# COMAR Title 26 — Department of the Environment

## Subtitle 10 — Oil Pollution Control and Storage Tank Management

### Chapter 17 — Shop-Fabricated Aboveground Storage Tanks

#### Regulation .11 Normal and Emergency Venting.

*COMAR 26.10.17.11*

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

    (a) UL 142 “Standard for Safety, Steel Aboveground Tanks for Flammable and Combustible Liquids”; or

    (b) API Standard 2000 “Venting Atmospheric and Low-pressure Storage Tanks”;

  (2) The normal venting requirements for ASTs listed in NFPA 30 “Flammable and Combustible Liquids Code”; and

  (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.

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

    (a) UL 142 “Standard for Safety, Steel Aboveground Tanks for Flammable and Combustible Liquids”; or

    (b) API Standard 2000 “Venting Atmospheric and Low-pressure Storage Tanks”; and

  (2) Emergency venting meets the requirements in NFPA 30 “Flammable and Combustible Liquids Code”.