of pipe fittings test – torque
            • 22.3 Strength of pipe fittings test – bending moment
            • 22.4 Lift lug test
            • 22.5 Tank impact test
            • 22.6 Leakage test
            • 22.7 Tank examination and holiday test
            • 22.8 External pressure test
        • PART III – JACKETED TANKS
          • CONSTRUCTION
          • 23 Components
          • PERFORMANCE
          • 24 Physical Properties of Materials Tests
            • 24.1 General
            • 24.2 Air-oven aging
            • 24.3 Resistance to external and internal fluids test
            • 24.4 Light and water exposure test
            • 24.5 Impact and cold exposure test
          • 25 Corrosion Evaluation Tests
            • 25.1 General
            • 25.2 Corrosion evaluation test
            • 25.3 Permeation/jacket dissolution test
          • 26 Jacketed Tank Assembly Tests
            • 26.1 General
            • 26.2 Strength of pipe fittings test – torque
            • 26.3 Strength of pipe fittings test – bending moment
            • 26.4 Lift lug test
            • 26.5 Tank impact test
            • 26.6 Leakage test
            • 26.7 Tank examination and holiday tests
            • 26.8 Annulus proof-pressure test
            • 26.9 Interstitial communication test
            • 26.10 External pressure test
        • PART IV – COATED TANKS
          • CONSTRUCTION
          • 27 Components
            • 27.1 General
          • PERFORMANCE
          • 28 Physical Properties of Materials and Corrosion Evaluation Tests
            • 28.1 General
            • 28.2 Tensile properties test methods
            • 28.3 Shear strength test method
            • 28.4 As received tensile properties tests
            • 28.5 As received shear strength tests
            • 28.6 Air-oven aging tensile properties shear strength tests
            • 28.7 Abrasion resistance test
            • 28.8 Resistance to external fluids test
            • 28.9 Light and water exposure test
            • 28.10 Impact and cold exposure test
            • 28.11 Corrosion evaluation test
            • 28.12 Permeation/coating dissolution test
            • 28.13 Indentation Test
          • 29 Coated Tank Assembly Tests
            • 29.1 General
            • 29.2 Strength of pipe fittings test – torque
            • 29.3 Strength of pipe fittings test – bending moment
            • 29.4 Lift lug test
            • 29.5 Tank impact test
            • 29.6 Leakage test
            • 29.7 Holiday test
            • 29.8 External pressure test
        • Part
          • MANUFACTURING AND PRODUCTION TESTS
          • 30 Leakage Test (All Tanks)
          • 31 Anode Continuity Test
          • 32 Holiday Test
          • MARKING
          • 33 General
    • Superseded List