Rotary kinetic fluid motors or pumps – Method of operation
Reexamination Certificate
2002-01-25
2003-08-26
Look, Edward K. (Department: 3745)
Rotary kinetic fluid motors or pumps
Method of operation
C415S118000, C415S213100
Reexamination Certificate
active
06609878
ABSTRACT:
SUMMARY OF THE INVENTION
This application claims the priority of PCT International No. PCT/JP99/04346, filed Japan on Aug. 11, 1999, the disclosure of which is expressly incorporated by reference herein.
The present invention relates to a turbine-unit disassembling method and a turbine unit. More particularly, the present invention relates to a turbine unit disassembling method and a turbine unit suitably applicable to boiling-water-reactor power plants.
The turbine building of a boiling-water-reactor power plant houses a turbine unit, a generator to be driven by the turbine unit, and so on. The turbine unit comprises a high-pressure turbine and three low-pressure turbines. The turbine unit has to be overhauled periodically.
Each low-pressure turbine comprises a rotor with blades, diaphragms, an upper inner casing and a lower casing to enclose the rotor and the diaphragms, and an upper outer casing to cover the upper inner casing. The casings are so constructed that the upper outer and inner casings can be separated from the lower casing. The upper outer and inner casings are joined to the common lower casing to be ready for the operation of said low-pressure turbine.
To inspect lower-pressure turbines, they are disassembled. Disclosed in the Japanese Unexamined Patent Application No. 11-84049 is a technique for temporarily placing and keeping the disassembled components of low-pressure turbines until they are reassembled.
More specifically, a middle floor is provided along a plurality of low-pressure turbines in such a way that it does not interfere with radiation shielding bodies which protrude upward from the operating floor of the turbine building of a nuclear power plant. The middle floor is supported by supports constructed on the operating floor. The diaphragms disassembled from the low-pressure turbines in such a way are temporarily placed on the racks on the middle floor, and disassembled small components are carried to below the middle floor and temporarily placed there.
Japanese Unexamined Patent Application No. 7-279616 includes a casing for low-pressure turbines with, the casing having a horizontal part on its top portion. Piping is made on the top portion of the casing, and the horizontal part serves as a foothold during the inspection of the piping.
The object of the present invention is to increase the operating ratios of plants with turbine unites.
The first aspect of the present invention is to provide a method of disassembling a turbine unit. The method include the steps of (i) removing the upper outer casings from a turbine unit and placing them at places other than the place of the turbine unit and (ii) removing the upper inner casings from the turbine unit and placing them on the upper outer casings. In accordance with this method, the upper inner casings removed from a turbine unit require no floor space for their temporary placing and keeping because they are placed and kept on the upper outer casings until they are reassembled to the turbine unit. Accordingly, a large working space can be secured, which makes the inspection of the turbine unit easy and quick and, thereby, shortens the nonoperating time of the turbine unit and increases the operating ratio of the whole plant including the turbine unit.
The second aspect of the present invention provides another method of disassembling a turbine unit. The method includes the steps of (i) removing the upper outer casings from a turbine unit and placing them at places other than the place of the turbine unit, (ii) setting a stand over each of the upper outer casings so that the stand straddles said casing, and (iii) removing the upper inner casings from the turbine unit and placing them on the stands. In accordance with this method, the upper inner casings removed from a turbine unit require no floor space for their temporary placement and retention because they are placed and kept on stands, each straddling an upper outer casing, until they are reassemble to the turbine unit. Accordingly, a large working space can be secured, which makes the inspection of the turbine unit easy and quick and, thereby, shortens the nonoperating time of the turbine unit and increases the operating ratio of the whole plant including the turbine unit. Additionally, it is not necessary to consider the strength of the upper outer casings in order to have them support the upper inner casings.
The third aspect of the present invention further provides that each stand has a means for moving horizontally so as to take a position to straddle one of the upper outer casings. This method as well as the method of the second aspect shortens the nonoperating time of the turbine unit and increases the operating ratio of the whole plant including the turbine unit. Furthermore, as with the second aspect, it is not necessary to consider the strength of the upper outer casings in order to have them support the upper inner casings. Moreover, each stand can be set over an upper outer casing without using an overhead crane.
The fourth aspect of the present invention provides yet another method of disassembling a turbine unit. In this method, the upper inner casing of one turbine being disassembled, among a plurality of turbines, is placed on the upper outer casing of another turbine not being disassembled. In accordance with this method, because the upper inner casing of one turbine being disassembled is placed on the upper outer casing of another turbine not being disassembled, the upper inner casing requires no floor space. Accordingly, a large working space can be secured, which makes the inspection of the turbine unit easy and quick and, thereby, shortens the nonoperating time of the turbine unit and increases the operating ratio of the whole plant including the turbine unit. Additionally because the upper inner casing removed from the turbine being disassembled is placed on the upper outer casing of the turbine not being disassembled which is located near the former turbine, the turbine can be disassembled and reassembled in a relatively short time.
The fifth aspect of the present invention provides still another method of disassembling a turbine unit. The method includes the steps of (i) setting a stand over the upper outer casing of one turbine not being disassembled, among a plurality of turbines, so as to have the stand straddle the casing and (ii) placing the upper inner casing of another turbine being disassembled on the stand. In accordance with this method, because the upper inner casing of one turbine being disassembled is placed on the stand straddling the upper outer casing of another turbine not being disassembled, the upper inner casing requires no floor space. Accordingly, a large working space can be secured, which makes the inspection of the turbine unit easy and quick and, thereby, shortens the nonoperating time of the turbine unit and increases the operating ratio of the whole plant including the turbine unit. Once again because the upper inner casing removed from the turbine being disassembled can be placed nearby, that is, above the upper outer casing of the other turbine not being disassembled without imposing a load on the latter turbine, the disassembly and reassembly of the former turbine can be carried out quickly without concern about any other turbine.
The sixth aspect of the present invention provides a further method of disassembling a turbine unit. In this method, the upper inner casings of one turbine unit being disassembled, among a plurality of turbine units, are placed on upper outer casings of other turbine units not being disassembled. In accordance with this method, because two turbine units or more offer temporary-placing places for the upper inner casings of one turbine unit being disassembled, a large space can be secured around it for inspection work. Accordingly, its inspection can be carried out quickly, which shortens the nonoperating time of the turbine unit and increases the operating ratio of the whole plant including such turbine units.
The seventh aspect of the present invention provides the m
Aramaki Takanori
Ebata Sakae
Ootoshi Tatsuya
Tooyama Norihide
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