A mathematical model about the duration of seal test of hydrostatic test for gas pipeline was developed firstly.

建立了考虑管道弹性变形和含有一定量气体时输气管道严密性水试压稳压时间计算的数学模型。

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As a seal test, sensitivity of helium leak test is higher than other test methods as gas seal and NH_3 leak test.

氦泄漏试验作为一种致密性试验，它的检漏灵敏度远远超过了气密性试验和氨渗漏等试验方法。

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As a seal test, sensitivity of helium leak test is higher than other test methods as gas seal and NH_3 leak test.

氦泄漏试验作为一种致密性试验，它的检漏灵敏度远远超过了气密性试验和氨渗漏等试验方法。

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