What piping modifications and other safeguards need to be considered for the use of natural gas – hydrogen blends?

Hydrogen has been transported safely through pipelines for over 50 years. There are dozens of pipeline networks in safe operation globally, with several individual networks that approach up to 1000 miles. 

Significant testing and some demonstration projects are underway to ensure safety. Some of the aspects under investigation include compatibility of the pipe and other materials, effect on odorants, and the need to modify existing residential and industrial equipment. Blending initially is at relatively low levels where its impact on the operations of the existing natural gas distribution system is minimized.