The role of isolated nitrogen in reciprocating-piston compressors

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The nitrogen used for isolation maintains a pressure of 0.15 MPa in the compartment on the cylinder side, and 0.10 MPa in the compartment on the fuselage side. The 0.15 MPa nitrogen serves to isolate the sealing filler of the cylinder, preventing hydrogen from the cylinder from leaking into the isolation compartment. The 0.10 MPa nitrogen is supplied at the partition of the isolation compartment, where it acts as a protective element and for purging any small amounts of hydrogen that might leak into the compartment as well as the oil vapor generated by the tie rods. Is this order reversed? I believe the medium leaking from the compressor packing is hydrogen, and two isolation chambers are provided to prevent hydrogen from escaping into the crankcase. If the pressure in the cylinder-side compartment is higher than that in the fuselage-side compartment, the leaked hydrogen may flow from the cylinder-side compartment into the fuselage-side compartment, thereby defeating the purpose of using nitrogen for isolation in the compressor. So, my question is: should the pressure in the cylinder-side isolation chamber be lower than the nitrogen pressure in the fuselage-side isolation chamber? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? If any fellow travelers know the answer, please give an accurate one. Thank you!