GLSV 2 failure traced to faulty liquid hydrogen pressurisation relief valve

by | Mar 25, 2022 | India, Launches, Reliability Info, Satellites

The cause of the 12 August 2021 launch failure of the GSLV 2 CUSP 1 launch vehicle, which lost the EOS-03 satellite (formally called GISAT 1 GEO Imaging Satellite), has been revealed by India’s space agency ISRO (Indian Space Research Organisation).  After a successful initial lift off, lthe GSLV-F10’s Cryogenic Upper Stage (CUS) ignition failure resulted in orbital velocity not being achieved and an inflight automatic termination of the launch. An investigation into the failure found that a pressure loss in the liquid hydrogen (LH2) tank had occurred (detected at 297.3s) due to a probable fault in the Vent and Relieve Valve (VRV) used to relieve pressure during a flight (it has subsequently been suggested that damage in the soft seal could have occurred during the valve operations or due to contamination and valve mounting stresses induced under cryogenic temperature conditions).

The GSLV 2 rocket attempting to orbit EOS-03 begins its mission only to see it cut short minutes later. Courtesy of ISRO via YouTube

The accidental pressure loss resulted in anomalous operation of the Fuel Booster Turbo Pump (FBTP) mounted inside the LH2 tank, which feeds the main turbopump of the engine, resulting in insufficient flow of Liquid Hydrogen into the engine thrust chamber. The onboard computer terminated the mission at 307 seconds into the flight. As a result of the failure, future GSLV flights will have a new active pressurisation system fitted to the tank, along with a strengthened VRV.

About Seradata

Seradata produce the renowned Seradata database. Trusted by over 100 of the world’s leading Space organisations, Seradata is a fully queryable database used for market analysis, failure/risk assessment, spectrum analysis and space situational awareness (SSA).

For more information go to

Related Articles




nasaspacexecoreviewsissesaArianespacevideochinaFalcon 9v1.2FT Block 525virgin galacticULAfalcon 9RoscosmosevaDGAspacewalkaviation weekaressoyuzIGTInternational Space StationBeidouawardsRocket LabBlue OriginspaceStarlinkSatellite broadcastingrussiamoonAirbus DSISROCargo Return VehicleboeingmarsblogresearchOneWebspaceshiptwojaxaorionmarsimpactdelayhyperbolaEutelsatdemocratrocketlunarhypertextobamagoogle lunar prizelaunchVegabarack obamaconstellationSEStourismnorthfiguresthales alenia spacespaceflightnode 2fundedRaymond LygoIntelsat2009Lockheed MartinExpress MD-2Elon MuskAtlas Vromess2dassault aviationaviationLucy2008wk2sstlukradiomissilesuborbitaldocking portexplorationAriane 5 ECAVirgin OrbittestinternetLong March 2D/2sts-122Ariane 5Northrop GrummanSLSChina Manned Space EngineeringElectronflightspace tourism2010cotsnewspapermissile defensegalileospaceportExpress AMU 1Long March 4Cbuildspace stationaltairsoyuz 2-1aProton Minternational astronautical congressshuttleEuropean Space AgencyLauncherOneCosmosIntelsat 23scaled compositeshanleybudgetspace shuttlerulesnew yorkAriane 6shenzhouatvVietnamcongressMojaveboldenLong March 2COrbital ATKInmarsatcnesnew shepardiaclunar landerGuiana Space CenterkscApollolawsSpace Systems/LoralUK Space AgencyLong March 4BKuaizhou 1AILSprotonUS Air ForceTalulah RileydarpaElectron KSFalcon 9v1.2 Block 5Vega CeuAstriumSkylonpicturebaseusaastronautdragonlanderfiveeventTelesatNorth KoreaSSLAprilSNC50thinterviewLong MarchSea LaunchfalconWednesdaycustomerlinkatlantissuccessor