主蒸汽系统英中对照翻译文件

4.13 Main Steam System 主蒸汽系统（选项）
4.13.1 General 概述
The main steam system is designed to perform the following functions, but not be limited to:
主蒸汽系统用于实现以下功能（但不限于以下功能）：
- Transport main steam from the steam generator to the HP turbine and to the moisture separator reheater;
- 将主蒸汽从蒸汽发生器输送到高压汽轮机和除湿器再热器
- Provide steam to the auxiliary steam system,
- 将蒸汽提供给辅助蒸汽系统
- Provide steam to gland seals.
- 将蒸汽提供给汽封密封

Beijing Chinese Subtitling Translation Service Agency has translated many technical documents about Main Steam System and Conceptual design criteria.
华译网上海翻译公司曾经翻译过大量有关主蒸汽系统和方案设计标准资料文件。

4.13.2 Conceptual design criteria 方案设计标准
1 The design pressure of the main steam piping shall be the steam pressure at the outlet of the steam generator plus the design pressure margin of the steam generator.
1.   主蒸汽管道的设计压力应为蒸汽发生器出口处的蒸汽压力外加蒸汽发生器的设计压力裕度。

2 The pressure drop at the rated operation shall not cause the inlet moisture level at the turbine stop valve to exceed 0.5%. An optimization should be made of the components affected by the level of pressure drop to determine the most economic configuration.
2.   额定运行条件下的压力降不应造成汽轮机停止阀处的入口水分含量超过0.5%。应该对受到压力降水平影响的部件进行优化，以确定最经济的结构配置。

3 The design temperature of the main steam piping shall be the rated steam temperature at the outlet of the steam generator plus permissible temperature deviation of the steam generator.
3.   主蒸汽管道的设计温度应为蒸汽发生器出口处的额定蒸汽温度外加蒸汽发生器的允许温度偏差。

4 The flow area of the main steam shall be selected to provide an acceptable steam velocity based on successful operating experience, considering expected fluid conditions (pressure, temperature, and moisture levels) and considering the material requirements below. The main steam piping velocity at full load normal operating conditions shall be below 45 m/s.
4. 主蒸汽的流通面积应根据成功的运行经验，考虑预期的流体条件（压力、温度和水分含量）以及以下材料要求进行选择，以提供符合要求的蒸汽速度。满负荷正常运行条件下主蒸汽管道中的蒸汽速度应小于45m/s。

5 The drainage system for main steam piping shall be designed to remove water prior to and during initial rolling of the turbine and during shutdown. Drain flows are not to exceed a velocity of 3 m/s.
5.   主蒸汽管道的排水系统应能够在汽轮机最初转动之前和过程中以及关闭过程中除水。排放水流不应超过3m/s的速度。

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