1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 1746 External Corrosion Protection Systems for Steel Underground Storage TanksUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COP
2、YRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for External Corrosion Protection Systems for Steel Underground Storage Tanks, UL 1746 Third Edition, Dated January 17, 2007 Summary of Topics These revisions to the Standard f
3、or 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
4、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 t
5、est for Part IV coated tanks 8. Deletion of terms Type I Tank and Type II Tank 9. Clarication of requirements for FRP matrix (resin Flammable and Combustible Liquids Code, NFPA 30; Code for Motor Fuel Dispensing Facilities and Repair Garages, NFPA 30A; International Fire Code, published by the Inter
6、national 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 ins
7、tructions. 1.4 revised December 19, 2014 2 General 2.1 Components 2.1.1 Except as indicated in 2.1.2, a component of a product covered by this standard shall comply with the requirements for that component. 2.1.2 A component is not required to comply with a specic requirement that: a) Involves a fea
8、ture or characteristic not required in the application of the component in the product covered by this standard, or b) Is superseded by a requirement in this standard. DECEMBER 19, 2014 UL 1746 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM U
9、L 2.1.3 A component shall be used in accordance with its rating established for the intended conditions of use. 2.1.4 Specic components are incomplete in construction features or restricted in performance capabilities. Such components are intended for use only under limited conditions, such as certa
10、in temperatures not exceeding specied limits, and shall be used only under those specic conditions. 2.2 Units of measurements 2.2.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. 2.3 Undated references 2.3.1 Any undated refere
11、nce to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. 2.4 Terminology 2.4.1 In the following text, a requirement that applies only to a particular type of tank is so identied by a specic reference in
12、 that requirement to the type or types of tank involved. Absence of such specic reference or use of the term “tank” indicates that the requirement applies to all underground storage tanks unless indicated otherwise. 3 Glossary 3.1 For the purpose of this standard the following denitions apply. 3.1 r
13、evised December 19, 2014 3.1.1 ATMOSPHERIC TANK A storage tank that has been designed to operate at pressures of negative 0.5 psig to 1.0 (negative 3.4 kPa to 6.8 kPa) psig measured at the top of the tank. 3.1.1 added December 19, 2014 3.1.2 CATHODICALLY PROTECTED TANK A steel tank with a pre-engine
14、ered, factory installed galvanic type cathodic protection system consisting of anodes, dielectric coatings, isolated devices and accessories applied to outer tank shell which provides external corrosion protection. Cathodically protected tank requirements are found in Part I. 3.1.2 added December 19
15、 2014 3.1.3 COATED TANK A steel tank with a polyurethane (PUR) layer directly bonded to the exterior of the tank which provides external corrosion protection. The polyurethane (PUR) layer does not provide an interstitial space. Coated tank requirements are found in Part IV. 3.1.3 added December 19,
16、 2014 3.1.4 COMPOSITE TANK A steel tank with a ber reinforced plastic (FRP) layer or laminate directly bonded to the exterior of the tank which provides external corrosion protection. The FRP layer or laminate does not provide an interstitial space. Composite tank requirements are found in Part II.
17、3.1.4 added December 19, 2014 DECEMBER 19, 2014 UL 1746 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3.1.5 HOLIDAY A small fault, crack, pin hole, or other defect in a non metallic dielectric coating, coating, covering or structural laye
18、r, that results in a spark detection when tested with high voltage apparatus as dened in this standard. 3.1.5 added December 19, 2014 3.1.6 INTERSTITIAL SPACE (aka ANNULAR SPACE, INTERSTICE) A space between the walls of a multiple wall tank that is capable of communicating uid from a leak in an adja
19、cent wall to a collection point for monitoring. 3.1.6 added December 19, 2014 3.1.7 JACKETED TANK A steel tank in a ber reinforced plastic (FRP), high density polyethylene (HDPE), polyurea, or polyurethane (PUR) that forms an interstitial space, where the jacket provides secondary containment and ex
20、ternal corrosion protection. Jacketed tank requirements are found in Part III. 3.1.7 added December 19, 2014 3.1.8 PRIMARY CONTAINMENT The ability of an enclosed design or construction to directly contact and contain a liquid while in normal use. 3.1.8 added December 19, 2014 3.1.9 PRIMARY TANK An i
21、nner wall of a tank construction that provides containment of the product being stored. 3.1.9 added December 19, 2014 3.1.10 SECONDARY CONTAINMENT The ability of a design or construction to directly contact and contain a liquid to a minimum of 300 degrees only in abnormal use (from primary containme
22、nt leakage or rupture). 3.1.10 added December 19, 2014 3.1.11 STORAGE TANK (TANK) A vessel having a liquid capacity that exceeds 60 gallons (230 L), is intended for xed installation, and is not used for processing. Reprinted with permission from NFPA 30, Flammable and Combustible Liquids Code, Copyr
23、ight 2003, National Fire Protection Association, Quincy, MA 02169. This reprinted material is not the complete and official position of the National Fire Protection Association on the referenced subject which is presented only by the standard in its entirety. 3.1.11 added December 19, 2014 3.1.12 UN
24、DERGROUND TANK (aka UNDERGROUND STORAGE TANK or UST) A storage tank that is intended for installation at least 12 inches (304.8 mm) below grade and in direct contact with backll. 3.1.12 added December 19, 2014 3.2 deleted December 19, 2014. 3.3 deleted December 19, 2014. 3.4 deleted December 19, 2014. 3.5 deleted December 19, 2014. 3.6 deleted December 19, 2014. DECEMBER 19, 2014 UL 1746 8A
