• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
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    • 专利摘要:
    A method of shutting off an end-user line connected to a main natural gas line, the method comprising: introducing a blocking means (3) in the upstream direction into the end-user line, which is arranged to substantially block a flow of natural gas through the end-user line after introduction ; and permanently closing the end user line downstream of the inserted blocking means, thereby enclosing the inserted blocking means in the end user line. Furthermore, there is provided a system for uninterrupted distribution of natural gas to an end user line, a blocking means, an insertion device, a building and a method for modifying a building.
    公开号:NL2023727A
    申请号:NL2023727
    申请日:2019-08-29
    公开日:2021-02-01
    发明作者:Wilhelmus Roelofs Theodorus
    申请人:Alliander N V；
    IPC主号:
    专利说明:

    P123749EN10 Title: Method for shutting off an end user gas pipe as well as a natural gas distribution system The invention relates to a method for shutting off an end user pipe that is connected to a main natural gas pipe.
    Natural gas is usually distributed via pipelines to end users, for example homes or commercial spaces, for example for heating rooms and / or tap water and / or for use in a gas stove or gas oven. Sometimes end users want or have to be permanently cut off from natural gas, for example because of a preference for alternative, for example more sustainable energy sources, or because of concerns about the safety of the use of natural gas or because of an increasing price of natural gas.
    When shutting off an end user, one or more local facilities, for example a gas tap and / or a gas meter, often have to be disconnected from the end user pipeline. In addition, sometimes a portion of the end user line has to be removed or shortened. This is done, for example, in connection with safety, to limit the risk of leakage from the end-user pipeline after closure, and / or for example to free up space and / or to be able to reuse or recycle a facility, such as a meter.
    In certain cases, the disconnection must be done for each individual end user, while other end users, who are supplied with natural gas via the same main natural gas pipeline, for example, cannot, may not or do not want to be disconnected. For these other end users it is actually desirable that they can continue to use natural gas uninterruptedly, as they are used to, while the gas is cut off at the end user to be disconnected. However, especially in high-rise buildings, it often happens that several end users are connected to the gas via one common main natural gas pipeline of the building that branches off to individual end-user pipes. For example, it may happen that one end-user in the building has to be disconnected from the gas. The common main natural gas line may have, for example, a main shut-off valve located in a difficult-to-reach location, for example underground.
    Because natural gas is volatile and highly flammable, shutting down an end user entails significant safety risks, especially the risk of a gas fire. This applies in the first place during the work for closing, where gas can escape from open pipes and where, for example, sparks can be created by sawing pipes. Second, it applies after shutdown, where gas may leak due to an incomplete shutoff or damage occurring later. Thus, it is important that the shut-off work is done both quickly, i.e. with minimal escape of natural gas during the job, and good, i.e. with minimal risk of gas leakage after the shut-off. These two requirements can be contradictory: after all, applying a solid fence requires attention and care and therefore time.
    Various solution directions are known from practice, each of which has at least one drawback. For example, it is known to close off the common main natural gas pipeline during the closing work, with the drawback that the gas supply to other end users is interrupted. Closing a main line can moreover be costly and disruptive, for instance when excavation work is required for this, which usually requires extra manpower.
    It is also known to perform the closing activities quickly, preferably as quickly as possible, in order to thus limit the escape of gas during the activities. This has the disadvantages that in general an undesirable amount of gas escapes during the work, and that the work may not be carried out properly due to the rush, as a result of which an unsafe situation can arise after the closure, for example if an end stop is not properly carried out in the rush. attached to the end user line. In addition, sparks can easily form during the work which can ignite gas, for example when cutting a pipe. It is therefore generally required by law to carry out work without gas (i.e. such that no gas can escape during the work).
    The object of the invention is to at least partially solve at least one of the above problems and disadvantages. In particular, it is an object of the invention to provide a solution for shutting off an end user gas line connected to a main natural gas line, wherein shutting off can be done in a safe and efficient manner without disrupting the gas supply to other end user lines.
    To this end, the invention provides a method according to the features of claim 1. The method comprises: introducing a blocking means in the upstream direction in the end user line, which blocking means is adapted to substantially block a flow of natural gas through the end user line after introduction; and permanently occluding the end user line downstream of the inserted blocking means, thereby enclosing the inserted blocking means in the end user line.
    The insertion of the blocking means makes it possible to substantially block an outflow of natural gas in a quick, safe and efficient manner, so that the other shut-off operations, including the permanent closing of the end-user pipeline, can be performed in a safe and careful manner, this all without interruption of the gas supply to other end user lines (which are connected to the same main line) and without requiring work aimed at the main natural gas line, for example on a main shut-off valve thereof. By enclosing the inserted blocking means or leaving it behind in the end user line, the blocking means can (substantially) block the outflow of gas up to and including the end of the closing activities. Furthermore, certain legislation (if in force) can be complied with. In addition, the inserted blocking means can provide a redundant closure of the end-user line after the work, in particular after permanent shutdown, with which safety is further increased. Note that the blocking means can preferably still allow a relatively small leakage current to pass through after insertion, for instance to check whether a next step (i.e. permanent sealing) has been carried out correctly.
    Permanently occluding the end user line (also called capping) downstream of the inserted blocking means may include providing an end plug to the end user line downstream of the inserted blocking means.
    Applying such an end plug is an efficient and robust way of closing off the end user line. Since the inserted blocking means substantially blocks the flow of natural gas, the end stop can be fitted in a careful and safe manner. The emdstop can be designed in different ways.
    The method may further include opening a controllable end user valve, e.g., a valve or a tap, from the end user line, introducing the blocking means through the opened controllable valve. The blocking means can be designed such that the gas is forced back upstream through the end-user valve, towards the main line.
    Opening such an adjustable end-user valve, which is often already provided in or on the end-user line, provides access in a safe and quick way for insertion of the blocking agent, and preferably before the relevant end-user line is capped. The time between the opening of the end-user pipeline and the blocking of the natural gas flow through the pipeline can thus be very short, so that the amount of natural gas discharged can be kept to a minimum.
    The method preferably further comprises removing the controllable valve after insertion of the blocking means.
    Removing the controllable shut-off valve further reduces the risk of leakage after shut-off. In addition, the controllable valve can in this way be reused or otherwise used and space can be freed up previously occupied by the controllable valve.
    Introducing the blocking means may include: connecting the blocking means to an introducer; introducing the introducer at least partially into the end user line with the blocking means (e.g., via a said valve), inserting the blocking means substantially completely into the end user line; and releasing the insertion device from the blocking means. In this way, the insertion of the blocking means can be performed well and easily, the blocking means being particularly easily displaced upstream through the end user conduit (and optional controllable valve), for example up to a Preferred Position.
    The method preferably further comprises removing the introducer from the end user conduit.
    The insertion device can be reused in this way, thereby saving costs. Moreover, this reduces the chance that the insertion device can disturb further activities.
    Introducing the blocking means upstream into the end user line may include moving the blocking means upstream through the end user line to, for example, beyond a target gas blocking position.
    For example, the target gas blocking position may be a position upstream of a target cutting position where the end user line is cut after insertion of the blocking means. In this way it is made possible to block the flow of gas from an intended gas blocking position, with which further work can be performed more safely and / or more efficiently.
    The end user line can be a branch of the main natural gas line, where an overpressure in the main natural gas line can be, for example, between 30 and 200 mbar, in particular approximately 100 mbar.
    The process according to the invention is particularly advantageous under these conditions.
    The invention further provides a system for uninterrupted distribution of natural gas to a first end-user line which is located downstream of a pressurized main natural gas line, for example a system obtained using a method as described above, wherein a second end-user line is provided which is also downstream of the main natural gas line, the second end user line being closed by an internal blocking means and an end stop.
    Such a system can offer the advantages described above.
    The blocking means may be arranged to be displaceable in the upstream direction in the end user line and to oppose displacement in the downstream direction.
    This makes it possible to bring the blocking means upstream 1n, for example to an intended blocking point,
    while displacement or removal of the blocking means in a downstream direction, for example by a gas overpressure, is counteracted. This further enhances safety and efficiency.
    The blocking means may be moved to a gas blocking position in the end user line via an open controllable end user valve, for example a valve or a tap.
    This configuration offers the aforementioned advantages and in particular offers an efficient and safe closure of the end user line at the gas blocking position.
    The first and second end user lines can each be a branch of the main natural gas line, an overpressure in the main natural gas line being between 30 and 200 mbar, in particular about 100 mbar.
    The system according to the invention is particularly advantageous under these circumstances.
    The invention further provides a blocking means of a system as described above, wherein the blocking means is arranged to be introduced in an upstream direction into an overpressure gas end user line, and after introduction to substantially reduce a flow of pressurized natural gas through the end user line. to block.
    This blocking agent can provide the above mentioned advantages.
    The invention further provides an introducer for inserting an above-described blocking means into an end-user line of an above-described system, the introducing device being connectable to the blocking means, the so-connected introducing device being insertable at least partially into the end-user line, the connected introducing device being is releasable from a blocking means inserted into the end user line.
    Such an insertion device provides a means of properly and easily inserting the blocking means, the blocking means being particularly easy to move upstream through the end user line (and optional controllable valve), for example, to a desired position. After detachment, the introducer can be removed and reused, saving costs. In addition, loosening and removal reduces the chance that the insertion device can interfere with further operations.
    The invention further provides a building, for example an apartment complex and / or high-rise building, wherein the building is characterized in that it comprises a system described above, having at least one gas main line coupled via a plurality of branches to respective end user lines, at least one of the emd user lines is closed by an internal blocking means as well as an end stop.
    Thus, the above advantages can be obtained.
    The invention further provides a method for adapting a building, for example an apartment complex and / or high-rise building, wherein the building is provided with at least one natural gas main pipe under gas overpressure which is branched off via a number of branches to respective end user pipes, wherein at least a number of of the end user lines are provided with a controllable end user valve, a method described above for terminating an end user line is used to close at least one of the end user lines and in particular to remove a respective controllable end user valve from the end user line.
    In this way the above mentioned benefits can be achieved.
    An example of the invention is further elucidated on the basis of drawings and embodiments. In the drawings: FIG. 1a an example of a gas distribution system including a main natural gas line and end user lines; FIG. 1b shows a white initial situation in an example of a method for closing an end-user line of the device shown in FIG. 1a system shown; FIG. 1c a first step, in which a blocking means is introduced with an insertion device via an adjustable valve into an end-user line to be disconnected; FIG. 1d a second step in which the introducer is removed from the end user line after insertion of the blocking agent; FIG. le a third step, in which the controllable valve has been removed and the end user line shortened; FIG. 1f the system in a building, in which the end user line downstream of the inserted blocking means is permanently closed by an provided end plug; FIG. 2a is a cross-section of an exemplary embodiment of a blocking means with an insertion device connected thereto; FIG. 2b is a section of the blocking means introduced into an end user line; FIG. 2c a cross section of an insertion device; and FIG. 2d is a section of the blocking means which is moved with an insertion device in upstream direction through a controllable valve.
    The drawings are schematic and are for illustrative purposes only. In the drawings, identical or corresponding elements are indicated by identical or corresponding reference signs.
    FIG. 1a shows an example of a system in which end user lines 1, 1 ', 1 "are connected to a main natural gas line
    2. Natural gas can flow in the system via the main pipe 2 to and through the end user pipes 1, 1 ', 1 "in a flow direction F. The system can, for example, form part of a building (see Fig. 1f).
    It will be clear that by the direction of flow F is meant a direction that is representative of a natural gas displacement through the relevant lines during normal end-user gas use. Even if a flow velocity of the natural gas is substantially zero, for example after a respective pipe has been closed, the flow direction F thus defined is maintained as a direction, whereby terms derived from it such as downstream and upstream also retain their meaning.
    Each end-user line 1 is, for example, a branch of the main natural gas line 2, wherein an overpressure in the main natural gas line is, for example, between 30 and 200 mbar, in particular approximately 100 mbar. It will be clear that the overpressure is measured with respect to an ambient air pressure of the main natural gas line, in particular an atmospheric pressure. It will moreover be clear that the overpressure in the main natural gas line can be a somewhat variable overpressure, wherein the overpressure can vary, for example, within the range of 30 to 200 mbar.
    The main line 2 is, for example, provided with a main shut-off valve 12 which is located, for example, underground. If the main valve 12 is closed, the natural gas distribution to all end user lines 1, 1 ', 1 "located downstream of the main valve 12 will cease, which may be undesirable.
    An end user line 1, for example each of the end user lines 1, 1 ', 1 ", is provided, for example, with an adjustable EMD user valve 5, for example a valve or a tap, for example a gas tap. An end user line 1 may further be provided, for example, with a gas meter 8 which 1s adapted to measure a gas consumption of the end user, for instance downstream of the adjustable end-user valve 5. When permanently closing an end-user line 1, it may be desirable to remove the end-user valve 5 and / or the gas meter 8, for example.
    FIG. 1b shows a starting situation in which an end user line 1 of the system as shown in FIG. 1a is prepared for permanent shutdown. FIG. 1c-1f show further steps of the method.
    This method relates to a method of shutting off the end user line 1 connected to the main natural gas line 2, the method comprising: introducing in the upstream direction into the end user line 1 a blocking means 3 adapted to post-initiate a flow of natural gas through the end user line 1 substantially block; and permanently closing the emd user line 1 downstream of the inserted blocking means 3, thereby enclosing the inserted blocking means 3 in the end user line 1.
    In the baseline situation as shown in Fig. 1b, the adjustable valve 5 is first closed, after which parts downstream of the valve 5, for example the gas meter 8, have been removed. Closing the controllable valve 5 can prevent gas from leaking out during the disassembly of the parts located downstream of the valve 5.
    According to the exemplary embodiment, the method may further comprise: opening a controllable end-user valve 5, for example a valve or a tap, from the end-user line 1, wherein the blocking means 3 is introduced into the end-user line 1 via the opened controllable valve 5 (see Fig. 1c). ), the method preferably further comprising removing the controllable valve 5 after insertion of the blocking means 3 (see Fig. 1d). In the example, the blocking means 3 is arranged to be moved upstream through the opened controllable end user valve 5 so as to be inserted into the end user line 1.
    For example, the valve 5 may have a smaller inner diameter than the end user conduit 1 (see Fig. 2d), or substantially the same inner diameter, for example, the blocking means 5 being adapted to deform under the pressure of insertion into the valve 5 and then after passing through of the valve 5 at least partially elastically. Such an elastic deformability of the blocking means 3 can moreover enable a substantially gastight blockage in the end user conduit 1 and it can prevent displacement, for example by gas overpressure, of the blocking means 3 in downstream direction F through the end user conduit 1 by clamping against and / or or to cause friction with the end-user line 1. The blocking means 3 may for this purpose comprise one or more elastically deformable shell elements 9 (see Fig. 2b and 2d). FIG. 2d shows how the tray elements 9 deform within the controllable valve 5 which has a smaller diameter than the emd user line 1. Such elastic tray elements 9 may be made, for example, of rubber and / or other suitable elastic material, as will be apparent to those skilled in the art.
    The blocking means 3 can in itself be designed in various ways, which will be clear to the skilled person. Figures 2a, 2b, 2c, 2d show a non-limiting white lining example thereof. Other possible examples are well known in the art, see for example (but not limited to) gas tube blocking means corresponding to configurations described in US5228476 and GB928969. Known blocking means, however, are arranged in a gas pipe to be blocked for a relatively short time for the purpose of temporarily blocking the gas flow, in contrast to the method according to the present invention (wherein the blocking means 3 for a relatively long time, for example at least a week, at least a month or at least one or more years, in particular during a service life of and / or installation period of the relevant part of the gas distribution system, is located in the relevant end-user pipe 1).
    Various known blocking means are moreover designed for hermetically, gastightly blocking a gas pipe. However, according to an additional advantageous aspect of the present invention, the blocking means 3 is arranged to effect a substantial gas flow block but not a complete one. In particular, the blocking means 3 is designed to allow a gas leakage flow through (in particular at or under the influence of an above-mentioned overpressure), and for this purpose it can for instance be provided with a gas passage (for instance a relatively small passage, a gas-permeable wall part or of such). According to a further elaboration, the blocking means can, for instance, be wholly or partly manufactured from a gas-permeable material, such that the blocking means can pass a relatively small leakage current at a specific gas pressure difference thereover (i.e.
    mentioned overpressure). A suitable gas leakage flow (measured at a stated overpressure) can for instance have a maximum flow rate of 10 liters / hour, preferably 5 liters / hour, wherein the leakage flow is preferably at least 0.1 liters / hour and in particular at least at least 0.1 liters / hour. at least 1 liter per hour.
    According to the exemplary embodiment, the insertion of the blocking means 3 may comprise: connecting the blocking means 3 to an insertion device 6 (see Fig. 1b and 2a); at least partially inserting the insertion device 6 into the end user line 1 with the blocking means 3, inserting the blocking means 3 substantially completely into the end user line 1 (see Fig. 1c); and detaching the insertion device 6 from the blocking means 3, the method preferably further comprising: removing the insertion device 6 from the end user conduit 1 (see Fig. 1d).
    For example, the introducer 6 is a rod with a diameter smaller than a smallest expected inner diameter of elements to be pierced such as an end-user conduit 1 and / or a controllable valve 5. In some examples, the introducer 6 may be bendable to pass through a bend in a end-user line. The introducer 6 has a length that is preferably greater than a distance over which the blocking means is to be moved through an end user conduit 1 and / or a valve 5.
    For the blocking means 3 and the insertion device 6 to be connectable and detachable, the blocking means comprises, for example, an insertion pin 10 and the insertion device comprises, for example, an insertion cavity 11 (see Fig. 2a, 2c), or vice-versa. For example, the insert pin 10 and insert cavity 11 are both threaded so that the pin 10 can be screwed into the cavity 11 and so that the insertion device can be released from the locking means by a screwing movement of the insertion device, whereby a compliant screw movement of the locking means 3, for example is resisted by friction of the blocking means 3 with a receiving end-user line 1.
    According to the exemplary embodiment, the insertion of the blocking means 3 in the upstream direction into the end user line 1 may comprise: moving the blocking means 3 upstream through the end user line 1 to, for example, beyond an intended gas blocking position 7 (see Fig. 1d).
    The intended gas blocking position 7 is, for example, upstream of an intended cutting position 15, at which position the end user line 1 is, for example, sawn through. For example, a user can determine whether the blocking means 3 has reached the gas blocking position 7 on the basis of a known length of the insertion device 6, for example on the basis of a mark on the insertion device 6. Alternatively, for example, the actual position of the blocking means 3 can be determined. can be used, for example, by using the insertion device 6 as a distance meter while the insertion device 6 is still connected to the inserted blocking means 3, after which a user can determine, for example, a suitable cutting position 15 on the basis of the measured distance.
    Shutting off the end user line 1 downstream of the inserted blocking means 3 may comprise fitting an end plug 4 on the end user line 1 downstream of the inserted blocking means 3 (see Fig. 1f).
    The fitting of the end plug 4 (also referred to as capping) can take place in various ways, which are known as such to the skilled person. Because the blocking means 3 substantially blocks the outflow of gas during the fitting of the end stop 4, the end stop can be fitted in a careful and thorough manner without it being almost necessary to limit the outflow of gas.
    Alternatively, closing the end user line 1 downstream of the inserted blocking means 3 may comprise, for example, filling up, for example with a filler, and / or squeezing the end user line 1 downstream of the blocking means 3.
    FIG. 1f further shows a possible end situation of the exemplary embodiment of the method, in which an end-user line 1 is permanently closed (i.e. hermetically, gastight) and in which the blocking means is enclosed in the end-user line 1. In the example shown, other end-user lines 1 ', 1 "can be continuously supplied with gas supply both during and after the shutdown operations. It will be clear that the other end-user lines 1', 1" can each be individually shut off from the gas in an analogous manner according to the method described above.
    As mentioned, the introduced blocking means 3 preferably allows a relatively small gas leakage current to pass through. This makes it possible to check whether the end stop 4 has been correctly fitted. After all, with an incorrectly fitted end stop 4, said leakage current can also pass such an end stop, which is detectable. On the other hand, such a blocking means 3 offers sufficient safety for the fitter, by substantially (but not completely) blocking gas flow.
    More generally, Fig. 1f an exemplary embodiment of a system 13 for uninterrupted distribution of natural gas to a first end-user line 1 'which is located downstream of a pressurized main natural gas line 2, for example a system 13 obtained using a method described above, wherein a second end-user line 1 is provided which is also located downstream of the main natural gas line 2, the second end user line 1 being substantially closed off by an internal blocking means 3 and an end stop 4.
    The first and second end-user lines 1 ', 1 can each be, for instance, a branch of the main natural gas line 2, an overpressure in the main natural gas line 2 being, for instance, between 30 and 200 mbar, in particular approximately 100 mbar.
    According to an exemplary embodiment, the blocking means 3 is adapted to be introduced in an upstream direction in a gas-overpressurized end-user line 1, and to substantially block a flow of under-pressure natural gas through the end-user line 1 after insertion (preferably to pass a said leakage current).
    According to the exemplary embodiment, the blocking means 3 can be arranged to be displaceable in the upstream direction in the end-user line 1 and to counteract displacement in downstream direction F, in particular by a gas overpressure from the main gas line 2. To this end, the blocking means 3 is preferably arranged such that, after insertion, it can engage the end user line 1 at least in downstream direction F, for instance via friction and / or clamping force, while it remains substantially displaceable in upstream direction through the end user line. In other words, the inserted blocking means 3 in cooperation with the end user line in the downstream direction F causes a greater displacement resistance than in the upstream direction.
    Preferably, the blocking means 3 is substantially manufactured from one or more relatively inexpensive materials, so that the cost price of the blocking means can be low. This has the advantage that the blocking means 3 can be enclosed and left behind in the end user line 1 without great loss of cost.
    The blocking means 3 has, for instance, been moved to a gas blocking position 7 in the end-user line 1 via an open controllable end-user valve 5, for instance a valve or a tap.
    According to an exemplary embodiment, an insertion device 6 is provided for inserting a blocking means 3 into an end user line 1, the insertion device 6 being connectable to the blocking means 3, the thus connected introducing device 6 being at least partially insertable into the end user line 1, the connected introducer 6 is detachable from a blocking means 3 inserted into the end user conduit 1.
    The exemplary embodiments shown can for instance find application in a building, for instance an apartment complex and / or high-rise building, wherein the building 14 (see Fig. 1f) is characterized in that it comprises a system 13 with at least one gas main line 2 which via a number of branches to respective end-user lines 1, 1 ', 1 "1s coupled, with at least one of the end user lines 1, 1', 1" 1s closed by an internal blocking means 3 as well as an end stop 4.
    The application in a building comprises, for example, a method for adapting a building, for example an apartment complex and / or high-rise, wherein the building 14 is provided with at least one natural gas main pipe 2 under gas overpressure, which is branched off via a number of branches to respective end-user pipes 1 , 1 ', 1 ", wherein at least some of the end user lines 1, 1', 1" are provided with a controllable end user valve 5, a method described above for closing an end user line is used to close at least one of the end user lines 1, 1 ', 1 "and in particular to remove a respective controllable end user valve 5 from the end user line 1.
    Thus, the invention provides a solution for shutting off an end user line connected to a main natural gas line, whereby shutting off can be done in a safe and efficient manner without disrupting the gas supply to other end user lines (while, for example, certain working conditions legislation, if applicable, can are met).
    Although the invention has been elucidated on the basis of drawings and embodiments, the invention is not limited thereto. It will be clear to those skilled in the art that many variants and combinations of the shown and described embodiments are possible, insofar as such variants and combinations fall within the scope of the following claims. For example, in the drawings, a system with three emd user lines is shown; however, a system according to the invention may include any plurality of end-user lines (for example, depending on a number of end-users located in an associated building).
    As mentioned, the blocking means 3 can preferably be arranged to allow a gas leakage flow through (in particular under the influence of a gas pressure difference between an upstream side and a downstream side of the blocking means 3), which can be achieved in various ways.
    For instance, a part of the blocking means 3, for instance one or more of said shell parts 9, can be provided with a relatively small hole, or with a notch in the outer edge.
    Another possibility is for instance to provide a gas leakage passage centrally in the blocking means 3 (for instance in a part that is engaged by a said insertion device 6, if available). Furthermore, as mentioned, the blocking means 3 may, for example, be wholly or partly of one
    (earth) gas-permeable material are manufactured in such a way that a said leakage current can be achieved with it.
    权利要求:
    Claims (16)
    [1]
    A method for shutting off an end user gas line (1) connected to a main natural gas line (2), the method comprising: - introducing a blocking means (3) in the upstream direction into the end user line (1), which is adapted to insertion to substantially block a flow of natural gas through the end user line (1); and - permanently occluding the end user line (1) downstream of the inserted blocking means (3), thereby enclosing the inserted blocking means (3) in the end user line (1).
    [2]
    The method of claim 1, wherein closing the end user line (1) downstream of the inserted blocking means (3) comprises: applying an end plug (4) to the emd user line (1) downstream of the inserted blocking means (3).
    [3]
    A method according to any one of the preceding claims, further comprising opening a controllable end user valve (5), e.g. a valve or a tap, from the end user line (1), wherein the blocking means (3) via the opened controllable valve (5) is inserted, the method preferably further comprising removing the controllable valve (5) after insertion of the blocking means (3).
    [4]
    A method according to any preceding claim, wherein inserting the blocking means (3) comprises:
    - connecting the blocking means (3) to an insertion device (6); - at least partially inserting the insertion device (6) into the end user line (1) with the blocking means (3), inserting the blocking means (3) substantially completely into the end user line (1); and - detaching the insertion device (6) from the blocking means (3), the method preferably further comprising: removing the insertion device (6) from the end user conduit (1).
    [5]
    A method according to any preceding claim, wherein introducing the blocking means (3) in the upstream direction into the end user line (1) comprises: moving the blocking means (3) upstream through the emd user line (1) to, e.g. , an intended gas blocking position (7).
    [6]
    Method according to one of the preceding claims, wherein the end user line (1) is a branch of the main natural gas line (2), an overpressure in the main natural gas line being between 30 and 200 mbar, in particular about 100 mbar.
    [7]
    A method according to any one of the preceding claims, wherein the introduced blocking means (3) allows a natural gas leakage flow to pass, preferably a natural gas leakage flow with a maximum flow rate of 10 liters / hour, more preferably a maximum of 5 liters / hour, wherein the leakage flow preferably at least 0.1 liter / hour and in particular at least 1 liter per hour.
    [8]
    A system for uninterrupted distribution of natural gas to a first end-user line (1 ') located downstream of a pressurized main natural gas line (2), for example a system (13) obtained using a method according to any one of the preceding claims, wherein a second end user line (1) is provided which is also downstream of the main natural gas line (2), the second end user line (1) being closed by an internal blocking means (3) as well as an end stop (4).
    [9]
    System according to claim 8, wherein the blocking means (3) is arranged to be movable in the upstream direction in the end user line (1) and to oppose movement in the downstream direction (F).
    [10]
    System according to any one of claims 8-9, wherein the blocking means (3) is moved to a gas blocking position (7) in the end user line (1) via an opened controllable end user valve (5), for example a valve or a tap.
    [11]
    System according to any one of claims 8-10, wherein the first and second emd user lines (1 ', 1) are each a branch of the main natural gas line (2), whereby an overpressure in the main natural gas line (2) is between 30 and 200 mbar, is in particular approximately 100 mbar.
    [12]
    System according to any one of claims 8-11, wherein the internal blocking means (3) is designed to allow a gas leakage flow to pass through, and is for instance provided with a gas passage.
    [13]
    Blocking means (3) of a system according to any one of claims 8-12, wherein the blocking means (3) is arranged to be inserted in an upstream direction into a pressurized end user conduit (1), and after insertion to release a substantially blocking flow of pressurized natural gas through the end user conduit (1), wherein the blocking means is preferably adapted to allow a gas leakage flow to pass through.
    [14]
    Introducing device (6) for introducing a blocking means (3) according to claim 13 into an end user line (1) of a system according to any one of claims 8-12, wherein the introducing device (6) is connectable to the blocking means (3) wherein the thus-connected introducer (6) is at least partially insertable into the end user line (1), the connected introducer (6) being releasable from a blocking means (3) inserted into the end user line (1).
    [15]
    Building, for example an apartment complex and / or high-rise, wherein the building (14) is characterized in that it comprises a system according to any one of claims 8-12, having at least one gas main line (2) connected via a number of branches to respective end user lines (1 , 1 ', 1 ") is coupled, wherein at least one of the end user lines (1, 1', 1") is closed by an internal blocking means (3) as well as an end stop (4).
    [16]
    A method of adapting a building, for example an apartment complex and / or high-rise building, wherein the building (14) is provided with at least one natural gas main pipe (2) under gas overpressure, which is branched off via a number of branches to respective end user pipes (1, 1 ', 1 "), wherein at least some of the end user lines (1, 1', 1") are provided with a controllable end user valve (5), wherein a method according to any one of claims 1-7 is used to provide at least one of the end user lines (1, 1 ',
    1 ") and in particular to remove a respective controllable end user valve (5) from the end user line (1).
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    同族专利:
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    NL2023727B1|2021-10-04|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    NL2023411|2019-07-01|
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