Propellant Supply System
Frost is clearly visible around the cold internal propellant tanks on the external fuselage of the X-15A-2 SE.
The propellant supply system consists of the liquid oxygen supply, anhydrous ammonia supply, valves, and associated plumbing.
The liquid oxygen and ammonia are fed under a low inert gas pressure from the supply tanks to the turbopump for engine operation.
The helium supply systems, which furnish gas pressure for tank pressurization, pneumatic valve operation, and system purging, are described a separate topic.
Note: Frost will appear around the cold propellant tanks of the X-15A-2 SE when filled (LOX, ammonia and external LOX tank).
In this section:
See also:
Engine and Propellant Control Helium System