Author(s): Lopez-Diez; J. ; Viedma; A. ; Rodriguez; M.

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Abstract: The operational procedure for the space vehicles,as the HERHES orbitalshuttie[1],requires the attitude and orbital thruster control systems to beactivated prior to the completion of the orbit injection maneuver.For safetyreasons,the propellant lines are filled with inertial gas during take-off andatmospheric flight,the propellants being retained in the tanks by latchisolation valves.Depending on the configuration of the pipe work,one or morethruster valves in each branch are opened,exposing the line to the spaceenvironment.When the evacuation of the pipes is completed,the thrustervalves are closed and the latch isolation ones are opened to allow propellantto flow down to the thruster valves.

DOI:

Year: 1991