本规范提供了用于确定除氧器除氧水中残余溶解氧和终端温差（TTD）性能的规则和试验程序（如有），在除氧水和饱和蒸汽温度之间，对应于蒸汽和收集的除氧水之间界面附近蒸汽区的压力。本规范适用于配有管壳式或直接接触式排气冷凝段的除氧加热器和除氧器。它描述了在浓度高达75μg/L（ppb）的除氧设备中测定水中溶解氧的试验方法。

This Code provides rules and test procedures that are to be used to determine the performance of deaerators with regard to residual dissolved oxygen in the deaerated water and terminal temperature difference (TTD), if any, between the deaerated water and the saturated steam temperature corresponding to the pressure in the steam zone adjacent to the interface between the steam and the collected deaerated water. This Code applies to deaerating heaters and deaerators equipped with either shell-and-tube or direct contact, vent-condensing sections. It describes the test method for the determination of dissolved oxygen in water for deaerating equipment at concentrations up to 75 μg/L (ppb).