Document ID: chunk:federal_register_of_legislation:F2015L02109:body:0:p29
Version: federal_register_of_legislation:F2015L02109
Segment Type: other
Provision Reference: 
Character Range: 84735–87944

extension of the adjustable thigh bar.  Quadrants are incorporated in the lower leg segments to measure knee angles.  Shoe and foot assemblies are calibrated to measure the foot angle. Two spirit levels orient the device in space. Body element weights are placed at the corresponding centres of gravity to provide seat penetration equivalent to a 76 kg male. All joints of the 3-D H machine should be checked for free movement without encountering noticeable friction.

Figure 5-1
3-D H machine elements designation

Figure 5-2
Dimensions of the 3-D H machine elements and load distribution (Dimensions in millimetres)

Annex 6

Test conditions and procedures for the assessment of post‑crash hydrogen fuel system integrity

                1.  Purpose
Determination of compliance with the requirements of paragraph 5.5.2. of this Regulation.

2.                                   Definitions
For the purposes of this annex:
2.1.                              "Enclosed spaces" indicates the special volumes within the vehicle (or the vehicle outline across openings) that are external to the hydrogen system (storage system, fuel cell system and fuel flow management system) and its housings (if any) where hydrogen may accumulate (and thereby pose a hazard), such as the passenger compartment, luggage compartment and space under the hood.
2.2.                              "Luggage compartment" is the space in the vehicle for luggage and/or goods accommodation, bounded by the roof, hood, floor, side walls, being separated from the passenger compartment by the front bulkhead or the rear bulkhead.
2.3.                              "Nominal working pressure (NWP)" is the gauge pressure that characterizes typical operation of a system. For compressed hydrogen gas containers, NWP is the settled pressure of compressed gas in a fully fuelled container or storage system at a uniform temperature of 15 °C.

3.                                   Preparation, instrumentation and test conditions
3.1.                              Compressed hydrogen storage systems and downstream piping
3.1.1.                        Prior to conducting the crash test, instrumentation is installed in the hydrogen storage system to perform the required pressure and temperature measurements if the standard vehicle does not already have instrumentation with the required accuracy.
3.1.2.                        The hydrogen storage system is then purged, if necessary, following manufacturer directions to remove impurities from the container before filling the storage system with compressed hydrogen or helium gas. Since the storage system pressure varies with temperature, the targeted fill pressure is a function of the temperature. The target pressure shall be determined from the following equation:
Ptarget = NWP x (273 + To) / 288
where NWP is the nominal working pressure (MPa), To is the ambient temperature to which the storage system is expected to settle, and Ptarget is the targeted fill pressure after the temperature settles.
3.1.3.                        The container is filled to a minimum of 95 per cent of the targeted fill pressure and allowed to settle (stabilize) prior to conducting the crash