UL 1746:3ED 2007-01

FOREWORD
INTRODUCTION
1. Scope
2. General
3. Glossary
CONSTRUCTION
4. General
PART 1 - PREENGINEERED CATHODIC PROTECTION SYSTEMS
CONSTRUCTION
5. Components
6. Cathodic Protection System Assembly
PERFORMANCE
7. Anode Pull and Durability Tests
8. Torque and Pullout Tests for Pressure Wire Connectors
9. Pullout Test for Test Lead
10. Dielectric Coating Tests
11. Tests for Insulating Devices (Bushings and Gaskets)
12. Cathodic Tank Assembly Tests
PART II - COMPOSITE TANKS
CONSTRUCTION
13. Components
PERFORMANCE
14. Physical Properties of Materials Tests
15. Corrosion Evaluation Tests
16. Composite Tank Assembly Tests
PART III - JACKETED TANKS
CONSTRUCTION
17. Components
PERFORMANCE
18. Physical Properties of Materials Tests
19. Corrosion Evaluation Tests
20. Jacketed Tank Assembly Tests
MANUFACTURING AND PRODUCTION TESTS
21. Leakage Tests (All Tanks)
22. Anode Continuity Test
23. Holiday Test
MARKING
24. General
SUPPLEMENT A
IDENTIFICATION TESTS
SA1. General
SA2. Specific Gravity
SA3. Ash Content
SA5. Percent Extractables
SA6. Differential Scanning Calorimetry
SA7. Thermogravimetric Analysis
SA8. Flexural Strength

These revisions to the Standard for External Corrosion Protection Systems for Steel Underground Storage Tanks, UL 1746, include the following: 1. Revisions to the scope section to clarify and update the requirements 2. Revisions to the glossary section to clarify, update, and provide consistency with other underground storage tank standards 3. Addition of a capacity and dimensions section and relocation of the requirements into this section 4. Revisions to the lift lug tests which includes the use of calculations for evaluating lift lugs 5. Deletion of abrasion test 6. Alternative to Lift Lug Test 7. Revision to indentation test for Part IV coated tanks 8. Deletion of terms Type I Tank and Type II Tank 9. Clarification of requirements for FRP matrix (resin & fibers)

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.