What does the EIGA IGC Doc 121/14 recommend for the safe operation of metallic hydrogen pipelines?

Introduction

The EIGA IGC Doc 121/14 “Hydrogen Pipeline Systems” provides guidelines for the safe operation of metallic transmission and distribution piping systems carrying pure hydrogen and hydrogen blends. It offers valuable recommendations for those involved in working with these systems.

Answer

According to the EIGA IGC Doc 121/14 document, several factors need to be considered for the safe operation of hydrogen pipelines. This includes taking into account local conditions, applicable piping codes, material selection, relevant laws and regulations, as well as hazard considerations. The document highlights that hydrogen is a lighter-than-air gas, highly flammable, easily ignited, and does not support breathing. It emphasizes that preventing leaks in hydrogen pipelines can be particularly challenging. The document also identifies two major damage mechanisms, namely hydrogen gas embrittlement internally at ambient temperatures and stress corrosion cracking of line pipes in underground environments externally. It provides guidance on managing stress corrosion cracking using design and inspection techniques similar to those employed for any underground pipeline. The document also offers considerations for various metallic materials, including alloyed steels, stainless steels, nickel alloys, copper and cobalt alloys, as well as general information on plastics.