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dsc46213.jpg

Detail of one of pneumatic lines leading away from the J-2; this is the rightmost line in the bundle.

The labels on the line read "Liquid Hydrogen", "150 PSI", and have arrows pointing away from the J-2. As the only LH2 line leaving the engine, I assume that this is the fuel bleed line, used during engine chilldown when LH2 was circulated from the fuel tank through the low pressure feed duct, through the J-2 engine fuel pump, the fuel bleed valve, and back to the tank through a return line.

 
J-2 Engine at Science Museum Oklahoma (formerly the Omniplex)
Time picture taken Wed Jul 30 15:40:42 2008
Location picture taken Open-Air Exhibit Gallery
Science Museum Oklahoma (formerly the Omniplex)
Oklahoma City, OK
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