What is UL 1746A?

UL 1746A is a technical standard that lays out requirements for underground storage tank (UST) systems used for storing petroleum products such as gasoline and diesel fuel. It provides guidelines for the design, construction, installation, and maintenance of these systems to ensure their safety and compliance with regulations.

Design and Construction

The design and construction of UST systems under UL 1746A are critical to prevent leaks and protect the environment from potential contamination. The standard specifies requirements for materials used in tank construction, such as corrosion-resistant steel or fiberglass-reinforced plastic. It also outlines proper installation techniques, including considerations for leakage detection and prevention, venting systems, and overfill protection devices.

Installation and Maintenance

Proper installation and ongoing maintenance play a crucial role in the longevity and safety of UST systems. UL 1746A mandates that tanks be installed by certified professionals who follow approved procedures. Maintenance tasks include regular monitoring of tanks for leaks, periodic inspection of corrosion protection systems, and testing of critical components like leak detectors and spill containment manholes.

Compliance and Certification

Meeting the requirements of UL 1746A is essential for UST system owners and operators to remain in compliance with regulations. Following the standard ensures that the systems are built and maintained to minimize the risk of leakage and environmental contamination. Inspections and certifications conducted by authorized third-party organizations are often required to verify compliance.