Leaking equipment, such as valves, pumps, and connectors, are a large source of emissions of volatile organic compounds (VOCs) and volatile hazardous air pollutants (VHAPs)

The Leak Detection and Repair: A Best Practices Guide - is intended for use by regulated entities, such as petroleum refineries and chemical manufacturing facilities, as well as compliance inspectors. The guide details some of the problems identified with leak detection and repair (LDAR) programs. It focuses on Method 21 requirements, and describes the practices that can be used to increase the effectiveness of an LDAR program.

• Leak Detection and Repair: A Best Practices Guide (PDF)(52 pp, 1 MB, October 2007)