Steam Hammer in a Main Steam System
Background
In this supercritical power plant in China, with boiler capacity 1700 tons/hr, running at 25.5 MPa and 571oC, PIPENET was used to calculate the effect of a pressure surge after a turbine trip, estimating the dynamic forces caused by the rapid closure of the main steam valves and rapid opening of the safety valves. The safety valves open when the pressure exceeds 27.0 MPa, and are fully open once the pressure reaches 27.5 MPa. Two types of pipe are used in this network 420.7 ID x 79.5 mm and 306.4 ID x 59.5 mm. The main steam valve closes in 0.2 seconds.
