本标准作为制定冲击式水轮机转轮空化点蚀保证的基础。它还为测量和评估给定水轮机冲击式水轮机转轮上的空化点蚀量提供了依据，该点蚀量在合同中由功率、机器（机头）的比水力能、转速、材料、操作等定义。 当预计点蚀在所有或某些运行范围内时，有必要在合同规定的运行期结束时，对冲击式水轮机上的气蚀点蚀和落差侵蚀程度进行限制。

This standard serves as a basis for the formulation of guarantees on cavitation pitting on Pelton turbine runners. It also provides a basis for the measurement and evaluation of the amount of cavitation pitting on Pelton turbine runners of a given turbine, which is defined in the contract by power, specific hydraulic energy of machine (head), rotational speed, material, operation etc. Guarantees which restrict the extent of caviation pitting and drop erosion on Pelton turbies at the end of an operating period specified in the contract are necessary when the pitting is expected in all or in some operating ranges.