The S-IVB also ongoing to thrust at a reduced level by venting gaseous hydrogen, to keep propellants settled of their tanks and prevent gaseous cavities from forming in propellant feed strains. This venting also taken care of Risk-free pressures as liquid hydrogen boiled off while in the gasoline tank. https://topsemiconductorscompanie20752.wssblogs.com/31715367/little-known-facts-about-apollo2