ISO PAS 15594:2004 pdf download Airport hydrogen fuelling facility operations
Scope
This Publicly Available Specification specifies the fuelling procedures, hydrogen boi-off managementprocedures, storage requirements of hydrogen, and characteristics of the ground support equipment requiredto operate an airport hydrogen fuelling facility.
2 Normative references
The following referenced documents are indispensable for the application of this document. For datedreferences, only the edition cited applies. For undated references, the latest edition of the referenceddocument (including any amendments) applies.
SO 14687,Hydrogen fuel- Product specification
SO 20421-1, Cryogenic vessels – Large transportable vacuum insulated vessels – Part 1: Design, fabrication.inspection and testing
ASME 1998，Boiler and Pressure Vessel Code
KSC1)-STD-Z-0009C, Cryogenic Ground Support Equipment, Design of, Standard for
KSC-STD-Z-0005B, Pneumatic Ground Support Equipment, Design of, Standard for
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
block fuelquantity of fuel to be used for refuelling prior to each flight
3.2
refuelling block time
time needed to refuel the aircraft, measured between connection and disconnection of the couplings
3.3
inert gas
nonflammable and nonreactive gas
EXAMPLESHelium, nitrogen,carbon dioxide
4 Symbols and abbreviated terms
AP auxiliary power unit
CO carbon monoxide
5 Fuelling procedures
5.1 General requirements
At the airport, the following situations shall be considered:
normal refuelling during ground turnaround, with an onboard system in cold condition up to the refuelling/boil-off coupling;
defuelling of the system on the ground due to planned maintenance activities and applicable troubleshooting cases;
refuelling of a warm, air-floated onboard system before putting into service and after planned maintenance activities and applicable troubleshooting cases.
The airport infrastructure shall provide the ground support equipment required for performing the above- mentioned refuelling and defuelling operations, including the aircraft tank warm-up and precooling, the necessary purification and purging processes, and the evacuation and GH 2 /LH 2 recovery that is required for defuelling operations and refuelling of a warm onboard system. Purge, precooling and warm-up procedures for the onboard fuel system shall be required only for putting into service, maintenance and troubleshooting activities. The connection point between the aircraft and the ground support equipment shall consist of two couplings (similar but mistake-proof), a refuelling coupling for providing the tanks with LH 2 , and a boil-off coupling for the discharge of GH 2 . In Annex A, Figure A.1 provides an example of an aircraft refuelling and defuelling interface point and Figure A.2 an example of a hydrogen aircraft-fuel system layout.
5.2 Bonding and grounding procedures
Airport personnel shall apply appropriate bonding and grounding procedures prior to performing any refuelling or defuelling operations on an aircraft.