CN115366776B - Pressure relief device of road tank truck unloading facility and use method thereof - Google Patents
Pressure relief device of road tank truck unloading facility and use method thereof Download PDFInfo
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- CN115366776B CN115366776B CN202211082176.7A CN202211082176A CN115366776B CN 115366776 B CN115366776 B CN 115366776B CN 202211082176 A CN202211082176 A CN 202211082176A CN 115366776 B CN115366776 B CN 115366776B
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- loading
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000011344 liquid material Substances 0.000 claims abstract description 150
- 239000007789 gas Substances 0.000 claims description 49
- 239000003915 liquefied petroleum gas Substances 0.000 claims description 10
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 6
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 4
- 239000001273 butane Substances 0.000 claims description 4
- 239000002283 diesel fuel Substances 0.000 claims description 4
- 239000003502 gasoline Substances 0.000 claims description 4
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 claims description 4
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 claims description 4
- 239000001294 propane Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 3
- 239000001569 carbon dioxide Substances 0.000 claims description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 2
- 239000011261 inert gas Substances 0.000 claims description 2
- 239000003350 kerosene Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 239000000047 product Substances 0.000 claims description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims description 2
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 2
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims 1
- 230000005484 gravity Effects 0.000 description 14
- 238000007789 sealing Methods 0.000 description 8
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 229920001971 elastomer Polymers 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 241000209202 Bromus secalinus Species 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000036561 sun exposure Effects 0.000 description 1
- 239000012855 volatile organic compound Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60P—VEHICLES ADAPTED FOR LOAD TRANSPORTATION OR TO TRANSPORT, TO CARRY, OR TO COMPRISE SPECIAL LOADS OR OBJECTS
- B60P3/00—Vehicles adapted to transport, to carry or to comprise special loads or objects
- B60P3/22—Tank vehicles
- B60P3/224—Tank vehicles comprising auxiliary devices, e.g. for unloading or level indicating
- B60P3/225—Adaptations for pumps or valves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60P—VEHICLES ADAPTED FOR LOAD TRANSPORTATION OR TO TRANSPORT, TO CARRY, OR TO COMPRISE SPECIAL LOADS OR OBJECTS
- B60P3/00—Vehicles adapted to transport, to carry or to comprise special loads or objects
- B60P3/22—Tank vehicles
- B60P3/224—Tank vehicles comprising auxiliary devices, e.g. for unloading or level indicating
- B60P3/2245—Adaptations for loading or unloading
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D88/00—Large containers
- B65D88/02—Large containers rigid
- B65D88/12—Large containers rigid specially adapted for transport
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/22—Safety features
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/54—Gates or closures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
- B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
- B67D7/00—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes
- B67D7/04—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes for transferring fuels, lubricants or mixed fuels and lubricants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
- B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
- B67D7/00—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes
- B67D7/06—Details or accessories
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Transportation (AREA)
- Vehicle Body Suspensions (AREA)
- Loading And Unloading Of Fuel Tanks Or Ships (AREA)
Abstract
The invention discloses a pressure relief device of a road tank truck underfilling facility and a use method thereof. The pressure relief device comprises a pressure relief device (7), and the pressure relief device is provided with a pressure relief device shell. The inner cavity of the pressure relief shell is provided with a piston (21), and the piston can move along the axial direction of the pressure relief shell. The piston divides the inner cavity of the pressure release device shell into a liquid material chamber and an air chamber, the liquid material chamber is positioned below the air chamber, and the liquid material chamber is connected with a pipe section of a loading pump outlet pipeline of a road tank truck lower loading facility, which is positioned between a numerical control valve outlet and a lower loading crane pipe inlet, through a pressure balance pipeline (15). The pressure release device can be further provided with an upper limiting plate (181), a lower limiting plate (182), an upper buffer spring (191) and a lower buffer spring (192). The invention discloses a method for using a pressure relief device of a road tank truck underfilling facility. The invention is mainly used in the under-loading facilities of highway tank trucks in petrochemical plants and storage areas.
Description
Technical Field
The invention belongs to the technical field of storage and transportation of liquid oil products, liquefied petroleum gas or chemicals in petrochemical industry, and relates to a pressure relief device of a road tank truck lower installation facility and a use method thereof.
Background
The transportation of the highway tank truck is one of the main delivery modes of petrochemical liquid materials such as gasoline, diesel oil, liquefied petroleum gas and the like. Along with the increasing environmental awareness, in order to realize the organized collection and treatment of volatile organic compounds, the loading mode of highway tank trucks such as gasoline, diesel oil and the like is developed from top loading to bottom loading, and the bottom loading crane pipe adopts a dry type quick connector (also called a dry type separating valve) which is the same as the liquefied petroleum gas loading crane pipe, and the dry type quick connector can effectively avoid the leakage of liquid materials when the bottom loading crane pipe is separated from the tank truck. When the loading amount of the liquid material reaches the loading amount set by the flowmeter, the flowmeter controls and closes the numerical control valve through the signal wire, and then the dry type quick connector of the lower loading crane pipe is manually separated from the dry type quick connector on the highway tank truck. In order to meet the fairness of trade handover, the numerical control valve after the outlet of the flowmeter is in a closed state until the next loading in advance so as to ensure that no liquid material flows in the flowmeter; that is, the pipeline between the outlet of the numerical control valve and the dry quick connector of the lower loading arm is always in a closed state when the loading operation is not performed. The higher ambient temperature in summer or the long time of sun exposure in other seasons can cause the temperature and pressure of the liquid material in the closed pipeline between the outlet of the numerical control valve and the dry quick connector of the down loading arm to rise and expand in volume. When the installation under the highway tank truck does not take pressure relief measures on the closed pipeline, the following problems exist: the sealing rubber ring at the connection part of the outlet of the lower loading crane tube and the dry type quick connector, the sealing rubber ring at the rotation part of the lower loading crane tube, the sealing gasket of the upper flange of the lower loading crane tube and the like are leaked with liquid materials, so that the possibility of accumulating explosive gas in the loading area is increased, and potential safety hazards exist.
In order to solve the problems, some existing road tank truck underfills adopt a second safety valve or a check valve to release pressure on the closed pipeline. The inlet of the second safety valve or the check valve is communicated with a pipe section of the loading pump outlet pipeline between the numerical control valve outlet and the inlet of the lower loading crane pipe through a pipeline, and the outlet of the second safety valve or the check valve is communicated with a pipe section of the loading pump outlet pipeline between the loading pump outlet valve outlet and the flowmeter inlet through a pipeline. The road tank truck lower mounting facility is also provided with a first safety valve, the inlet of the first safety valve is communicated with a pipe section of the loading pump outlet pipeline, which is positioned between the loading pump outlet valve outlet and the flowmeter inlet, through a pipeline, and the outlet of the first safety valve is communicated with a pipe section of the loading pump inlet pipeline, which is positioned between the tank root valve outlet and the loading pump inlet valve inlet, through a pipeline. When the second safety valve or the check valve is used for pressure relief, the overpressure liquid material is discharged to the storage tank through the second safety valve (or the check valve) and the first safety valve, and the seller can repeatedly meter and cheat the pressure-relieved liquid material easily. After pressure relief, if vacuum occurs in a closed pipeline between an outlet of the numerical control valve and a dry type quick connector of a lower loading crane pipe due to temperature drop, the opening of the numerical control valve and the dry type quick connector is difficult. In addition, in the scheme of cascade pressure relief of the second safety valve and the first safety valve, the back pressure of the second safety valve is high, and the shape selection is difficult.
Disclosure of Invention
The invention aims to provide a pressure relief device of a road tank truck underfilling facility and a use method thereof, which are used for solving the following problems of the pressure relief device and the pressure relief method of the existing road tank truck underfilling facility: the overpressure liquid material in the closed pipeline between the outlet of the numerical control valve and the dry quick connector of the lower loading crane pipe is discharged to the storage tank, and a seller can easily repeatedly measure and cheat the discharged liquid material; after pressure relief, if the closed pipeline encounters temperature drop and vacuum occurs, the numerical control valve and the dry type quick connector are difficult to open; in the scheme of cascade pressure relief of the second safety valve and the first safety valve, the back pressure of the second safety valve is high, and the shape selection is difficult.
In order to solve the problems, the invention adopts the following technical scheme: the utility model provides a pressure relief device of highway tank car equipment under-loading facility which characterized in that: the pressure relief device comprises a pressure relief device, wherein the pressure relief device is provided with a pressure relief device shell, a piston is arranged in an inner cavity of the pressure relief device shell and can move along the axial direction of the pressure relief device shell, the piston divides the inner cavity of the pressure relief device shell into a liquid material chamber and an air chamber, the liquid material chamber is positioned below the air chamber, and a pipe section between a loading pump outlet pipeline of a loading facility of the road tank truck and a loading arm inlet is connected through a pressure balance pipeline.
The pressure relief device is further characterized in that: the pressure release device shell comprises a piston cylinder, an upper sealing head connected with the upper end of the piston cylinder and a lower sealing head connected with the lower end of the piston cylinder, wherein the piston is arranged in the inner cavity of the piston cylinder, an upper limiting plate is arranged above the piston, a lower limiting plate is arranged below the piston, the upper limiting plate and the lower limiting plate are arranged in the inner cavity of the piston cylinder, the upper limiting plate is close to the upper end of the piston cylinder, and the lower limiting plate is close to the lower end of the piston cylinder.
The pressure relief device is further characterized in that: an upper buffer spring is arranged on the lower surface of the upper limiting plate, the upper end of the upper buffer spring is fixed on the lower surface of the upper limiting plate, the lower end of the upper buffer spring is a free end, a lower buffer spring is arranged on the upper surface of the lower limiting plate, the lower end of the lower buffer spring is fixed on the upper surface of the lower limiting plate, and the upper end of the lower buffer spring is a free end.
The invention relates to a method for using a pressure relief device of a road tank truck unloading facility, which is characterized in that: after the loading is stopped by the installation and the installation under the highway tank truck, the liquid material in the closed pipeline arranged between the outlet of the numerical control valve and the dry type quick connector of the lower loading crane pipe is decompressed by the liquid material chamber of the pressure releaser after the temperature and the pressure rise and the volume expansion of the liquid material arranged under the highway tank truck, and the piston mainly or completely moves upwards under the pressure of the liquid material in the liquid material chamber, so that the volume of the liquid material chamber is increased.
The above method of use is further characterized by: when the temperature and pressure of the liquid material in the closed pipeline and the liquid material chamber are reduced and the volume is reduced, the piston mainly moves downwards under the pressure of the gas in the gas chamber, so that the volume of the liquid material chamber is reduced, and the liquid material in the liquid material chamber returns to the closed pipeline through the pressure balance pipeline;
or after the road tank truck is installed below and is loaded next time, the liquid material in the liquid material chamber returns to the pipe section of the loading pump outlet pipeline, which is positioned between the numerical control valve outlet and the inlet of the lower loading arm, through the pressure balance pipeline.
The invention has the following beneficial effects: (1) After the loading is stopped by the lower installation of the highway tank truck, the liquid material in the closed pipeline arranged between the outlet of the numerical control valve and the dry quick connector of the lower loading crane pipe is decompressed by the liquid material chamber of the decompression device after the temperature and the pressure rise and the volume expansion of the liquid material; when the temperature and pressure of the liquid material in the closed pipeline and the liquid material chamber are reduced and the volume is reduced, the liquid material in the liquid material chamber returns to the closed pipeline. Or after the next loading is started by the lower mounting construction of the highway tank truck, the liquid material in the liquid material chamber returns to the pipe section of the loading pump outlet pipeline between the numerical control valve outlet and the inlet of the lower loading crane pipe. Because the liquid material is not discharged to the storage tank, the possibility that the seller repeatedly measures and cheats the discharged liquid material can be eliminated, and the fairness of trade handover is guaranteed. (2) After pressure relief, if the temperature of a closed pipeline between an outlet of the numerical control valve and a dry type quick connector of a lower loading crane pipe is reduced, the pressure of liquid materials is reduced, the liquid materials in the liquid materials chamber can return to the closed pipeline, so that vacuum is prevented from being generated, and the difficulty in opening the numerical control valve and the dry type quick connector is avoided. (3) The pressure release device is used for releasing the pressure of the closed pipeline without using a safety valve, and the pressure release device is different from the scheme of cascade pressure release of the second safety valve and the first safety valve in the existing road tank truck downloading facility, and does not have the problems of high back pressure and difficult shape selection of the second safety valve. (4) The liquid material in the closed pipeline can enter the liquid material chamber of the pressure release device to release pressure, so that leakage of the liquid material at the positions of the sealing rubber ring at the connection part of the outlet of the lower loading crane tube and the dry type quick connector, the sealing rubber ring at the upper rotation part of the lower loading crane tube, the sealing gasket of the upper flange of the lower loading crane tube and the like is prevented. (5) The pressure release device is simple in structure, safe and efficient in use method and high in feasibility.
The invention is mainly used in the under-loading facilities of highway tank trucks in petrochemical plants and storage areas.
The invention will be described in further detail with reference to the drawings and the detailed description. The drawings and detailed description are not intended to limit the scope of the invention as claimed.
Drawings
Fig. 1 is a schematic view of a road tank truck underfilling facility and a storage tank using the pressure relief device of the present invention.
Fig. 2 is a schematic view of a vertically disposed, piston compressed cushion spring of the pressure relief device of the present invention.
Fig. 3 is a schematic view of the vertically disposed, piston compressing upper cushion spring of the pressure relief device of the present invention.
Fig. 4 is a schematic view of the pressure relief of the present invention with the piston not compressing the upper and lower cushion springs in an inclined arrangement.
In fig. 1 to 4, the same reference numerals denote the same technical features. Reference numerals denote: 1-a storage tank; 2-a loading pump; 3-a flow meter; 4-a numerical control valve; 5-loading a loading arm; 6-a dry quick connector of a lower loading crane pipe 5; 7, a pressure release device; 8-a loading pump inlet pipeline; 9-a loading pump outlet pipeline; 10-a tank root valve; 11-loading pump inlet valve; 12-a filter; 13-check valve; 14-a loading pump outlet valve; 15-a pressure equalization conduit; 16-gas injection pipe; 17-a pressure gauge; 181-an upper limit plate; 182-lower limiting plate; 191-upper buffer spring; 192-lower buffer spring; 20-a piston cylinder; 201-an upper end socket; 202-a lower end socket; 21-a piston; 22-an air injection valve; 23-valve; 24-a safety valve; 25-a safety valve inlet duct; 26-a relief valve outlet duct; 27-signal lines.
In fig. 2 to 4, a pressure equalization line 15 is also shown.
Detailed Description
The under-loading facility of the highway tank truck shown in fig. 1 is provided with a loading pump 2, a safety valve 24, an under-loading crane pipe 5 and a pressure release device 7. The pressure relief device of the under-loading facility of the highway tank truck is called as a pressure relief device for short and comprises a pressure relief device 7. A loading pump inlet pipeline 8 is arranged between the inlet of the loading pump 2 and the outlet of the tank root valve 10, a loading pump outlet pipeline 9 is arranged between the outlet of the loading pump 2 and the inlet of the lower loading crane pipe 5, and the inlet of the tank root valve 10 is connected with the storage tank 1 through a pipeline. The loading pump inlet pipeline 8 is sequentially provided with a loading pump inlet valve 11 and a filter 12 along the direction from the outlet of the tank root valve 10 to the inlet of the loading pump 2, the loading pump outlet pipeline 9 is sequentially provided with a check valve 13, a loading pump outlet valve 14, a flowmeter 3 and a numerical control valve 4 along the direction from the outlet of the loading pump 2 to the inlet of the lower loading crane pipe 5, and a signal line 27 is arranged between the flowmeter 3 and the numerical control valve 4. The inlet of the safety valve 24 is connected to one end of a safety valve inlet conduit 25, and the other end of the safety valve inlet conduit 25 is connected to a pipe section of the loading pump outlet conduit 9 between the outlet of the loading pump outlet valve 14 and the inlet of the flow meter 3. The outlet of the safety valve 24 is connected to one end of a safety valve outlet pipe 26, and the other end of the safety valve outlet pipe 26 is connected to a pipe section of the loading pump inlet pipe 8 located between the outlet of the tank root valve 10 and the inlet of the loading pump inlet valve 11. The safety valve inlet pipe 25 and the safety valve outlet pipe 26 are provided with a valve 23, and the valve 23 is used for cutting off liquid materials during maintenance of the safety valve 24.
The pressure release device 7 is provided with a pressure release device shell, the inner cavity of the pressure release device shell is provided with a piston 21, and the piston 21 can move along the axial direction of the pressure release device shell. The piston 21 divides the inner cavity of the pressure relief housing into a liquid material chamber and an air chamber, the liquid material chamber being located below the air chamber. The liquid material chamber is connected with a pipe section of the loading pump outlet pipeline 9 between the outlet of the numerical control valve 4 and the inlet of the lower loading arm 5 through a pressure balance pipeline 15; one end of the pressure balancing pipeline 15 is connected with the pipe section, and the other end of the pressure balancing pipeline 15 is connected with the liquid material chamber.
Referring to fig. 1 to 4, the pressure relief device housing is composed of a piston cylinder 20, an upper seal head 201 connected with the upper end of the piston cylinder 20, and a lower seal head 202 connected with the lower end of the piston cylinder 20, and the piston 21 is arranged in the inner cavity of the piston cylinder 20. An upper limiting plate 181 is arranged above the piston 21, a lower limiting plate 182 is arranged below the piston 21, the upper limiting plate 181 and the lower limiting plate 182 are arranged in the inner cavity of the piston cylinder 20, and the edges of the upper limiting plate 181 and the lower limiting plate 182 are welded with the inner surface of the piston cylinder 20. The upper limit plate 181 is close to the upper end of the piston cylinder 20, and the lower limit plate 182 is close to the lower end of the piston cylinder 20. The piston 21, upper and lower stop plates 181, 182 are perpendicular to the centerline of the pressure relief housing. The end of the pressure balance pipeline 15 connected with the liquid material chamber is generally positioned on the lower end socket 202, the upper end socket 201 is provided with an air injection pipe 16 and a pressure gauge 17, and the air injection pipe 16 is provided with an air injection valve 22.
An upper buffer spring 191 may be disposed on the lower surface of the upper limiting plate 181, and the upper end of the upper buffer spring 191 is welded on the lower surface of the upper limiting plate 181, and the lower end of the upper buffer spring 191 is a free end. The upper surface of the lower limiting plate 182 is provided with a lower buffer spring 192, the lower end of the lower buffer spring 192 is welded on the upper surface of the lower limiting plate 182, and the upper end of the lower buffer spring 192 is a free end. The upper and lower buffer springs 191 and 192 serve as buffer stops for the piston 21. The upper buffer spring 191 and the lower buffer spring 192 are generally provided in 3 to 8, and may be a cylindrical spring, a disc spring, a plate spring, or the like.
The upper limiting plate 181 is provided with a gas channel, and the lower limiting plate 182 is provided with a liquid material channel. The gas channel and the liquid material channel are generally openings, and the shape of the openings can be round, square or triangular. The holes on the upper limit plate 181 and the lower limit plate 182 are provided in plurality and evenly distributed.
Referring to fig. 4, the included angle a between the centerline of the pressure relief housing and the vertical is typically 0-30 degrees. And when the included angle A is 0 degree, the pressure relief device shell and the pressure relief device 7 are vertically arranged. And when the included angle A is larger than 0 degrees and smaller than or equal to 30 degrees, the pressure relief device shell and the pressure relief device 7 are obliquely arranged. The pressure equalization conduit 15 is generally coaxial with the centerline of the pressure relief housing.
The cross section of the piston 21, the upper limit plate 181, the lower limit plate 182 and the piston cylinder 20 are the same, and are round, rectangular, elliptic or 8-shaped. The shape of the upper head 201 and the lower head 202 depends on the cross-sectional shape of the above-described components. In a preferred embodiment of the present invention, the cross-sectional shape of the piston cylinder 20 is circular, the piston cylinder 20 is cylindrical, and the piston 21 is cylindrical.
The materials of the pressure release housing, the upper limiting plate 181 and the lower limiting plate 182 are generally carbon steel, stainless steel or alloy steel, etc. The upper buffer spring 191 and the lower buffer spring 192 are made of spring steel, and are excellent in corrosion resistance to liquid materials. The material of the piston 21 should ensure that no spark is generated when the piston 21 rubs or collides with the pressure relief device shell (comprising the piston cylinder 20), the upper buffer spring 191, the lower buffer spring 192, the upper limiting plate 181 and the lower limiting plate 182, and the corrosion resistance to liquid materials is also ensured to be excellent; the material of the piston 21 is typically aluminum, fluororubber, nitrile rubber, polytetrafluoroethylene, or the like.
The road tanker shown in figure 1 is installed under it, comprising all the components and pipes except the tank 1.
When the road tank truck is normally loaded, the dry type quick connector 6 of the lower loading crane pipe 5 is connected with the dry type quick connector on the road tank truck and is opened. The loading pump 2 is opened, the tank root valve 10, the loading pump inlet valve 11, the loading pump outlet valve 14 and the numerical control valve 4 are all opened, and the check valve 13 and the safety valve 24 are in a normal working state. The liquid material in the storage tank 1 enters the highway tank truck through the loading pump inlet pipeline 8, the loading pump 2, the loading pump outlet pipeline 9, the lower loading crane pipe 5, the dry type quick connector 6 of the lower loading crane pipe 5 and the dry type quick connector of the highway tank truck. At the same time, the liquid material in the pipe section of the loading pump outlet pipe 9 between the outlet of the numerical control valve 4 and the inlet of the lower loading arm 5 enters the liquid material chamber of the pressure release device 7 through the pressure balancing pipe 15, and the volume of the liquid material chamber is the smallest (in case the liquid material chamber is full of liquid material).
When the loading amount of the liquid material reaches the loading amount set by the flowmeter 3, the flowmeter 3 controls and closes the numerical control valve 4 through the signal line 27, then the dry type quick connector 6 of the lower loading crane pipe 5 is manually separated from the dry type quick connector on the highway tank truck, the dry type quick connector 6 of the lower loading crane pipe 5 is closed, and the loading operation is finished; the loading pump 2 stops running, the states of other valves are unchanged, and the volume of the liquid material chamber is kept to be minimum. The use method of the pressure release device 7 in the pressure release device comprises the steps that after the loading is stopped when the road tank truck is installed under the road tank truck, the liquid material in a closed pipeline (called as a closed pipeline for short) between the outlet of the numerical control valve 4 and the dry type quick connector 6 of the lower loading arm 5 is subjected to temperature and pressure rise and volume expansion before the next loading, and enters a liquid material chamber of the pressure release device 7 through a pressure balance pipeline 15 for pressure release. The piston 21 is moved upwards mainly or completely by the pressure of the liquid material in the liquid material chamber, which is simply referred to as liquid material pressure, the volume of the liquid material chamber increasing.
When the temperature and pressure of the liquid material in the closed pipeline and the liquid material chamber are reduced and the volume is reduced, the piston 21 mainly moves downwards under the pressure of the gas in the gas chamber, so that the volume of the liquid material chamber is reduced, and the liquid material in the liquid material chamber returns to the closed pipeline through the pressure balance pipeline 15.
Or after the next loading is started in the under-loading construction of the highway tank truck, the liquid material in the liquid material chamber returns to the pipe section of the loading pump outlet pipeline 9 between the outlet of the numerical control valve 4 and the inlet of the under-loading crane pipe 5 through the pressure balance pipeline 15, and then enters the highway tank truck through the under-loading crane pipe 5, the dry type quick connector 6 of the under-loading crane pipe 5 and the dry type quick connector on the highway tank truck. After this process is completed, the volume of the liquid material chamber is minimized.
When the volume of the liquid material chamber is increased, the volume of the air chamber is reduced; when the volume of the liquid material chamber is maximum, the volume of the air chamber is minimum. When the volume of the liquid material chamber is reduced, the volume of the air chamber is increased; when the volume of the liquid material chamber is minimum, the volume of the air chamber is maximum. And vice versa. When the volume of the liquid material chamber changes, the liquid material is always filled in the liquid material chamber.
With the pressure release device 7 provided with the upper limit plate 181, the lower limit plate 182, the upper buffer spring 191 and the lower buffer spring 192, when the liquid material in the closed pipeline enters the liquid material chamber, in the case that the piston 21 compresses the lower buffer spring 192 (see fig. 2), when the resultant force of the liquid material pressure received by the lower surface of the piston 21 and the elastic force of the lower buffer spring 192 is greater than the resistance of the upward movement of the piston 21, the piston 21 moves upward. The resistance force of the upward movement of the piston 21 is a resultant force of the pressure of the gas in the gas chamber received by the upper surface of the piston 21, the friction force between the side surface of the piston 21 and the inner surface of the piston cylinder 20, and the gravity force of the piston 21 when the pressure release device 7 is vertically arranged, and is a resultant force of the pressure of the gas in the gas chamber received by the upper surface of the piston 21, the friction force between the side surface of the piston 21 and the inner surface of the piston cylinder 20, and the gravity force component of the piston 21 along the center line direction of the pressure release device housing when the pressure release device 7 is obliquely arranged.
When the liquid material in the closed pipe enters the liquid material chamber, the piston 21 moves upward when the liquid material pressure applied to the lower surface of the piston 21 is greater than the resistance of the piston 21 to upward movement without compressing the lower buffer spring 192 and the upper buffer spring 191 by the piston 21 (see fig. 1 and 4). The resistance force of the upward movement of the piston 21 is a resultant force of the pressure of the gas in the gas chamber received by the upper surface of the piston 21, the friction force between the side surface of the piston 21 and the inner surface of the piston cylinder 20, and the gravity force of the piston 21 when the pressure release device 7 is vertically arranged, and is a resultant force of the pressure of the gas in the gas chamber received by the upper surface of the piston 21, the friction force between the side surface of the piston 21 and the inner surface of the piston cylinder 20, and the gravity force component of the piston 21 along the center line direction of the pressure release device housing when the pressure release device 7 is obliquely arranged.
When the liquid material in the closed circuit enters the liquid material chamber, in the case that the piston 21 compresses the upper buffer spring 191 (see fig. 3), the piston 21 moves upward when the liquid material pressure applied to the lower surface of the piston 21 is greater than the resistance of the piston 21 to move upward. The resistance of the upward movement of the piston 21 is the resultant force of the pressure of the gas in the gas chamber and the elastic force of the upper buffer spring 191, the friction force between the side surface of the piston 21 and the inner surface of the piston cylinder 20, and the gravity of the piston 21, which are received by the upper surface of the piston 21, when the pressure release 7 is vertically arranged, and the resultant force of the pressure of the gas in the gas chamber and the elastic force of the upper buffer spring 191, the friction force between the side surface of the piston 21 and the inner surface of the piston cylinder 20, and the gravity component force of the piston 21 along the center line direction of the pressure release housing, which are received by the upper surface of the piston 21, when the pressure release 7 is obliquely arranged.
When the liquid material in the liquid material chamber returns to the closed pipeline, or when the road tank truck is installed below and is started to load next time and the liquid material in the liquid material chamber returns to the pipe section between the outlet of the numerical control valve 4 and the inlet of the lower loading arm 5, under the condition that the piston 21 compresses the upper buffer spring 191 (see fig. 3), when the pressure release device 7 is vertically arranged, when the resultant force of the pressure of the gas in the gas chamber received by the upper surface of the piston 21 and the elastic force of the upper buffer spring 191 and the gravity of the piston 21 is larger than the downward moving resistance of the piston 21, or when the pressure release device 7 is obliquely arranged, when the resultant force of the pressure of the gas in the gas chamber received by the upper surface of the piston 21 and the elastic force of the upper buffer spring 191 and the gravity component of the piston 21 along the center line direction of the shell of the pressure release device is larger than the downward moving resistance of the piston 21, the piston 21 moves downward. The resistance to the downward movement of the piston 21 is the resultant of the pressure of the liquid material received by the lower surface of the piston 21 and the frictional force between the side surface of the piston 21 and the inner surface of the piston cylinder 20.
When the liquid material in the liquid material chamber returns to the closed pipeline, or when the road tank truck is installed below and is started to load next time and the liquid material in the liquid material chamber returns to the pipe section of the loading pump outlet pipeline 9 between the outlet of the numerical control valve 4 and the inlet of the lower loading arm 5, under the condition that the piston 21 does not compress the upper buffer spring 191 and the lower buffer spring 192 (see fig. 1 and 4), when the pressure release device 7 is vertically arranged, when the resultant force of the pressure of the gas in the gas chamber received by the upper surface of the piston 21 and the gravity of the piston 21 is greater than the resistance of the downward movement of the piston 21, or when the pressure release device 7 is obliquely arranged, when the resultant force of the gravity component force of the gas in the gas chamber received by the upper surface of the piston 21 and the direction of the central line of the shell of the pressure release device is greater than the resistance of the downward movement of the piston 21, the piston 21 moves downward. The resistance to the downward movement of the piston 21 is the resultant of the pressure of the liquid material received by the lower surface of the piston 21 and the frictional force between the side surface of the piston 21 and the inner surface of the piston cylinder 20.
When the liquid material in the liquid material chamber returns to the closed pipeline, or when the road tank truck is installed below and is started to load next time and the liquid material in the liquid material chamber returns to the pipe section of the loading pump outlet pipeline 9 between the outlet of the numerical control valve 4 and the inlet of the lower loading arm 5, under the condition that the piston 21 compresses the lower buffer spring 192 (see fig. 2), when the pressure release device 7 is vertically arranged, when the resultant force of the pressure of the gas in the gas chamber received by the upper surface of the piston 21 and the gravity of the piston 21 is larger than the resistance of the downward movement of the piston 21, or when the pressure release device 7 is obliquely arranged, when the pressure of the gas in the gas chamber received by the upper surface of the piston 21 and the resultant force of the gravity component of the piston 21 along the center line direction of the shell of the pressure release device are larger than the resistance of the downward movement of the piston 21, the piston 21 moves downward. The resistance of the downward movement of the piston 21 is the resultant of the liquid material pressure applied to the lower surface of the piston 21 and the elastic force of the lower buffer spring 192, and the frictional force between the side surface of the piston 21 and the inner surface of the piston cylinder 20.
When the volume of the liquid material chamber reaches a minimum, the liquid material returning process is stopped. When the volume of the liquid material chamber is minimum, the liquid material in the liquid material chamber is reserved in the liquid material chamber; the piston 21 is positioned to compress the lower buffer spring 192 by the maximum amount, and the compression deformation amount of the lower buffer spring 192 is the maximum.
The piston 21 stops moving upward or downward when the resultant force of the above-described various forces received in the various states is zero.
According to the invention, the pressure of the liquid material in the liquid material chamber received by the lower surface of the piston 21 and the pressure of the gas in the gas chamber received by the upper surface of the piston 21 (as well as the elasticity of the upper buffer spring 191, the elasticity of the lower buffer spring 192, the gravity of the piston 21, the gravity component along the central line direction of the pressure release device shell and the friction between the side surface of the piston 21 and the inner surface of the piston cylinder 20) are all acting forces, and the units are newton, kilogram force and the like; the remaining pressure is actually pressure.
The liquid material is liquid oil, liquefied petroleum gas or chemical in petrochemical industry. The oil product is gasoline, kerosene, diesel oil, naphtha or topped oil. The liquefied petroleum gas is propylene, butane or propane, or a mixture of butane and propane. The chemical product is benzene, methanol or ethanol. The temperature of the liquid material stored in the storage tank 1 is generally 10-40 ℃. When the liquid materials are oil products and chemicals at the joint of the loading pump outlet pipeline 9 and the pressure balance pipeline 15, the pressure is generally 0.05-0.15 MPa; when the liquid material is liquefied petroleum gas, the pressure is generally 0.4-1.2 MPa (the pressure is gauge pressure).
The gas in the gas chamber of the pressure release device 7 of the present invention is generally nitrogen, inert gas or carbon dioxide. Under the working condition of normal loading of the road tank truck or under the working condition of non-pressure relief of the road tank truck after stopping loading, when the liquid material is oil or chemical, the pressure of the gas in the air chamber is generally 0.1-0.4 MPa; when the liquid material is liquefied petroleum gas, the pressure of the gas in the gas chamber is generally 0.5-1.8 MPa (the pressure is gauge pressure). The pressure of the gas in the gas chamber is the pressure of the gas when the volume of the gas chamber is maximum. When the volume of the air chamber is reduced, the pressure of the air is increased, and the air can be calculated according to the state equation of the ideal air. The non-pressure-relief working condition refers to the working condition that the liquid material in the closed pipeline does not enter the liquid material chamber of the pressure relief device 7 for pressure relief due to temperature and pressure rise and volume expansion.
Referring to fig. 1, after the road tank truck is installed under the road tank truck and stopped in loading, after the temperature and pressure of the liquid material in the pipe section of the loading pump outlet pipeline 9 between the outlet of the check valve 13 and the inlet of the numerical control valve 4 are raised and the constant pressure of the safety valve 24 is exceeded, the liquid material is decompressed to the pipe section of the loading pump inlet pipeline 8 between the outlet of the tank root valve 10 and the inlet of the loading pump inlet valve 11 through the safety valve inlet pipeline 25, the safety valve 24 and the safety valve outlet pipeline 26, and then returns to the storage tank 1 through the tank root valve 10. When the pressure of the liquid material in the pipe section of the loading pump outlet pipe 9 between the outlet of the check valve 13 and the inlet of the numerical control valve 4 drops to the back seat pressure of the safety valve 24, the safety valve 24 is closed, stopping the discharge. The constant pressure of the safety valve 24 is generally 1.05-1.15 times of the dead point closing pressure of the loading pump 2, and the back seat pressure of the safety valve 24 is generally 95-97% of the constant pressure of the safety valve 24. The off-dead-point pressure of the loading pump 2 is the maximum pressure of the outlet of the loading pump 2 when the loading pump outlet valve 14 is closed. A safety valve 24, a safety valve inlet pipeline 25, a safety valve outlet pipeline 26 and a valve 23, which belong to a part of a pressure relief device of the under-loading facility of the road tank truck; the pressure relief process using the relief valve 24 is part of the pressure relief method of the road tank truck underslung installation of the present invention. The pressure relief device of the under-loading facility of the highway tank truck comprises a pressure relief device 7, a safety valve 24, a pressure balance pipeline 15, a safety valve inlet pipeline 25, a safety valve outlet pipeline 26 and a valve 23.
The flowmeter 3 used in the invention is a mass flowmeter and is used for measuring the mass flow of liquid materials. When the road tank truck is provided with a pipeline between the storage tank 1 and the dry quick connector 6 of the lower loading crane pipe 5 and the liquid material chamber with the smallest volume are filled with the liquid material for the first time, the flowmeter 3 starts to measure the mass flow of the liquid material. After the last loading operation is finished, the liquid material remained in the pipeline between the outlet of the flowmeter 3 and the dry quick connector 6 of the lower loading arm 5 does not enter the road tank truck of the last loading, but enters the road tank truck of the current loading. After the loading operation is finished, the liquid material remained in the pipeline between the outlet of the flowmeter 3 and the dry quick connector 6 of the lower loading arm 5 does not enter the road tank truck of the loading operation, but enters the road tank truck of the next loading operation.
Claims (2)
1. The application method of the pressure relief device of the road tank truck downloading facility is characterized by comprising the following steps of: the pressure relief device comprises a pressure relief device (7), the pressure relief device (7) is provided with a pressure relief device shell, the inner cavity of the pressure relief device shell is provided with a piston (21), the piston (21) can move along the axial direction of the pressure relief device shell, the inner cavity of the pressure relief device shell is divided into a liquid material chamber and an air chamber by the piston (21), the liquid material chamber is positioned below the air chamber, a pipe section between an outlet of a numerical control valve (4) and an inlet of a lower loading arm (5) of a road tank truck is connected through a pressure balance pipeline (15), the pressure of the liquid material in the liquid material chamber is mainly or completely increased by the pressure balance pipeline (15), after the road tank truck is loaded for stopping loading for the next time, the liquid material in a closed pipeline between the outlet of the numerical control valve (4) and a dry quick connector (6) of the lower loading arm (5) rises in temperature and pressure, the liquid material in the closed pipeline is expanded in volume, the liquid material chamber enters the pressure chamber of the pressure relief device (7) through the pressure balance pipeline (15), the piston (21) mainly or completely moves upwards under the pressure of the liquid material in the liquid material chamber, and the liquid material in the closed pipeline (15) is reduced in volume by the pressure balance pipeline after the liquid material in the closed pipeline (15) and the liquid material in the closed pipeline is reduced in the volume; after the next loading is started by the lower installation of the highway tank truck, the liquid material in the liquid material chamber returns to the pipe section between the outlet of the loading pump (9) and the inlet of the lower loading arm (5) through the pressure balance pipeline (15), the liquid material is liquid oil products, liquefied petroleum gas or chemicals in the petrochemical industry, the gas in the gas chamber is nitrogen, inert gas or carbon dioxide, the oil products are gasoline, kerosene, diesel oil, naphtha or topped oil, the liquefied petroleum gas is propylene, butane or propane, or a mixture of butane and propane, and the chemicals are benzene, methanol or ethanol.
2. The method according to claim 1, characterized in that: under the working condition of normal loading of the road tank truck or under the working condition of non-pressure relief of the road tank truck after stopping loading of the road tank truck, when the liquid material is oil or chemical, the pressure of the gas in the gas chamber is 0.1-0.4 MPa, and when the liquid material is liquefied petroleum gas, the pressure of the gas in the gas chamber is 0.5-1.8 MPa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211082176.7A CN115366776B (en) | 2022-09-06 | 2022-09-06 | Pressure relief device of road tank truck unloading facility and use method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211082176.7A CN115366776B (en) | 2022-09-06 | 2022-09-06 | Pressure relief device of road tank truck unloading facility and use method thereof |
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| CN115366776B true CN115366776B (en) | 2023-11-24 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205133134U (en) * | 2015-11-27 | 2016-04-06 | 天津中德工程设计有限公司 | Highway skid -mounted quantitative loading system that removes theatrical makeup and costume |
| CN212028664U (en) * | 2019-12-16 | 2020-11-27 | 广安职业技术学院 | Hydraulic direct-acting safety valve |
| CN212376650U (en) * | 2020-05-21 | 2021-01-19 | 大庆拓实信息技术有限公司 | Automatic liquid level monitor for drilling and repairing well |
| CN214087701U (en) * | 2020-11-20 | 2021-08-31 | 中国石油化工股份有限公司 | Pressure relief and residual liquid recovery device for oil filling riser joint of liquefied hydrocarbon loading truck |
| CN114151643A (en) * | 2021-12-27 | 2022-03-08 | 青海盐湖海纳化工有限公司 | Liquid hammer eliminator and liquid hammer eliminating method for liquefied gas delivery |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2868338C (en) * | 2014-10-23 | 2016-01-12 | Westport Power Inc. | Gaseous fuel vent handling apparatus and method |
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2022
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205133134U (en) * | 2015-11-27 | 2016-04-06 | 天津中德工程设计有限公司 | Highway skid -mounted quantitative loading system that removes theatrical makeup and costume |
| CN212028664U (en) * | 2019-12-16 | 2020-11-27 | 广安职业技术学院 | Hydraulic direct-acting safety valve |
| CN212376650U (en) * | 2020-05-21 | 2021-01-19 | 大庆拓实信息技术有限公司 | Automatic liquid level monitor for drilling and repairing well |
| CN214087701U (en) * | 2020-11-20 | 2021-08-31 | 中国石油化工股份有限公司 | Pressure relief and residual liquid recovery device for oil filling riser joint of liquefied hydrocarbon loading truck |
| CN114151643A (en) * | 2021-12-27 | 2022-03-08 | 青海盐湖海纳化工有限公司 | Liquid hammer eliminator and liquid hammer eliminating method for liquefied gas delivery |
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