PIPING SYSTEM CLEANING METHOD, PIPING SYSTEM, AND STEAM TURBINE PLANT

摘要

PROBLEM TO BE SOLVED: To provide a piping system cleaning method capable of suppressing lack of a cleaning force.SOLUTION: A piping system of a steam turbine plant comprises: a steam pipe connected to a steam turbine; a bypass pipe branched off from the steam pipe in a branch section and connected to a condenser; a steam stop valve provided between the branch section of the steam pipe and the steam turbine; and a turbine bypass valve provided in the bypass pipe. A cleaning method for the piping system comprises: a step of connecting, by a temporary pipe having a foreign-matter collection section, at least one valve out of the steam stop valve and the turbine bypass valve to a connection section provided between the turbine bypass valve of the bypass pipe and the condenser; a step of closing a flow passage on a valve outlet side; a step of supplying steam to the steam pipe, and cleaning the steam pipe; and a step of feeding the steam to the condenser via the temporary pipe.SELECTED DRAWING: Figure 3