A helium line unexpectedly vented, eventually leading ground support crews to a ring that had come loose from a seal.
一根氦管路意外泄露，最后地面支持人员发现问题源自一个松动的密封环。
2
In the paper, a theoretical analysis is given for the ordinary helium mass spectrometer method used to detect the "single seal" leakage rate of each two seals in a serial two-seal pneumatic system.
从理论上讨论了用常规氦质谱仪检漏方法测定两密封件串联密封的气路系统各密封件“单密封”泄漏率的问题。
3
As a seal test, sensitivity of helium leak test is higher than other test methods as gas seal and NH_3 leak test.