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Valves: High Pressure (33)
Criticality: High
Progress: Addressed, Not Adequately
Score: 20
DOT Relevance:
Description of Key Area
High pressure hydrogen cylinders will require the use of high
pressure valves. Because of problems dealing with high pressures in tubing and
fittings, some of these valves may incorporate regulators.
Discussion of Criticality
Valves are generally required for portable and transportable
applications, as the cylinders valves should be closed during transportation.
High pressures induce high loads on threads and on internal valve and regulator
components. Reliability of valves, regulators, and their components is critical
to safety.
Discussion of Progress
High pressure hydrogen valves, particularly with integrated
regulators, have limited availability and limited field experience.
Recommendations
Field service with these new, high pressure hydrogen valves, with
integrated regulators, needs to be monitored for reliability and safety.
Industry and DOT will need to determine if new or revised standards or
regulations will be required.
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