235 results about "Hydrostatic test" patented technology

The invention relates to the technical field of hydraulic test of nickel alloy pipes, and discloses a hydraulic test system for a thin-wall nickel alloy pipe. According to the system, in the axial loading state of the thin-wall nickel alloy pipe, a closed water pressure cavity is established through an annular sealing clamp, and then strain distribution data on the surface of the pipe body is collected through a distributed optical fiber sensor array. And constructing a three-dimensional stress field reconstruction model based on the acquired strain distribution data, calculating an equivalent plastic deformation threshold value of the pipe body under different water pressure gradients, adjusting a water pressure loading curve slope parameter according to the equivalent plastic deformation threshold value, and generating a dynamic water pressure loading instruction. And the high-frequency pressure pulse generator executes the instruction, synchronously triggers the X-ray diffractometer to collect lattice distortion data of the tube body, inputs the data into the material microscopic damage evolution model, and outputs a microscopic defect spatial distribution map. And finally, material constitutive parameters of the three-dimensional stress field reconstruction model are corrected based on the atlas, closed-loop feedback control is formed, and multi-dimensional data acquisition and accurate management and control of the thin-wall nickel alloy pipe hydrostatic test are achieved.

The invention relates to the technical field of nickel alloy pipe water pressure detection, and discloses a thin-wall nickel alloy pipe inner wall water pressure test detection system and method. The method comprises the steps that a closed water pressure environment is established in a pipe, a preset pressure gradient is applied, and pipe wall deformation response data are collected through a distributed sensing array; and generating a composite feature matrix containing axial strain, circumferential stress and radial displacement features through multi-dimensional feature extraction, inputting the composite feature matrix into a material performance degradation evaluation model, and simulating microstructure change to output a potential defect distribution map. Dynamically adjusting the water pressure gradient and the pressure maintaining time according to the map, executing a secondary water pressure test, and capturing a microscopic deformation sequence image through high-frequency imaging; comparing the image with a model prediction result identification deviation value, and iteratively updating a model parameter to optimize a detection threshold value; the test is completed by optimizing the threshold value, qualified pipe section marks and defective pipe section positioning coordinates are output, and the comprehensiveness and accuracy of thin-wall nickel alloy pipe inner wall defect detection are improved.

The invention belongs to the technical field of testing, and particularly relates to a high-pound-level thin-wall part flange-free water pressure test anti-deformation device which comprises a workbench, a positioning assembly, a pressurizing assembly and a rotating assembly, the positioning assembly is arranged above the workbench and comprises a supporting circular plate, a hollow cylinder is fixed to the bottom of the supporting circular plate, and the rotating assembly is arranged on the supporting circular plate. The hollow cylinder is rotatably matched with the working table, a plurality of positioning bosses for positioning a test piece are arranged on the upper surface of the supporting circular plate, the pressurizing assembly is used for increasing water pressure for the test piece and comprises a plurality of plugging blocks arranged above the working table, and the plugging blocks coaxially correspond to the positioning bosses respectively. According to the invention, a traditional direct clamping and fixing mode is abandoned, so that the possibility that the test pieces are extruded and deformed by external force when being fixed is avoided, in addition, a plurality of test pieces are tested at the same time, the working continuity is high, the time required by the test is effectively shortened, and the test efficiency is improved.

The invention relates to the technical field of blind plate detection, and aims to provide a hydraulic test method for detecting a pressure-bearing sealing blind plate of a pump shell, which comprises the following steps: mounting a blind plate to be tested, performing a first pressure boosting test, performing a first pressure relief test, performing a second pressure boosting test and performing a second pressure relief test, multiple times of pressure relief and pressure maintaining are carried out in the first pressure relief test and the second pressure relief test, and whether leakage points and deformation points exist or not is observed; through two times of boosting tests of different water temperatures, complex working conditions during operation of the main pump can be simulated, so that test results are more accurate.

The invention provides an intelligent adjusting method and system for a steel pipe hydrostatic pressure valve, and relates to the technical field of equipment control, and the method comprises the steps: obtaining the specification parameters of a to-be-tested steel pipe; the volume of the steel pipe is calculated according to the specification parameters, adjusting parameters are dynamically determined according to the volume and the wall thickness of the steel pipe, meanwhile, a target pressure value is set according to a preset pressure curve, and in the hydrostatic pressure testing process, pressure signals and flow signals in the steel pipe are collected in real time; comparing the pressure signal with a set target pressure value to obtain a pressure deviation, and integrating the pressure signal and the flow signal which are acquired in real time into a group of multidimensional discrete data sequences according to a sequential relationship. According to the invention, accurate, stable and automatic closed-loop control of the pressure in the hydrostatic pressure test process of the steel pipe is realized.

The invention relates to the technical field of hydropower station pressure steel pipe detection, in particular to a hydropower station steel branch pipe differential graded loading and unloading hydrostatic test method, system and equipment and a storage medium. The hydraulic test process is scientifically divided into a low-pressure stage, a medium-pressure stage and a high-pressure stage, differentiated boosting amplitude and speed control strategies are adopted in the different stages, the technical limitation of a traditional uniform graded boosting method is broken through, and an innovative control mode of low-pressure fast rising and high-pressure slow rising is achieved. The large boosting amplitude and the high boosting speed are adopted in the low-pressure stage, the bearing allowance of the steel branch pipe in the elastic deformation stage is fully utilized, and the test efficiency is remarkably improved; and in the high-pressure stage, the small pressure increasing amplitude and the slow pressure increasing speed are adopted, the sensitive characteristic when the steel is close to the yield strength is effectively adapted, and the local stress concentration and plastic deformation risks are avoided.

The invention provides a nuclear power generator compactness test method. The nuclear power generator compactness test method comprises the following steps: S1, cleaning; and the to-be-detected product is comprehensively cleaned. S2, preparation before measurement; and the end socket and the cover plate are assembled to ensure that the product forms a sealed cavity. And S3, carrying out an airtight test. And S4, preliminary inspection. And S5, carrying out a hydrostatic test. And S6, performing secondary inspection. And S7, reducing the pressure. And S8, dismounting the end socket and the cover plate, and completing the detection. By combining the airtight test and the hydrostatic test, the compactness of the nuclear power generator can be comprehensively detected, a detection blind area possibly existing in a single test method is effectively avoided, a special pressure boosting and reducing mode is adopted for hydraulic pressure detection, the accuracy and reliability of a test result are guaranteed, welding residual stress can be effectively eliminated, and the reliability of the nuclear power generator is improved. And the sealing performance and the structural stability of a nuclear power generator product are obviously improved.

The invention relates to a rapid sealing method for a deep sea equipment hydrostatic test measuring wire joint, and the method comprises the following steps: 1, selecting a sealing region, and sealing the sealing region; the sealing area comprises a metal section formed after the external metal core is connected and further comprises an outer skin head section adjacent to the external metal core, the length of the metal section is L1, and the length of the outer skin head section is L2; step 2, cleaning the surface of the sealing area; step 3, cutting out a rubber-based pressure-sensitive adhesive tape with a proper length, and wrapping the rubber-based pressure-sensitive adhesive tape outside the sealing area; and 4, the rubber-based pressure-sensitive adhesive tape is tightly attached to the outer surface of the sealing area in an extrusion mode, so that the sealing operation of the wire connector can be conducted on an operation site, the method is simple, the cost is low, and the good sealing performance is achieved.

A hydrostatic test device for an inclined swirler of a heavy duty gas turbine comprises an annular base for containing the inclined swirler, two parallel sealing ring grooves are formed in the inner conical surface of the base, and rubber sealing rings matched with the sealing ring grooves are arranged in the sealing ring grooves. The two parallel sealing ring grooves and the rubber sealing ring enable the upper portion and the lower portion of a blade hole in the side face of the inclined cyclone to be tightly attached, the effect of sealing the blade hole can be achieved in the hydrostatic test, the device further comprises three to six pressing plates which are evenly distributed on the surface of a circle of the inclined cyclone, and the pressing plates press the inclined cyclone through bolts and locking nuts. A copper plate is arranged between the pressing plate and the end face of the inclined cyclone.

The invention discloses a prestressed concrete cylinder pipe water hammer real-time distinguishing and positioning system for hydraulic monitoring and a mounting and using method, the system comprises a plurality of sensors located on a concrete cylinder pipe, the concrete cylinder pipe is also provided with a flow velocity meter, and the flow velocity meter and the sensors are both connected with an acquisition device. The high-frequency pressure pulsation sensors and the flow meters are reasonably arranged in the PCCP, high-frequency change data of the water pressure and the flow speed in the PCCP can be obtained in real time, compared with a traditional water pressure test or static monitoring method, the dynamic fluctuation process of the water pressure and the flow speed can be captured, the hydraulic boundary condition change in pipeline operation can be comprehensively reflected, and the method is suitable for popularization and application. And data support is provided for hydraulic analysis and safety evaluation.

The invention provides a pump valve shaft seal water hydraulic pressure test detection device which comprises a box body, a partition plate is fixed in the box body, an opening is formed in the partition plate, a movable plate is movably installed in the opening, a displacement mechanism and a positioning column are fixed to the movable plate, a positioning pipe is movably installed at one end of the positioning column, and the other end of the positioning pipe is provided with a clamping groove. The positioning pipe and the displacement mechanism are both fixed to the side of the box body, a pushing mechanism is fixedly installed on the side of the box body, fixing assemblies are installed on the pushing mechanism, a valve body is movably installed between the fixing assemblies, a cavity is formed in the box body, and the valve body is movably installed in the cavity. During use, before the pump body is installed, the ring seat drives the fixed pipe to move, the fixed pipe provides a required space for installation of the valve body after moving, the ring seat and the fixed pipe enter one end of the valve body in the later period, the valve body is limited and supported through the fixed pipe, and the movable seat moves in the later period to extrude and fix the valve body between the fixed seats; and air enters the fixed pipe at the later stage, and the elastic seat deforms to be in contact with the valve body for sealing during air intake.

The invention discloses a pressure steel pipe bifurcated pipe hydraulic pressure test monitoring system and method, and relates to the technical field of bifurcated pipe hydraulic pressure monitoring, and the steel bifurcated pipe hydraulic pressure monitoring system comprises a stress measurement module, a pressure measurement module, a data monitoring platform, and a water pump automatic pressurization control module. The stress measurement module is used for measuring the stress of the steel bifurcated pipe according to the stress characteristics of the Y-shaped symmetrical internally-reinforced steel bifurcated pipe, wherein the stress measurement areas of the steel bifurcated pipe are an obtuse angle area, a crescent rib side pipe wall and a crescent rib plate; the pressure measuring module is provided with four steel pipes on the steel branch pipe, and the four steel pipes are communicated to the interior of the steel branch pipe and are respectively a water injection pipe, a water drainage pipe, an exhaust pipe and a pressurizing pipe. Through a hydraulic test, welding residual stress can be redistributed, tip stress and construction additional deformation of the steel bifurcated pipe are eliminated, local peak clipping stress elimination of the steel bifurcated pipe is achieved, and therefore the overall brittle failure resistance and stress corrosion resistance of the steel bifurcated pipe are improved, and safe and stable operation of the steel bifurcated pipe is guaranteed.

The application relates to a construction method of an inner water pressure device of an ultra-large-caliber reinforced concrete pipe jacking pipe section, which comprises the following steps: S00, hoisting a bottom blocking plate; S10, installing a pipeline and a positioning sleeve ring; S20, installing a top blocking plate; S30, performing an inner water pressure test on a single pipe section; S40, installing a pipe section splicing support and hoisting a lower pipe section; S50, installing a pipe section interface splicing device and splicing an upper and lower pipe jacking pipe section; S60, assembling a hoisting type pipe jacking interface inner water pressure test device; S70, installing the hoisting type pipe jacking interface inner water pressure test device; S80, performing an inner water pressure test on a pipe section interface; and S90, installing a pipe jacking interface opening angle positioning device. The application has the advantages that a pipe jacking pipe section interface splicing device and a pipe jacking inner water pressure counter-pulling adjustment test frame are adopted, the structure design is ingenious, assembly is convenient, the positioning sleeve ring can be used for adjusting the perpendicularity of the pipe section, the sealing property of the structure can be maintained, the leakage phenomenon is reduced, the reliability of detection data is improved, and remarkable economic benefits are achieved.

The utility model discloses an auxiliary device for a pipeline hydrostatic test in the field of hydrostatic tests, which comprises a mounting ring, a mounting component connected to one side of the mounting ring, a telescopic rod connected to one side of the mounting ring far away from the mounting component, an electric telescopic rod connected to one side of the mounting ring far away from the mounting component, and a butt joint ring connected to the telescopic end of the telescopic rod. According to the pipeline water pressure detection device, the pipeline butt joint efficiency and stability in the pipeline water pressure detection process can be effectively improved through the pipeline water pressure detection device, the pipeline water pressure detection efficiency is improved, and the pipeline water pressure detection accuracy is improved. By means of the adjusting structure of the device, the device can conduct compatible limiting on pipelines with different diameters.

The utility model relates to an explosion-proof motor shell hydraulic pressure test device, and belongs to the technical field of explosion-proof motor production, the explosion-proof motor shell hydraulic pressure test device comprises a base, an upper sealing gasket, a lower sealing gasket and a hydraulic mechanism arranged on the base, the surface of the upper sealing gasket is provided with a water inlet hole, the output end of the hydraulic mechanism is fixedly provided with a pressing block, and the pressing block is provided with a water inlet pipe; the water inlet pipe is communicated with the water inlet hole and externally connected with a pressure system, the surface of the base is concavely provided with a water storage tank, the water storage tank is externally connected with a drainage pipe, sliding rails are symmetrically fixed to the base, supporting tables are symmetrically and slidably connected to the sliding rails, and lower sealing gaskets are arranged on the surfaces of the supporting tables. According to the device, two supporting tables are arranged, when one supporting table moves to the bottom of the hydraulic mechanism for testing, the other supporting table can conduct feeding and discharging actions of a motor shell, the two supporting tables conduct testing alternately, feeding and discharging can be conducted on the other supporting table in the testing process of one motor shell, and therefore uninterrupted testing is achieved; and the test efficiency is improved.

The invention discloses a water pressure test device, which comprises a detection pipe, a water pressure test device and a water pressure test device, the exhaust valve is arranged on the outer side wall of the detection pipe and is communicated with the water pressure chamber; the blocking plate is hermetically and fixedly connected with one end of the detection tube; the water inlet valve is arranged on the blocking plate, communicates with the interior of the water pressure cavity and is used for injecting water into the water pressure cavity; the flange is hermetically and fixedly connected with the other end of the detection pipe; a mounting opening is formed in the flange; one end of the to-be-tested piece is arranged in the water pressure chamber through the mounting port; and the pressing plate is in sealing connection with the flange to seal and fix the other end of the to-be-tested piece. According to the invention, the accuracy, reliability and efficiency of the instrument casing water pressure test are improved.

The utility model is suitable for the technical field of hydrostatic tests, and provides a sealing structure for a hydrostatic test in a reinforced concrete pipeline, which comprises a steel cylinder arranged in a pipeline body, the steel ring is mounted at one end of the steel cylinder; the rubber tire is arranged in the groove of the steel ring and used for sealing the contact point of the steel ring and the pipeline body, the rubber tire is in contact with one side of the groove, the hard square rubber strip is arranged on the rubber tire in a sleeving mode, and the water swelling sealing rubber strip is arranged in the groove of the steel ring and used for sealing the contact point of the steel ring and the pipeline body. The water swelling sealing rubber strip is arranged on the hard square rubber strip in a sleeving manner; and the positioning mechanism is arranged on the steel cylinder and is used for positioning the steel cylinder. According to the water pressure test sealing structure in the reinforced concrete pipeline, the common tire inner container, the hard square rubber strip and the hollow water swelling sealing rubber strip which can be easily purchased from the market are arranged, and special customization is not needed, so that the cost is reduced, and the water pressure test sealing structure better meets the market requirement.

The utility model discloses a hydraulic test device for a chemical pipeline, which comprises a base and a protective box, the protective box is arranged at the top of the base, a supporting plate is arranged at the upper part in the protective box, a gear shaft is arranged between the inner walls, close to one side of the front surface, above the supporting plate in the protective box through a bearing seat, and gears are arranged at positions, corresponding to tooth mark strips, on the gear shaft; first telescopic rods are arranged on the tops, close to the front face, of the supporting plates on the inner sides of the gears, the output ends of the first telescopic rods penetrate through the supporting plates to be fixedly connected with pipe covers, arc-shaped clamping blocks are arranged on the two sides in the pipe covers, and springs are evenly arranged on the tops and the bottoms of the outer sides of the clamping blocks to be connected with the inner walls of the pipe covers. According to the utility model, by protecting the connecting pipe, the connecting pipe can be prevented from being damaged, and before a test, the clamping block can be used for clamping and limiting the connecting part, so that the connecting part can be prevented from deviating during the test, and the test result can be prevented from being influenced.

The utility model provides a multifunctional test tool for a cold air pushing and punching device. The tool comprises a tool frame body, a pushing and punching device fixing structure, a pressure test structure, an inner cylinder protection plate, a thrust selection test structure, a pipeline assembly and a pressure sensor. The pushing and punching device fixing structure, the pressure test structure, the inner cylinder protection plate and the thrust selection test structure are all mounted on the tool frame body; the cold air pushing and punching device is fixedly mounted on the pushing and punching device fixing structure; the pipeline assembly is connected with the cold air pushing and punching device. The pressure sensor is connected with the pipeline assembly; the pipeline assembly is connected with the stamping ground pipeline, the water pressure test bench and / or the air pressure test bench. The device is simple in structure and convenient to install and operate, various types of tests on the cold air pushing and punching device can be achieved, and the test efficiency and the test multifunctionality of the cold air pushing and punching device are improved.

The utility model relates to the technical field of water pressure test devices, and discloses a water pressure test device which comprises a base, the top end of the base is fixedly connected with air cylinders arranged at equal intervals, the output end of each air cylinder is fixedly connected with a left supporting plate, and the right side face of each left supporting plate is fixedly connected with a left elliptical head. The top end of the base is fixedly connected with supporting bases arranged at equal intervals. According to the water pressure test device, the plurality of cylinders corresponding to the workpieces are arranged, so that the workpieces with different lengths can be conveniently positioned, the water pressure test operation of the workpieces with different lengths can be completed, and the water outlet and the right elliptical sealing head capable of sealing the water outlet are arranged, and the spring is arranged on the right side surface of the right supporting plate; the water outlet can be automatically opened and closed under the pushing of the workpiece, so that the water pressure test operation can be conveniently carried out on the workpieces with different numbers, and the problems that the existing water pressure test device is inconvenient to carry out test operation on the workpieces with different lengths and different numbers, and the practicability is low are solved.

The utility model discloses an open-end water pressure test device for watertight cable detection, which comprises a pressure source, a sealing test cavity, a control system and a data acquisition module, and is characterized in that a recovery disc at the top of the sealing cavity can collect water brought out in the exhaust process and guide the water into a water tank for cyclic utilization, so that water resource consumption is reduced; the filtering assembly continuously purifies a circulating medium, the pollution risk to the environment is reduced, the environment-friendly manufacturing concept is met, the whole device adopts modular design, all functional assemblies are reasonable in layout, and the occupied area is small; the control system is integrated on a PLC or a microprocessor, the operation interface is simple, the functions of one-key starting, automatic pressure maintaining, pressure relief and the like are supported, and the labor intensity of operators is remarkably reduced.

The utility model belongs to the technical field of photovoltaic modules, and discloses a photovoltaic module probe static pressure test device, which comprises a test platform and a photovoltaic module, the photovoltaic module is arranged on the upper surface of the test platform, and positioning grooves are arranged on the left side and the right side of the test platform. Driving mechanisms for performing comprehensive static pressure experiments on the upper surface of the photovoltaic module are slidably connected into the two groups of positioning grooves, clamping grooves are formed in the upper surface of the test platform, positioning mechanisms for limiting the position of the photovoltaic module at the upper end of the test platform are installed in the clamping grooves of the test platform, and storage mechanisms are arranged on the upper surfaces of the driving mechanisms; a reset mechanism is arranged on the outer surface of the driving mechanism, and the driving mechanism is started to drive the detection end of the driving mechanism to move up and down, back and forth and left and right, so that the driving mechanism replaces a belt driving mechanism to comprehensively move at the upper end of the photovoltaic module, and the stability of the subsequent driving mechanism in the using and moving process is improved.

The utility model provides hydraulic test equipment for a diesel engine cylinder sleeve, and belongs to the field of test equipment. Comprising a support frame, a top plate and a bottom plate, the supporting sleeve is arranged in the mounting through groove and detachably connected with the mounting through groove, and a first sealing ring is mounted on the inner side of the supporting sleeve and used for mounting the air cylinder sleeve in a matched mode; the test sleeve is integrally connected to the bottom side of the top plate, a water inlet pipe and a water outlet pipe are mounted on the top side, an annular stop block is mounted on the inner side of the test sleeve, and a second sealing ring is mounted on the inner side of the annular stop block; the pressing plate is arranged on the top side of the top plate, fixedly connected with the top plate through a pressing bolt and used for fixing the air cylinder sleeve. The diesel engine cylinder sleeve is supported on the supporting sleeve for a hydrostatic test, whether the cylinder sleeve leaks water or not can be judged only by filling the test sleeve and the diesel engine cylinder with water and observing the reading change of the shock-proof pressure gauge during the test, meanwhile, the supporting sleeve and the annular stop block can be replaced, the cylinder sleeves of different sizes can be tested, and the applicability of the device is improved.

The utility model relates to the field of medium mixing, concretely relates to a simple tank hetero -media mixing device, in order to solve the rust of carbon steel material under the condition of existing condition and production cycle requirement after water pressure test, cause the problem of local area because manual unreachable cleaning, the shell top of this scheme is open, the shell bottom connects the bottom plate, left inlet pipe and right inlet pipe communicate with shell inner space, rotate operating lever B for controlling gland B switch above mixed medium discharge gate, the longitudinal narrow section of corrosion inhibitor bin is U type, the left and right ends of corrosion inhibitor bin are fixedly connected with the upper portion of shell inner wall, the left and right end side walls of corrosion inhibitor bin are coplanar with shell inner wall, corrosion inhibitor bin divides shell inner space, corrosion inhibitor bin is A cavity, the rest space is B cavity, rotate operating lever A for controlling gland A switch above discharge gate, this scheme makes corrosion inhibitor and test water mix fully and distribute evenly in water body.

The utility model discloses a pressure stabilizing pipeline for a water pressure test of an air storage tank, and relates to the technical field of pressure containers. The input end of the first stop valve is connected to the output end of the pressure test pump, and the output end is connected to the input end of the first pipeline; the output end of the first pipeline is connected to the input end of the surge tank assembly; the output end of the surge tank assembly is connected to the input end of the second pipeline; the output end of the second pipeline is connected to the input end of the second stop valve; the output end of the second stop valve is connected to the water injection port of the air storage tank; the piezometric tube is of a bent buffer structure, one end of the piezometric tube is fixedly connected to the top of the surge tank assembly, and the other end of the piezometric tube is detachably connected to the pressure gauge. Therefore, the pressure change generated by the pressure test pump can be effectively buffered, and the test pressure is always maintained in the preset range, so that the risks of equipment damage and process failure possibly caused by pressure fluctuation are reduced.

The invention provides a sealing device for a water pressure testing machine for an external measurement method of a fire extinguisher bottle, comprising a body, an auxiliary component for extension being arranged inside the body, the auxiliary component comprising a sleeve, an extension column and an auxiliary strip, the sleeve being provided with an extension column, the surface of the extension column being provided with an auxiliary strip, the screw is rotated through the extension column to push the auxiliary sleeve into the interior of the bottle body, during this process, the screw pushes the auxiliary strip while passing through the internal thread of the extension column, the elasticity of the auxiliary strip makes the screw enter the extension column and then interfere with the extension column, and pushes the arched side of the auxiliary strip to expand outward, the outer side of the auxiliary strip is expanded outward and then fits with the inner side of the bottle mouth of the bottle body through the through hole on the outer side of the extension column, the auxiliary strip is clamped to the bottle body by the extrusion of the screw, thereby improving the stability during the test.

The present application relates to a kind of hydraulic system three-dimensional depth double linkage reliability optimization method of thermal power generating unit, comprising the following steps: accounting top shaft oil pressure;Select appropriate position as the introduction point, prefabricate bilateral top shaft oil connecting device to realize system three-dimensional depth extension;Water pressure test is carried out to connecting device to ensure the tightness of shutdown mechanism;Connecting device is purged to ensure the cleanliness of oil system;When unilateral failure occurs, operate shutdown switching connecting device, ensure that top shaft oil hydraulic system is normally put into use.The present application ensures that A, B top shaft oil system is mutual standby through the low-cost reasonable modification of oil supply system, once unilateral failure occurs, it can be ensured that top shaft oil hydraulic system is normally put into use by operating shutdown switching device, and maintenance personnel can have sufficient time to overhaul the fault oil pump and other equipment.

The utility model relates to the technical field of steel pipe hydrostatic testing, in particular to a steel pipe hydrostatic testing device which comprises a base, a first support arranged at the end of the base, a pressurizing pipe fixedly arranged on the first support, a connecting pipe connected to one end of the pressurizing pipe, a water inlet cavity arranged in the pressurizing pipe, and a water outlet cavity communicated with the connecting pipe. A sealing head is mounted at one end of the pressurizing pipe away from the connecting pipe; a sealing ring is sleeved outside the sealing head; a pressurizing mechanism is mounted on the pressurizing pipe; the sealing ring is arranged between the pressurizing mechanism and the sealing head; the pressurizing mechanism is matched with the sealing head to extrude the sealing ring; a first through hole is formed in the sealing head; the first through hole communicates with the water inlet cavity. The pressurizing mechanism and the sealing head are matched to extrude the sealing ring, friction between the sealing ring and the inner wall of the to-be-tested steel pipe is increased, axial deformation of the sealing ring is avoided, sealing performance is enhanced, and the sealing effect is improved.

The invention belongs to the field of nuclear power station safety systems, and particularly relates to a method for shortening hydrostatic test time of a medium-pressure safety injection tank during overhaul of a VVER unit, which comprises the following steps: step 1, transferring a boric acid solution to a medium-pressure safety injection tank which does not need to be overhauled by the medium-pressure safety injection tank which needs to be overhauled; 2, the medium-pressure safety injection tank needing to be overhauled transfers a boric acid solution to the emptied demineralized water tank; 3, the medium-pressure safety injection box needing to be overhauled transfers the boric acid solution to the boric acid solution collecting box; 4, the medium-pressure safety injection tank needing to be overhauled is overhauled according to the overhaul plan, and the overhauled medium-pressure safety injection tank is obtained after overhaul is completed; 5, filling the overhauled medium-pressure safety injection tank with a boric acid solution; step 6, preheating the overhauled medium-pressure safety injection tank and a pipeline valve thereof; and step 7, performing a hydraulic pressure test on the overhauled medium-pressure safety injection tank to complete the hydraulic pressure test on the overhauled medium-pressure safety injection tank. The method can effectively relieve the overhaul pressure of the medium-pressure safety injection system, shorten the overhaul period and save overhaul materials.

The present application relates to the technical field of pipeline hydrostatic test, and especially relates to a pressure water supplementing and metering device for municipal pipeline hydrostatic test, which comprises a water tank, a booster pump, a flowmeter and a control cabinet, a program controller is arranged in the control cabinet, further comprising a pressure sensor and a vibration sensor arranged along the axial direction of the pipeline to be tested, and an active tunable damper arranged between the pump outlet and the pipeline; the program controller synchronously collects pressure and vibration data, carries out correlation analysis on the data, generates a pressure wave space-time propagation graph, calculates a water hammer risk index and divides a risk level through a nonlinear fusion model according to the dominant frequency, amplitude, propagation speed change rate and vibration energy of the pressure wave, selects an inhibition strategy according to the risk level, calculates a pressure peak value reduction rate and a wave fluctuation decay time according to the data after inhibition, and generates an effect evaluation value. The present application realizes active sensing, graded inhibition and effect evaluation of water hammer risk, and improves the safety and intelligent level of the hydrostatic test.