Document ID: chunk:federal_register_of_legislation:F2023L01530:body:0:p32
Version: federal_register_of_legislation:F2023L01530
Segment Type: other
Provision Reference: 
Character Range: 90676–94979

shall be reduced, if necessary, to account for vehicle-specific features;
                  (v) As shown in Figure 3 the temperature of the thermocouples in the localized fire exposure area has increased continuously to at least 300 °C within 1 minute of ignition, to at least 600 °C within 3 minutes of ignition, and a temperature of at least 600 °C is maintained for the next 7 minutes. The temperature in the localized fire exposure area shall not exceed 900 °C during this period. Compliance to the thermal requirements begins 1 minute after entering the period with minimum and maximum limits and is based on a 1-minute rolling average of each thermocouple in the region of interest. (Note: The temperature outside the region of the initial fire source is not specified during these initial 10 minutes from the time of ignition.).
         Figure 3
         Temperature profile of fire test
              (c) Engulfing portion of the fire test
              Within the next 2-minute interval, the temperature along the entire surface of the test article shall be increased to at least 800 °C and the fire source is extended to produce a uniform temperature along the entire length up to 1.65 m and the entire width of the test article (engulfing fire). The minimum temperature is held at 800 °C, and the maximum temperature shall not exceed 1,100 °C. Compliance to thermal requirements begins 1 minute after entering the period with constant minimum and maximum limits and is based on a 1-minute rolling average of each thermocouple.
              The test article is held at temperature (engulfing fire condition) until the system vents through the TPRD and the pressure falls to less than 1 MPa. The venting shall be continuous (without interruption), and the storage system shall not rupture. An additional release through leakage (not including release through the TPRD) that results in a flame with length greater than 0.5 m beyond the perimeter of the applied flame shall not occur.

         Table 1
         Summary of fire test protocol
                     Localized Fire Region                                                                     Time Period               Engulfing Fire Region                              (Outside the Localized Fire  Region)
Action               Ignite Burners                                                                            0-1 Minute                No Burner Operation
Minimum temperature  Not specified                                                                                                       Not specified
Maximum temperature  Less than 900 oC                                                                                                    Not specified
Action               Increase temperature and stabilize fire for start of localized fire exposure              1-3 Minutes               No Burner Operation
Minimum temperature  Greater than 300 oC                                                                                                 Not specified
Maximum temperature  Less than 900 oC                                                                                                    Not specified
Action                                                                                                                                   No Burner Operation
                     Localized fire exposure continues
Minimum temperature                                                                                                                      Not specified
                     1-minute rolling average                                        greater than 600 oC
Maximum temperature  1-minute rolling average                                             less than 900 oC     3-10 Minutes              Not specified
Action                                                                                                                                   Main Burner Ignited at 10 minutes
                     Increase temperature
Minimum Temperature                                                                                                                      Not specified
                     1-minute rolling average                                          greater than 600 oC
Maximum temperature