对邹县发电厂四期工程和系统状况进行了介绍，确定了主蒸汽系统和主给水系统管道的设计参数，选择了管道材料。
Project and system situation in Zouxian Power Plant were introduced, and the piping design parameters and the piping material of main steam system and main feed water system were determined.
当系统运行压力降低至安全阀的回座压力时，主蒸汽安全阀自行关闭，停止排放，从而对主蒸汽系统的管道和设备起安全保护作用。
When the system pressure drops to the return pressure, the security valve will be closed and stop discharging, in the way of which the pipelines and equipments of the steam system will be protected.
热力钢弯管是主蒸汽管道的薄弱部位之一，其寿命直接关系到整个管道系统寿命。
The heat - resisting steel elbow is one of the weak parts of the main vapour piping, the life of which is directly related to the life of entire piping system.
热力钢弯管是主蒸汽管道的薄弱部位之一，其寿命直接关系到整个管道系统寿命。
The heat - resisting steel elbow is one of the weak parts of the main vapour piping, the life of which is directly related to the life of entire piping system.
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