Abstract
A test based on the measurement of the rate of pressure rise in hydrazine tanks maintained at 60°C for four days has been developed to assess the long term storability of these systems at ambient. Rates of hydrazine decomposition in a number of tanks were measured over the temperature range 30-80°C in order to correlate rates of pressure rise measured during the acceptance test at 60°C with those occurring at normal storage temperatures. Results from a large number of stainless Steel production tanks filled with various batches of hydrazine are presented and indicate the considerable range of rates of pressure rise that can result from tanks that are nominally identical and filled with hydrazine that meets the specification requirements. extended storage shows that there was some decrease in rates of pressure rise with time thus indicating that the acceptance test carried out shortly after filling underestimates life and errs on the side of safety for this type of tank. Data from tests carried out after
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