This guidance manual was revised under the sponsorship of the U.S. Department of Transportation. The manual relies on sources representing the best opinion on the subject at the time of publication. However, it should not be assumed that all acceptable safety measures and procedures are mentioned in this manual. The reader is referred to the Code of Federal Regulations (49 CFR Parts 190-199 and Part 40) for the complete pipeline safety requirements.

The U.S. Department of Transportation (DOT), Pipeline and Hazardous Materials Safety Administration (PHMSA) staff involved in the revision of this manual included:

• Danny McGriff
• Jim Anderson
• Joel Kohler
• Ed Steele
• Dennis Fothergill
• Mahendra Jhala
• Ken Wood
• Richard Sanders
• Steve Horvath

Sponsor Approval:

Stacey Gerard

Associate Administrator for Pipeline Safety

In addition, technical review was conducted by the Directors of the Office of Pipeline Safety’s five regional offices and the National Association of Pipeline Safety Representatives (NAPSR), as well as other OPS Headquarters’ regulatory, compliance, and program support staff.

This document is accessible via the Internet on http://ops.dot.gov or http://tsi.dot.gov.

This document may be reprinted without permission from the Office of Pipeline Safety.

Any comments, suggestions or revisions should be sent to the Division Manager, Pipeline Safety Division, Transportation Safety Institute, DTI-60, 6500 S. MacArthur Blvd., Oklahoma City, OK, 73169.

Revised - May, 2002