The conversion is based on the condition as determined from a variety of non-destructive techniques which are commonly used for pipeline mechanical integrity programs. Existing natural gas pipelines are frequently evaluated for conversion to hydrogen, hydrogen-natural gas blend, and other fluid services.
The conversion can be done safely if handled with the proper expertise and…
Hydrogen has been used as a fuel to operate cars, buses, trucks, submarines, aircraft, forklifts, trains and virtually every type of mobile equipment. Each has special considerations which often drive specific requirements for that vehicle type. For example, higher g-loadings of rail operations and operations within tunnels are a couple considerations, but there are no significant barriers…
All systems must be designed for the applicable operating parameters such as pressure, temperature,
and flow. The sub-cooled liquid hydrogen (sLH2) approach for fueling is comparable to other processes
commonly used to handle cryogenic liquids in the industrial gas industry where remaining gas is
condensed during the fill operation. These processes often operate above the critical…
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,…
Detection systems are nearly always installed but the system design and installation details of detection equipment are up to the manufacturer. Standards are being developed for this market.
Acceptability of materials is highly dependent on the specific application. Applied stress levels, exposure to contaminants, the operating temperature, the partial pressure, and number and magnitude of material stress cycles are some of the factors that affect material selection. Guidance is provided within documents such as ISO 11114, Gas cylinders - Compatibility of cylinder and valve…
Because cast irons are relatively brittle materials, they should generally be avoided in industrial and
transmission pipeline applications. In low pressure applications like residential distribution piping
systems, the use of cast irons is probably acceptable.
Hydrogen affects the mechanical properties of most materials. For example, hydrogen reduces the
fracture toughness and increases the fatigue crack growth rate in steels. There is a significant amount of
research, analytical work, and codes and standards development being undertaken to improve our
understanding of how these materials can be utilized in pipelines. The results of the…
At least three of the ASME B31 piping codes are logical choices:
Considerations for code selection include:
The requirements of the code used for the original construction apply. The piping may meet the requirements of more than one code. In which case, the code used for changing the rating may be different than the original code of construction. In any case, the re-rated system should meet all of the requirements of the selected code. Note that if the original proof test of the system was…
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