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Confidential Draft Hydrogen Fueling Station Performance Validation Testing—DO NOT CITE OR QUOTE <br /> HyStEP Summary Test Report for Linde—Mobile Refueler Hydrogen Station Updated Revision Date:September 29,2023 <br /> CARB comment: We agree with this logic change. We also would like to verify that the station <br /> logic flags intended non-fueling events (i.e. bank switches, leak checks) and pauses the APRR <br /> corridor during these events per J2601-2020 8.3.2. There were no bank switches or fueling leak <br /> checks indicated in the dispenser data fueling state column. J2601 does not require fueling leak <br /> checks or bank switches, but does define them as intended non-fueling events, which are not <br /> included in the main fueling period elapsed time. <br /> Bennett updated us that the dispenser is programmed to flag intended non-fueling events and will <br /> pause the corridor during them. However, during testing the fueling leak checks may have been <br /> disabled and the system was not set to request bank switches. <br /> o Test 18—Ambient temperature limits—dispenser is not programmed to prevent start of fueling if <br /> ambient temperature is greater than 5 degrees C different than fuel temperature. This test is not a <br /> requirement because there is no HGV 4.3 test method for ambient fueling. The dispenser is <br /> programmed to allow 15 seconds of main fueling time before enforcing the requirement that fuel <br /> delivery temperature be within 5 degrees C of ambient temperature. However, during testing the fuel <br /> delivery temperature was consistently > 5 degrees C warmer than ambient temperature, so Bennett <br /> disabled tolerance enforcement to allow us to complete other tests. <br /> Linde comment: During testing, the measured gas temperature was greater than 5C above the <br /> ambient measurement due to solar radiation of the piping. This issue could not be solved during <br /> testing, so Linde had Bennett disable the tolerance enforcement during filling. Linde is currently <br /> developing engineering controls to minimize the impact of solar radiation on the interconnecting <br /> piping to allow this tolerance enforcement to be reenabled. <br /> Table Based Protocol Fueling Tests <br /> • 3 of 3 fueling tests failed. <br /> o Test 15—fuel delivery temperature exceeded +5 degrees C of ambient temperature for entire fill. <br /> o Test 20—fuel delivery temperature exceeded +5 degrees C of ambient temperature for entire fill, <br /> final SOC < 95%, dispenser pressure dropped below lower pressure corridor limit for> 15 sec. <br /> o Test 21 —fuel delivery temperature exceeded +5 degrees C of ambient temperature for entire fill, <br /> dispenser pressure dropped below lower pressure corridor limit for> 15s. <br /> 13. Issues during testing that were resolved onsite: <br /> a. Exceeding UPPER APRR Corridor Boundary— Dispenser was initially programmed to terminate fueling <br /> whenever station's pressure exceeded the upper pressure corridor limit within 5 seconds, including the first <br /> 15 seconds excursion allowance that TIR J2601-2010 provides. Bennett added the excursion allowance <br /> of 15 seconds at the beginning of the main fueling event in the PLC. This change has resolved the <br /> issue and allowed testing to continue. <br /> b. Communication was initially not working on dispenser side and station operator fixed the issue. <br /> c. Dispenser terminated one CRC test attempt just before the start of the fill due to failing to meet the minimum <br /> startup time (tstartup) requirement. This provided evidence that the dispenser continuously monitors the <br /> startup time. <br /> 5 <br /> Page 14 of 38 <br />