7 Del. Admin. Code § 1352-B-2.0

Current through Register Vol. 28, No. 7, January 1, 2025

Section 1352-B-2.0 - Design and Construction Requirements for New Metallic Field-Constructed ASTs

2.1 General Requirements for Design and Construction of New Metallic Field-Constructed ASTs

2.1.1 All new metallic Field-Constructed ASTs that will contain Regulated Substances shall:

2.1.1.1 Be of welded construction.

2.1.1.2 Meet or exceed the following design or manufacturing standards, as applicable:

2.1.1.2.1 API Standard 620, Design and Construction of Large, Welded, Low-Pressure Storage Tanks;

2.1.1.2.2 API Standard 650, Welded Tanks for Oil Storage;

2.1.1.2.3 API Standard 12D, Specification for Field Welded Tanks for Storage of Production Liquids;

2.1.1.2.4 NACE SP0294; Design, Fabrication, and Inspection of Tanks for the Storage of Concentrated Sulfuric Acid and Oleum at Ambient Temperatures;

2.1.1.2.5 NFPA 30, Flammable and Combustible Liquids Code;

2.1.1.2.6 Other standards approved by the Department.

2.1.2 All new metallic Field-Constructed ASTs shall have a suitable foundation capable of supporting the AST full of product or the test media without excessive differential settlement as defined in API 653. The foundation design and construction shall be based on sound engineering practices. The foundation design shall provide positive drainage of water away from the base. ASTs located in areas subject to flooding shall be protected from flotation.

2.1.3 All new metallic Field-Constructed ASTs with tank bottoms in contact with soil shall be protected from corrosion in accordance with Part B, Section 5.0.

2.1.4 All new metallic Field-Constructed ASTs shall be placed on a release prevention barrier. The integrity of the release prevention barrier shall not deteriorate due to exposure to the elements or soil in the presence of regulated substances. The following are acceptable release prevention barriers:

2.1.4.1 An impervious soil layer or geosynthetic clay liner with a permeability of 1 x 10-7 cm/sec or less; or

2.1.4.2 An impervious geosynthetic liner installed in accordance with manufacturer's recommendations such as a 60 mil unreinforced liner, 40 mil reinforced liner, or a material of similar or more stringent specifications that is compatible with the Regulated Substance being stored; or

2.1.4.3 A double bottom with Leak Detection monitoring for the presence of a leak of a regulated substance; or

2.1.4.4 An impervious concrete slab foundation.

2.1.5 All new metallic Field-Constructed ASTs shall have secondary containment installed in accordance with PART B, Section 7.0.

2.1.6 All new metallic Field-Constructed ASTs shall have base line data including:

2.1.6.1 Floor and wall/shell thickness measurements which shall be kept on file by the Owner for the life of the AST and which shall be made available to the Department upon request.

2.1.6.2 Material certifications which shall be kept on file by the Owner for the life of the AST and which shall be made available to the Department upon request.

2.1.7 A report including the welding procedures, welding certification reports, and any non-destructive testing performed on the AST shall be kept on file by the Owner for the life of the AST and which shall be submitted to the Department prior to placing the AST in service.

2.1.8 All new metallic Field-Constructed ASTs constructed for the purpose of storing sulfuric acid or Spent Acid or Spent Caustic or other regulated substances with similar corrosive properties, shall be subject to additional design consideration including NACE Standard SP0294, material compatibility, coating requirements and additional non-destructive examination (NDE).

2.1.9 All new metallic Field-Constructed ASTs shall provide a method of leak detection in accordance with PART B, Section 9.0.

2.1.10 All new metallic Field-Constructed ASTs installed shall be equipped with an overfill prevention and spill containment system in accordance with PART B, Section 8.0.

2.1.11 All ASTs regulated under this Section shall be equipped with normal and emergency venting in accordance with API 2000 and NFPA 30.

2.1.12 All new metallic Field-Constructed ASTs shall be inspected and tested in accordance with API 650 or the design standard(s) under which the AST was constructed as applicable before being placed In Service.

2.1.13 All exposed exterior surfaces of all new metallic Field-Constructed ASTs shall be protected from corrosion.

2.1.14 The completed installation of all new metallic Field-Constructed ASTs is to be inspected and certified by a Certified API 653 Inspector.

7 Del. Admin. Code § 1352-B-2.0

20 DE Reg. 815 (4/1/2017)
27 DE Reg. 536 (1/1/2024) (Final)