Gas supply system for testing combustion dummy under flashover condition

Abstract

The utility model relates to the technical field of protective clothing performance testing, and provides a gas supply system for testing a combustion dummy under a flashover condition, which comprises a gas storage device and a gas outlet device which are connected through a main pipeline, the gas outlet device comprises a gas distribution cylinder connected to a gas outlet end of the main pipeline, and the gas distribution cylinder is respectively connected with gas inlet ends of a plurality of first branch pipes; the gas outlet ends of the first branch pipes are connected with the fuel gas outlet adjusting assembly, and buffer gas bottles are arranged on the first branch pipes; the gas storage device comprises a collecting pipe, a nitrogen gas storage tank and a propane gas storage tank, the nitrogen gas storage tank and the propane gas storage tank are connected with the collecting pipe through a pressure regulating pipeline, and the collecting pipe is used for being connected with the gas inlet end of the main pipeline. According to the gas supply system for testing the combustion dummy under the flashover condition, the gas distribution cylinder is connected with the plurality of buffer gas bottles, so that the problems that a large pressure container is complex in examination and approval, high in installation cost and needs annual examination every year are effectively solved, and popularization and application of the gas supply system for testing the combustion dummy under the flashover condition are facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to the protective clothing performance detection technical field, specifically, relate to a kind of gas supply system of combustion dummy test under the condition of flashover. BACKGROUND

[0002] Combustion dummy test system under the condition of flashover is mainly composed of gas supply system, combustion system, dummy system, test system, safety protection system etc., for simulating complex fire situation, test clothing heat protection performance, can effectively evaluate the overall heat protection grade of clothing.Gas supply system is mainly used to provide gas source for combustion system, as one of the core devices of the whole system, the stability of its gas supply determines the reliability of the whole test system and the accuracy of experimental results.According to GB / T23467 standard requirements, the gas source of gas supply system is propane, requires providing uniform at least 84kW / m2 heat flux in at least 5 seconds, and requires pressure stability during combustion, that is, the gas supply pressure during combustion should not decrease more than 10%.

[0003] The existing gas supply system has the following shortcomings: 1, propane gas cylinder gas storage tank of gas supply system and combustion system adopt direct connection mode, by setting the outlet pressure of pressure reducing valve on propane gas storage tank as the working pressure of burner, the whole gas supply system structure is relatively simple, low cost, but when the pressure in gas storage tank is small or under pressure, the pressure fluctuation is obviously more than 10% standard requirement when pipeline is long, cannot reach the stable heat flux required by standard;2, to solve the above problem, the existing gas supply system adds a buffer gas tank between gas storage tank and burner for storing gas, the buffer gas tank can maintain certain flow and outlet pressure for burner while shortening the distance, that is, the pressure fluctuation can be within 10%, but according to the requirements of "Special Equipment Safety Supervision Regulations", large pressure vessels and gas pipelines design, installation need GC2 qualification, approval is complex, construction cycle is long, installation cost is high, and it also needs annual inspection every year, which is not conducive to the popularization and application of combustion dummy test system under the condition of flashover. UTILITY MODEL CONTENTS

[0004] The utility model aims at the problems in the prior art, and provides a kind of gas supply system of combustion dummy test under the condition of flashover, to solve the above problems.

[0005] To achieve the above object, the technical scheme adopted by the utility model is as follows:

[0006] The utility model provides a kind of gas supply system of combustion dummy test under flashover condition, including gas storage device and gas outlet device connected by main pipeline, the gas outlet device includes the gas cylinder connected in the gas outlet end of the main pipeline, the gas cylinder is connected the air inlet end of a plurality of first branch pipes respectively, the air outlet end of a plurality of the first branch pipes is connected gas outlet adjusting assembly respectively, buffer gas cylinder is provided on the first branch pipe;

[0007] The gas storage device includes a busbar, a nitrogen gas storage tank, and a propane gas storage tank. The nitrogen gas storage tank and the propane gas storage tank are connected to the busbar through a pressure regulating pipeline. The busbar is used to connect the air inlet end of the main pipeline.

[0008] Optionally, the gas supply system further comprises a plurality of gas leakage detection devices. Each gas leakage detection device comprises a propane gas sensor, an alarm, and a communication module. The communication module is connected to a user terminal and each electromagnetic valve switch of the gas supply system through communication.

[0009] Optionally, the pressure regulating pipeline comprises a nitrogen pipeline and a propane pipeline. The nitrogen pipeline is connected to the nitrogen gas storage tank, and the propane pipeline is connected to the propane gas storage tank.

[0010] The nitrogen gas storage tank and the propane gas storage tank are arranged in a sealed gas cylinder cabinet. The propane pipeline and the nitrogen pipeline pass through the cabinet body of the gas cylinder cabinet.

[0011] The gas outlet device is arranged in a combustion chamber. The main pipeline passes through the chamber wall of the combustion chamber.

[0012] Optionally, at least three gas leakage detection devices are arranged on the main pipeline, in the gas cylinder cabinet, and at the bottom of the combustion chamber.

[0013] Optionally, the propane pipeline has two branches. The air outlet ends of the two branches of the propane pipeline are connected to the air outlet end of the nitrogen pipeline, and the busbar is connected to the two branches of the second branch pipe.

[0014] Each of the two branches of the second branch pipe is provided with a first pressure regulating table.

[0015] The nitrogen pipeline and the two branches of the propane pipeline are each provided with a switch.

[0016] Optionally, the first branch pipe has two air outlet ends, and each air outlet end of the first branch pipe is provided with an electromagnetic valve.

[0017] The gas outlet adjusting assembly comprises two third sub-pipes connected to two gas outlet ends of the first sub-pipe respectively, and the gas outlet ends of the two third sub-pipes are connected to the gas outlets respectively.

[0018] Optionally, flanges are arranged at two ends of the buffer gas cylinder, and the flanges are used to connect the first sub-pipe.

[0019] Optionally, the gas distribution cylinder is a hollow cylindrical structure, one end face of the gas distribution cylinder is provided with a gas inlet, the gas inlet is used to connect a gas outlet end of the main pipe, and a plurality of gas outlets are uniformly distributed on the peripheral wall of the gas distribution cylinder, and the plurality of gas outlets are connected to the gas inlet ends of the first sub-pipes respectively.

[0020] Optionally, the peripheral wall of the gas distribution cylinder is uniformly provided with six gas outlets, and the volume of the single buffer gas cylinder is 8L.

[0021] The utility model provides a kind of gas supply system of combustion dummy test under the condition of flashover, including gas storage device and gas outlet device connected by main pipe, and gas outlet device includes the gas distribution cylinder connected in the gas outlet end of main pipe, and the gas distribution cylinder is connected to the gas inlet end of a plurality of first sub-pipes respectively, and the gas outlet end of a plurality of first sub-pipes is connected to gas outlet adjusting assembly, and buffer gas cylinder is arranged on the first sub-pipe;Gas storage device includes busbar, nitrogen gas storage tank and propane gas storage tank, and nitrogen gas storage tank and propane gas storage tank are connected to busbar by pressure regulating pipe, and busbar is used to connect the gas inlet end of main pipe.The gas supply system of combustion dummy test under the condition of flashover is connected to multiple buffer gas cylinders by using gas distribution cylinder, effectively avoid the complex approval of large pressure vessel, installation cost is high, and it also needs annual review every year, it is favorable to the popularization and application of combustion dummy test system under the condition of flashover. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0023] Figure 1 The structure diagram of the gas supply system of combustion dummy test under the condition of flashover provided by the embodiments of the present application is shown.

[0024] Figure 2 The structure diagram of the gas storage device is shown.

[0025] Figure 3 The structure diagram of the busbar is shown.

[0026] Figure 4 Fig. 2 is a structural schematic diagram of the manifold;

[0027] Figure 5 Fig. 3 is a structural schematic diagram of the cylinder;

[0028] Figure 6 Fig. 4 is a structural schematic diagram of the cylinder;

[0029] Figure 7 Fig. 5 is a structural schematic diagram of the buffer cylinder;

[0030] Figure 8 Fig. 6 is a structural schematic diagram of the gas outlet adjusting assembly;

[0031] Figure 9 Fig. 7 is a structural schematic diagram of the gas outlet adjusting assembly.

[0032] Fig. 1 is a schematic diagram of the gas cylinder cabinet; Fig. 2 is a structural schematic diagram of the manifold; Fig. 3 is a structural schematic diagram of the cylinder; Fig. 4 is a structural schematic diagram of the cylinder; Fig. 5 is a structural schematic diagram of the buffer cylinder; Fig. 6 is a structural schematic diagram of the gas outlet adjusting assembly; Fig. 7 is a structural schematic diagram of the gas outlet adjusting assembly; Fig. 8 is a structural schematic diagram of the gas leakage detection device. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. It should be noted that the various features in the embodiments of the present application can be combined with each other without conflict, and the combined embodiments are still within the protection scope of the present application.

[0034] The combustion mannequin test system under the flashover condition mainly comprises a gas supply system, a combustion system, a mannequin system, a test system, a safety protection system and the like, is used for simulating a complex fire field condition, testing the heat protection performance of a garment, and can effectively evaluate the heat protection level of the whole garment. The gas supply system is mainly used for providing a gas source for the combustion system, is one of core devices of the whole system, and stability of gas supply of the gas supply system determines reliability of the whole test system and accuracy of experimental results. According to the GB / T23467 standard requirement, the gas source of the gas supply system is propane, it is required to provide a uniform heat flux of at least 84 kW / m2 within at least 5 seconds, and it is required that the pressure is stable during the combustion process, that is, the gas supply pressure during the combustion process cannot decrease by more than 10%. Generally, the gas supply system mainly comprises a propane gas source, a pressure regulating table, a regulating valve, a pressure pipeline, a safety detection device and the like.

[0035] Disadvantages of the prior art: 1. The propane gas cylinder storage tank of the gas supply system is directly connected with the combustion system. The outlet pressure of the pressure reducing valve arranged on the propane storage tank is used as the working pressure of the burner. When this mode is adopted, the whole gas supply system has a relatively simple structure and low cost. When the internal pressure of the storage tank is relatively large and the gas supply pipeline is relatively short, the pressure fluctuation during the combustion period can be basically guaranteed, but the pressure fluctuation in the later combustion period is obvious; when the internal pressure of the storage tank is small or under pressure, the pressure fluctuation is obviously more than 10% when the pipeline is relatively long, and the stable heat flux required by the standard cannot be reached; 2. On the basis of 1, a buffer gas tank is added between the storage tank and the burner, which is used for storing gas. The buffer gas tank can shorten the distance and maintain a certain flow rate and outlet pressure for the burner, so that the pressure fluctuation can be within 10%, but the volume of the buffer tank is 50L. According to the Special Equipment Safety Supervision Regulations, when the highest working pressure is greater than or equal to 0.1MPa (gauge pressure), and the product of the pressure and the volume is greater than or equal to 2.5MPa·L; the pressure pipeline diameter is greater than DN50, the pressure vessel, the gas pipeline design and installation all need GC2 qualification, the approval is complex, the construction period is long, the installation cost is high, and the annual inspection is also required every year, which is not conducive to the popularization and application of the combustion mannequin test system under the flashover condition. To solve the above problems, the embodiment of the present application provides a gas supply system for combustion mannequin test under the flashover condition, which connects multiple buffer gas cylinders through a gas cylinder, meets the stable gas source required by the experiment and ensures the safety of the experiment, and can effectively avoid the management of special pressure vessels.

[0036] As shown in Figure 1 The embodiment of the present application provides a gas supply system for combustion mannequin test under the flashover condition, which comprises a gas storage device and a gas outlet device connected through a main pipeline 3, the gas outlet device comprises a gas cylinder 21 connected to the gas outlet end of the main pipeline 3, the gas cylinder 21 is respectively connected to the gas inlet ends of a plurality of first branch pipelines 22, the gas outlet ends of the plurality of first branch pipelines 22 are respectively connected to a gas outlet adjusting assembly, and the first branch pipelines 22 are provided with buffer gas cylinders 24; as shown inFigure 2 As shown, the gas storage device includes a manifold 13, a nitrogen gas storage tank and a propane gas storage tank, the nitrogen gas storage tank and the propane gas storage tank are connected to the manifold through a pressure regulating pipeline, and the manifold 13 is used to connect the gas inlet end of the main pipeline 3.

[0037] Specifically, the gas supply system is also provided with a plurality of gas leakage detection devices 4, the gas leakage detection device 4 includes a propane gas sensor, an alarm and a communication module, the communication module is respectively connected to the user terminal and each electromagnetic valve switch of the gas supply system through communication. Specifically, in order to ensure the safe and reliable operation of the gas supply system and protect the safety of the experimenters, at least three gas leakage detection devices 4 are provided, which are respectively arranged on the main pipeline 3, in the gas cylinder cabinet 1 and at the bottom of the combustion chamber 2. When gas leakage is detected, the system automatically cuts off the electromagnetic valve and switch in the system, and the alarm reminds the staff, so as to ensure the safe operation.

[0038] Specifically, the pressure regulating pipeline includes a nitrogen pipeline 14 and a propane pipeline, the nitrogen pipeline 14 is used to connect the nitrogen gas storage tank, and the propane pipeline is used to connect the propane gas storage tank; the nitrogen gas storage tank and the propane gas storage tank are arranged in the sealed gas cylinder cabinet 1, the propane pipeline and the nitrogen pipeline 14 pass through the cabinet body of the gas cylinder cabinet 1 respectively; the gas outlet device is arranged in the combustion chamber 2, and the main pipeline 3 passes through the wall of the combustion chamber 2.

[0039] Specifically, the propane pipeline is two-way, as shown in Figure 2 The first propane pipeline 15 and the second propane pipeline 16 are connected to each other at the gas outlet end of the nitrogen pipeline 14, and are connected to the manifold 13 through two second branch pipes 17; the first pressure regulating table 11 is arranged on the two second branch pipes 17 respectively; the switch 12 is arranged on the nitrogen pipeline 14 and the two propane pipelines respectively.

[0040] As shown in Figure 3 And Figure 4 The pressure regulating pipeline is mainly used to regulate the pressure of the gas source outlet, and the second branch pipe 17 is installed to connect the manifold 13, and the second branch pipe 17 is provided with the first pressure regulating table 11. The gas is gathered into the manifold 13 through the two second branch pipes 17, and the middle of the manifold 13 is designed as hollow.

[0041] The propane gas source of the application adopts 2 groups of propane storage tanks in series, and the outlet pressure is set to 0.3-0.6 MPa. The 2 groups of propane storage tanks are placed in the gas cylinder cabinet 1, and the gas cylinder cabinet 1 is provided with a gas leakage detection device 4. The outlet pressure of the gas supply system is set to 0.03-0.1 MPa. The outlet pressure of the gas source is much larger than the outlet pressure of the buffer gas cylinder tank 24, so the gas source can quickly charge the buffer gas cylinder tank 24, ensuring a stable gas source during the test. The gas supply system of the application is provided with a nitrogen gas storage tank, which is used to purge the pipeline with nitrogen. After the experimental combustion test is completed, the nitrogen pipeline 14 can be opened to purge the gas supply pipeline to prevent residual combustible gas in the pipeline. The nitrogen gas storage tank is placed in the gas cylinder cabinet 1.

[0042] Specifically, as shown in Figure 8 and Figure 9 , the first branch pipe 22 has two gas outlets, and the two gas outlets of the first branch pipe 22 are respectively provided with electromagnetic valves 221; the gas outlet adjusting assembly includes two third branch pipes 23 connected to the two gas outlets of the first branch pipe 22, and the gas outlets of the two third branch pipes 23 are respectively connected to the gas outlets; the third branch pipe 23 is respectively provided with a pressure regulating valve 231 and a second pressure regulating table 232.

[0043] Specifically, as shown in Figure 7 , the two ends of the buffer gas cylinder tank 24 are provided with flanges 241, which are used to connect the first branch pipe 22.

[0044] Specifically, as shown in Figure 5 and Figure 6 , the gas distribution cylinder 21 is a hollow cylindrical structure, one end face of the gas distribution cylinder 21 is provided with a gas inlet 211 for connecting the gas outlet of the main pipeline 3, and the peripheral wall of the gas distribution cylinder 21 is uniformly distributed with a plurality of gas outlets 212, and the plurality of gas outlets 212 are respectively connected to the gas inlets of the first branch pipes 22.

[0045] Specifically, the peripheral wall of the gas distribution cylinder 21 is uniformly distributed with 6 gas outlets 212, and the volume of a single buffer gas cylinder tank 24 is 8L. The gas distribution cylinder 21 is used to divide the gas in the gas source into six paths and connect them to the six small buffer gas cylinder tanks 24. The gas distribution cylinder 21 is made of 201 stainless steel, and the side surface is uniformly distributed with 6 small holes, which are communicated with the large hole at the top.

[0046] In the embodiments of the present application, the buffer gas tank is used for storing gas. It is calculated that the gas consumption is about 30-35L for one test experiment, and in order to ensure the stability of the pressure, the volume of the buffer gas tank is determined to be 48L, which is equally divided into 6 gas cylinder tanks, each of which is 8L. It is tested that this capacity can ensure that the gas pressure fluctuation in the pipeline during combustion is less than 10%. According to the pressure vessel standard of the “Special Equipment Safety Supervision Regulations”, the maximum working pressure is greater than or equal to 0.1MPa (gauge pressure), and the product of the pressure and the volume is greater than or equal to 2.5MPa·L; the diameter of the pressure pipeline is greater than DN50. Therefore, the 48L buffer gas tank is equally divided into 6 small buffer gas cylinder tanks 24, each of which is 8L, the outlet pressure of the burner is set below 0.03MPa (gauge pressure), and the design pressure is less than 0.3MPa, the product of the two is 2.4MPa·L (0.3*8=2.4), and the diameter of the main pipeline 3 is DN40. Therefore, the buffer gas cylinder tank 24 and the gas supply pipeline in the gas supply system do not belong to the management scope of the special pressure pipeline, and the gas supply system is managed and supervised by the safety management department of the enterprise, and the maintenance and repair work is done in peacetime. The outer diameter of the buffer gas cylinder tank 24 is 114mm, the inner diameter is 108mm, the length is 828mm, and the flanges 241 are designed at both ends to facilitate connection with the pipeline.

[0047] The working process of the gas supply system for the bum test of the mannequin under the flashover condition provided by the embodiments of the present application is as follows: system starting stage: open the valve of the propane gas storage tank, so that the gas source is in standby state, ensure that the gas leakage detection device is normally operated, check the sealing property of each connection, and after confirming that there is no leakage, the system is ready; gas supply stage: the propane gas storage tank delivers gas to the manifold 13 through the pressure regulating pipeline, and the gas enters the main pipeline 3 through the manifold 13. At the manifold 13, the gas pressure is adjusted by the first pressure regulating table 11 to ensure that the gas pressure entering the main pipeline 3 is stable. The main pipeline 3 delivers the gas to the gas distribution cylinder 21, and the gas distribution cylinder 21 divides the gas into six paths and enters the first branch pipe 22 respectively. The gas enters the buffer gas cylinder tank 24 through the first branch pipe 22. The outlet pressure of the propane gas storage tank is higher than that of the buffer gas cylinder tank 24, which can quickly charge and ensure stable gas source. The gas from the buffer gas cylinder tank 24 passes through the gas outlet adjusting assembly, adjusts the gas pressure to the pressure required by the burner through the pressure regulating valve 231 and the second pressure regulating table 232, and then is delivered to the burner; gas supply end stage: after the combustion test is completed, the valve of the propane gas storage tank is closed, the gas source is cut off, the nitrogen pipeline is opened, the combustible gas in the pipeline is removed by using nitrogen to prevent safety accidents caused by residual gas, all solenoid valves and switches are closed, and the system is restored to the initial state, ready for the next test.

[0048] The above merely provides preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A gas supply system for a flashover condition combustion manikin test, comprising a gas storage device and a gas outlet device connected by a main pipe (3), characterized in that: the gas outlet device comprises a gas distribution cylinder (21) connected to the gas outlet end of the main pipe (3), the gas distribution cylinder (21) is connected to the gas inlet ends of a plurality of first branch pipes (22), the gas outlet ends of the plurality of first branch pipes (22) are respectively connected to gas outlet adjusting assemblies, and a buffer gas cylinder (24) is arranged on the first branch pipe (22); the gas storage device comprises a bus pipe (13), a nitrogen gas storage tank and a propane gas storage tank, the nitrogen gas storage tank and the propane gas storage tank are connected to the bus pipe through a pressure regulating pipe, and the bus pipe (13) is used to connect the gas inlet end of the main pipe (3).

2. The gas delivery system for use in a flash fire condition burn dummy test according to claim 1, characterized in that, A plurality of gas leakage detection devices (4) are arranged in the gas supply system, the gas leakage detection device (4) comprises a propane gas sensor, an alarm and a communication module, the communication module is respectively connected to a user terminal and each electromagnetic valve switch of the gas supply system through communication.

3. The gas supply system for a flash fire condition burning manikin test of claim 2, wherein, The pressure regulating pipe comprises a nitrogen pipe (14) and a propane pipe, the nitrogen pipe (14) is used to connect the nitrogen gas storage tank, and the propane pipe is used to connect the propane gas storage tank; the nitrogen gas storage tank and the propane gas storage tank are arranged in a sealed gas cylinder cabinet (1), the propane pipe and the nitrogen pipe (14) pass through the cabinet body of the gas cylinder cabinet (1) respectively; the gas outlet device is arranged in a combustion chamber (2), and the main pipe (3) passes through the wall of the combustion chamber (2).

4. The gas supply system for a flash fire condition burning manikin test of claim 3, wherein, At least three gas leakage detection devices (4) are arranged on the main pipe (3), in the gas cylinder cabinet (1) and at the bottom of the combustion chamber (2) respectively.

5. The gas delivery system for use in a flash fire condition test of a burn dummy according to claim 3, characterized in that The propane pipe is two-way, the gas outlet ends of the two-way propane pipe and the gas outlet end of the nitrogen pipe (14) are connected to each other, and the bus pipe (13) is connected through two-way second branch pipes (17); first pressure regulating tables (11) are arranged on the two-way second branch pipes (17) respectively; switches (12) are arranged on the nitrogen pipe (14) and the two-way propane pipes respectively.

6. The gas delivery system for use in a flash fire condition test of a burn dummy according to claim 1, characterized in that The first branch pipe (22) has two gas outlet ends, and the two gas outlet ends of the first branch pipe (22) are respectively provided with electromagnetic valves (221); the gas outlet adjusting assembly comprises two-way third branch pipes (23) connected to the two gas outlet ends of the first branch pipe (22), the gas outlet ends of the two-way third branch pipes (23) are respectively connected to gas outlets, and pressure regulating valves (231) and second pressure regulating tables (232) are arranged on the third branch pipes (23) respectively.

7. The gas delivery system for use in a flash fire condition test of a burn dummy according to claim 1, characterized in that Flanges (241) are arranged at both ends of the buffer gas cylinder (24), and the flanges (241) are used to connect the first branch pipe (22).

8. The gas delivery system for use in a flash fire condition test of a burn dummy according to claim 1, characterized in that The gas distribution cylinder (21) is a hollow cylindrical structure, one end face of the gas distribution cylinder (21) is provided with an air inlet (211), the air inlet (211) is used for connecting the air outlet end of the main pipeline (3), the peripheral wall of the gas distribution cylinder (21) is uniformly distributed with a plurality of air outlets (212), and a plurality of air outlets (212) are respectively connected with the air inlet ends of the first branch pipes (22).

9. The gas supply system for a flash fire condition burning manikin test of claim 8, wherein, The peripheral wall of the gas distribution cylinder (21) is uniformly distributed with 6 air outlets (212), and the volume of a single buffer gas cylinder (24) is 8L.

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