Using the helium mass-spectrometer leak detector to detect the leak of seams between the tube and face-flange and measure the total leakage rate are introduced in this paper.

介绍了核电站蒸汽发生器管子-管板焊缝的氦质谱检漏及总漏率测试方法的研究及为提高检测灵敏度所采取的措施。

youdao

J - t loop is precooled by two - stage pulse tube cryocooler in order to obtain liquid helium temperature.

系统设计用两级脉冲管制冷机预冷小型节流制冷机以获得液氦温区环境。

youdao

The authors give a novel conception that in order to increase the cooling capacity of a pulse tube refrigerator at 80K temperature range, refrigerant mixtures are introduced instead of pure helium.

提出了采用合适的混合工质代替纯质氦以提高脉管制冷机在80K温区制冷量的新构思。

youdao

According to initial indications, the balloon was in the process of landing after 7 a.m. when a cable got caught around a helium tube and a fire erupted, according to an investigator with the state prosecutor's office.

NPR: Fiery Balloon Accident Kills 19 Tourists In Egypt