JPH0140962Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a buttful plate structure in a pressure vessel, etc., which is particularly used in a pressure vessel, a heat exchanger, or other double-walled vessel.

PRIOR TECHNOLOGY To explain the prior art by taking as an example a steam drum used as a pressure vessel etc. in a steam/water separation device of a forced circulation boiler, the following are the fourth, fifth, sixth, seventh,
8 and 9, the steam/water separation device 1 is installed in a steam drum container 2 made of a steel plate, and a steam/water mixture 3 generated in a boiler (not shown) flows from the riser pipe stand 4 into the container. an air-water mixture chamber 6 which is enclosed and constituted by a baffle plate 5;
and then introduced into the steam separator. The high-purity steam that has been separated into water and steam in the separator is sent from the saturated steam pipe stand 7 to the superheater indicated by the arrow 14, but the buffle plate is configured to move the inside of the container with the buffle plate. It plays an important role of partitioning into two chambers, a steam/water mixture chamber 6 and a high purity steam chamber 15.

However, as shown in FIG. 6, the steam drum container is manufactured by bending a flat steel plate 17 to form a half-body plate 18 and a head plate 19, and then joining the half-body plates to form a body cylinder 20. The container 2 is completed by joining the end plate to the end of the body tube, and then joining several of the body tubes together. A visual inspection is required, and the baffle plate 5, which should be completely airtight, must be cut each time. After visual inspection, the cut portion was
As shown in Figures 8 and 9, it is necessary to weld the backing plate 9 from inside the container to restore the structure, but due to the welding of the backing plate, the structure of the buttful plate changes due to the welding heat. In order to correct the problem, it is necessary to carry out the difficult work of cutting again and carrying out restoration work. Furthermore, if there is a defect in the welded portion of the plate, the steam/water mixture 3 may leak from the defect into the high-purity steam chamber 15 and into the superheater.

Problems to be solved by this invention This invention avoids the difficult work during restoration work after cutting the buttful plate and visually inspecting the vessel joints during periodic inspections of pressure vessels, etc. , the purpose is to prevent leakage of the steam-water mixture into the steam room.

Means for Solving the Problems This invention is based on a method in which a cylindrical viewing tube is protruded into the vessel through a cutout for visual inspection, which is bored in the main part of the buttful plate disposed inside the pressure vessel, etc. At the same time, a blind plate with a handle is fixed to the end of the sight tube.

Therefore, according to the configuration of this invention, during visual inspection, the blind plate is removed from the end of the viewing tube using a grinder, and by grasping the handle, the blind plate is removed. After inspection, the blind plate is hermetically welded to the end of the sight tube to recover the condition, but airtight welding can be performed without directly transmitting the welding heat during the blind plate welding work to the baffle plate.

Embodiment Next, an embodiment of this invention will be explained with reference to the drawings. In Figs. 1, 2 and 3, the internal pressure is about 200 Kg/cm ² and the temperature is about 350 Kg/cm 2 during use.
A steam drum container 2 is equipped with a buttful plate 5, except for the top and bottom parts, inside the steam drum container 2, which is obligated to periodically visually inspect the joints 8 of the constituent steel plates. A high-purity steam chamber 15 equipped with a steam-water mixture chamber 6 on the side and a steam-water separator 1 (not shown) on the outside of the mixture chamber.
Cut-out portions 21 for visual inspection are provided at several appropriate locations at the joint portion of the buttful plate forming the
A cylindrical sight tube 10 is fixed to the periphery of the incision, and a steam chamber 1 is attached to the other end of the sight tube.
A blind plate 11 with a handle 12 on the 5 side is airtightly welded 1.
3, and during periodic inspection, the welded portion between the blind plate and the sight tube is removed using a grinder, the blind plate is removed, and the container joint is visually inspected. The plate is hermetically welded to the sight tube 10 and restored.

Effects of the invention As mentioned above, this invention does not cause any damage to the buttful plate 5 both at the start and end of inspection, and in particular during welding work during restoration work, the welding heat is not directly applied to the buffful plate 5. Since there is no heat transfer to the full plate, there will be no structural changes or distortions, and since both the inspection start and restoration work are extremely easy, the cost of the work can be significantly reduced. The practical benefits of this idea are enormous.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of the embodiment of this invention applied to a steam drum container, Fig. 2 is an enlarged view of section A in the previous figure, and Fig. 3 is taken along the line X-X in Fig. 2. figure,
FIG. 4 is a side view of the steam drum container, and FIG. 5 is a side view of the steam drum container.
BB enlarged sectional view in the previous figure, FIG. 6 is an explanatory perspective view showing the manufacturing process of the steam drum container, FIG. 7 is a longitudinal sectional front view of a conventional example of the steam drum container, and FIG. 8 is an enlarged view of part C in the previous figure, and Figure 9 is
FIG. 8 is a view taken along the YY arrow in FIG. 8; 2...Steam drum container, 5...Bathful plate, 6...Steam/water mixture, 8...Joint part, 10...
...Peep tube, 11...Blind plate, 12...Handle, 13...
Airtight welding, 15... High purity steam chamber, 21... Cut-off section for visual inspection.

Claims (1)

[Scope of utility model registration request] A pressure vessel consisting of a buttful plate provided with a cut-out section for visual inspection disposed inside a pressure vessel, a viewing tube with one end fixed to the periphery of the cut-out section, and a blind plate fixed to the other end of the viewing tube. Batsuful plate structure in etc.