1. Replacing hydride bed with bottle Advantages No risk of diminished bed capacity Following jobs no longer necessary – Move pressure gauge – Replace cracked rubber tubing – Reinstate glycol line with drain – Purchase expansion tank – Replace hydrogen regulator – Reinstate auxiliary chiller – Purchase more glycol coolant No icing/condensation collection inside gas panel Quicker empty procedure Disadvantages Each fill operation needs 2 hydrogen bottles Each empty procedure will result in lots of hydrogen gas being vented Spare H2 bottles must be stored in case of emergency vent New control sequences need to be written Assumptions Baseline plan is for 2 absorber fills Outcome from R&D was that each bed charge would last 2-3 fills before needing topped up

2. Hydrogen fill procedure

3. System under vacuum after purge, H2 bottle connected

4. Hydrogen fills charging line up to control valve

5. Hydrogen liquefied through control valve loop

6. Bottle empty, close valve, remove from system

7. Open valve to purge pump

8. Vac out and helium purge charging line

9. Connect second bottle

10. Hydrogen fills charging line up to control valve

11. Absorber now full

13. Vac out charging line

14. Prepare system for empty

15. Hydrogen empty

16. System ready for empty

17. Open up bypass valve, ready for empty

18. Open valve to vent line, switch heater on absorber

19. Absorber empty

20. Close vent line

21. Open purging line

22. Pump and purge whole system