This document gives guidelines for: 
a) presenting data on hydro-abrasive erosion rates on several combinations of water quality, 
operating conditions, component materials, and component properties collected from a 
variety of hydro sites; 
b) developing guidelines for the methods of minimizing hydro-abrasive erosion by 
modifications to hydraulic design for clean water. These guidelines do not include details 
such as hydraulic profile shapes which are determined by the hydraulic design experts for 
a given site; 
c) developing guidelines based on “experience data” concerning the relative resistance of 
materials faced with hydro-abrasive erosion problems; 
d) developing guidelines concerning the maintainability of materials with high resistance to 
hydro-abrasive erosion and hardcoatings; 
e) developing guidelines on a recommended approach, which owners could and should take 
to ensure that specifications communicate the need for particular attention to this aspect 
of hydraulic design at their sites without establishing criteria which cannot be satisfied 
because the means are beyond the control of the manufacturers; 
f) developing guidelines concerning operation mode of the hydro turbines in water with 
particle materials to increase the operation life. 
It is assumed in this document that the water is not chemically aggressive. Since chemical 
aggressiveness is dependent upon so many possible chemical compositions, and the 
materials of the machine, it is beyond the scope of this document to address these issues.  
It is assumed in this document that cavitation is not present in the turbine. Cavitation and 
hydro-abrasive erosion can reinforce each other so that the resulting erosion is larger than 
the sum of cavitation erosion plus hydro-abrasive erosion. The quantitative relationship of the 
resulting hydro-abrasive erosion is not known and it is beyond the scope of this document to 
assess it, except to suggest that special efforts be made in the turbine design phase to 
minimize cavitation. 
Large solids (e.g. stones, wood, ice, metal objects, etc.) traveling with the water can impact 
turbine components and produce damage. This damage can in turn increase the flow 
turbulence thereby accelerating wear by both cavitation and hydro-abrasive erosion. Hydro-
abrasive erosion resistant coatings can also be damaged locally by impact of large solids. It is 
beyond the scope of this document to address these issues. 
This document focuses mainly on hydroelectric powerplant equipment. Certain portions can 
also be applicable to other hydraulic machines.dition 2.0 2019-01 INTERNATIONAL STANDARD NORME INTERNATIONALE colour inside Hydraulic machines – Guidelines for dealing with hydro-abrasive erosion in kaplan, francis, and pelton turbines Machines hydrauliques – Lignes directrices relatives au traitement de l'érosion hydro-abrasive des turbines kaplan, francis et pelton IEC 62364:2019-01(en-fr) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright ？ 2019