What are the considerations for materials used in hydrogen gas transport infrastructure?

Introduction

This FAQ discusses the importance of selecting suitable materials for hydrogen gas transport infrastructure. It highlights the need to evaluate materials for compatibility with hydrogen at the pressures and temperatures seen in the natural gas transportation lines.

Answer

Materials used in natural gas distribution networks are typically not significantly affected by the low pressures and temperatures involved. However, when it comes to hydrogen gas transport infrastructure, materials may be subjected to cracks due hydrogen embrittlement at these conditions. It is essential to consider the potential effects of hydrogen on material degradation in these conditions. There are some guidelines such as API RP 941 that provide valuable guidance for selecting materials that can withstand high-pressure and high-temperature hydrogen environments safely. Whereas, the current standards for safe transporation of hydrogen are yet to provide applicable material limitations for the material selection for such purposes. While the impact of hydrogen on material degradation in natural gas distribution networks is generally considered negligible, it is crucial to assess the compatibility of materials for hydrogen transport infrastructure to ensure safe and reliable operations.