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

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

      1. (a) NFPA 30 “Flammable and Combustible Liquids Code”; and
      2. (b) An API standard applicable to field-erected ASTs incorporated by reference in COMAR 26.10.01.03; and
   2. (2) 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 field-erected AST shall ensure the emergency venting for the field-erected AST meets the following requirements:

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

      1. (a) NFPA 30 “Flammable and Combustible Liquids”; and
      2. (b) API Standard 2000 “Venting Atmospheric and Low-pressure Storage Tanks”; and

   2. (2) The field-erected AST has one of the following emergency relief venting designs:

      1. (a) A floating roof;
      2. (b) A lifter roof;
      3. (c) A weak roof-to-shell seam; or
      4. (d) Another industry approved pressure-relieving device.

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)