Control method for dangerous waste tank operating under vacuum involves measuring the explosive vapor concentration and comparing it to a safe value to calculate safe operation of pumping circuit

摘要

The method of operating a dangerous waste storage tank (1) involves determining the vapor concentration in the surrounding atmosphere from the waste. The vapor concentration measured is compared to a safe threshold value and pumping circuits (7), which might generate a spark, are only operated at a safe vapor concentration level. Claims include a pumping circuit using the safety method.