All pressure instruments shall have a vent valve to provide the capability of depressurizing the sensing line after the block valve is closed. 所有压力仪表应配备一个排气阀，以便在截止阀关闭后能够使导压管泄压。
The splice piece shall be cut to length and secured to the bundle on one of the main runs to allow easy field installation across the splice line. 按相应长度切断拼接件并将管束固定在一根主要导压管上，这样可以方便地通过拼接管线进行现场安装。
