JPH0222663Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to an airtightness inspection device for large tanks for heavy oil, crude oil, etc., particularly for airtightness inspection devices for manhole devices and mixer devices installed in tanks. .

(b) Prior art and its problems In large tanks for heavy oil, crude oil, etc., the oil is periodically drained and the inside and outside of the tank is inspected to check for structural abnormalities.

Figure 1 shows an example of a large tank, and the side plate of this tank 1 is provided with a side plate manhole device 2 for workers to enter and exit for inspection work, and a mixer for stirring and mixing the oil inside. A device 3 is provided.

As shown in FIG. 2, the above-mentioned side plate manhole device 2 includes:
A nozzle holder 6 is fixed, and a lid 9 is attached to a flange 7 of the nozzle holder 6 via a gasket 8.

Further, detailed illustration of the mixer device 3 described above is omitted, but in this case as well, it is constructed in the same manner as the side plate manhole device 2 shown in FIG. The shaft is made to pass through the manhole 5.

Lid 9 above (mounting seat in case of mixer device 3)
are removed for inspection and reinstalled after appropriate maintenance, but conventionally there has been no appropriate means to check whether airtightness is ensured upon reinstallation. The so-called water filling test, which detects leaks by filling a tank with water, requires an inspection period of approximately one month and uses a large amount of water. No, no.

Due to these circumstances, oil has traditionally been filled without any special airtightness inspection.

Therefore, the object of this invention is to provide an inspection device that can perform an airtight inspection of the above-mentioned portion reliably and quickly.

(c) Means for solving the problem In order to solve the above-mentioned problem, this invention fixes a nozzle around the hole made in the tank side plate, and attaches a blocking plate to the nozzle through a gasket. By fixing an annular airtight bulkhead with a smaller diameter than the nozzle to the inner surface of the closing plate, attaching the inner circumferential edge of the flange to the airtight bulkhead, and pressing the outer circumferential surface against the inner circumferential surface of the nozzle while keeping it airtight. An annular airtight chamber surrounded by a nozzle stub, a closing plate, a partition wall, and a flange is formed along the inner peripheral surface of the nozzle stub, and a compressed air supply pipe of the partition wall or flange is connected thereto.

With this configuration, by supplying compressed air to the supply pipe and detecting the rise in pressure in the airtight chamber or the leakage of air to the outer periphery, It is possible to inspect the airtightness of the mounting part of the mounting seat).

(d) Embodiment FIGS. 3 and 4 show a first embodiment, and show an example applied to a side plate manhole device.

In this device, as in the case of FIG. 2, a nozzle 6 is fixed around a manhole 5 provided on a tank side plate 4, and a lid 9 is bolted to a flange 7 provided on the nozzle 6 through a gasket 8. - It is fixed with a nut 10.

A cylindrical airtight partition 11 shorter than the nozzle 6 is fixed to the inner surface of the lid 9, and an inward partition flange 12 is fixed to the inner end of the airtight partition 11.

An annular closing flange 14 is attached to the above-mentioned bulkhead flange 12 via a packing 13 with bolts and nuts 15.
(See Figure 4). This flange 1
The outer peripheral edge of the nozzle 4 is close to the inner peripheral surface of the nozzle 6, and a packing 17 is placed on a step 16 provided at the end of the nozzle 6.
By pressing this with the packing holder 18, the gap between the flange 14 and the nozzle 6 is airtightly closed.

The above-mentioned packing presser 18 is formed into an annular shape, and is fitted into the threaded rod 19 protruding from the above-mentioned flange 14, and by tightening the nut 20, the packing presser 18
The bent end portion of 8 is pressed against the packing 17 described above.

The closing flange 14 is connected to the airtight bulkhead 1 as described above.
By installing airtightly between 1 and nozzle 6,
Nozzle 6, lid 9, airtight bulkhead 11 and closing flange 1
4 to form an annular airtight chamber 21.

In addition, a compressed air supply pipe 2 is connected to the airtight partition wall 11.
A pressure gauge 23 and a valve 24 are connected to the pipe 22 in the tank, and the pipe 22 is connected to a compressed air supply source such as an air compressor brought into the tank.

Therefore, if the pressure inside the airtight chamber 21 is increased by opening the valve 24, it is possible to detect air leakage from the attachment part of the lid 9 from outside the tank or observe changes in the pressure gauge 23. By doing so, airtightness inspection can be performed.

Note that the first embodiment described above may be configured by being added to the manhole device of an existing tank, or when newly installed, it may be configured from the beginning.

Next, a second embodiment will be described based on FIGS. 5 to 7.

The second embodiment is an example applied to a mixer device 3. In this case, a mixer main body 25 is fixed to a mounting seat 26, a shaft 27 is passed through the mounting seat 26 in an airtight manner, and the shaft is installed inside the tank. 27
A stirring blade 28 is provided at the tip.

The mounting seat 26 is mounted in the same manner as the lid 9, and the other configurations are the same as in the first embodiment. However, in the second embodiment, since the shaft 27 is installed eccentrically, when installing the device of this invention to an existing mixer device, the inner periphery of the closing flange 14 and the packing holder 18 is attached to the stirring blade 2.
8, these are formed in half as shown in FIG. 6, and a flange 29 as shown in FIG. 7 is provided at the abutting portion, and the structure is such that it is fixed with bolts and nuts 31 via packing 30. .

The airtightness test in this case can also be performed in the same manner as in the first embodiment.

(E) Effect As described above, this invention provides an annular airtight chamber along the inner periphery of the attachment part of the closing plate, such as the mounting seat of the side plate manhole device, and compresses the partition wall or flange forming the airtight chamber. The configuration in which the air supply pipe is connected allows for quick and reliable inspections with the minimum amount of compressed air required, and when the blocking plate is removed, it does not interfere with people's access or the installation of the mixer. Never.

Furthermore, airtightness inspection can be performed only from inside the tank without requiring work from both the inside and outside of the tank.

Furthermore, since oil leakage accidents can be prevented, the reliability of inspections and construction work can be significantly improved.

[Brief explanation of the drawing]

Figure 1 is a plan view of the tank, Figure 2 is a sectional view of a conventional manhole device, Figure 3 is a sectional view of the first embodiment, Figure 4 is a partially enlarged sectional view of Figure 3, and Figure 5. 6 is a sectional view of the second embodiment, FIG. 6 is a sectional view taken along the - line in FIG. 5, and FIG. 7 is a sectional view taken along the - line in FIG. 6. 1...Tank, 2...Side plate manhole device, 3
... Mixer device, 4 ... Side plate, 5 ... Manhole, 6 ... Nozzle stand, 9 ... Lid, 11 ... Airtight bulkhead,
13...Packing, 14...Closing flange, 7...
... Packaging, 18... Packing holder, 21... Airtight chamber, 22... Supply pipe, 25... Mixer body.

Claims (1)

[Scope of claim for utility model registration] (1) Fixing a nozzle around the hole provided in the side plate of the tank,
Attach a blocking plate to the nozzle via a gasket,
By fixing an annular airtight bulkhead with a smaller diameter than the nozzle to the inner surface of the closing plate, attaching the inner circumferential edge of the flange to the airtight bulkhead, and pressing the outer circumferential surface against the inner circumferential surface of the nozzle while maintaining airtightness, nozzle,
An airtight inspection device for a large tank, characterized in that an annular airtight chamber surrounded by a closing plate, a partition wall, and a flange is formed along the inner peripheral surface of the nozzle stand, and a compressed air supply pipe is connected to the partition wall or flange. (2) The inner peripheral edge of the flange is fixed to the airtight bulkhead via a packing, the packing is interposed between the outer peripheral edge of the flange and the inner peripheral wall of the nozzle, and the packing retainer is attached to the flange. An airtightness inspection device for large tanks as set forth in claim 1 of the utility model registration claim. (3) The airtightness inspection device for a large tank according to claim 1 or 2, wherein the hole is a manhole and the closing plate is a manhole cover. (4) The airtightness inspection device for a large tank according to claim 1 or 2, wherein the closing plate is a mixer mounting seat.