How does solid-particle erosion occur?
Solid-particle erosion, i.e. SPE occurs in the high-pressure blades. And it takes place when hard particles of iron exfoliated by steam from superheater tubes, reheater tubes, steam headers and steam leads strike on the surface of turbine blades. • How does the damage to turbine-blades tell upon the efficiency of the unit? Answer: The damage to blade profiles changes the geometry of steam flow path and thereby reducing the efficiency of the unit. • How does the dirty safety trip valve trip the safety trip at normal speed? Answers: Dirt may find its way to the safety trip valve and get deposited around the spring end cap end. This will block the clearance between the safety trip valve and the spring end cap. As a result the steam pressure in the spring cap gets lowered allowing the valve to close. What is the remedy to it? The spring end cap as well as safety trip valve should be cleaned. • How does the foreign-particle damage of turbine blades arise? Answer: It occurs due to impact on
