1. A. An owner, an operator, and a person in charge of an AST system with a shop-fabricated AST shall ensure the normal venting for the shop-fabricated AST meets the following requirements:

   1. (1) Design and construct the normal venting in accordance with one of the following industry standards:

      1. (a) UL 142 “Standard for Safety, Steel Aboveground Tanks for Flammable and Combustible Liquids”; or
      2. (b) API Standard 2000 “Venting Atmospheric and Low-pressure Storage Tanks”;
   2. (2) The normal venting requirements for ASTs listed in NFPA 30 “Flammable and Combustible Liquids Code”; and
   3. (3) Vent an atmospheric pressure AST to prevent the development of vacuum or pressure above a 1.0 psi (6.9 kPa) maximum operating pressure.

2. B. An owner, an operator, and a person in charge of an AST system with a shop-fabricated AST shall ensure the emergency venting for the shop-fabricated AST meets the following requirements:

   1. (1) Design and construct emergency venting in accordance with one of the following industry standards:

      1. (a) UL 142 “Standard for Safety, Steel Aboveground Tanks for Flammable and Combustible Liquids”; or
      2. (b) API Standard 2000 “Venting Atmospheric and Low-pressure Storage Tanks”; and
   2. (2) Emergency venting meets the requirements in NFPA 30 “Flammable and Combustible Liquids Code”.

Authority: Environment Article, §§4-401—4-403, 4-405, 4-406, 4-408, 4-410—4-412, 4-415-1—4-418, 4-501, and 4-502, Annotated Code of Maryland

Effective date: June 13, 2022 (49:12 Md. R. 642)