In hydropower plants like any other plants, part failures normally contribute to high maintenance and repair costs; revenue lost due to downtime and cost of replacement power; decreased operating efficiencies; and reduction of equipment service life. In working conditions, the flow of water over the part has a great effect on the rate of corrosion. This means that the shape and condition of the parts in use will have a significant impact on their lifetime, as even a small scratch could cause affect how solution moves over the part, and therefore how it will corrode.