GB/T 15469-1995 in English

《GB/T 15469-1995反击式水轮机空蚀评定》由TC175（全国水轮机标准化技术委员会）归口，主管部门为中国电器工业协会。
本标准规定了水轮机空蚀的评定条件、测量和评定方法，给出了空蚀保证量。本标准适用于单机容量大于10MW，或混流式转轮公称直径大于或等于1m、轴流式转轮公称直径大于或等于2m的反击式水轮机。小于上述容量或直径的水轮机亦可参照使用。

This standard specifies the evaluation condition, measurement method and evaluation method of hydraulic turbine cavitation pitting, and also offers guaranteed amount of cavitation pitting.
This standard is applicable to the reaction hydraulic turbine whose single capacity is larger than 10 MW or whose mixed-flow runner nominal diameter is larger than or equal to 1m, and axial flow runner nominal diameter is larger than or equal to 2m. It also can be taken as reference for hydraulic turbine whose capacity or diameter is less than the aforesaid values.
For hydraulic turbine whose mixed-flow runner nominal diameter is larger than 6 m and axial flow runner nominal diameter is larger than 8m, its guaranteed amount of cavitation pitting can be determined separately by referring to this standard.
Hydraulic turbine may influence power, efficiency, vibration, and noise of assembling unit because of cavitation, and that situation doesn't belong to scope of this evaluation.