Abstract: This steam turbine plant comprises: a boiler; a steam turbine; a condenser; a condensate pump; a main steam line that is capable of guiding, to the steam turbine, steam generated in the boiler; a bypass line that is branched from the main steam line and is connected to the condenser; a condensate line that is capable of guiding, to the condensate pump, water in the condenser; a condensate outlet valve that is provided in the condensate line; a water supply line that is capable of guiding, to the boiler, water having a pressure which has been increased in the condensate pump; a first connection unit that is, in the condensate line, branched from a position which is closer to the condenser than the condensate outlet valve is; and a second connection unit that is, in the condensate line, branched from a position which is closer to the condensate pump than the condensate outlet valve is. The first connection unit has a first connection seating that is connectable with a first line.

Abstract: This steam turbine plant comprises: a boiler; a steam turbine; a condenser; a condensate pump; a main steam line that is capable of guiding, to the steam turbine, steam generated in the boiler; a bypass line that is branched from the main steam line and is connected to the condenser; a condensate line that is capable of guiding, to the condensate pump, water in the condenser; a condensate outlet valve that is provided in the condensate line; a water supply line that is capable of guiding, to the boiler, water having a pressure which has been increased in the condensate pump; a first connection unit that is, in the condensate line, branched from a position which is closer to the condenser than the condensate outlet valve is; and a second connection unit that is, in the condensate line, branched from a position which is closer to the condensate pump than the condensate outlet valve is. The first connection unit has a first connection seating that is connectable with a first line.

Abstract: A piping system of a steam turbine plant is provided with: steam piping connected to a steam turbine; bypass piping which branches from the steam piping at a branching portion and which is connected to a condenser; a steam check valve provided between the branching portion of the steam piping and the steam turbine; and a turbine bypass valve provided in the bypass piping. A piping system cleaning method includes the steps of: connecting at least one valve of the steam check valve and the turbine bypass valve and a connecting portion provided between the turbine bypass valve of the bypass piping and the condenser, by using temporary piping having a foreign matter collecting portion; closing a flow path on the outlet side of the valve; cleaning the steam piping by supplying steam to the steam piping; and sending the steam to the condenser through the temporary piping.

Abstract: A piping system of a steam turbine plant includes: a piping member including a first pipe section including a first passage, a second pipe section including a second passage, a connection section arranged between the first pipe section and the second pipe section and including a connection passage that connects the first passage and the second passage, and a third pipe section including a third passage connected with the connection passage through an opening, the first pipe section being supplied with steam; a steam stop valve connected with the third pipe section; and a turbine bypass valve connected with the second pipe section. An angle made by a first central axis and a second central axis is larger than an angle made by the first central axis and a third central axis.

Abstract: A piping system of a steam turbine plant is provided with: steam piping connected to a steam turbine; bypass piping which branches from the steam piping at a branching portion and which is connected to a condenser; a steam check valve provided between the branching portion of the steam piping and the steam turbine; and a turbine bypass valve provided in the bypass piping. A piping system cleaning method includes the steps of: connecting at least one valve of the steam check valve and the turbine bypass valve and a connecting portion provided between the turbine bypass valve of the bypass piping and the condenser, by using temporary piping having a foreign matter collecting portion; closing a flow path on the outlet side of the valve; cleaning the steam piping by supplying steam to the steam piping; and sending the steam to the condenser through the temporary piping.

Abstract: A piping system of a steam turbine plant includes: a piping member including a first pipe section including a first passage, a second pipe section including a second passage, a connection section arranged between the first pipe section and the second pipe section and including a connection passage that connects the first passage and the second passage, and a third pipe section including a third passage connected with the connection passage through an opening, the first pipe section being supplied with steam; a steam stop valve connected with the third pipe section; and a turbine bypass valve connected with the second pipe section. An angle made by a first central axis and a second central axis is larger than an angle made by the first central axis and a third central axis.