Earlier this year, the SAE Fuel Cell Standards Committee issued SAE Technical Information Report J2601—Fueling Protocols for Light Duty Gaseous Hydrogen Surface Vehicles—the first industry-wide protocol for the fueling of gaseous hydrogen into on-road passenger vehicles operating with nominal working pressures of 35 and 70 MPa (5,075 and 10,150 psi).
Fueling stations are to employ fueling algorithms and equipment to conduct the fueling process within these guidelines. Vehicles filled at stations using these protocols should be designed appropriately for fueling according to these guidelines.
The document establishes safety limits and performance requirements for gaseous hydrogen fuel dispensers. The criteria include maximum fuel temperature at the dispenser nozzle, maximum fuel flow rate, maximum rate of pressure increase, and other performance criteria based on the cooling capability of the station’s dispenser.
The goal of the protocols is to support the achievement of “customer acceptable” fueling—i.e., a full tank of hydrogen within a reasonable amount of time without exceeding the temperature, pressure, and density (state of charge) limits.
This document was requested by the US Department of Energy, US Department of Transportation, California Air Resources Board, and the US Environmental Protection Agency.