JPH062952Y2 - Airlock chamber mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a structure for mounting an airlock chamber, and in particular, is improved so that the airlock chamber does not move horizontally due to the gas pressure of an inert gas sealed in a tank. Regarding the mounting structure.

[Prior Art] Generally, in tanks for storing liquefied gas, liquid fuel, petrochemical products, etc., a timely open inspection is performed.
If necessary, the repair work will be performed. These tasks are
After discharging the stored liquid in the tank, the inside of the tank may be filled with an inert gas atmosphere such as nitrogen gas.

Conventionally, in order to check the openness of the tank by filling it with an inert gas, as shown in FIG. 2, the manhole 2 of the tank 1,
An airlock chamber 3 for attaching and removing workers and equipment is attached.

As shown, the outer end 14 of the manhole 2 connected to the tank 1 is inserted into the airlock chamber 3, and the insertion portion 9 is engaged with the side wall opening edge 8 of the airlock chamber 3. There is. An opening / closing door 13 for gas sealing is provided at an outer end portion 14 of the manhole 2 inserted into the airlock chamber 3.

The insertion portion 9 of the manhole 2 inserted into the airlock chamber 3 is attached to the side wall opening edge portion 8 of the airlock chamber 3 by a split fixture 4 as shown in FIG.

The specific structure of this attachment is composed of an upper attachment part 17 and a lower attachment part 18 forming the attachment 4, and the divided edges 6 formed at both ends of each are integrated by screwing. The crimping portion 7 of the fitting 4 is crimped and attached to the outer periphery of the insertion portion 9 of the manhole 2.
Then, the side wall opening edge portion 8 of the airlock chamber 3 and the flange edge portion 5 formed at the end portion of the fixture 4 are respectively screwed, and the airlock chamber 3 and the fixture 4 are engaged with each other. Thereby, the airlock chamber 3 is attached to the manhole 2.

In addition, the air lock chamber 3 is provided with an inert gas supply pump 11 and a doorway 1 for carrying in and out an operator and equipment.
Two are provided.

In operations such as opening inspection of the tank 1, first, after discharging the stored liquid in the tank 1, an inert gas is filled in the tank 1 and the air lock chamber 3 by the pump 11. Then, in a state where these are in a predetermined inert gas atmosphere, the opening / closing door 13 provided in the manhole 2 is closed, and after the worker enters the airlock chamber 3 through the doorway 12, the doorway 12 is opened. Close again.

The air mixed in from the inlet / outlet port 12 at the time of entering / exiting is replaced with an inert gas to be further enclosed, and a predetermined gas atmosphere is created. In this state, the opening / closing door 13 of the manhole 2 is opened, and the worker enters the tank 1 and works.

[Problems to be Solved by the Invention] However, the conventional airlock chamber mounting structure has the following problems.

In order to prevent the invasion of air, the tank 1 is filled with an inert gas having a pressure somewhat higher than the atmospheric pressure. Then, due to the gas pressure from the tank 1, the crimping portion 7 of the fitting 4 crimped to the insertion portion 9 of the manhole 2 is displaced, and the airlock chamber 3 is moved outwardly in the horizontal direction from the tank 1 to improve the sealing property. There was a problem of losing.

For this reason, there has been a problem in that the anchor 15 is provided and fixed to the bottom portion of the airlock chamber 3, which requires labor and cost.

The present invention has been made to solve these problems. The purpose of the present invention is to facilitate the installation and installation of the airlock chamber, and to apply it to the airlock chamber by the pressure of the inert gas from the tank. (EN) Provided is an airlock chamber mounting structure capable of bearing a horizontal force on a flanged spool.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a structure in which an airlock chamber is attached to a manhole so as to create an inert gas atmosphere in the tank at the time of opening inspection of the tank. A removable spool with a flange that engages with the manhole is provided in the opening of one side wall.

[Operation] By detachably attaching the flanged spool with which the manhole of the tank is engaged and the opening edge formed on one side wall of the airlock chamber, the manhole and the airlock chamber can be easily attached and installed. The horizontal force exerted on the airlock chamber by the pressure of the inert gas in the tank is applied to the spool with the flange so that the gas sealability is improved and stable work such as opening inspection of the tank can be performed.

[Embodiment] A preferred embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment according to the present invention.

The tank 1 according to the present embodiment is a double shell tank,
This relates to the structure for mounting the airlock chamber 3 on the tank 1. The double shell tank has an inner tank 21 and an outer tank 2
2, and a cooling material such as pearlite is filled between the inner tank 21 and the outer tank 22, and is used as a storage tank for liquefied gas or the like.

As shown in the figure, the tank 1 is provided with a manhole 2, and this manhole 2 is configured as a double manhole by connecting an inner tank manhole 23 to an inner tank 21 and an outer tank 22 to an outer tank manhole 24. Has been done.

Since the double lock is formed as described above, the airlock chamber 3 is attached to have a double structure of the outer tank flanged spool 27 and the inner tank flanged spool 28.

The outer tank flanged spool 27 is used in the outer tank manhole 24.
Outer tank manhole flange 3 that engages with the flange 34 of
1 and an opening portion flange 25 which is detachably engaged with the opening portion 16 of the airlock chamber 3 are connected by a short pipe.

The inner tank flanged spool 28 is detachably engaged with the inner tank manhole flange 30 that engages with the flange 35 of the inner tank manhole 23 and the opening flange 25 of the outer tank flanged spool 27. The chamber side flange 26 is connected by a short tube.

The outer tank manhole 24 communicates with the gap between the inner and outer tanks 21 and 22. The manhole flange 31 of the outer tank flanged spool 27 is connected to the flange 34 of the manhole 24.
Are screwed together. Further, the flange 25 for the opening of the outer tank flanged spool 27 on the airlock chamber 3 side is screwed into the opening 16 formed in the side wall 19 of the airlock chamber 3. The outer diameter of the opening flange 25 is relatively larger than the opening of the airlock chamber 3. If a threaded hole for screwing the opening flange 25 to the opening 16 is formed as an elongated hole, the engagement of these screwing engagements can be easily performed.

Flange 3 of inner tank manhole 23 communicating with tank 1
The inner tank manhole flange 30 of the inner tank flanged spool 28 is screwed into the inner ring 5. The inner tank manhole flange 30 is formed as an outer peripheral welding flange so as to face the inside of the short pipe. An end portion of the inner tank flanged spool 28 on the airlock chamber 3 side is formed so as to extend inward from an opening portion of the airlock chamber 3, and a chamber side flange 26 is formed at this end portion. . The chamber-side flange 26 of the inner tank flanged spool 28 is screwed into the opening flange 25 of the outer tank flanged spool 27 by a mounting flange 29.

The air lock chamber 3 is provided with a pump 11 for supplying an inert gas and an entrance / exit 12 for carrying in / out an operator or a device.

Next, the operation of this embodiment will be described.

When the inside of the tank 1 is filled with an inert gas atmosphere, the pressure of the inert gas in the tank 1 is applied to the airlock chamber 3, but this pressure is applied between the inner tank manhole 23 of the tank 1 and the inner tank flanged spool 28. It is received by the connection portion and the connection portion between the inner tank flanged spool 28 and the airlock chamber 3.

Therefore, the gas pressure in the tank 1 does not cause displacement between the members of the mounting structure of the airlock chamber 3, and therefore the airlock chamber 3 is displaced horizontally outward from the tank 1. It never moves. Therefore, it is not necessary to attach an anchor to the airlock chamber 3 or to strengthen the foundation.

In the double shell tank according to the present embodiment, the cold storage material filling portion between the inner tank 21 and the outer tank 22 is changed by the change in the amount of the stored liquid in the inner tank 21 and the change in the atmospheric temperature of the outer tank 22, respectively. In order to absorb the expansion and contraction, an inert gas pressure of, for example, about 50 mm / Aq is constantly applied. According to the mounting structure in the present embodiment, the sealing property of the inert gas sealed between the inner and outer tanks 21 and 22 is enhanced, and
The horizontal force applied to the airlock chamber 3 can be absorbed by the inert gas pressure in the tank 1. That is, only the inner tank flanged spool 28 is required to bring the inner tank 21 into an inert gas atmosphere. However, by providing the outer tank flanged spool 27, even if the inner tank 21 is damaged, the air will not flow. You can work safely without getting inside.

Further, since this mounting structure is screwed, the mounting work is easy.

[Advantages of the Invention] Since the present invention is as described above, it has the following excellent effects.

(1) Since the flanged spool is attached between the manhole of the tank and the airlock chamber, the flanged spool can bear the horizontal force to the airlock chamber generated by the gas pressure in the tank.

(2) Since the airlock chamber is attached after the flanged spool is attached to the manhole, the workability is good and the fitting is good, so the sealing property of the enclosed gas is very good.

[Brief description of drawings]

1 is a sectional view of an embodiment according to the present invention, FIG. 2 is a sectional view of a conventional airlock chamber mounting structure, and FIG. 3 is a perspective view of a flange of the mounting structure of FIG. In the figure, 1 is a tank, 2 is a manhole, 3 is an airlock chamber, 16 is an opening, 19 is a side wall, 27 is an outer tank flanged spool, and 28 is an inner tank flanged spool.

Claims (1)

[Scope of utility model registration request] 1. A structure in which an airlock chamber is attached to a manhole so as to create an inert gas atmosphere in the tank at the time of opening inspection of the tank, and a detachable flange engaging with the manhole at one side wall opening of the airlock chamber. A structure for mounting an airlock chamber, characterized in that an attached spool is provided.