ISRO pinpoints cause of August ’21 failure of India’s GSLV
India’s space agency ISRO has completed its investigation of the failure of the third stage of its GSLV rocket during an August ’21 launch, identifying a leaky valve as the cause.
The leakage in the Vent and Relief Valve is being attributed to the damage in the soft seal that could have occurred during the valve operations or due to contamination and valve mounting stresses induced under cryogenic temperature conditions.
“The committee has submitted comprehensive recommendations to enhance the robustness of the Cryogenic Upper Stage for future GSLV missions, which includes an active LH2 tank pressurization system to be incorporated to ensure sufficient pressure in the LH2 tank at the appropriate time before engine start command, strengthening of Vent & Relief Valve and associated fluid circuits to avoid the possibility of leakage along with the automatic monitoring of additional cryogenic stage parameters for giving lift-off clearance,” Isro said.
India entire space industry almost completely shut down for two years due to its panic over the Wuhan flu. This launch was part of its effort to resume launches, and the failure only added to that shutdown.
India’s space agency ISRO has completed its investigation of the failure of the third stage of its GSLV rocket during an August ’21 launch, identifying a leaky valve as the cause.
The leakage in the Vent and Relief Valve is being attributed to the damage in the soft seal that could have occurred during the valve operations or due to contamination and valve mounting stresses induced under cryogenic temperature conditions.
“The committee has submitted comprehensive recommendations to enhance the robustness of the Cryogenic Upper Stage for future GSLV missions, which includes an active LH2 tank pressurization system to be incorporated to ensure sufficient pressure in the LH2 tank at the appropriate time before engine start command, strengthening of Vent & Relief Valve and associated fluid circuits to avoid the possibility of leakage along with the automatic monitoring of additional cryogenic stage parameters for giving lift-off clearance,” Isro said.
India entire space industry almost completely shut down for two years due to its panic over the Wuhan flu. This launch was part of its effort to resume launches, and the failure only added to that shutdown.