JPS63187133A - Apparatus for detecting leakage of sump pit - Google Patents

Abstract

PURPOSE:To easily set the detection level of leakage and to reduce working load, by mounting a stand to the throw-in type and electrode type level detection part of a sump pit leakage detection apparatus in a height-adjustable manner. CONSTITUTION:A level detection part 19 and a stand 20 are integrally accessible with respect to a sump pit 3 by a wire 2. In order to set the operation point of the level detection part to the set level of the leaking water in the sump pit 3, the clamping screw 22 provided to the stand 21 is loosened and the operation point of the level detection part 19 is matched with the position of the set level from the bottom surface of the stand 20 and subsequently fixed by tightening the clamp screw. By this method, the setting of a level can be easily performed. Then, by anchoring the stand 21 having the set detection part 19 mounted thereon to the bottom of the sump pit 3, the detection of leaking water can be easily performed according to the set level.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a sump pit leakage detection device, and particularly to a leakage detection device that can be easily tested for operation in the field.

[Background of the invention]

As shown in FIG. 4, the sump tank 1 that stores petroleum and the like is filled with water to form a water layer 2 at the bottom to prevent direct leakage of petroleum and the like. This sump tank 1 is provided in a sump pit 3 formed by digging down from the ground surface. This sump tank 1
If a leak occurs from the sump tank 1, the water 2 at the bottom will accumulate in the sump pit 3, so the leakage detection device detects the water accumulated in the sump pit 3 and removes the water from the sump tank 1.
leakage has been detected.

There are leak detection devices that utilize various detection principles, and FIG. 4 shows one that utilizes an electrode type level switch. In the figure, a pair of electrode rods 4
is inserted into the sump pit 3, and the upper end of the electrode rod 4 is supported by an electrode holding part 5 and fixed to the upper part of the sump pit 3 via a flange 6. The upper end of the electrode rod 4 is housed and protected within a guide pipe 7 fixed to a flange 6. If water accumulates in the sump pit 3 where leakage from the sump tank 1 has occurred, the current from the switch section 8 will flow between the electrode rods 4 through this water, making it easy to detect the leakage. can. However, when conducting an actual operation test of this level switch on-site, one worker must bring a container filled with water into the sump pit 3, or put a container filled with water from the top of the sump pit 3, and then It was difficult to check the operation of the switch by inserting the electrode rod 4 inside.

There is also a method of pulling out this electrode rod 4 from the sump bit 3 and conducting an actual operation test, but in this case, when the electrode rod 4 is installed in the sump bit 3 again after carrying out the actual operation test, There is a problem in that it is not possible to sufficiently confirm whether the switch actually operates at a specified position from the bottom of the sump pit 3. Furthermore, since the electrode rod 4 is long, there is a problem in that a space and a device for supporting the electrode rod 4 are required for pulling out, installing, and testing.

FIG. 5 shows a case where a float type level switch is used. A level switch 9 is attached to the top of the sump pits 1 to 3, and a float 11 connected to the level switch 9 via a connecting rod 10 is inserted into the sump pit 3. The float 11 is housed and protected within a guide pipe 7 fixed to the level switch 9. According to this structure, leakage occurs in the sump tank 1 and the sump pit 3
When leakage water accumulates inside, the float 11 is displaced and the level switch 9 is actuated via the connecting rod 10, so that the occurrence of leakage can be detected. However, when conducting an actual operation test of this level switch on-site, as in the case of the electrode type level switch described above, a container filled with water is placed in the sump pit 3, and the float 11 is floated in the water. We had to check the operation, which was very difficult. Further, even if this level switch was pulled out from the sump bit 3 and an actual operation test was carried out, there were problems similar to those of the electrode type level switch.

FIG. 6 shows a back pressure level switch using yet another detection principle, in which a detection pipe 12 is inserted into the sump pit 3, and the upper end of the detection pipe 12 is connected to the air chamber 13. It has a structure in which a diaphragm 14 and a switch 15 are attached.

According to this structure, if a leak occurs in the sump tank 1 and leaked water accumulates in the sump pit 3, the detection pipe 12
The head pressure of water is transmitted to the air chamber 13 via the air inside.

Leakage can be detected by displacing the diaphragm 14 and operating the switch 15, but when conducting an actual operation test, the same problem as in the case of the two level switches described above occurred.

As shown in FIG. 7, the actual operation test method for this back pressure type level switch is to check the head pressure at a preset operating point, and then connect the main valve 17 and test valve 18 to the detection pipe 12. The test can be performed by closing the main valve 17 and applying a specified pressure from the test valve 18, but since the detection pipe 12 and valves 17 and 18 are required to be airtight, once the instrument is installed, the sump tank 1 If leakage occurs and leaked water accumulates in the sump pit 3, if the test valve 18 is leaking, the detection pipe 1
There was a problem in that the switch 15 might not operate because head pressure would not come out even if water entered the switch 2.

As mentioned above, in any case, in order to reliably check the operation of a leak detection device installed in the sump pit, one worker must either bring a container containing water into the sump pit or remove the tip from the top of the sump pit. One possibility is to conduct the test by inserting a test jig with a container filled with water in it, but either method has the disadvantage of placing a heavy burden on the working tools.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned points, and its purpose is to provide a sump pit leak detection device that allows easy setting of leak detection level and actual operation test at the installation site.

[Summary of the invention]

The present invention provides a mount in an electrode type level detection section for detecting liquid leaked from a sump tank installed in a sump pit and accumulated in the sump pit, and these level detection sections and the mount are integrated into the sump pit. The above object is achieved by being able to be taken in and out of the sump pit.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the sump pit leak detection device according to the present invention will be described below with reference to the drawings.

An embodiment of the present invention is shown in FIGS. 1, 2, and 3.

In this figure, the same or equivalent parts as in the conventional example shown in FIG. 4 are denoted by the same reference numerals. In FIGS. Both poles are formed by the portion 19a and the electrode portion 19b provided approximately at the center thereof. This level detection section 19
A stationary type pedestal 20 for level setting is attached to the upper part of the pedestal 20 by tightening screws 22 via a holding plate 21 provided on a stationary type pedestal 20 for level setting. A wire 23 is attached to the pedestal 20 in order to allow the pedestal 20 to which the drop-in electrode type level detection section 19 is attached to be placed on the bottom surface of the sump pit 3 or to be pulled out from the bottom surface. Further, a cable 24 for extracting a signal is connected to the electrode type level detection section 19, and this cable 24 is connected to the switch section 8 of the level switch. Further, a sump tank 1 is installed in the sump pit 3, and a guide pipe 7 for guiding the pedestal 20 is inserted into the sump pit 3 from the upper part of the sump pit 3.

The operation of this embodiment configured as described above will be explained below. FIG. 1 shows a state in which a pedestal 20 to which a drop-in electrode type level detection unit 19 is attached is placed at the bottom of a sump pit 3. To pull this frame 20 out of the sump pit 3 from the bottom of the sump pit 3,
The tip of the wire 23 attached to the pedestal 20 is pulled out of the sump pit 3. By pulling the wire 23, the pedestal 20 to which the drop-in type electrode type level detection unit 19 is attached passes through the guide pipe 7 and connects to the sump pit 3.
It can be pulled out. Conversely, in order to place the pedestal 20 to which the level detection section 19 is attached at the bottom of the sump pit 3, the pedestal 20 is inserted into the guide pipe 7 and the wire 23 is loosened. In this case, the wire 23 may be pulled or loosened by a worker directly by hand, or the wire may be wound using a mechanical device such as a device.

To set the operating point of the level detector 19 to the set level of leakage water in the sump pit 3, loosen the tightening screw 22 attached to the pedestal 2o, and
Adjust the operating point of the frame 20 to a set level from the bottom surface of the frame 20, and then tighten and fix it with the tightening screw 22.

As a result, the distance between the operating point of the level detection section 19 and the bottom surface of the pedestal 20 is always kept constant, and level setting can be easily performed. By placing the pedestal 20 to which the level detecting section 19 set in this manner is installed at the bottom of the sump pit 3, leakage water can be easily detected at the set level.

When conducting an actual operation test of this device, take the pedestal 20 out of the sample pit 3 using the method described above, place it in a container that can store water, such as an aquarium, and inject water into the container. Perform an operation test. Since the level is set using the pedestal 20, it is possible to easily conduct an actual operation test similar to that in the case where the sump pit 3 is placed at the bottom.

After carrying out the actual operation test, it is only necessary to return the pedestal 20 to which the level detection section 19 is attached to the bottom of the sump pit 3.

In the above-described embodiment, a case has been described in which the pedestal 20 to which the level detection unit 19 is attached is guided by the guide pipe 7 inserted from the top of the sump pit 3. However, as shown in FIG. mount 2
A cylindrical fall prevention wall 25 is fixedly installed to prevent the 0 from falling, and the pedestal 20 is placed within this fall prevention wall 25.

The guide pipe 7 may be omitted, and the level detection section 19 may be omitted.
A cable 24 may be used instead of the wire 23 as a means for taking the pedestal 20 attached thereto into and out of the sump pit 3.

〔Effect of the invention〕

As described above, according to the present invention, a pedestal is attached in a height-adjustable manner to the drop-in type electrode type level detection part of the sump pit leak detection device that detects the level of liquid leaked into the sump pit. Detection level can be easily set.

Moreover, since the actual operation test can be easily performed outside the sump bit, the burden on the operator is greatly reduced.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the sump pit leakage detection device according to the present invention, FIG. 2 is a partially cutaway front view showing the throw-in type electrode type level detection section of FIG. 1, and FIG. Main part vertical sectional views showing other embodiments of the present invention, FIGS. 4 to 7
The figures up to the figure are configuration diagrams showing the conventional sump pit leakage detection device. Fig. 4 shows an electrode type level switch, Fig. 5 shows a float type level switch, and Figs. 6 and 7 show a case where a back pressure type level switch is used. shows. 1...Sump tank, 3...Sump pit, 7...
・Guide pipe, 8...Switch part, 19...Electrode type level detection part ・20°°° mount ・23°°゛74"・
24°°°“-6,-2-11, pull,
・“・4゛l-n

Claims (1)

[Claims] 1. An electrode type level detection section for detecting liquid leaking from a sump tank installed in a sump pit and accumulated in the sump pit, and a cable connected to this level detection section; In a sump pit leakage detection device comprising a switch section connected to this cable, a pedestal is provided for the electrode type level detection section, and the level detection section and the pedestal can be integrally moved in and out of the sump pit. A sump pit leak detection device characterized by: 2. The pedestal is attached to the electrode type level detection section so that the height thereof can be adjusted according to the level of the leaked liquid to be detected in the sump pit. Sump pit leak detection device. 3. The sump pit leak detection device according to claim 1 or 2, wherein the pedestal is vertically movably guided by a guide pipe provided in the sump pit.