Method for discharging a gas from a gas-conducting line section

Description

[0001] The present invention relates to a method and a system for removing gas from a gas-carrying section of a pipeline.

[0002] Gas pipelines or pipeline sections require periodic maintenance or repair in case of damage. Before such maintenance or repair work, the pipelines or pipeline sections sometimes need to be emptied in a controlled manner. For this purpose, the gas in the pipelines is usually pumped into other pipeline sections. During this pumping process, a point is eventually reached where the pipelines or pipeline sections are only filled with low pressure. However, low pressure within the pipelines eventually leads to the formation of a boundary layer in the outer areas of the gas-carrying pipelines. Depending on the type of gas being conveyed, the formation of this boundary layer poses a particular safety risk due to the potential ingress of atmospheric oxygen into the pipelines. Furthermore, simply venting the residual gas in the pipelines into the atmosphere is only possible with gases that are harmless to health and the environment.Document EP0926428 B1 discloses a method for removing gas from a gas-carrying section of a pipeline.

[0003] It is therefore the object of the present invention to at least partially overcome the aforementioned disadvantages of known systems and methods for removing gas from a gas-carrying section of a pipeline. In particular, it is the object of the present invention to provide a method and a system that each enable the rapid, safe, cost-effective, and environmentally friendly removal of gas from a gas-carrying section of a pipeline.

[0004] The foregoing problem is solved by a method having the features of claim 1 and a system according to claim 7. Further features and details of the invention will become apparent from the dependent claims, the description, and the drawings. Technical features disclosed with respect to the method according to the invention also apply in connection with the system according to the invention, and vice versa, so that the disclosure of the individual aspects of the invention always makes, or can make, a reciprocal reference.

[0005] According to the invention, a method for removing gas from a gas-carrying pipe section is provided. The method according to the invention comprises the steps of transferring a first quantity of gas from the gas-carrying pipe section into a gas reservoir, supplying a purge gas into the gas-carrying pipe section after detecting a residual quantity of gas within the gas-carrying pipe section, and transferring the residual quantity of gas from the gas-carrying pipe section into the gas reservoir, wherein the residual quantity of gas from the gas-carrying pipe section is transferred to the gas reservoir via a separation unit for separation from the supplied purge gas.

[0006] Within the scope of the invention, the term "discharging" a gas from a gas-carrying pipe section can be understood, in particular, as the targeted transfer of a gas from a pipe section into a gas reservoir. A first quantity of gas can preferably be understood as the main part of the gas located in a gas-carrying pipe section, comprising, for example, at least 90%, and in particular at least 95%, of the total weight, total volume, or total pressure of the gas located in the gas-carrying pipe section. The remaining portion of the total weight, total volume, or total pressure can then preferably constitute the remaining quantity of gas. It is further understood that "gas" can be understood, in particular, as a gaseous medium under standard conditions, such as room temperature (25°C) and a pressure of one bar. A gas reservoir can be in the form of a container, for example.The separation unit may be a pressure vessel or an additional section of pipe that can be separated from the section of pipe to be emptied. It is also understood that the transfer of a gas "over" a separation unit can be understood to mean a transfer "through" or along a separation unit.

[0007] Within the scope of the invention, it has been recognized that, based on the steps provided according to the invention—namely, the transfer of an initial quantity of a gas without purge gas and the subsequent transfer of a residual quantity of the gas with purge gas via a separation unit—a rapid, safe, cost-effective, and environmentally friendly discharge of gas from a gas-carrying pipeline section can be ensured. The invention takes into account not only preventing the formation of a boundary layer during the transfer of a gas, but also preventing the release of a potentially harmful and / or environmentally damaging gas into the atmosphere. Furthermore, the invention considers the reuse of the discharged gas and therefore ensures its transfer with the highest possible purity.

[0008] With a view to the rapid and efficient transfer of gas from a gas-carrying pipe section to a gas reservoir, it can advantageously be provided that the initial quantity and / or the remaining quantity of the gas is transferred from the gas-carrying pipe section to the gas reservoir via a compressor unit, wherein the compressor unit is preferably designed in the form of a pump, in particular a Roots pump, piston pump, or diaphragm pump. For example, larger gas volumes can be conveyed quickly and efficiently using Roots pumps.

[0009] In a structurally simple design for the selective transfer of a gas via a separation unit, it is advantageously possible to provide that the residual quantity of gas from the gas-carrying pipe section is separated from the supplied purge gas within a bypass line via a separation unit. The separation unit can preferably be arranged within the bypass line, so that the residual quantity of gas can be controlled in a structurally simple and quick manner by opening and closing appropriate valves. The bypass line can be arranged on the suction side or the pressure side of the compressor unit.

[0010] With regard to a structurally simple and reliable detection of a residual amount of gas from the gas-carrying pipe section, the invention advantageously provides that the detection of a residual amount of gas within the gas-carrying pipe section, from which a purge gas is supplied, is carried out by means of a pressure measurement, wherein the purge gas is preferably supplied from the point at which a critical pressure is detected, wherein the critical pressure is in particular less than 5 bar. The critical pressure can in particular be understood as the total pressure within the gas-carrying pipe section. The purge gas can preferably be supplied via high-pressure tanks and / or introduced into the gas-carrying pipe section via a compressor unit controlled by a valve. Alternatively, in particular if the critical pressure is < 1 bar, a valve to the atmosphere can be opened so that air from the atmosphere can be used as the purge gas.

[0011] As part of a simple and cost-effective solution for removing or discharging the purge gas, it is also conceivable that the purge gas, after separation from the residual gas, is released into the atmosphere, preferably using air as the purge gas. Particularly when handling gases hazardous to health, the environment, or toxic gases, the purge gas can also be in the form of argon or similar inert gases. As chemically inert gases, argon and nitrogen are particularly well-suited as displacement agents for transferring residual gas. When using argon and nitrogen as purge gases, however, the purge gas is preferably not released into the atmosphere but rather collected and stored.

[0012] With a view to a particularly climate-friendly application of the process according to the invention, it can advantageously be provided that the gas to be discharged from the gas-carrying pipe section is a greenhouse gas or contains a greenhouse gas, wherein the gas to be discharged from the gas-carrying pipe section is preferably natural gas or contains natural gas. Natural gas has a high global warming potential depending on its methane content, which can be minimized or preferably eliminated by applying the process according to the invention. Alternatively, the gas to be discharged from the gas-carrying pipe section can also be another hydrocarbon-based fuel gas or be in the form of hydrogen, or be hydrogen.

[0013] Likewise, with a view to the safe and healthy discharge of a gas, it may be provided that the gas to be discharged from the gas-carrying pipe section is or contains a gas that is harmful to health, environmentally harmful and / or toxic, wherein the gas to be discharged from the gas-carrying pipe section is preferably CO, H2S, chlorine gas, CO2 or NH3.

[0014] In accordance with the invention, for the reliable and complete separation of a purge gas from a residual quantity of gas, it can advantageously be provided that the residual quantity of gas from the gas-carrying pipe section is separated from the purge gas by at least one of the following methods: chemical absorption process, adsorption process, distillation process, membrane separation process, cryogenic separation process.

[0015] It is understood that more than one separation process can be used, e.g., sequentially, and in particular in stages. The selection of the appropriate method(s) can preferably be based on the gas and / or on the purge gas.

[0016] To simplify the execution of the method in question and to improve its accuracy, it is also conceivable that the method includes the use of artificial intelligence, wherein preferably at least one detection of a residual quantity of gas within the gas-carrying section of the pipeline is carried out using artificial intelligence. In particular, the detection of a residual quantity of gas within the gas-carrying section of the pipeline can be based on the use of AI.

[0017] With regard to the method according to the invention, it is understood that individual, several, or all mandatory and / or optional steps of the method according to the invention can be carried out in the proposed sequence, but also in a different sequence. In particular, individual, several, or all mandatory and / or optional steps of the method according to the invention can be carried out repeatedly, e.g., cyclically. It is further understood that individual, several, or all of the mandatory and optional steps of the method according to the invention can also be carried out at least partially automatically, in particular by a computer.

[0018] The invention also relates to a system for removing gas from a gas-carrying pipe section, in particular for carrying out a method described above. The system according to the invention comprises a first connection element for connecting to a gas-carrying pipe section, a second connection element for connecting to a gas reservoir, a pipe system arranged between the first and second connection elements for transferring the gas from the gas-carrying pipe section to the reservoir, a measuring unit for detecting a residual quantity of gas within the gas-carrying pipe section, a supply device for introducing a purge gas into the gas-carrying pipe section upon detection of a residual quantity of gas, and a separation unit for separating the residual quantity of gas from the supplied purge gas when transferring the residual quantity of gas from the gas-carrying pipe section to the gas reservoir.The system according to the invention thus has the same advantages as those already described in detail with regard to the method according to the invention.

[0019] In the context of a reliable and complete separation of a purge gas from a residual gas, the separation unit can advantageously comprise a chemical absorption unit and / or an adsorption unit and / or a distillation unit and / or a membrane and / or a cryogenic separation unit, in accordance with the invention. It is understood that more than one separation unit can also be provided, e.g., arranged sequentially, and in particular in stages.

[0020] With a view to the rapid and efficient transfer of gas from a gas-carrying section of pipe to a gas reservoir, it is advantageous to provide a compressor unit for transferring an initial quantity and / or a residual quantity of gas from the gas-carrying section of pipe to the gas reservoir, wherein the compressor unit is preferably in the form of a pump, in particular a Roots pump, piston pump, or diaphragm pump. The use of Roots pumps or Roots piston pumps allows, in particular, larger gas volumes to be conveyed quickly and efficiently.

[0021] In a structurally simple design for the selective transfer of a gas via a separation unit, it is advantageously possible for the separation unit to be arranged within a bypass section, wherein the bypass section preferably has a first and second bypass valve, and wherein the bypass section is preferably arranged on the suction side of the compressor unit. The separation unit or the bypass line may preferably have additional valves through which a residual quantity of gas can be selectively routed in a structurally simple and quick manner. Alternatively, the bypass line may also be arranged on the pressure side of a compressor unit.

[0022] In a structurally simple design for the selective transfer of a gas via a separation unit, it is advantageously also provided that the first and second connection elements have valves for introducing and discharging a gas, wherein the valves are preferably designed as shut-off valves and / or metering valves and / or ball valves and / or flaps. The valves can preferably be electronically and / or magnetically and / or pneumatically controlled, preferably remotely and wirelessly, e.g., from the measuring unit.

[0023] With a view to the targeted and controllable transfer of a gas from a pipe section into a gas reservoir, it can advantageously be further provided that the measuring unit has at least one measuring device for measuring a volume and / or mass flow rate and / or a plurality of sensors for detecting a current pressure and / or a current gas composition, wherein preferably a plurality of sensors are arranged on the suction side and pressure side of a compressor unit. For example, a sensor unit can be arranged on the inlet side and is designed to detect the pressure of the gas within the gas-carrying pipe section in order to determine a residual quantity of gas and thus a time from which a purge gas is supplied based on the pressure measurement. Furthermore, sensors that determine a pressure and / or composition of a gas can be provided downstream of a separation unit, for example.via a mass spectrometric and / or gas chromatographic method. Based on these measurements, and preferably following successful separation, a gas or purge gas can then be discharged into a reservoir or into the atmosphere. If, however, the sensors of the measuring unit detect, for example, that insufficient separation between a purge gas and another gas has yet occurred, the separation process can be repeated.

[0024] Within the framework of a simple and controllable system for introducing a purge gas into a gas-carrying section of pipe, it is advantageously provided that the supply device for introducing the purge gas into the gas-carrying section of pipe is designed in the form of a pressure vessel connectable to the gas-carrying section of pipe, wherein the supply device preferably has a valve for introducing the purge gas into the gas-carrying section of pipe, wherein the valve is particularly capable of being operated automatically. For example, the valve can be coupled to a pressure sensor of the measuring unit and open when a pressure corresponding to a residual quantity of gas is detected, so that a purge process can be initiated automatically.

[0025] With a view to the simple, climate-friendly and safe discharge of a purge gas, it is advantageously provided that at least one drain line for the discharge of a purge gas is included, wherein the drain line has at least one first sensor for detecting the pressure and / or composition of a separated purge gas. In this way, it can be ensured that a purge gas is only discharged at a defined purity level.

[0026] Furthermore, in the context of a simple, cost-efficient and sustainable transfer of gas from a gas-carrying pipeline section, it is conceivable that the gas reservoir is a pressure vessel or a gas-carrying pipeline section.

[0027] In order to ensure versatile applicability of the system in question, it can further be provided according to the invention that the system is mobile, preferably having wheels for rolling, and the system being arranged, for example, on a mobile trailer.

[0028] With a view to creating a mobile device that is as versatile and self-sufficient as possible for the controlled removal of gas from a gas-carrying section of pipeline, it is also conceivable that lighting equipment for illumination and / or a power generator for power supply and / or means for remote site monitoring are provided.

[0029] Further advantages, features, and details of the invention will become apparent from the following description, in which exemplary embodiments of the invention are described in detail with reference to the drawings. The features mentioned in the claims and in the description can each be essential to the invention individually or in any combination.

[0030] They show: Fig. 1 a schematic representation of the individual steps of a method according to the invention for removing a gas from a gas-carrying pipe section, Fig. 2 a schematic representation of a system according to the invention for removing a gas from a gas-carrying pipe section according to a first embodiment at a first time point in time, Fig. 3 a schematic representation of a system according to the invention for removing a gas from a gas-carrying pipe section according to a first embodiment at a second time point in time.

[0031] Fig. 1 Figure 1 shows a schematic representation of the individual steps of a method according to the invention for removing a gas from a gas-carrying pipe section 4.

[0032] As per Fig. 1 As can be seen, the method according to the invention comprises the steps of transferring 100 a first quantity of the gas from the gas-carrying line section 4 into a gas reservoir 8, supplying 200 a purge gas into the gas-carrying line section 4 from the detection of a residual quantity of the gas within the gas-carrying line section 4, and transferring 300 the residual quantity of the gas from the gas-carrying line section 4 into the gas reservoir 8, wherein the residual quantity of the gas from the gas-carrying line section 4 is transferred to the gas reservoir 8 via a separation unit 10 for separation from the supplied purge gas.

[0033] The first quantity and / or the remaining quantity of the gas can be transferred from the gas-carrying line section 4 into the gas reservoir 8 via a compressor unit 6, wherein the compressor unit 6 can preferably be designed in the form of a pump, in particular in the form of a Roots pump, piston pump or diaphragm pump.

[0034] The remaining amount of gas can be separated from the supplied purge gas from the gas-carrying pipe section 4 within a bypass line 24a via a separation unit 10.

[0035] The detection of a residual quantity of gas within the gas-carrying pipe section 4, from which a purge gas is supplied, is preferably carried out by means of a pressure measurement, wherein the purge gas is supplied in particular from the detection of a critical pressure, e.g. from a total or partial pressure of less than 5 bar, in particular of less than 1 bar.

[0036] Air and / or nitrogen can preferably be used as the purge gas, which is then preferably released into the atmosphere after separation from the remaining amount of gas.

[0037] The gas to be discharged from the gas-carrying pipe section 4 can preferably be a greenhouse gas, in particular natural gas, or be formed in the form of hydrogen or be hydrogen itself.

[0038] Alternatively, the gas to be discharged from the gas-carrying pipe section 4 can also be a harmful and / or toxic gas, such as CO, H2S, chlorine gas or NH3.

[0039] The remaining quantity of gas from the gas-carrying pipe section 4 can preferably be separated from the purge gas by at least one of the following methods: chemical absorption process, adsorption process, distillation process, membrane separation process, cryogenic separation process.

[0040] Fig. 2Figure 1 shows a schematic representation of a system 2 according to the invention for removing a gas from a gas-carrying pipe section 4 according to a first embodiment at a first time point in time.

[0041] As per Fig. 2As can be seen, the system 2 comprises a first connection element 12a for connecting to a gas-carrying pipe section 4, a second connection element 12b for connecting to a gas reservoir 8, a pipe system 14 arranged between the first and second connection elements 12a, 12b for transferring the gas from the gas-carrying pipe section 4 into the reservoir 8, a measuring unit 18 for detecting a residual quantity of gas within the gas-carrying pipe section 4, a supply device 16 for supplying a purge gas into the gas-carrying pipe section 4 from the detection of a residual quantity of gas, and a separation unit 10 for separating the residual quantity of gas from the supplied purge gas when transferring the residual quantity of gas from the gas-carrying pipe section 4 into the gas reservoir 8.

[0042] As per Fig. 2As can be seen, system 2 additionally has a compressor unit 6 in the form of a Roots pump for transferring the first quantity and the remaining quantity of gas from the gas-carrying pipe section 4 into the gas reservoir 8.

[0043] The separation unit 10 is arranged within a bypass section 24, which has a first and second bypass valve 24a for separation. The bypass section 24 is arranged on the suction side of the compressor unit 6. It is understood that the bypass section 24 can alternatively also be arranged on the pressure side of the compressor unit 6.

[0044] The separation unit 10 may preferably comprise a chemical absorption unit and / or an adsorption unit and / or a distillation unit and / or a membrane and / or a cryogenic separation unit.

[0045] In the piping system 14, additional valves 20 can optionally be arranged, in particular - as shown - between the bypass section 24 or - as not shown here - at the inlet of the first and second connection element 12a, 12b.

[0046] The valves 20 can preferably be controlled wirelessly, in particular via the measuring unit 18.

[0047] As per Fig. 2 Furthermore, it can be seen that the measuring unit 18 has measuring devices 30 for measuring various volume and / or mass flows as well as a plurality of sensors 28 for detecting a current pressure and / or a current gas composition, which are positioned at different positions of the system 2 and are connected to the measuring unit 18 via control lines 26.

[0048] The supply device 16 for supplying 200 of a purge gas into the gas-carrying line section 4 also has a valve 20 for introducing the purge gas into the gas-carrying line section 4 and can, for example, be designed in the form of a pressure vessel that can be connected to the gas-carrying line section 4.

[0049] Furthermore, two drain lines 22 are provided for draining the purge gas, each of which also has a sensor 28 for detecting a pressure and / or composition of the separated purge gas.

[0050] The gas reservoir 8 can also be designed in the form of a pressure vessel or a gas-carrying pipe section.

[0051] To allow for the most flexible use of the system 2 in question, it can also be provided that the system 2 is mobile, preferably having wheels for rolling and being arranged, for example, on a mobile trailer.

[0052] As per Fig. 2 As shown, the valve 20 arranged between the bypass section 24 is opened and the gas from the gas-carrying line section 4 is conveyed via the compressor unit 6 into the gas reservoir, with the black arrows drawn along the line system 14 indicating the direction of gas flow.

[0053] Fig. 3 Figure 1 shows a schematic representation of the system 2 according to the invention for removing a gas from a gas-carrying pipe section 4 according to a first embodiment at a second time.

[0054] As per Fig. 3As can be seen, at the second point in time, after the measuring unit 18 registers a critical pressure based on the sensor 28 positioned close to the gas-carrying line section 4, the valve 20 located between the bypass section 24 closes. Simultaneously, the bypass valves 24 and the valve 20 on the supply device 16 open, so that from the second point in time onward, a purge gas 200 is supplied into the gas-carrying line section 4, and the remaining gas 300 is transferred together with the purge gas via the bypass section and the separation unit 10 into the gas reservoir 8. The remaining gas from the gas-carrying line section 4 is separated from the purge gas by the separation unit 10 and transferred into the gas reservoir 8.The purge gas separated from the gas, which may preferably be in the form of air, can then be released into the atmosphere via the discharge lines 22 in the form of oxygen and nitrogen. The gas transferred from the gas-carrying pipe section 4 into the gas reservoir 8 may preferably be in the form of natural gas, which can be discharged in pure form in a climate-friendly manner, without causing CO₂ equivalent emissions. The gas may also be in the form of hydrogen, for example.

[0055] By means of the inventive method or system 2 for removing a gas from a gas-carrying pipe section 4, it is therefore possible to ensure a fast, safe, cost-efficient and environmentally friendly removal of a gas from a gas-carrying pipe section. Reference symbol list

[0056] 2 Gas discharge system 4 Gas-carrying pipe section 6 Compressor unit 8 Gas reservoir 10 Separation unit 12a First connection element 12b Second connection element 14 Piping system 16 Feed device 18 Measuring unit 20 Valve 22 Drain line 24 Bypass section 24a Bypass valve 26 Control line 28 Sensor 30 Measuring device 100 Transferring an initial quantity of gas from a gas-carrying pipeline section into a gas reservoir. 200 Introducing a purge gas into the gas-carrying pipeline section. 300 Transferring a remaining quantity of gas from the gas-carrying pipeline section into the gas reservoir.

Claims

1. A method for removing a gas from a gas-carrying pipe section (4), comprising the steps of: - transferring (100) a first quantity of the gas from the gas-carrying pipe section (4) into a gas reservoir (8), - supplying (200) a purge gas into the gas-carrying pipe section (4) upon detection of a residual amount of the gas within the gas-carrying pipe section (4), - transferring (300) the residual amount of the gas from the gas-carrying pipe section (4) into the gas reservoir (8), - wherein the residual amount of gas is transferred from the gas-carrying pipe section (4) to the gas reservoir (8) via a separation unit (10) for separation from the supplied purge gas.

2. The method according to claim 1, characterized in that the first quantity and / or the residual amount of gas is transferred from the gas-carrying pipe section (4) to the gas reservoir (8) via a compressor unit (6), wherein the compressor unit (6) is preferably designed in the form of a pump, in particular in the form of a Roots pump.

3. The method according to claim 1 or 2, characterized in that the residual amount of gas from the gas-carrying pipe section (4) is separated from the supplied purge gas within a bypass line (24a) via a separation unit (10).

4. The method according to any one of the preceding claims, characterized in that a detection of a residual amount of the gas within the gas-carrying pipe section (4), to which a purge gas is supplied, is performed via a pressure measurement, wherein the purge gas is preferably supplied upon detection of a critical pressure, wherein the critical pressure is in particular less than 5 bar, and / or that the purge gas is discharged into the atmosphere after separation from the residual amount of the gas, wherein air and / or nitrogen is preferably used as the purge gas.

5. The method according to any one of the preceding claims, characterized in that the gas to be discharged from the gas-carrying pipe section (4) is a greenhouse gas or contains a greenhouse gas, wherein the gas to be discharged from the gas-carrying pipe section (4) is preferably natural gas or contains natural gas, and / or that the gas to be discharged from the gas-carrying pipe section (4) is a gas harmful to health and / or a toxic gas or contains such a gas, wherein the gas to be discharged from the gas-carrying pipe section (4) is preferably CO, H2S, or chlorine gas or contains such a gas.

6. The method according to any one of the preceding claims, characterized in that the residual amount of gas from the gas-carrying pipe section (4) is separated from the purge gas by at least one of the following methods: - chemical absorption process, - adsorption process, - distillation process, - membrane separation process, - cryogenic separation process.

7. System (2) for removing a gas from a gas-carrying pipe section (4), in particular for carrying out a method according to any one of the preceding claims, comprising: - a first connection element (12a) for connecting to a gas-carrying pipe section (4), - a second connection element (12b) for connecting to a gas reservoir (8), - a piping system (14) arranged between the first and second connection elements (12a, 12b) for transferring the gas from the gas-carrying pipe section (4) into the reservoir (8), - a measuring unit (18) for detecting (200) a residual amount of the gas within the gas-carrying pipe section (4), - a supply device (16) for supplying (200) a purge gas into the gas-carrying pipe section (4) upon detection of a residual amount of the gas, - a separation unit (10) for separating the residual amount of the gas from the supplied purge gas when transferring (300) the residual amount of the gas from the gas-carrying pipe section (4) into the gas reservoir (8).

8. System (2) according to any one of the preceding claims, characterized in that the separation unit (10) comprises a chemical absorption unit and / or an adsorption unit and / or a distillation unit and / or a membrane and / or a cryogenic separation unit.

9. System (2) according to any one of the preceding claims, characterized in that a compressor unit (6) is provided for transferring a first quantity and / or a residual amount of a gas from the gas-carrying pipe section (4) into the gas reservoir (8), wherein the compressor unit (6) is preferably designed in the form of a pump, in particular in the form of a Roots pump.

10. System (2) according to any one of the preceding claims, characterized in that the separation unit (10) is arranged within a bypass section (24), wherein the bypass section (24) preferably comprises a first and second bypass valve (24a), wherein the bypass section (24) is preferably arranged on the suction side of the compressor unit (6).

11. System (2) according to any one of the preceding claims, characterized in that the first and second connection elements (12a, 12b) comprise valves (20) for introducing and discharging a gas, wherein the valves (20) are preferably designed as shutoff valves and / or metering valves and / or ball valves and / or butterfly valves.

12. System (2) according to any one of the preceding claims, characterized in that the measuring unit (18) comprises at least one measuring device (30) for measuring a volume flow and / or mass flow and / or a plurality of sensors (28) for detecting a current pressure and / or a current gas composition, wherein preferably a plurality of sensors (128) are arranged on the suction side and the discharge side of a compressor unit (6).

13. System (2) according to any one of the preceding claims, characterized in that the supply device (16) for supplying (200) a purge gas into the gas-carrying pipe section (4) is designed in the form of a pressure vessel connectable to the gas-carrying pipe section (4), wherein the supply device (16) preferably comprises a valve (20) for introducing the purge gas into the gas-carrying pipe section (4), wherein the valve (20) is, in particular, operable automatically.

14. System (2) according to any one of the preceding claims, characterized in that at least one discharge line (22) is provided for discharging a purge gas, wherein the discharge line (22) comprises at least a first sensor for detecting a pressure and / or a composition of a separated purge gas, and / or that the gas reservoir (8) is a pressure vessel or a gas-carrying pipe section.

15. System (2) according to any one of the preceding claims, characterized in that the system (2) is designed to be mobile, wherein the system (2) preferably comprises wheels for rolling, and / or wherein the system (2) is in particular arranged on a mobile trailer, and / or that lighting means for illumination and / or a power generator for power supply and / or means for remote site monitoring are provided.

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