Measuring the Gas Pressure within a High-Performance Insulation Blanket
It is generally agreed that multilayer insulation systems provide excellent thermal protection for cryogenic propellants. However, if the full potential of these systems is to be realized, several requirements must be met. One requirement is that the system be designed to permit evacuation of ground-hold purge gas to a pressure of 1 × 10-4 as rapidly as possible. At that pressure, the primary modes of heat transfer are radiation and solid conduction. Pressure above that value adds a gas conductivity mode of heat transfer, thereby raising the total conductivity of the system, Since gas conductivity is high in relation to radiation and solid conduction, it is necessary first to measure the gas pressure. If the pressure is too high, the system must be modified to reduce it as rapidly as possible. This modification must be made with a minimum reduction of thermal efficiency.
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