CN211505029U - Thin-wall double-cavity common-bottom structure storage tank pressure-bearing test equipment - Google Patents
Thin-wall double-cavity common-bottom structure storage tank pressure-bearing test equipment Download PDFInfo
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- CN211505029U CN211505029U CN201922411625.8U CN201922411625U CN211505029U CN 211505029 U CN211505029 U CN 211505029U CN 201922411625 U CN201922411625 U CN 201922411625U CN 211505029 U CN211505029 U CN 211505029U
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Abstract
The utility model provides a thin-wall double-cavity common-bottom structure storage tank bearing test device, which comprises a pressure measuring device and a filling pipeline; the pressure measuring device comprises an upper box front end pressure measuring device for measuring the highest point pressure of the upper box of the storage box, an upper box rear end pressure measuring device for measuring the lowest point pressure of the upper box of the storage box, a lower box front end pressure measuring device for measuring the highest point pressure of the lower box of the storage box and a lower box rear end pressure measuring device for measuring the lowest point pressure of the lower box of the storage box; the filling pipeline is divided into two paths, one path is communicated with a filling port of an upper tank of the storage tank, and an upper tank filling and discharging control valve is arranged on the pipeline of the path; the other path is communicated with a filling port of a lower tank of the storage tank, and a lower tank charging and discharging control valve is arranged on a pipeline of the path. Through the utility model discloses an equip, can realize that the case substep is harmonious about can realizing, accomplish the bearing test of total bottom structure storage tank, ensured total bottom storage tank test safety.
Description
Technical Field
The utility model belongs to the technical field of the storage tank test, especially, relate to a thin wall two-chamber is total to end structure storage tank pressure-bearing test and is equipped.
Background
After the carrier rocket fuel storage tank is assembled and welded, the manufacturing quality of the carrier rocket fuel storage tank needs to be comprehensively checked through a pressure bearing test. The traditional storage tank is generally of a single-tank structure, and the traditional storage tank is directly filled with test media to be tested. The 5-meter-diameter thin-wall common-bottom storage tank is a split structure with the size which is adopted for the first time in China, the storage tank is separated into an upper sub-tank and a lower sub-tank through common bottom, wherein the common bottom is formed by overlapping and sleeving two thin-wall spherical tank bottoms, and the interlayer part in the middle is filled with a heat-insulating material. Due to the special structure, the common bottom deformation caused by the pressure change of the upper and lower branch boxes can cause the pressure between the upper and lower branch boxes to be redistributed, and further the mutual influence of the pressure between the upper and lower branch boxes is caused. Meanwhile, the common-bottom special thin-wall interlayer structure also determines that the common bottom is not allowed to bear overload or negative pressure, and damage to the common-bottom double thin walls and the interlayer is avoided.
The pressure-bearing test process can be divided into 7 stages, such as a preparation stage before the test, a filling stage, a pressurizing and pressure-maintaining stage, a pressure-releasing stage, a medium discharging stage, a post-test treatment stage, a welding line inspection stage and the like. At present, the pressure-bearing test of a single-tank structure storage tank is carried out in a way that the storage tank is erected, the storage tank is placed on a test base, filling or inflation is carried out from a flange connecting pipeline at the rear bottom side of the storage tank, and test processes such as pressurization and pressure maintaining are carried out under the control of a test bench.
The existing storage tanks are of single-tank structures, and the problem that mutual deformation between an upper tank and a lower tank of a split type storage tank influences coordination is not involved, so that the split type common-bottom storage tank pressure-bearing test cannot be realized by the existing technical scheme and the technical method.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a thin wall two-chamber is total to end structure storage tank pressure-bearing test and is equipped, the utility model discloses to the split type special construction pressure-bearing test demand of the total end storage tank of major diameter (can be used to 5 meter diameter) thin wall two-chamber, the utility model relates to a one set of safe and reliable's pressure-bearing test is equipped, can realize flow formula process scheme through this pressure-bearing test equipment, realizes total to end structure storage tank's pressure-bearing test through the mode that upper and lower case substep was harmonious, has ensured total to end storage tank test safety.
In order to achieve the above purpose, the technical scheme of the utility model is realized like this:
a thin-wall double-cavity common-bottom structure storage tank pressure-bearing test device comprises a pressure measuring device and a filling pipeline;
the pressure measuring device comprises an upper box front end pressure measuring device for measuring the highest point pressure of the upper box of the storage box, an upper box rear end pressure measuring device for measuring the lowest point pressure of the upper box of the storage box, a lower box front end pressure measuring device for measuring the highest point pressure of the lower box of the storage box and a lower box rear end pressure measuring device for measuring the lowest point pressure of the lower box of the storage box;
the filling pipeline is divided into two paths, one path is communicated with a filling port of an upper tank of the storage tank, and an upper tank filling and discharging control valve is arranged on the pipeline of the path; the other path is communicated with a filling port of a lower tank of the storage tank, and a lower tank charging and discharging control valve is arranged on a pipeline of the path;
the device also comprises an upper box exhaust/air supplement device connected with the top end of the upper box of the storage box and a lower box exhaust/air supplement device communicated with the lower box of the storage box.
The other end of the filling pipeline is connected with equipment capable of filling media and pressurizing, and equipment in the prior art is adopted, so long as filling, pressurizing, discharging and pressure relief can be realized, and equipment capable of realizing respective functions can be respectively adopted and respectively communicated with the filling pipeline. An integrated set of equipment can also be adopted to realize several functions simultaneously, for example, a 5M-level tank volume calibration device disclosed in Chinese patent CN201510064006 can directly connect the filling pipeline of the application with the tank hydraulic volume calibration device in the application.
Furthermore, the filling port of the upper box is positioned at the bottom end of the side surface of the upper box of the storage box, and the upper box exhaust/air supplement device is positioned at the top of the upper box of the storage box; the filling port of the lower tank is positioned at the bottom end of the lower tank of the storage tank.
Further, the pressure measuring device at the front end of the upper box is arranged at the top end of the upper box of the storage box, and the pressure measuring device at the rear end of the upper box is arranged at the bottom end of the upper box of the storage box; the lower box rear end pressure measuring device is arranged at the bottom end of the lower box of the storage box.
Further, the air exhaust/supplement pipe can extend to the top end of the lower tank of the storage tank; the lower box front end pressure measuring device and the lower box exhaust/air supplement device are arranged on the exhaust/air supplement pipe.
Further, the device also comprises an upper tank emergency discharge device and a lower tank emergency discharge device which are connected with the top end of the storage tank; the lower box emergency discharge device is connected with an exhaust/air supplement pipe;
the pressure measurement monitoring points are arranged at the front end and the rear end of the upper tank and the lower tank of the common-bottom storage tank, so that the highest point pressure and the lowest point pressure of the upper tank and the lower tank are monitored in real time. In order to prevent the tanks from being over-pressurized, emergency discharge means are provided in the upper and lower tanks, respectively, in association with the upper and lower tank maximum point pressure measuring means, which discharge when the upper pressure setting limit is exceeded. The emergency discharge device is associated with the pressure measuring device at the highest point of the upper box and the lower box, the existing control system can be adopted to realize automatic control, and the numerical value of the pressure measuring device can be observed by an operator to manually start the emergency discharge device.
Furthermore, an upper tank filling and changing liquid level device and a lower tank filling and changing liquid level device are respectively arranged on pipelines of the filling pipeline, which are communicated with the upper tank and the lower tank of the storage tank;
furthermore, the device also comprises a point position liquid level sensor connected with the top end of the storage tank.
The filling and discharging processes of the upper tank and the lower tank are controlled by arranging two paths of adjusting stop valves on the filling pipeline. In order to determine the filling starting point, a filling change liquid level device (namely, a change liquid level sensor) is arranged at a position before the test medium flows into the storage tank, and the sensor trigger point is used as the filling starting point to start recording the medium flowing into the tank. The upper tank filling termination point is arranged at the top end of the storage tank, and the upper tank filling is stopped after the sensor is triggered. Due to the structural particularity of the lower box, the filling termination point is set to be the time when the test medium flows out of the exhaust/air supplement pipe. The back-venting process is a filling simulation process, and the back-venting is stopped after the change-giving liquid level sensor is triggered.
Further, the upper box front end pressure measuring device, the upper box rear end pressure measuring device, the lower box front end pressure measuring device and the lower box rear end pressure measuring device are all pressure measuring sensors;
furthermore, the upper box exhaust/air supplement device and the lower box exhaust/air supplement device are exhaust/air supplement valves.
The exhaust/air supplement devices are respectively arranged on the upper tank and the lower tank and are respectively associated with the highest point pressure measuring devices of the upper tank and the lower tank, so that the gas in the tank is exhausted in the filling process of the storage tank and the air in the tank is supplemented in time in the medium discharging process. The upper tank air exhausting and supplementing device is arranged at the top end of the storage tank, the lower tank air exhausting and supplementing device is arranged at the outlet end of the lower tank air exhausting and supplementing pipe, the air exhausting/supplementing device is in an open state in the filling process, gas in the tank is exhausted in real time, and the tank is closed after filling is completed. When the pressure relief of the storage tank is completed in the pressure bearing test, and the pressure value displayed by the highest point pressure measuring device of the upper tank and the lower tank is close to 0, the air exhausting/supplementing device is opened to realize the communication between the upper tank and the lower tank and the atmospheric environment.
In order to ensure the test safety of the common-bottom special structure, the common-bottom structure is not allowed to bear negative pressure in the whole pressure-bearing test period, namely the pressure of the upper end of the common bottom is not higher than that of the lower end. The pressure of the common bottom upper end and the common bottom lower end is monitored by monitoring the pressure measuring device at the rear end of the upper box and the pressure measuring device at the front end of the lower box in real time, and is associated with the emergency discharging device. Meanwhile, in order to avoid the occurrence of the state that the pressure value of the pressure measuring device at the rear end of the upper box is higher than that of the pressure measuring device at the front end of the lower box, the processes of filling, pressurizing, pressure relief and back leakage are carried out in a gradually alternating small step size coordination mode.
A method for carrying out pressure-bearing deformation test by using the pressure-bearing test equipment of the thin-wall double-cavity common-bottom structure storage tank comprises the following steps,
1) turning the storage tank from a horizontal state to a vertical state, placing the storage tank on a test base, and connecting related pipelines and devices (including a measuring sensor, an air exhausting and supplementing device, an emergency discharging device and the like);
2) in order to avoid the influence of the pressure difference between the upper tank and the lower tank on the common bottom, the sequence of firstly discharging the lower tank and then discharging the upper tank is adopted for filling; the top of the lower box is of a common-bottom closed structure, so that gas in the lower box cannot be directly discharged, and therefore, when the lower box is filled, the gas in the lower box is discharged through the lower box gas discharging/supplementing device; the lower box is filled by adopting a flange at the rear bottom end, after the lower box is filled, the lower box exhaust/air supplement device is sealed, then the lower box is pressurized, and the pressure is applied by taking the self-weight pressure of the water column of the upper box as a reference; when the upper box is filled, the gas in the upper box is exhausted through the upper box exhaust/gas supplement device; the upper tank is filled by adopting a mode of filling from a side flange of the storage tank and exhausting from a top flange, and the lower tank needs to be highly concerned in the filling process.
3) After filling, the upper tank and the lower tank are alternately coordinated to pressurize, the pressure of the upper tank is not higher than that of the lower tank at any time, and the pressure difference between the upper side and the lower side of the common bottom is not higher than the single bottom examination pressure; pressurizing to a target examination pressure, maintaining the pressure, and then carrying out visual inspection on the welding line and the interface position of the box body;
4) after pressurization is finished, the upper box and the lower box are alternately coordinated to release pressure, the pressure of the upper box is not higher than that of the lower box at any time, and the pressure difference between the upper side and the lower side of the common bottom is not higher than the single bottom examination pressure;
5) after pressure relief is finished, the upper box and the lower box are alternately coordinated to recover a test medium, and air needs to be supplied into the boxes in real time in the process of pressure relief, so that negative pressure is prevented from being generated in the boxes;
6) and (3) removing related pipelines and devices, drying residual test media in the tank, and after drying is completed, carrying out visual inspection on all welding lines on the inner surface and the outer surface of the storage tank to confirm that the weld lines are flawless.
Preferably, said step 2) comprises the following operating steps,
a) closing the upper tank leakage control valve, opening the lower tank leakage control valve to communicate the lower tank with the filling pipeline, and opening the lower tank exhaust/gas supplementing device to communicate the lower tank with the external atmospheric environment;
b) in the filling process, gas in the lower box is discharged through the lower box gas discharging/supplementing device, the pressure measuring device at the front end of the lower box and the pressure measuring device at the rear end of the lower box are monitored, the pressure is strictly forbidden to exceed 1/2 of the pressure-bearing test pressure of a product, the overpressure of the product is avoided, and if the pressure is increased, the filling flow needs to be adjusted;
c) stopping filling the lower box and closing the lower box filling and discharging control valve after the lower box exhausting/air supplementing device has water flowing out; when the lower box exhaust/air supplement device does not flow water any more, the lower box exhaust/air supplement device is closed;
d) the lower tank is pressurized in a pressure water squeezing mode, and the pressurizing pressure is based on the pressure capable of offsetting the self weight of the water column of the upper tank, so that the common bottom is prevented from bearing negative pressure;
e) opening an upper tank charging and discharging control valve to enable the upper tank to be communicated with a charging pipeline, and opening an upper tank exhaust/gas supplementing device to enable the upper tank to be communicated with the external atmospheric environment;
f) in the filling process, gas in the tank is discharged through the upper tank gas discharging/supplementing device, the pressure measuring device at the front end of the upper tank and the pressure measuring device at the rear end of the upper tank are monitored, the pressure is strictly forbidden to exceed 1/2 of the pressure-bearing test pressure of a product, the overpressure of the product is avoided, and if the pressure is increased, the filling flow needs to be adjusted;
g) in the process of filling the upper box, attention needs to be paid to monitoring a pressure measuring device at the front end of the lower box and a pressure measuring device at the rear end of the lower box, and the lower box is decompressed through an exhaust/air supplement device of the lower box when the lower box is close to the pressure-bearing test pressure;
h) and (4) filling the upper tank to the top end of the storage tank, triggering the point position liquid level sensor, stopping filling, and closing the upper tank filling and discharging control valve and the upper tank exhaust/air supplement device.
Preferably, step 3) comprises the following operating steps,
a) pressurizing the lower box in a pressure water squeezing mode, checking the interfaces of a plugging cover, a pipeline, a valve, a sensor and an instrument which are connected with the lower box after pressurizing to the inspection pressure (generally 0.2MPa), and continuously pressurizing after confirming that no leakage exists;
b) in the process of pressurizing the lower box, attention needs to be paid to monitoring a pressure measuring device at the front end of the upper box and a pressure measuring device at the rear end of the upper box, so that overpressure of the upper box caused by bottom-sharing deformation of the lower box during pressurization is prevented, and if the upper box is close to a pressure-bearing test pressure, pressure is relieved through an upper box exhaust/gas supplementing device;
c) pressurizing to a lower box target examination pressure, maintaining the pressure, and then carrying out visual inspection on the welding line and the interface position of the lower box to detect whether the problems exist (whether cracks exist, leakage and the like);
d) pressurizing the upper box in a pressure water squeezing mode, checking the interfaces of a plugging cover, a pipeline, a valve, a sensor and an instrument which are connected with the upper box after pressurizing to the inspection pressure (generally 0.2MPa), and continuously pressurizing after confirming that no leakage exists;
e) the front end pressure measuring device of the lower box and the rear end pressure measuring device of the lower box need to be monitored in the pressurizing process of the upper box, because the upper box is pressurized and deforms at the same bottom, the pressure of the lower box can be increased along with the increase of the pressure of the upper box, when the lower box exceeds the range of the pressure-bearing test pressure +/-0.005 MPa, the lower box is used for releasing pressure through the lower box exhaust/air supplement device, the upper box is pressurized after the pressure is released to the lower limit of the range of the test pressure +/-0.005 MPa, and the steps are repeated until the upper box is pressurized to the target examination pressure;
f) and (4) pressurizing to the upper box target examination pressure, maintaining the pressure, and then carrying out visual inspection on the welding line and the interface position of the upper box to detect whether the problems exist (whether the problems exist in cracks, leakage and the like).
Preferably, step 4) comprises the following steps,
a) opening an upper tank leakage control valve, releasing pressure of the upper tank in a mode of slowly returning water through a filling pipeline, opening an upper tank exhaust/gas supplementing device when the pressure of the front end of the upper tank is close to 0, communicating the interior of the upper tank with the external atmosphere, completing the pressure release of the upper tank, and closing the upper tank leakage control valve;
b) opening a lower tank leakage control valve, releasing pressure of the lower tank in a mode of slowly returning water through a filling pipeline, stopping releasing pressure after the pressure at the front end of the lower tank is close to the initial protection pressure, and closing the lower tank leakage control valve;
the step 5) comprises the following steps of,
a) opening an upper tank leakage control valve, recovering the test medium in the upper tank by adopting a water pump pumping mode, and closing the upper tank leakage control valve after recovery is finished;
b) opening the lower box exhaust/air supplement device, and relieving residual pressure in the lower box to enable the lower box exhaust/air supplement device to be in a normally open state;
c) and opening the lower box leakage control valve, recovering the test medium in the lower box by adopting a water pump pumping-back mode, supplementing air into the box through the lower box exhaust/air supplement device in the recovery process, and closing the lower box leakage control valve after recovery is finished.
After the test is finished, the related test pipelines, the measuring sensor, the air exhausting and supplementing device, the emergency discharging device and the like are dismantled, and the residual test medium in the tank is dried after the storage tank is put on shelf.
And after drying, visually inspecting all welding seams on the inner surface and the outer surface of the storage box to determine whether the defects such as cracks, corrosion and the like exist. And scraping and removing the surface defects found by inspection, if the thickness of the surface defects is less than the thickness of the base body of the welding area after removal, performing repair welding, and performing pressure-bearing test examination again after repair welding.
A method for measuring the volume by using the thin-wall double-cavity common-bottom structure storage tank pressure-bearing test equipment comprises the following steps,
a) closing the upper tank leakage control valve, opening the lower tank leakage control valve to communicate the lower tank with the filling pipeline, and opening the lower tank exhaust/gas supplementing device to communicate the lower tank with the external atmospheric environment;
b) confirming a lower tank filling starting point through a lower tank filling and changing liquid level device, and starting to cumulatively calculate the mass of a medium flowing into the lower tank;
c) in the filling process, gas in the lower box is discharged through the lower box gas discharging/supplementing device, and the pressure measuring device at the front end of the lower box and the pressure measuring device at the rear end of the lower box are monitored (the pressure is strictly higher than 1/2 of the pressure-bearing test pressure of a product;
d) stopping filling the lower tank after the lower tank exhaust/air supplement device has water flowing out, closing a lower tank filling and discharging control valve, and recording the accumulated mass m2 of filling the lower tank; when the lower box exhaust/air supplement device does not flow water any more, closing the lower box exhaust/air supplement device, recording the mass of the medium accumulated and discharged by Q2, and subtracting m2 to obtain the mass of the medium in the lower box;
e) pressurizing the lower tank in a pressure water squeezing mode, wherein the pressurizing pressure is based on the pressure capable of offsetting the self weight of the water column of the upper tank;
f) opening an upper tank charging and discharging control valve to enable the upper tank to be communicated with a charging pipeline, and opening an upper tank exhaust/gas supplementing device to enable the upper tank to be communicated with the external atmospheric environment;
g) confirming an upper tank filling starting point through an upper tank filling and changing liquid level device, and starting to cumulatively calculate the mass of a medium flowing into the upper tank;
h) in the filling process, gas in the tank is discharged through the upper tank gas discharging/supplementing device, the pressure measuring device at the front end of the upper tank and the pressure measuring device at the rear end of the upper tank are monitored, and the pressure is forbidden to exceed 1/2 of the pressure-bearing test pressure of a product;
i) in the process of filling the upper box, attention needs to be paid to monitoring a pressure measuring device at the front end of the lower box and a pressure measuring device at the rear end of the lower box, and the lower box is decompressed through an exhaust/air supplement device of the lower box when the lower box is close to the pressure-bearing test pressure;
j) after the upper tank stops filling, closing the upper tank filling and discharging control valve and the upper tank exhaust/air supplement device, and recording the upper tank filling accumulated mass m 1; if the box is not filled, the medium is added through the measuring cup, the adding amount is recorded, and the adding amount is added with m1 to obtain the medium quality in the upper box.
Compared with the prior art, the utility model relates to a thin wall two-chamber is total to end structure storage tank pressure-bearing test equipment and test method, have following advantage:
(1) experimental equipment, can realize sharing the pressure-bearing test of end structure storage tank to major diameter thin wall two-chamber, through the setting of pressure measurement device, exhaust air supplement unit, filling pipeline etc. realize pressure measurement and urgent emission control, filling and let out the terminal point and discharge air supplement control, share end pressure-bearing coordinated control etc to guarantee sharing the pressure-bearing test's of end structure storage tank safe and reliable.
(2) Pressure-bearing test equipment to the open test equipment is the basis, has formed the coordinated pressure-bearing test method that distributes of major diameter thin wall two-chamber common bottom structure storage tank.
(3) The test equipment of the utility model is not only suitable for the bearing test requirement of the common-bottom storage tank, but also can meet the bearing test requirement of various pressure containers such as tank bodies; simultaneously the utility model discloses can also realize the volumetric measurement of total end storage tank.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:
fig. 1 is a schematic diagram of a simple structure of a test rig according to an embodiment of the present invention;
fig. 2 is a flowchart of the test according to the embodiment of the present invention.
Description of reference numerals:
1. an upper tank charging and discharging control valve; 2. a lower tank charging and discharging control valve; 3. an upper box exhaust/air make-up device; 4. a lower box exhaust/air make-up device; 5. the upper box is filled with a liquid level device for giving change; 6. a lower tank filling and changing liquid level device; 7. a pressure measuring device at the front end of the upper box; 8. a pressure measuring device at the rear end of the upper box; 9. a lower box front end pressure measuring device; 10. a lower box rear end pressure measuring device; 11. an upper tank emergency drain; 12. a lower tank emergency drain; 13. an exhaust/air supplement pipe; 14. bottom sharing; 15. a filling pipeline; 16. and a point position liquid level sensor.
Detailed Description
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
A thin-wall double-cavity common-bottom structure storage tank pressure-bearing test device comprises a pressure measuring device and a filling pipeline 15;
the pressure measuring device comprises an upper box front end pressure measuring device 7 for measuring the highest point pressure of an upper box of the storage box, an upper box rear end pressure measuring device 8 for measuring the lowest point pressure of the upper box of the storage box, a lower box front end pressure measuring device 9 for measuring the highest point pressure of a lower box of the storage box, and a lower box rear end pressure measuring device 10 for measuring the lowest point pressure of the lower box of the storage box;
the filling pipeline 15 is divided into two paths, one path is communicated with a filling port of an upper tank of the storage tank, and an upper tank filling and discharging control valve 1 is arranged on a pipeline of the path; the other path is communicated with a filling port of a lower tank of the storage tank, and a lower tank charging and discharging control valve 2 is arranged on a pipeline of the path;
the device also comprises an upper box exhaust/air supplement device 3 connected with the top end of the upper box of the storage box and a lower box exhaust/air supplement device 4 communicated with the lower box of the storage box.
The filling port of the upper tank is positioned at the bottom end of the side surface of the upper tank of the storage tank, and the upper tank air exhausting/supplementing device 3 is positioned at the top of the upper tank of the storage tank; the filling port of the lower tank is positioned at the lower end of the lower tank of the storage tank;
the upper box front end pressure measuring device 7 is arranged at the top end of the upper box of the storage box, and the upper box rear end pressure measuring device 8 is arranged at the bottom end of the upper box of the storage box; the lower tank rear end pressure measuring device 10 is arranged at the bottom end of the lower tank of the storage tank.
Also includes an exhaust/air supplement pipe 13 which can extend to the top end of the lower tank of the storage tank; the lower box front end pressure measuring device 9 and the lower box exhaust/air supplement device 4 are arranged on an exhaust/air supplement pipe 13.
The device also comprises an upper tank emergency discharge device 11 and a lower tank emergency discharge device 12 which are connected with the top end of the storage tank; the lower box emergency discharge device 12 is connected with an exhaust/air supplement pipe 13;
an upper tank filling and changing liquid level device 5 and a lower tank filling and changing liquid level device 6 are respectively arranged on pipelines of the filling pipeline 15 communicated with the upper tank and the lower tank of the storage tank;
and a point location level sensor 16 connected to the top of the tank.
The upper box front end pressure measuring device 7, the upper box rear end pressure measuring device 8, the lower box front end pressure measuring device 9 and the lower box rear end pressure measuring device 10 are all pressure measuring sensors;
the upper tank air exhausting/supplementing device 3 and the lower tank air exhausting/supplementing device 4 are air exhausting/supplementing valves.
A method for carrying out pressure-bearing deformation test by using the pressure-bearing test equipment of the thin-wall double-cavity common-bottom structure storage tank comprises the following steps,
1) turning the storage tank from a horizontal state to a vertical state, placing the storage tank on a test base, and connecting related pipelines and devices (including a measuring sensor, an air exhausting and supplementing device, an emergency discharging device and the like);
2) in order to avoid the influence of the pressure difference between the upper tank and the lower tank on the common bottom, the sequence of firstly discharging the lower tank and then discharging the upper tank is adopted for filling; the top of the lower box is of a common-bottom closed structure, so that gas in the lower box cannot be directly discharged, the lower box is filled by adopting a flange filling mode from the rear bottom end, when the lower box is filled, the gas in the lower box is discharged through the lower box gas exhausting/supplementing device 4, after the lower box is filled, the lower box gas exhausting/supplementing device 4 is sealed, then the lower box is pressurized, and the pressure is applied to balance the dead weight pressure of the water column of the upper box; when the upper box is filled, the gas in the upper box is exhausted through the upper box exhaust/gas supplementing device 3;
the method specifically comprises the following operations:
a) closing the upper tank leakage control valve 1, opening the lower tank leakage control valve 2 to communicate the lower tank with the filling pipeline 15, and opening the lower tank exhaust/air supplement device 4 to communicate the lower tank with the external atmosphere environment;
b) confirming a lower tank filling starting point through the lower tank filling and changing liquid level device 6, and starting to cumulatively calculate the mass of the medium flowing into the lower tank;
c) in the filling process, gas in the lower box is discharged through the lower box gas discharging/supplementing device 4, the pressure measuring device 9 at the front end of the lower box and the pressure measuring device 10 at the rear end of the lower box are monitored, the pressure is strictly forbidden to exceed 1/2 of the pressure-bearing test pressure of a product, the overpressure of the product is avoided, and if the pressure is increased, the filling flow needs to be adjusted;
d) when water flows out from the lower tank exhaust/air supplement device 4, stopping filling the lower tank, closing the lower tank filling and discharging control valve 2, and recording the lower tank filling accumulated mass m 2; when the lower box exhaust/air supplement device 4 does not flow water any more, closing the lower box exhaust/air supplement device 4, recording the mass of the medium accumulated and discharged by Q2, and subtracting m2 to obtain the mass of the medium in the lower box;
e) the lower tank is pressurized in a pressure water squeezing mode, the pressurizing pressure is based on the pressure capable of offsetting the self weight of the water column of the upper tank, and the common bottom 14 is prevented from bearing negative pressure;
f) opening the upper tank charging and discharging control valve 1 to communicate the upper tank with the charging pipeline 15, and opening the upper tank exhaust/gas supplementing device 3 to communicate the upper tank with the external atmospheric environment;
g) confirming an upper tank filling starting point through an upper tank filling and changing liquid level device 5, and starting to cumulatively calculate the mass of a medium flowing into the upper tank;
h) in the filling process, gas in the tank is discharged through the upper tank gas discharging/supplementing device 3, the pressure measuring device 7 at the front end of the upper tank and the pressure measuring device 8 at the rear end of the upper tank are monitored, the pressure is strictly forbidden to exceed 1/2 of the pressure-bearing test pressure of a product, the overpressure of the product is avoided, and if the pressure is increased, the filling flow needs to be adjusted;
i) in the process of filling the upper box, attention needs to be paid to monitoring a lower box front end pressure measuring device 9 and a lower box rear end pressure measuring device 10, and the lower box is close to the pressure-bearing test pressure, pressure is relieved through a lower box exhaust/gas supplementing device 4, so that the lower box is prevented from being over-pressurized due to the liquid column pressure of the upper box;
j) when the upper tank liquid is filled to the top end of the storage tank, triggering the point position liquid level sensor 16, closing the upper tank filling and discharging control valve 1 and the upper tank air exhausting/supplementing device 3 after the upper tank stops filling, and recording the upper tank filling accumulated mass m 1; if the box is not filled, the medium is added through the measuring cup, the adding amount is recorded, and the adding amount is added with m1 to obtain the medium quality in the upper box.
3) After filling, the upper tank and the lower tank are alternately coordinated to pressurize, the pressure of the upper tank is not higher than that of the lower tank at any time, and the pressure difference between the upper side and the lower side of the common bottom is not higher than the single bottom examination pressure; pressurizing to a target examination pressure, maintaining the pressure, and then carrying out visual inspection on the welding line and the interface position of the box body;
the specific operation comprises the following operations:
a) pressurizing the lower box in a pressure water squeezing mode, checking interfaces such as a plugging cover, a pipeline, a valve, a sensor, an instrument and the like connected with the lower box after pressurizing to the inspection pressure (generally 0.2Mpa), and continuously pressurizing after confirming that no leakage exists;
b) in the process of pressurizing the lower box, attention needs to be paid to monitoring a pressure measuring device 7 at the front end of the upper box and a pressure measuring device 8 at the rear end of the upper box, if the upper box is close to the pressure-bearing test pressure, the upper box is decompressed through an upper box exhaust/gas supplementing device 3, and the overpressure of the upper box caused by the deformation of the pressurized common bottom 14 of the lower box is prevented;
c) pressurizing to a lower box target examination pressure, maintaining the pressure, and then carrying out visual inspection on the welding line and the interface position of the lower box to detect whether the problems exist (whether cracks exist, leakage and the like);
d) pressurizing the upper box in a pressure water squeezing mode, checking interfaces such as a plugging cover, a pipeline, a valve, a sensor and an instrument which are connected with the upper box after pressurizing to the inspection pressure (generally 0.2MPa), and continuously pressurizing after confirming that no leakage exists;
e) the front end pressure measuring device 9 and the rear end pressure measuring device 10 of the lower box need to be monitored in the pressurizing process of the upper box, when the lower box exceeds the range of pressure-bearing test pressure +/-0.005 MPa, the lower box air exhausting/supplementing device 4 is used for relieving pressure, the upper box is pressurized after the pressure is relieved to the lower limit of the range of the test pressure +/-0.005 MPa, and the steps are repeated until the upper box is pressurized to the target examination pressure;
f) and (4) pressurizing to the upper box target examination pressure, maintaining the pressure, and then carrying out visual inspection on the welding line and the interface position of the upper box to determine whether the problems exist (whether cracks exist, leakage and the like).
4) After pressurization is finished, the upper box and the lower box are alternately coordinated to release pressure, the pressure of the upper box is not higher than that of the lower box at any time, and the pressure difference between the upper side and the lower side of the common bottom is not higher than the single bottom examination pressure;
the method specifically comprises the following operations:
a) slowly opening the upper tank leakage control valve 1, releasing pressure of the upper tank in a way of slowly returning water through a filling pipeline 15, opening an upper tank exhaust/gas supplement device 3 when the pressure of the front end of the upper tank is released to be close to 0, communicating the interior of the upper tank with the external atmosphere, completing the pressure release of the upper tank, and closing the upper tank leakage control valve 1;
b) slowly opening the lower tank leakage control valve 2, releasing pressure of the lower tank in a way of slowly returning water through the filling pipeline 15, stopping releasing pressure after the pressure at the front end of the lower tank is close to the initial protection pressure, and closing the lower tank leakage control valve 2;
5) after pressure relief is finished, the upper box and the lower box are alternately coordinated to recover a test medium, and air needs to be supplied into the boxes in real time in the process of pressure relief, so that negative pressure is prevented from being generated in the boxes;
the method specifically comprises the following operations:
a) opening the upper tank leakage control valve 1, recovering the test medium in the upper tank by adopting a water pump pumping mode, and closing the upper tank leakage control valve 1 after recovery is finished;
b) opening the lower box exhaust/gas supplementing device 4, and relieving residual pressure in the lower box to enable the lower box exhaust/gas supplementing device 4 to be in a normally open state;
c) and opening the lower box leakage control valve 2, recovering the test medium in the lower box by adopting a water pump pumping-back mode, supplementing air into the box through the lower box exhaust/air supplement device 4 in the recovery process, and closing the lower box leakage control valve 2 after recovery is finished.
6) And (3) removing related pipelines and devices, drying residual test media in the tank, and after drying is completed, carrying out visual inspection on all welding lines on the inner surface and the outer surface of the storage tank to confirm that the weld lines are flawless.
In the filling process of the storage tank pressure-bearing test, the measurement of the volume of the storage tank is realized at the same time.
Taking a certain type of common-bottom storage tank with the diameter of 5m as an example, hydraulic test and volume measurement are carried out by the test equipment and the method, the volumes of the upper tank and the lower tank are precisely calibrated in a gradient filling mode of 20t/h (initial) to 200t/h (large flow) to 50t/h (termination), and the filling time of the upper tank and the lower tank is about 1 h; then, a hydraulic strength examination test is carried out, the final examination test pressure of the lower box is 0.6MPa, the final examination test pressure of the upper box is 0.3MPa, and the examination task is fully completed.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides a thin wall two-chamber is total to end structure storage tank pressure-bearing test is equipped which characterized in that: comprises a pressure measuring device and a filling pipeline (15);
the pressure measuring device comprises an upper box front end pressure measuring device (7) for measuring the highest point pressure of an upper box of the storage box, an upper box rear end pressure measuring device (8) for measuring the lowest point pressure of the upper box of the storage box, a lower box front end pressure measuring device (9) for measuring the highest point pressure of a lower box of the storage box, and a lower box rear end pressure measuring device (10) for measuring the lowest point pressure of the lower box of the storage box;
the filling pipeline (15) is divided into two paths, one path is communicated with a filling port of an upper tank of the storage tank, and an upper tank filling and discharging control valve (1) is arranged on a pipeline of the path; the other path is communicated with a filling port of a lower tank of the storage tank, and a pipeline of the path is provided with a lower tank filling and discharging control valve (2);
the device also comprises an upper box exhaust/air supplement device (3) connected with the top end of the upper box of the storage box and a lower box exhaust/air supplement device (4) communicated with the lower box of the storage box.
2. The thin-wall double-cavity common-bottom structure storage tank pressure-bearing test equipment of claim 1 is characterized in that: the filling port of the upper tank is positioned at the bottom end of the side surface of the upper tank of the storage tank, and the upper tank air exhausting/supplementing device (3) is positioned at the top of the upper tank of the storage tank; the filling port of the lower tank is positioned at the lower end of the lower tank of the storage tank.
3. The thin-wall double-cavity common-bottom structure storage tank pressure-bearing test equipment of claim 1 is characterized in that: the upper box front end pressure measuring device (7) is arranged at the top end of the upper box of the storage box, and the upper box rear end pressure measuring device (8) is arranged at the bottom end of the upper box of the storage box; the lower box rear end pressure measuring device (10) is arranged at the bottom end of the lower box of the storage box.
4. The thin-wall double-cavity common-bottom structure storage tank pressure-bearing test equipment of claim 1 is characterized in that: further comprising an exhaust/air supplement pipe (13) extendable to the top end of the lower tank of the storage tank; the lower box front end pressure measuring device (9) and the lower box exhaust/air supplement device (4) are arranged on an exhaust/air supplement pipe (13).
5. The thin-wall double-cavity common-bottom structure storage tank pressure-bearing test equipment of claim 4 is characterized in that: the device also comprises an upper tank emergency discharge device (11) and a lower tank emergency discharge device (12) which are connected with the top end of the storage tank; the lower box emergency discharge device (12) is connected with an exhaust/air supplement pipe (13).
6. The thin-wall double-cavity common-bottom structure storage tank pressure-bearing test equipment of claim 1 is characterized in that: an upper tank filling and changing liquid level device (5) and a lower tank filling and changing liquid level device (6) are respectively arranged on pipelines of the filling pipeline (15) communicated with the upper tank and the lower tank of the storage tank.
7. The thin-wall double-cavity common-bottom structure storage tank pressure-bearing test equipment of claim 1 is characterized in that: and the device also comprises a point location liquid level sensor (16) connected with the top end of the storage tank.
8. The thin-wall double-cavity common-bottom structure storage tank pressure-bearing test equipment of claim 1 is characterized in that: the upper box front end pressure measuring device (7), the upper box rear end pressure measuring device (8), the lower box front end pressure measuring device (9) and the lower box rear end pressure measuring device (10) are all pressure measuring sensors.
9. The thin-wall double-cavity common-bottom structure storage tank pressure-bearing test equipment of claim 1 is characterized in that: the upper box exhaust/air supplement device (3) and the lower box exhaust/air supplement device (4) are exhaust/air supplement valves.
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| CN114252344A (en) * | 2021-12-20 | 2022-03-29 | 北京星际荣耀空间科技股份有限公司 | Low-temperature hydraulic testing device and method for pressure container without heat insulation layer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114252344A (en) * | 2021-12-20 | 2022-03-29 | 北京星际荣耀空间科技股份有限公司 | Low-temperature hydraulic testing device and method for pressure container without heat insulation layer |
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