Piping system, steam turbine plant, and method of cleaning piping system

Patent metadata

Field	Value
Publication number	US-10337351-B2
Application number	US-201515515314-A
Country	US
Kind code	B2
Filing date	Oct 7, 2015
Priority date	Oct 30, 2014
Publication date	Jul 2, 2019
Grant date	Jul 2, 2019

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.

First claim

The invention claimed is:

1. A piping system of a steam turbine plant, comprising:
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 is configured to connect 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 in which steam supplied to a steam turbine flows; and
a turbine bypass valve connected with the second pipe section and connected with an outlet of the steam turbine, wherein
an angle made by a first central axis of the first pipe section and a second central axis of the second pipe section is larger than an angle made by the first central axis and a third central axis of the third pipe section.

2. The piping system according to claim 1 , wherein
the first central axis and the second central axis are parallel to each other.

3. The piping system according to claim 1 , wherein
the first central axis and the second central axis coincide with each other.

4. The piping system according to claim 1 , wherein
the first central axis and the third central axis are perpendicular to each other.

5. The piping system according to claim 1 , wherein
the opening is arranged above a central axis of the connection section.

6. The piping system according to claim 1 , wherein
an inlet of the steam stop valve into which the steam from the third pipe section flows is arranged above a central axis of the connection section.

7. The piping system according to claim 1 , wherein
the second pipe section is arranged above the first pipe section.

8. A steam turbine plant comprising:
the piping system according to claim 1 .

9. A method of cleaning a piping system of a steam turbine plant,
the piping system including:
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 is configured to connect the first passage and the second passage, and a third pipe section including a third passage connected with the connection passage through an opening, an angle made by a first central axis of the first pipe section and a second central axis of the second pipe section being larger than an angle made by the first central axis and a third central axis of the third pipe section;
a steam generation device connected with the first pipe section;
a steam stop valve connected with the third pipe section having had an inside cleaned and in which steam supplied to a steam turbine flows; and
a turbine bypass valve connected with the second pipe section and connected with an outlet of the steam turbine,
the method comprising the steps of:
closing the steam stop valve; and
supplying steam from the steam generation device and cleaning the first pipe section and the second pipe section.

10. The method of cleaning a piping system according to claim 9 , comprising:
conducting a test to close the steam stop valve;
closing the steam stop valve after completion of the test; and
supplying steam from the steam generation device in a state where the steam stop valve is closed and performing the cleaning.

11. The method of cleaning a piping system according to claim 9 , comprising:
conducting connection between the second pipe section and the turbine bypass valve in a state where the turbine bypass valve is disassembled; and
assembling the turbine bypass valve after the cleaning.

Assignees

• Mitsubishi Hitachi Power Sys

Inventors

• Fujimura Daiki
• Kuroshima Ayumu

Classifications

• F17D1/02

  for gases or vapours · CPC title

• F01D25/002 Primary

  Cleaning of turbomachines · CPC title

• F05D2220/31

  in steam turbines · CPC title

• F01D25/00

  Component parts, details, or accessories, not provided for in, or of interest apart from, other groups · CPC title

• F01K7/165

  Controlling means specially adapted therefor · CPC title