Tank pressure control of the S-IB stageDuring the first stage boost phase, the heart of both systems is formed by the pressure control modules. These modules are linked to the pressure sensors and a network of valves and make a proportional control of the tank pressure possible. Prior lift-off, during pre-pressurization, the pressurization gas is supplied from separate regulated ground sources for each propellant tank. The relief system is basically a vent system. Each propellant tanks has two vent valves. The S-IB stage is has a cluster of nine tubular shaped propellant tanks. Four non cryogenic RP-1 fuel tanks and five cryogenic Oxygen tanks. Two modes of operation can be distinguished for the tank pressurization:
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Mode 1![]() |
Mode 2![]() |
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