7000 HARDESON RD 2024-12-30 - Laserfiche WebLink

Confidential Draft Hydrogen Fueling Station Performance Validation Testing—DO NOT CITE OR QUOTE HyStEP Summary Test Report for Linde—Mobile Refueler Hydrogen Station Updated Revision Date:September 29,2023 9. Station uses total mass average temperature measurement method to monitor the fuel delivery temperature during the entire fueling process. 10. Station is designed not to fuel vehicles if the communicated receptacle type (RT) other than H35, e.g., H70. HyStEP operator permanently changed RT from H70 (default) to H35 in the IrDA to resume testing. 11. Station does not fuel vehicles in non-communication mode. However, for a fill that begins with communication and then communication is lost, station uses the non-communication ending pressure table for the associated tank volume, based on the volume that was determined when communication was valid at the start of the fill. Bennett comment: when a fill begins with communication and then communication is lost, J2601 (2010 preliminary) does not give guidance, however, J2601 (2020) Section 8.9.3 does, stating that the station shall determine a new non-communication target pressure based upon a new initial pressure determination. During testing, the original initial pressure and latest ambient temperature was used for the non-communication target pressure. The station logic will be changed so that the latest MP received when communications were lost will be used to compute the non-communications target pressure. Since the non-communications target pressure also depends on the ambient temperature, the latest ambient temperature reading will also be used to establish the non-communications target pressure when communication is lost. CARB comment: The updated logic will satisfy the requirements of J2601-2020, we are satisfied. 4-2L. In communication mode, dispenser does not fuel vehicles if the CHSS initial pressure (PO) is less than 2.0 MPa. Dispenser does not monitor and respond to the measured pressure (MP) prior to the initial connection pulse. fueling.However, the dispenser GOrnpletes the GenneGtien pulse before terminating The dispenser measures the initial pressure during the initial leak check as described in J2601-2020. Bennett comment: see response to item 7.; According to J2601 (2020) Section 8.3.1, measured pressure (MP) below the minimum initial pressure is acceptable if the connection pulse measurement is above the minimum initial pressure. CARB comment: we agree with your assessment and do not have an issue with your implementation of initial pressure measurement. Overall Results Summary General Fault and Communications Tests • Majority of tests passed—except: o Test 11 — Lower Pressure Corridor Limit— It is unclear to CARB staff whether the lower pressure corridor limit is being enforced correctly. We were unable to run this as an individual test (time constraints), but during other tests the dispenser pressure dropped below the lower corridor for>15 seconds without terminating the fill. See tests 20 and 21. The dispenser data does not indicate any intended non-fueling time during these fills, although pauses in flow did occur. For the Table Based protocol, dispenser should pause the APRR corridor ramp during intended non-fueling time, which may have allowed these fills to not violate the lower corridor limit, but Bennett's own fueling graphs do not show APRR corridor pauses. Bennett comment: (Test 11, Test 20) Lower Pressure Corridor Limit. The station was not checking the lower pressure corridor limit when the mass flow was 0. When mass flow returned, the pressure was restored above the lower corridor limit in less than 15 seconds. The station logic will be revised to always check the lower corridor limit while fueling is intended. 4 Page 13 of 38