JPH0743280A - Method and equipment of tankless pressure expansion test for pressure gas container - Google Patents

Abstract

PURPOSE:To allow highly accurate, highly reliable, quick measurement by eliminating the influence of residual air sumps in a gas container. CONSTITUTION:Upon finish of water supply into a gas container 2, a valve V8 is opened and a vacuum pump 26 functions to lower the pressure in the gas container 2 down to a predetermined level thus evacuating the line A2 again and injecting water therein to remove the residual air thoroughly. Subsequently, a pressure pump 3 functions to pressure feed water into the gas container 2 thus expanding the gas container 2. After sustaining that state for a predetermined time, pressurized water is returned through a return line LR back to a fixed quantity water tank 8. The weight reduction of water in the tank 8 corresponding to the volume of pressurized water is weighed by means of an electronic balance 9. A computer 92 operates a permanent increasing rate based on the total and permanent increasing volumes of pressurized water thus determining the pressure expansion performance of the gas container 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-expansion test method and apparatus for a high-pressure gas container, and in particular, in a non-aqueous tank pressure-expansion test, the air remaining in the high-pressure gas container to be inspected and in the spindle portion is completely removed. The present invention relates to an improvement of the non-aqueous tank pressure proof expansion test which removes and makes an accurate measurement.

[0002]

2. Description of the Related Art Generally, a high-pressure gas container used for liquefied petroleum gas or the like needs to be subjected to a pressure expansion test at the time of manufacture and every time a predetermined period elapses in order to inspect the safety in a pressurized state. This pressure-resistant expansion test is judged by the permanent increase rate obtained by the following formula (1), and if the permanent increase rate is equal to or less than a certain value stipulated by law, it is considered to pass. This is because a container having a smaller permanent increase rate has a larger restoring force and is excellent in pressure resistance.

[0003]

Here, the total increase amount (ΔV) is V ₂ −, where V _{1 is} the capacity of the gas container before pressurization and V ₂ is the capacity after pressurization.
V ₁ is a capacity increase due to expansion of the gas container, and the permanent increase amount (Δv) is V ₃ − when the capacity of the gas container when the pressure on the gas container is released is V _3.
The increase in capacity, which is represented by V ₁ , due to incomplete restoration of the gas container.

As a test device for measuring the total increase amount (ΔV) and the permanent increase amount (Δv), there are a water tank type and a non-water tank type. Of these, the water tank pressure-resistant expansion tester is installed in the water of a water tank in which the high-pressure gas container to be inspected is closed,
The high-pressure water container is pressed into the high-pressure gas container from the outside to a predetermined high pressure, and the amount of water discharged from the water tank due to the expansion of the high-pressure gas container at this time is determined by the water level in the burette provided in communication with the water tank. Is measured by detecting.

However, in such a water tank type pressure-resistant expansion tester, the amount of water discharged due to expansion generated in the high-pressure gas container is considerably smaller than the amount of water to be filled in the water tank in principle. Therefore, there is a drawback that the ratio of the signal to the whole is small and the measurement accuracy is low. Further, since a large amount of water is used in the water tank pressure-resistant expansion tester, the amount of fluctuation due to expansion and contraction of water caused by environmental temperature is large. This fluctuation amount causes an error with respect to the amount of water discharged due to the expansion of the high-pressure gas container to be detected, but it is not rare that the magnitude of this error exceeds the signal amount, that is, the amount of water to be detected. This drawback is remarkable especially when the water tank is large.

From the above circumstances, a non-water tank type pressure-expansion test device is generally used for a large high-pressure gas container. However, in the conventional non-aqueous tank pressure-resistant expansion tester, the volume of water changes momentarily due to the difference between the environmental temperature and the temperature of water, and the rate of change in the volume is large. The drawback is that it is difficult to do.

Therefore, the present applicant has previously filed Japanese Patent Application No. 58-858.
No. 00 (Japanese Patent Publication No. 63-52692), FIG.
We proposed a non-water tank type pressure-resistant expansion tester as shown in. This device has a fixed quantity water tank 8 for storing a predetermined amount of water 7 therein,
This quantitative water tank 8 and the gas container 2 to be inspected are connected via a pressurizing pump 3, and the water 7 in the quantitative water tank 8 is connected.
A pressurizing line Lp for pressurizing and supplying the gas into the gas container 2,
A return line LR which is formed in the pressurization line Lp and which also serves as the pressurization line Lp except for via the bypass 6 which bypasses the pressurization pump 3 and short-circuits, and which connects the fixed quantity water tank 8 and the gas container 2. The electronic balance 9 for mounting the quantitative water tank 8 and measuring the weight of the water 7 in the quantitative water tank 8 is a main component.

The fixed quantity water tank 8 is provided with a thermometer 5 for measuring the temperature of the water 7 stored therein and an overflow pipe 11 for maintaining a constant water level.
Further, a water supply line Ls ₁ is provided.

In the gas container 2 to be inspected, a spindle 23 is fixed to an attachment tool 22 screwed to a base 21 thereof, and a pressurization line Lp (return line LR), an air vent line LA and a water supply line are attached via the attachment tool 22. It is connected to Ls ₂ . 4 is a pressure gauge, VR is a return valve provided in the bypass 6, Vp is a valve provided in the pressurization line (return line LR), Vs is a water supply valve provided in the water supply line Ls ₂ , and VA is an air vent line LA. It is an air vent valve provided.

The electronic balance 9 is a microcomputer 91.
It is a digital display type balance having a built-in, and is connected to a computer 92. The connection position between the pressurization line Lp (return line LR) and the fixture 22 attached to the gas container 2 is slightly lower than the connection position between the pressurization line Lp (return line LR) and the fixed quantity water tank 8. Has been done.

According to the pressure-resistant expansion tester, the valve Vp is closed and the air vent valve VA and the water supply valve Vs are opened while the water supply to the pressurization line Lp, the bypass 6 and the pressurization pump 3 is completed, and the water supply line Ls ₂ Since the air in the gas container 2 is discharged from the air bleeding line LA by injecting more water into the gas container 2, if the water supply valve Vs and the air bleeding valve VA are closed here, a predetermined amount of water 7 Is stored. Next, the valve Vp of the pressurizing line Lp is opened and the return valve VR is closed, and then the pressurizing pump 3 is operated to pressurize water into the gas container 2 and expand the gas container 2 by this pressure. The pressure P is maintained for a predetermined period of time as required by law in the state where 2 is fully expanded. The weight ΔM ₁ of the reduced amount of the water 7 in the fixed quantity water tank 8 corresponding to the amount of press-fitted water at this time is weighed by the electronic balance 9, and the result is input to the computer 92 to be calculated based on a predetermined arithmetic expression. The amount of increase (ΔV) and the amount of permanent increase (Δv) can be obtained.

Next, the operation of the pressurizing pump 3 is stopped to release the pressurizing state and the return valve VR is opened. Then,
The gas container 2 is restored along with the release of the pressure, and the press-fitted water flows back into the quantitative water tank 8 through the return line LR. At this time, the weight ΔM ₂ of the increased amount of the water 7 in the quantitative water tank 8 is weighed by the electronic balance 9, and the result is calculated by the computer 9
The permanent increase rate can be automatically obtained by inputting the data in 2 and the calculation program and the necessary data.

[0014]

According to such a non-water tank type pressure-resistant expansion tester for a high-pressure gas container, the weight of the amount of water reduced or increased in the quantitative water tank instantaneously determined by an electronic balance and Since the volume of water is calculated from the density at the temperature of this water and the volume of water, it is not affected by the volume change of water due to thermal expansion that occurs over time, and it is not possible for individuals to make a mistaken visual reading or to have a different person making the measurement. There is no difference and you can get objective test results.
Since the data can be directly input to the computer by using the electronic balance, there is an advantage that the data processing can be easily automated. However, if air such as air pool due to environmental temperature etc. remains in the container to be inspected, there will be variations in the amount of permanent increase in the amount of water injected, which will result in inaccurate measurement results. Dots occur.

There are many places where air can be formed, for example, the inner welded portion of the neck ring of the gas container 2, the space for inserting the mirror portion into the barrel, the portion where oil is adhered when the internal cleaning is not complete, and the gas. A small amount of air dissolved in the water that is poured into the container, the inside of each valve such as the spindle, and the threaded portion are the causes of air accumulation.

Also in the example shown in FIG. 3, most of the air in the gas container 2 is discharged from the air bleeding line LA by opening the air bleeding valve VA and the water supply valve Vs to inject water into the gas container 2 from the water supply line Ls _2. However, it is difficult to completely remove the air generated in the place where the air pool is formed, which causes the above-mentioned measurement error.

The present invention has been made under the background as described above, and further improves the non-aqueous tank type pressure-resistant expansion tester proposed by the above-mentioned Japanese Patent Application No. 58-85800.
It is an object of the present invention to provide a non-water tank type pressure-expansion tester for a high-pressure gas container that can quickly perform highly accurate and reliable measurements without being affected by air pools caused by environmental temperature. is there.

[0018]

In order to achieve the above-mentioned object, the present invention press-fits the water in the quantitative water tank into the gas container to be inspected and expands it, and returns the press-fitted water to the quantitative water tank. In the non-aqueous tank pressure expansion test method that inspects the pressure expansion performance of the gas container from the amount of water decrease at the time, as a previous step, open the air vent valve with the water supply in the gas container completed and open the vacuum pump. The operation lowers the pressure in the gas container to the specified pressure, stops the operation of the vacuum pump, and then performs air bleeding again to completely remove the air remaining in the gas container and apply the pressure on the pressurizing line. The pressure pump is operated to pressurize water into the gas container to expand the gas container, and after holding for a predetermined time, the press-fitted water is returned to the quantitative water tank through the return line, and corresponds to the amount of the press-fitted water at this time. Reduction of water in fixed quantity water tank The weight of the high pressure gas container is measured by an electronic balance, the result is input to a computer, and the permanent increase rate is calculated from the total increase amount of the injected water and the permanent increase amount to determine the pressure expansion performance. An aquarium pressure expansion test method and apparatus are provided.

Moisture sucked together with air from the gas container is separated from air by a water separator, and the water is discharged to a drain line from a drain valve attached to one end of the water separator.

[0020]

[Operation] As a pre-process, a fixed amount of water is injected into the quantitative water tank, and water is injected into the gas container from the water injection line of the gas container with the pressure line and the pressure pump being completely supplied with water.
Next, the pressure inside the gas container is lowered to a predetermined pressure by opening the air draining water drain valve of the gas container and driving the vacuum pump. Then, after closing the valve on the vacuum pump side, stop driving the vacuum pump and perform air bleeding again from the air bleeding line, so that the air remaining in the gas container and the air reservoir of each valve is completely removed. Will be removed. The moisture sucked together with the air from the gas container is separated from the air by the water separator and discharged.

Next, the pressurizing pump on the pressurizing line is operated to press-fit the water in the quantitative water tank into the gas container, and the pressure causes the gas container to expand to maintain the pressure for a predetermined time. The weight of the reduced amount of water in the fixed-quantity water tank corresponding to the amount of injected water at this time is weighed by an electronic balance, input to the computer together with the injection temperature at that time, and the total increase amount and permanent increase amount based on the calculation formula. Is calculated to obtain the permanent increase rate.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a non-water tank type pressure-resistant expansion test method and apparatus for a high-pressure gas container according to the present invention will be described below with reference to the drawings. Explain. In the configuration shown in FIG. 1, 2 is a gas container to be inspected, 8 is a quantitative water tank in which a predetermined amount of water 7 is stored, and the quantitative water tank 8 and the gas container 2 are the pressure pump 3 Connected through.

The fixed quantity water tank 8 is provided with a water supply line Ls _{1 provided} with a water supply valve V ₁ . An air bleeding water injection line A ₁ is connected to the water supply line Ls ₁ . Reference numeral 9 is an electronic balance on which the quantitative water tank 8 is placed and which measures the weight of the water 7 in the quantitative water tank 8.

The electronic balance 9 is a digital display type balance having a microcomputer incorporated therein, and the electronic balance 9 is connected to a computer 92. This computer 9
The water injection temperature 93 of the quantitative water tank 8 is input to 2 and the necessary data is input from the keyboard 94, and the calculation result based on the calculation formula described later is displayed on the printer 95.
Is output from.

On the other hand, Lp is the water 7 in the quantitative water tank 8.
Is a pressurizing line for pressurizing and supplying the gas into the gas container 2,
In the pressurization line Lp, a bypass 6 with a valve V ₁₀ that bypasses the pressurization pump 3 and short-circuits is arranged. L
R is a return line provided with a return valve V ₂ for connecting the fixed quantity water tank 8 and the gas container 2.

In the gas container 2 to be inspected, a spindle 23 is screwed and fixed to its base 21, and the spindle 23 is
The pressurization line Lp (return line LR) provided with a pressurization / depressurization valve V _3, the pressure gauge 24 provided with a pressure gauge valve V _4, and the air vent water injection line A _{2 provided} with an air vent water injection valve V _5. , An air vent water vent valve V ₈ and an air vent water injection pressure vent valve V ₉ are connected.

Reference numeral 25 is a water separator connected to the air draining water drain valve V ₈ and one end of this water separator 25 is connected to the water draining line A ₃ via the water draining valve V ₆ to provide a water separator. The other end of 25 is connected to a vacuum pump 26 via a pump suction valve V ₇ . 27 is a vacuum gauge and 28 is a pressure switch.

The operation of the non-aqueous tank pressure-resistant expansion tester will be described below. First, the total increase amount (ΔV) and the permanent increase amount (Δv) of the gas container 2 are obtained by the following operations. As pre-process wherein, by opening the water supply valve V _1, is injected into the quantitative water tank 8 a certain amount of water the air vent has been subjected by the venting injection line A ₁ from the water supply line Ls _1. Then, in a state where water supply to the pressurizing line Lp, the bypass 6 and the pressurizing pump 3 is completed, the air vent water pouring pressure vent valve V ₉ is closed and the air vent water pouring valve V ₅ is opened to inject water into the gas container 2 from the air vent water pouring line A _2. To do.

Next, after closing the pressurizing / depressurizing valve V ₃ , the valve V ₅ and the water draining valve V ₆ , the suction valve V ₇ and the air draining water draining valve V ₈ are opened to start the driving of the vacuum pump 26 to start the vacuum gauge. Under the supervision of 27, the pressure switch 28 acts to reduce the pressure in the gas container 2 to a predetermined pressure. Next, the valve V ₈ is closed, the driving of the vacuum pump 26 is stopped, the valve V ₅ is opened, and the air bleeding water injection is performed again from the air bleeding water injection line A ₂ . In this way, the air remaining in the gas container 2, the spindle 23 and the air reservoir of each valve can be completely removed and filled with water.

Since the water sucked together with air from the gas container 2 is separated from the air in the water separator 25, the water drain valve V ₆ attached to one end of the water separator 25 is opened to drain water. Discharge to line A ₃ . Since the inside of the water separator 25 is maintained in a vacuum state by the vacuum pump 26, it is assumed that the water in the spindle 23 and the gas container 2 is 50%.
Even if the cc air pool remains, it can be sucked in 2 to 3 seconds.

Next, after closing the valve V ₅ and opening the pressurizing / depressurizing valve V ₃ , the pressurizing pump 3 on the pressurizing line Lp is operated to press the water 7 in the quantitative water tank 8 into the gas container 2. Then, the gas container 2 is expanded by this pressure. The pressure P is maintained for a predetermined time specified by law in a state where the gas container 2 is completely expanded. The weight ΔM ₁ of the reduced amount of the water 7 in the quantitative water tank 8 corresponding to the amount of press-fitted water at this time is weighed by the electronic balance 9, and the data is input to the computer 92 together with the injection temperature 93 at that time.

FIG. 2 is a schematic diagram showing the operating state of the quantitative water tank. A'is the amount of water injected into the gas container 2 at a predetermined pressure, which is the total increase amount (ΔV) in the above equation (1). Equivalent to. Further, B ′ is the amount of water that has not been returned through the return line LR in the water that has been press-fitted into the gas container 2, and corresponds to the permanent increase amount (Δv). The presence of an air pool in the gas container 2 increases the amount of press-fitted water A ′, and also reduces the amount of return due to the dissolution of air during pressurization, thus increasing the amount of water B ′.

On the other hand, the total increase amount (Δ
V) is calculated by the following equation (2) using the obtained amount A of injected water. V: Internal volume of gas container 2 (cc) P: Pressure in pressure resistance test (kg / cm ² ) A: Amount of water injected at pressure resistance test pressure (cc) B: Connection from hydraulic pump at pressure resistance test pressure P to container inlet Amount of water pressed into pipe (amount of water pressed into other than container) (cc) βt: Compression coefficient at temperature t of water during pressure resistance test.

The press-fitted water amount A in the equation (2) is obtained by the following equation (3), where ρ is the density of water at the test temperature.

The permanent increase amount (Δv) is calculated by the following equation (4), where ρ is the density of water at the test temperature.

Next, the operation of the pressurizing pump 3 is stopped to release the pressurizing state, whereby the gas container 2 is restored, and the press-fitted water flows back into the quantitative water tank 8 through the return line LR.
Weight ΔM of the increased amount of water 7 in the fixed quantity water tank 8 at this time
₂ is weighed by the electronic balance 9, and the result is input to the computer 92.

Then, the permanent increase rate can be automatically obtained by inputting the arithmetic programs of equations (1) to (4) and necessary data to the computer 92.

[0038]

As described in detail above, according to the non-aqueous tank pressure-resistant expansion test method and apparatus of the present invention, water is injected into the gas container to be inspected, and then the vacuum pump is driven to move the gas inside the gas container. By reducing the pressure to a predetermined pressure and re-injecting water from the air bleeding water injection line, the air remaining in the gas container and the air reservoir of each valve can be completely removed. Then, the pressurizing pump is operated to press-fit the water in the quantitative water tank into the gas container, expand the gas container by this pressure and maintain the pressure for a predetermined time, and the quantitative amount corresponding to the amount of the press-fitted water at this time. The permanent increase rate can be obtained by weighing the reduced amount of water in the water tank by an electronic balance and inputting it to the computer together with the injection temperature at that time to calculate the total increase amount and the permanent increase amount.

Therefore, since it is possible to almost completely eliminate the air pool due to the environmental temperature in the container to be inspected, it is possible to eliminate the variation in the amount of water to be injected and to quickly perform highly accurate and highly reliable measurement. It is possible to provide a non-aqueous tank pressure resistance expansion tester for a high-pressure gas container.

[Brief description of drawings]

FIG. 1 is a schematic diagram generally showing a non-aqueous tank pressure proof expansion test apparatus according to the present invention.

FIG. 2 is a schematic diagram showing an operating state of the quantitative water tank according to the present embodiment.

FIG. 3 is a schematic diagram generally showing a conventional non-aqueous tank pressure-resistant expansion test device.

[Explanation of symbols]

2 ... Gas container 3 ... Pressure pump 4 ... Pressure gauge 6 ... Bypass 7 ... Water 8 ... Quantity water tank 9 ... Electronic balance 21 ... Base 23 ... Spindle 25 ... Water separator 26 ... Vacuum pump 27 ... Vacuum gauge 28 ... Pressure switch 92 ... computer Lp ... pressure line LR ... return line A _1, A ₂ ... vent irrigation line A ₃ ... drain line Ls ₁ ... waterlines V ₁ ... water supply valve V ₂ ... return valve V ₃ ... pressure reducing valve V ₄ … Pressure gauge valve V ₅ , V ₈ … Air vent water injection valve V ₆ … Water vent valve V ₇ … Pump suction valve V ₉ … Air vent Water injection pressure vent valve

Claims (4)

[Claims] 1. The pressure-resistant expansion performance of the gas container is inspected from the amount of decrease in the amount of water when the water in the quantitative water tank is press-fitted into the gas container to be inspected and expanded, and the press-fitted water is returned to the quantitative water tank. In the non-water tank pressure resistance expansion test method, as a previous step, open the air vent valve when the water supply to the gas container is completed, and operate the vacuum pump to reduce the pressure in the gas container to the specified pressure. After stopping the operation of, the air remaining in the gas container is completely removed by performing air bleeding and injection again, and the pressurizing pump on the pressurizing line is operated to pressurize the water into the gas container. Inflate the gas container and return it to the quantitative water tank via the return line after holding it for a predetermined time.Weigh the amount of water decrease in the quantitative water tank corresponding to the amount of the pressurized water at this time by an electronic balance. Compiling the results Enter the over data, total increase and non-water tank-type withstand expansion test method of high-pressure gas container, characterized in that by calculating a permanent increase from permanent increment to determine the breakdown voltage expansion performance of the press water. 2. The water which is sucked together with air from the gas container is separated from the air by a water separator, and the water is discharged from a water drain line by opening a water drain valve attached to one end of the water separator. The non-water tank pressure expansion test method for a high-pressure gas container according to claim 1. 3. A quantitative water tank, a pressurizing line having a pressurizing pump for pressurizing the water in the quantitative water tank into a high-pressure gas container to be inspected, a press-fitting step by the pressurizing pump, and a subsequent standing. After the step, a return line for returning the press-fitted water in the high-pressure gas container to the quantitative water tank, an electronic balance for measuring the weight of water in the quantitative water tank, and an electronic balance connected to the electronic balance are provided. In a non-aqueous tank pressure-resistant expansion tester equipped with a computer that calculates the increase in the capacity of the high-pressure gas container, connect a vacuum pump to the air vent valve attached to the gas container, and inject water into the gas container. A non-water tank type pressure-expansion test device for a high-pressure gas container, which is characterized in that air remaining in the gas container is completely removed later. 4. The high-pressure gas container according to claim 3, further comprising a water separator disposed between the vacuum pump attached to the gas container and the vacuum pump to separate the moisture sucked together with the air from the air. Non-aqueous tank pressure expansion tester.