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Are there specific hazards to consider when mixing varied H2 temperature streams (gas and liquid) at a pipe junction, considering the following design features? (1) Cold hydrogen at the pump discharge is directed along two paths. One path uses ambient heat to warm the hydrogen, while the other path bypasses the heater to remain cold. Valves in each stream then adjust the flow split to achieve a controlled hydrogen mix temperature when the streams are recombined. The temperature-controlled stream is then directed to a dispensing station. (2) The hydrogen chilling system combines the cold hydrogen fluid with warmer hydrogen compressed gas to achieve the temperature necessary to provide a fast-fueling experience. The system will monitor the chilled fluid temperature and the vaporized warm gas and combine their streams using mixing valves and controls to provide -40 deg C° gas to the dispensers.

This is a fairly common arrangement and can be acceptable if properly designed. Some considerations:

The main concern is low temperature downstream of the mixing point, in case of mixing valve failure. Perform a LOPA (layer of protection analysis) on the safeguards. A shutdown table showing the action of each shutdown would help with understanding the layers of protection. The…

Category: System Design

Keywords: Fueling Station, Mixing, Temperature

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