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Making our world <br /> more productive <br /> The Linde Hydrogen Mobile refueler is a small portable style hydrogen fueling station. It <br /> is designed to slowly fill a small number of hydrogen vehicles to support testing and <br /> evaluation of hydrogen vehicles by transit authorities and other potential customers. The <br /> refueler provides all the necessary safety systems of a typical fueling station, but without <br /> the significant infrastructure requirements (power, cooling). The heart of the refueler <br /> contains a standard hydrogen dispenser that has been updated for ambient (uncooled) <br /> hydrogen dispensing according to standard SAE and EU filling protocols. The filling <br /> process and safety systems are fully automated to ensure safe and repeatable fills with <br /> minimal operator training. <br /> The Hydrogen Mobile Dispenser has two basic safety systems. The "Pod" does the basic <br /> "area safety"or"station safety"for the system. There are multiple Hydrogen LEL sensors; <br /> one in the valve cabinet, one in the electrical room, and one located near the Hymera Fuel <br /> Cell. In addition, there are two hydrogen flame scanners located at each end of the pod. <br /> One is intended to point towards the 500 bar tube trailers, and one is pointed toward the <br /> vehicle to be filled. Finally, there is a remote E-STOP button mounted between 25- 75 ft <br /> (regulatory requirement) of the pod. The LELs, Flame Scanners, and E-STOP are relay <br /> interlocked to disconnect all power around the pod and to the dispenser. The relay logic is <br /> self-resetting, so once no flame or hydrogen is detected or E-STOP reset, power will be <br /> restored to the dispenser. (If power is removed from dispenser,the dispenser filling process <br /> would be terminated and would not auto-restart upon power restoration) <br /> The dispenser and associated Siemens PLC mounted to the pod is the primary safety device <br /> to ensure that the system does not overheat or overpressure the hydrogen fuel tanks in a <br /> vehicle. There are internal safety devices in the vehicle, but it is the dispenser that has <br /> primary safety responsibility. The system is fully automated and requires no operator <br /> actions (apart from an E-STOP scenario). There are three basic safety measurements in <br /> the dispenser. The first is an LEL sensor that is located inside the dispenser cabinet. If <br /> this sensor is triggered, the internal power of the dispenser would shut down. The second <br /> and third are the temperature measurements (ambient& hydrogen temperatures) and hose <br /> pressure measurements. The temperatures and pressures are critical measurements which <br /> will be used in conjunction to the filling protocol to ensure that the vehicle tank is not over <br /> pressured or overheated. The Cause &Effect Matrix for the dispenser is shown below. <br /> Page 36 of 38 <br />