RU2194965C2 - Stand for hydraulic tests of articles - Google Patents

Abstract

FIELD: test stands for hydraulic tests of articles; study of fuel filling procedure at airfields. SUBSTANCE: proposed stand includes service reservoir 1 and pumps 2 and 3 interconnected in parallel; these pumps are also connected to service reservoir 1. Pressure lines of pumps 2 and 3 are connected by means of pipe lines which are provided with valves 9-21 and branch pipes 21-25 for connecting the object under test; they also include control instruments, check valves 4 and 5 and relief valve 6. For study of situations which present fire hazard due to static electricity and hydrodynamic fluctuations of pressure, test stand is provided with electrically insulated reservoir 29 connected to line supplying the medium to electrically insulated reservoir 29 through shut-off unit 30 at preset time of shutting-off the flow. Reservoir 29 is connected with inlet branch pipe of service reservoir 1 through third insulating insert 31; outlet branch pipe 16 of reservoir 1 is connected to branch pipes 23, 24 and 25 by means of additional pipe line 22 through first check valve 4 for connecting the articles under test. Pressure line of one of pumps 3 is connected to additional pipe line 22 through second check valve 5 and relief valve 6 before first check valve. EFFECT: extended functional capabilities. 2 cl, 1 dwg

Description

 The invention relates to stands for hydraulic testing of products, mainly for testing devices for shock loads using liquid and gaseous substances or vacuum, and can be used to study the process of refueling equipment with fuel at airfields, for example, the electrification of fuel and sharp hydrodynamic pressure fluctuations (hydraulic shock) with a sharp shutoff of the flow, ground and aviation equipment.

 It is known from practice that the main area in which the generation of (charges) of opposite charges of static electricity occurs is the lines of auto-refueling vehicles (refueling units). Zones of accumulation and manifestations of static electricity are tankers of tankers and tanks (compartments) of refueling products / 1 - Methodology for certification of electrostatic intrinsic safety of tankers. M.: 25 State Research Institute of the Ministry of Defense of the Russian Federation, 1986. Approved by the commander of the military unit 25968 6. 11. 1986, p. 8/. Fire and explosion hazard situations from the accumulation of static electricity can occur during the creation of electrostatic loads: exceeding the surface potential of electrostatic charges (ESZ) of more than 54 kV in fuel in any of the tank compartments with a positive polarity of charges in the fuel and more than 25 kV with a negative polarity of charges in the fuel; exceeding the leakage current (swelling) of the ESE from the compartment (capacity) of more than 2.3 μA with a positive charge polarity and more than 1.15 μA with a negative charge polarity; an excess of the charge transferred in the discharge of more than 0.16 μC with a positive charge polarity and more than 0.04 μC with a negative charge polarity / 1 - ibid., p. 16-19 /.

 In the process of refueling aircraft with fuel and lower loading tankers with high volumetric velocities (more than 1000 l / min), pressure fluctuations (water hammer) occur when the flow is suddenly blocked, which can lead to a violation of the tightness of the fueling lines of the fuel systems of both aircraft and tankers (units) refueling), as well as the loss of operability of the elements of technological equipment, for example, meters or filters.

 The developers were faced with the task of creating a stand for hydraulic testing of products for researching the processes of open and closed refueling of ground and aviation equipment, draining and loading of tanks, analysis of fire hazard situations, hydrodynamic processes that occur when refueling objects to determine the maximum permissible refueling speeds.

 A well-known stand for hydraulic testing of units (parts) of technical means of fuel service / 2 - Guidelines for testing technical means of fuel service. Book 2. Methods for determining the technical and operational parameters of technical means of fuel service. M .: Military Publishing, 1989, p. 115 / containing a container with a product, shut-off valves, a piston pump, a pump for filling the test product with liquid, a safety valve, a pressure gauge, an air release valve, a test sample, and drain pipes.

 There is also a stand for determining hydraulic characteristics when testing filters and filter separators / 2 - in the same place, p. 401 /, containing a container with a product, a gate valve, an adjustable flow pump, a safety valve, a preliminary filter separator, an end valve for sampling a product, a liquid thermometer, a pressure gauge, a tested filter or filter separator, and a counter.

 The above stands for hydraulic testing of products have a limited list of the processes under study, namely, it is impossible to conduct research on refueling processes, electrification processes, hydrodynamic processes and their impact on refueling equipment (filters, meters, flexible hoses).

 The closest in technical essence to the proposed invention and taken as a prototype is a stand for hydraulic testing of products, containing a circulation circuit with a liquid tank, pump, valves, measuring instruments, with an additional circulation circuit connected to the tank and equipped with a stand-alone pump with a different operating characteristic moreover, both circuits are connected using bypass pipelines with shut-off and control valves to connect the tested products to them / 3 - Copyright certificate of the Soviet Union 731 336, F 28 F 27/00, 1978 - prototype /.

 The disadvantage of this stand is the limited list of the processes under study, namely, the impossibility of studying refueling processes, fuel electrification processes, hydrodynamic processes, fuel drainage processes using pressurization, lower loading and discharge of tanks.

 The technical result consists in expanding the range of the studied technological processes that occur when refueling equipment with fuel and when feeding or pumping fuel along the highways to the refueling facility.

 This technical result is achieved by the fact that the known stand for hydraulic testing of products containing a supply tank, pumps connected in parallel with each other and connected by suction lines with valves installed on them to the outlet pipe of the supply tank, the pressure lines of the pumps are connected to the pipes for connecting the studied objects by pipelines with valves installed on them, and instrumentation, according to the invention, the stand is equipped with inverse to valves, a discharge valve, a tank electrically isolated from the ground, insulating inserts and a shut-off device with a predetermined flow shutoff time installed between the first and second insulating inserts in the medium supply line to the electrically isolated container, the outlet pipe of which is connected through the third insulating insert to the input inlet of the consumable a tank, the outlet pipe of which is connected by an additional pipe through the first check valve to the pipes for connecting the studied objects, and one of which has a fourth insulating insert, while the pressure line of one of the pumps through the second non-return valve and the relief valve is connected in front of the first non-return valve to an additional pipeline, and the suction line of one of the pumps is additionally connected to the pipe for connecting the studied objects, on which a fourth insulating insert is installed.

 The drawing shows a block diagram of a bench for hydraulic testing of products (studies of the process of closed refueling of aircraft, fire hazard situations from the accumulation of static electricity and hydrodynamic processes).

 The stand for hydraulic testing of products contains a supply tank 1, pumps 2, 3 (with different performance characteristics), installed in parallel and connected to the supply tank 1 via pipelines, the first non-return valve 4, the second non-return valve 5, relief valve 6, filter 7, counter 8 fluids. Valves 9-15 are installed on the pipelines. The outlet pipe 16 of the flow tank 1 is connected to the suction lines of the pumps 2 and 3 through the valves 14 and 15, respectively. Valves 17-21 are also mounted on the piping lines of the stand. The outlet pipe 16 of the flow tank 1 is connected by an additional pipe 22 with a valve 17 mounted on it and a first check valve 4 through parallel connected valves 11, 12 10 with pipes 23-25, respectively, for connecting the studied objects.

 An air compressor 27 is connected to the inlet pipe (without pos.) Of the tank 1 by means of a gas line 26 to study the fuel supply process by boosting.

 The suction line of the pump 2 through the valve 13 is connected to the pipe 25 for connecting the studied objects. Alternatively, as an object under study 28, an aircraft closed fueling unit is used, connected to a container 29 through a shut-off device (memory) 30 with a predetermined flow shut-off time. Capacity 29 is electrically isolated from the ground - mounted on special insulators (without pos.) To prevent the discharge of electrostatic charges.

 The object 28 under study, the container 29 and the supply tank 1 are electrically isolated from each other by means of insulating inserts 31. A shut-off device 30 with a predetermined flow shut-off time is installed between the first and second insulating inserts 31 in the medium supply line to the container 29, the outlet pipe of which is connected by a pipeline through the third insulating insert 31 and the valve 21 with the inlet pipe of the flow tank 1. The fourth insulating insert 31 is installed on the pipe 25 for connecting the test object 28.

 The pressure lines of the pump 2 (through valve 19) and pump 3 (through valve 20 and the second non-return valve 5) are connected through an exhaust valve 6 to an additional pipe 22, and through valve 18 are connected to a filter 7 and a counter 8 installed in series with the flow, the output of which through the valve 9 is connected to the parallel connected inputs of the valves 10-12, installed respectively on the pipes 25, 23 and 24 of the connection of the studied objects.

 To prevent damage to the elements of the stand in the event of an increase in pressure in the system above the permissible, caused, for example, by clogging the filter 7 or jamming of the counter 8, a relief valve 6 is installed. The relief valve 6 bypasses the fuel through the first non-return valve 4, bypassing valves 18 and 9, the filter 7 and the meter 8. The second non-return valve 5 protects the pump 3, which has a lower flow than the pump 2.

To determine the possibility of fire and explosion hazard situations from the accumulation of static electricity in the tank 29, instrumentation is installed:
an electrical sensor 32 connected to an oscilloscope 33 (for detecting a charge in a discharge);
an electric field strength sensor 34 connected to a voltmeter 35 (to determine the surface potential of electrostatic charges in the fuel);
microammeter 36 (for determining the leakage current).

 To study the processes of fuel electrification during refueling, the shut-off device 30 with a predetermined time for shutting off the flow is electrically isolated using insulating inserts 31.

 To study the effect of water hammer on the technological equipment of the studied object 28, pressure sensors 37 are installed. To record the pressure of the water hammer, these sensors are connected to an oscilloscope 38.

 An electrically insulated container 29 (rectangular in shape with dimensions 2x2x1.5 m) is connected through the valve 21 to the supply tank 1. In order to avoid electric shock to the personnel during the research, the container 29 is placed out of the reach of personnel. All observations are made from the control room.

 As the equipment on which the stand can be implemented, pumps 2, 3 STsN-60, STsL-20-24, TsSP-57/4 - K.V. are used. Rybakov, A.S. Alpatov, A.F. Rozhkov. Refueling aircraft with fuels and lubricants. - M .: Transport, 1975, p. 48-55 /, filters TF-2M, FGN-120/4 - in the same place, p. 62, 174 /, liquid counter 8 LZh-100-8 / 4 - in the same place, p. 39 /. The relief valve 6 can serve as a safety bypass valve of the tanker TZ-22/4 - in the same place, p. 39, 57 /. Check valves 4, 5 can serve as check valves of the CZS / 4 system - ibid., P. 163 /. As insulating inserts 31, fluoroplastic gaskets with a thickness of at least 10 mm can be installed.

 As a shut-off device 30 with a predetermined time for blocking the flow, electric valves of the type 585600/5 can be used - Technical act 83-20 for verifying the operability of the modified anti-shock device 862600 and pressure reducer 45.00.6153.030. - Zhukovsky, Motor Testing Complex ANTK them. A.N. Tupolev, 1983, p. I / installed in aircraft fuel systems. The main requirement for the shut-off device 30 is the selection of a tap with a flow shut-off time (from 0.1 to 5 s), necessary for solving research problems. Alternatively, a 585600 filling valve is installed in the figure with a flow shut-off time of not more than 1.5 s.

 Pressure sensors 37 are DDM-15 sensors, oscilloscopes 33, 38 are K20-22 / 5 magnetoelectric oscilloscopes - ibid., P. 2 /. As a sensor 34 of the electric field, a DE-62 sensor is used, which is a standard device of the electrical system of the Il-62 aircraft. The electric sensor 32 is a metal tube with a diameter of 6 mm with a metal ball with a diameter of 20 mm mounted on its lower end. A metal tube is inserted into the fluoroplastic sleeve.

At the claimed stand, fueling modules MZ-80, MZ-150, airfield tankers TZA-20-65053, TZA-40-5233N2, their equipment (filter monitors, closed filling tips with pressure regulators, transfer sleeves, dispensing guns) / 6 were tested - Matyushev A.V. Article: "Tests confirm the high level of tankers." - M.: Information and analytical magazine "Airport Partner", 3, 2000, p. 15 / and the processes occurring during refueling and tank loading, including:
- open gas station;
- closed gas station;
- top filling of the tank;
- lower tank discharge;
- discharge and loading of oil products by boost;
- the occurrence of fire hazard situations from the accumulation of static electricity;
- hydrodynamic processes with a sharp shutoff of the flow (water hammer).

 The sequence of the investigated processes is selected based on the task. After each test process, the liquid is drained into the supply tank 1. Before each test process, all shut-off valves are closed.

 The objects under study are complex technical means, as the equipment of the tanker, in terms of its hydraulic circuit, contains the main elements installed in series: fuel tank (tank), pump, filter, meter, dispensing sleeves with tips for closed or open refueling, as well as shut-off and control valves (gate valves, valves, taps) and instrumentation (pressure gauges, manovacuometers, pump shaft speed sensor).

 The equipment of the refueling unit is similar to the equipment of the tanker, except, the refueling unit does not contain a tank and, as a rule, does not contain a pump.

 The stand for hydraulic testing is operated as follows.

 Open refueling equipment.

 To study the processes of open refueling through valve 12, a test object is connected to the pipe 24 for connecting the studied objects (open refueling unit, not shown in the drawing).

 Valves 9, 12, 14, 18 and 19 open. All other valves are closed. The pump 2 is driven. The fuel from the supply tank 1 through the valve 14 is sucked in by the pump 2 and fed through the valves 19, 18 to the filter 7, where it is cleaned of mechanical impurities, and enters the meter 8, from where through the valves 9, 12 and the pipe 24 fuel enters the test object.

 If it is necessary to study the process of open filling, using valves 3 open valves 9, 12, 15, 20 and 18. All other valves are closed. The pump 3 is driven. The fuel from the supply tank 1 is sucked in by the pump 3 through the valve 15 and through the valve 20, the second non-return valve 5, the valve 18 is supplied to the filter 7. The further fuel path is the same as when the pump 2 was operating.

 If it is necessary to increase the fuel supply, while testing two products, the test objects (not shown in the drawing) are connected to the pipes 23 and 24, pumps 2 and 3 are turned on simultaneously. In this case, the valves 14, 15, 19, 20, 18, 9, 11 and 12 are in the open position. All other valves are closed. The fuel from the supply tank 1 through the valve 14 is sucked in by the pump 2 and through the valve 19 enters the inlet of the valve 18. At the same time, the fuel from the supply tank 1 through the valve 15 is sucked in by the pump 3 and through the valve 20 and the second check valve 5 also enters the inlet of the valve 18. Flows fuels from pumps 2 and 3 are combined and through valve 18, filter 7, meter 8, valve 9, valves 11, 12 through nozzles 23 and 24 are supplied to the objects under study.

 In the investigated process described above, open refueling, the following process parameters are determined: pump flow (capacity) (l / min) and pressure (pressure) (MPa) of the open refueling system depending on the capacity and configuration of fuel tanks and fuel temperature, throughput (l / min) dispensing pistols, flexible hoses and pressure loss (MPa) on them.

 All control and measuring instruments of the studied parameters during the operation of pump 2, pump 3, simultaneous operation of pumps 2 and 3, are installed on the connected object under study.

 Closed refueling equipment.

 To study the processes of closed refueling, the test object 28 (closed refueling unit) is connected to the pipe 25. Open the valves 9, 10, the locking device 30, the valves 14, 19, 18. All other valves are closed. The pump 2 is driven. The fuel from the supply tank 1 is piped through the valve 14, pump 2, valves 19, 18, filter 7, meter 8, valves 9, 10 enter the test object 28 and then through the shut-off device 30 into the container 29.

 In this case, the following process parameters are determined: pressure at the inlet and outlet of the object under study (pressure sensors 37) and supply (by meter 8). Based on the data obtained, the correspondence of the receiving abilities of the fuel systems of the equipment, for example, the aircraft fuel system, to the parameters of the refueling means, critical pressures when the technical devices of the closed refueling systems are triggered, the capacity of the tips for closed refueling, is determined.

 When conducting studies of closed refueling processes using pump 3, open valves 9, 10, locking device 30, valves 15, 20, 18. All other valves are closed. The pump 3 is driven. The fuel from the supply tank 1 is piped through valve 15, pump 3, valves 20, second check valve 5, valve 18, filter 7, meter 8, valves 9, 10 enter the test object 28 and then through the shut-off valve device 30 into capacity 29.

 It is also possible to use pumps 2 and 3 at the same time. Open the valves 14, 15, 19, 20, 18, 9 and 10, the locking device 30. All other valves are closed. Fuel from the supply tank 1 through valve 14, pump 2, valve 19 in one line, and through valve 15, pump 3, valve 20, the second non-return valve 5 in the other line enters through valve 18, filter 7, counter 8, valves 9, 10 into the test object 28 and then through the locking device 30 into the container 29.

 At the same time, pumps 2 and 3 are used if the performance of one pump is not enough for research.

 Top loading of tanks.

 In the study of the processes of the top loading, the studied object is connected to the pipe 23 (not shown in the drawing). Valves 14, 19, 18, 9 and 11 are opened. All other valves are closed. The pump 2 is driven. The fuel from the supply tank 1, through valve 14, pump 2, valves 19, 18, filter 7, meter 8, valves 9, 11 through the pipe 23 enters the object under study (not shown).

 When studying the processes of overhead loading, the following parameters are determined: optimal head (according to the pressure sensors installed on the studied object) and supply (according to counter 8) of the overhead loading, the effect of the head and supply on the time intervals of operation of technical devices for restricting loading installed on the studied object, for example, a tanker tanker.

 When studying the processes of the top loading using pump 3, valves 15, 20, 18, 9 and 11 are opened. All other valves are closed. The pump 3 is driven. Fuel from the supply tank 1, through valve 15, pump 3, valve 20, second non-return valve 5, valve 18, filter 7, meter 8, valves 9, 11 enters the test object through the pipe 23 (in the drawing not shown).

 When studying the processes of overfilling using pumps 2 and 3, valves 14, 15, 19, 20, 18, 9, and 11 are opened. All other valves are closed. Fuel from the supply tank 1 through valve 14, pump 2, valve 19 in one line, and through valve 15, pump 3, valve 20, the second non-return valve 5 in the other line enters through valve 18, filter 7, counter 8, valves 9, 11 through the pipe 23 enters the test object (not shown in the drawing).

 Lower discharge-loading tanks.

 The study of the process of lower loading using a pump 2. To the pipe 24 is connected to the investigated object (not shown). Valves 14, 19, 18, 9 and 12 are opened. All other valves are closed. The pump 2 is driven. Fuel from the supply tank 1, through the valve 14, pump 2, valves 19, 18, filter 7, meter 8, valves 9, 12 through the pipe 24 enters the test object (not shown).

 In this case, the pressure (according to the pressure sensors installed on the test object) and the flow (according to the meter 8) are determined. Based on the obtained data, the parameters of breathing and safety devices, loading restriction devices installed at the object under study, for example, a tanker tank, are optimized.

 Study of the process of lower loading using a pump 3. Open the valves 15, 20, 18, 9 and 12. All other valves are closed. The pump 3 is driven. Fuel from the supply tank 1, through valve 15, pump 3, valve 20, second non-return valve 5, valve 18, filter 7, meter 8, valves 9, 12 enters the test object through the pipe 24 (in the drawing not shown).

 Investigation of the process of lower loading using pumps 2 and 3. Open the valves 14, 15, 19, 20, 18, 9 and 11. All other valves are closed. Pumps 2 and 3 are driven. Fuel from the supply tank 1 through valve 14, pump 2, valve 19 in one line, and through valve 15, pump 3, valve 20, the second check valve 5 in another line enters through valve 18, filter 7, the counter 8, valves 9, 11 through the pipe 23 enters the test object (not shown).

 When researching the processes of the lower drain to the pipe 25, the studied object 28 is connected, for example, a tanker.

 The study of the process of lower discharge using a pump 2. Open the locking device 30. All other valves are closed. Fuel is pumped by the test object or by gravity through the shut-off device to the tank 29. In this case, the vacuum (vacuum) in the tank of the test object 28, the time interval for the operation of the respiratory and safety valves of the test object 28, and the fuel supply are determined. All control and measuring instruments are installed on the studied object 28. Based on the data obtained, the allowable fuel supply at the lower discharge is determined, the opening of the breathing and safety valves of the studied object 28 is also adjusted to limit the vacuum by the strength characteristics of the tank of the studied object 28.

 Drain-loading of petroleum products using boost.

 At the stand, the processes of discharge and loading of oil products with the help of boosting can be investigated. To study these processes, open the valve 13 with the connected object 28 of the study and the open locking device 30. The remaining valves are closed. Turn on the compressor 27. Air from the compressor 27 through the gas line 26 enters the flow tank 1 and squeezes fuel out of it through the open valve 13 into the object 28 and then into the tank 29.

 This determines the performance of the air supply (compressor device). At this stage, the required air flow rate is determined to achieve the desired discharge capacity (the capacity of the flow tank 1 is known) at a given allowable pressure in the tank 1.

 Investigation of fire hazard situations from the accumulation of static electricity.

 In the study of fire hazard situations from the accumulation of static electricity to the pipe 25 is connected, between two insulating inserts 31, the test object 28, for example, a refueling unit. Open the valves 9, 10, the locking device 30, the valves 14, 19, 18. All other valves are closed. The pump 2 is driven. The fuel from the supply tank 1 is piped through the valve 14, pump 2, valves 19, 18, filter 7, meter 8, valves 9, 10, the fourth insulating insert 31 enters the test object 28 and then through the second insulating an insert 31, a locking device 30, a first insulating insert 31 into a container 29.

 In the process of research, the pump flow is increased in increments of up to 400 l / min. The capacitance 29 records the values of the indicators of electrostatic loads: the surface potential of electrostatic charges (from the sensor 34 to the voltmeter 35), the leakage current (draining) of electrostatic charges from the capacitance 29 (readings of the microammeter 36), the charge transferred in the discharge (readings of the oscilloscope 33). Based on the obtained values of the indicators of electrostatic loads, safe refueling speeds of the equipment are determined.

 Investigation of fire hazard situations using a pump 3. Open valves 9, 10, shut-off device 30, valves 15, 20, 18. All other valves are closed. The pump 3 is driven. The fuel from the supply tank 1 is piped through valve 15, pump 3, valve 20, second check valve 5, valve 18, filter 7, meter 8, valves 9, 10, and the fourth insulating insert 31 enters the test object 28 and through the second insulating insert 31, the locking device 30, the first insulating insert 31 into the container 29.

 Investigation of fire hazard situations using pumps 2 and 3. Open valves 9, 10, shut-off device 30, valves 14, 15, 19, 20 and 18. All other valves are closed. Pumps 2 and 3 are driven. Fuel from the supply tank 1 through valve 14, pump 2, valve 19 in one line, and through valve 15, pump 3, valve 20, the second check valve 5 in another line enters through valve 18, filter 7, counter 8, valves 9, 10, the fourth insulating insert 31 into the test object 28 and then through the second insulating insert 31, the locking device 30, the first insulating insert 31 into the container 29.

 Studies of hydrodynamic processes.

 In the study of hydrodynamic processes, for example, water hammer, to the pipe 25 is connected to the test object 28 (refueling unit). Open the valves 9, 10, the locking device 30, the valves 14, 19, 18. All other valves are closed. The pump 2 is driven. The fuel from the supply tank 1 through the pipeline through the valve 14, pump 2, valves 19, 18, filter 7, meter 8, valves 9, 10 enters the test object and then through the shut-off device 30 into the tank 29. Water hammer create by blocking the fuel flow shutoff device 30 at volumetric flow rates (performance), set depending on the objectives of the study.

 The registration of pressure values in the technological equipment of the studied object 28 is carried out by sensors 37 and displayed on the oscilloscope 38. As a rule, pressure sensors 37 in the studied object, for example, the refueling unit, are installed at the inlet (downstream) of the refueling unit, at the input and output of the unit filter refueling, and at the outlet of the refueling unit. Based on the results obtained, the permissible volumetric rates of refueling, the possibility of the occurrence of undamped pressure fluctuations, the influence of the pressure of the hydroblow on the strength characteristics of the equipment of the studied object are determined 28.

 Studies of hydrodynamic processes using pumps 2 and 3 are carried out if it is necessary to increase the productivity of fuel pumping. In this case, open the valves 9, 10, the locking device 30, valves 14, 15, 19, 20 and 18. All other valves are closed. Pumps 2 and 3 are driven. Fuel from the supply tank 1 through valve 14, pump 2, valve 19 in one line, and through valve 15, pump 3, valve 20, the second check valve 5 in another line enters through valve 18, filter 7, counter 8, valves 9, 10 to the test object and then through the shut-off device 30 to the tank 29. A water hammer is created by shutting off the fuel flow by the shut-off device 30.

 The registration of pressure values in the technological equipment of the investigated object 28 is carried out in the same way as when working with pump 2.

 The use of this stand will allow expanding the range of the studied technological processes that occur when refueling equipment with fuel and when supplying or pumping fuel along the lines to the refueling facility, namely, in addition to determining hydraulic resistance and strength tests, to study the dynamics of fuel electrification and hydrodynamic pressure fluctuations, and, based on the results obtained, increase the safety of refueling equipment.

Sources of information
1. "Methodology for certification of electrostatic intrinsic safety of auto-tankers." M.: 25 GosNIIMO RF, 1986. Approved by the commander of the military unit 25968 6. 11. 1986, p. 8, 16-19.

 2. Guidelines for testing fuel service equipment. Book 2. Methods for determining the technical and operational parameters of technical means of fuel service. M .: Military Publishing, 1989, p. 115, 401.

 3. Copyright certificate of the USSR 731336, IPC F 28 F 27/00, 1978 (prototype).

 4. K.V. Rybakov, A.S. Alpatov, A.F. Rozhkov. Refueling aircraft with fuels and lubricants. - M .: Transport, 1975, p. 48-55, 62, 174, 39, 57, 163.

 5. Technical act 83-20 to test the performance of the modified anti-shock device 862600 and pressure reducer 45.00.6153.030. - Zhukovsky, Motor Testing Complex ANTK them. A.N. Tupolev, 1983, p. 1-2.

 6. Matyushev A.V. Tests confirm the high level of tankers. -M. : Information and analytical magazine "Airport Partner", 3, 2000, p. fifteen.

Claims (2)

 1. A stand for hydraulic testing of products containing a supply tank, pumps connected in parallel to each other and connected by suction lines with valves installed on them to the outlet pipe of the supply tank, pressure lines of the pumps are connected to pipes for connecting the objects under study through pipelines with valves installed on them , and instrumentation, characterized in that the stand is equipped with check valves, a relief valve, an electrically isolated tank from the ground , insulating inserts and a locking device with a predetermined flow shutoff time, installed between the first and second insulating inserts in the medium supply line to an electrically insulated container, the outlet pipe of which is connected through the third insulating insert to the inlet pipe of the flow tank, the outlet pipe of which is connected by an additional pipe through the first non-return valve to the nozzles for connecting the studied objects, one of which has a fourth insulating insert, while the pressure line of one of the pumps through the second non-return valve and a relief valve is connected before the first non-return valve to an additional pipeline.  2. A bench for hydraulic testing of products according to claim 1, characterized in that the suction line of one of the pumps is additionally connected to a pipe for connecting the objects under study, on which a fourth insulating insert is installed.