DK2975183T3 - METHOD AND SYSTEM FOR WATER PRESSURE CONTROL OR CONTROL IN A PRESSURE ZONE - Google Patents

Description

DESCRIPTION

The invention relates to a computer system which is programmed for water pressure regulation or control in a pressure zone.

There exists as standard in high buildings the requirement that the maximum water pressure at service water consumers, such as e.g. fire-fighting water wall hydrants or sprinklers, is to be restricted for safety-related or economic reasons.

If for example a supply pressure for a fire-fighting water hydrant is provided in the 40th floor at a height of 120 m then the maximum flow pressure in the event of extraction in the basement garage must likewise not exceed 8 bar - perhaps for reasons of operational safety (e.g. for the firefighting personnel) -. When considering the safety at work for the fireman the pressure of 80 MPa (8 bar) was determined as the maximum reasonable limit value. Pressure regulators were often used in the past in order to restrict the pressure at the hydrant, although these were actually banned years ago from the standards (DIN 1988) relating to fire-fighting water plants .

According to the regulations relating to the technology accepted at the time of the application two different types of systems are known which enable the maximum pressure to be limited, namely: A first type is known in which the building is divided hydraulically into several pressure zones. Here separate pipelines are laid for perhaps all 10 floors and are each supplied via individual or separate pressure boosting stations. A design of this kind according to the prior art is described in the blueprint of DIN EN 1988-500, Edition 2008, Appendix 1, design B. A second type of system is also known in which the building is supplied hydraulically via a riser pipeline. The maximum pressure is ensured here via pressure regulators and/or pressure reducers. Designs of this kind according to the prior art are again to be concluded from the previously listed blueprint of the DIN EN 1988-500, again Appendix 1, then design C and/or design D.

However both types have disadvantages: Namely the first type according to the prior art - conditioned by the provision of several riser pipelines and pressure boosting pumps - demands a high material and technical expense, if predetermined maximum pressures are not to be exceeded, which makes designs of this kind very expensive. In the case of the second type the pressure regulator- and/or pressure-reducing fittings are very sensitive and can therefore endanger the water supply. Their use in fire-fighting water systems is therefore very disputable and should be avoided (see also DIN 1988).

Starting from this situation it was desirable to develop systems which make it possible to provide service water and/or fire-fighting water systems in operation in high buildings on each floor of the building on the one hand with the pressure required or desired each time, but on the other hand also by observing the respective pressure limit with only one riser pipe and only one pump unit without using pressure regulators or pressure reducers. In principle this can happen for example by regulating the speed of a pump, such as shown for example in EP 0 962 847 Al, or GB 2 293 403.

Such a solution is found according to the prior art (see Goetsch, Enrico, Control variations for drinking water separator stations of tall buildings, published on the WorldWideWeb of the Internet on 6.5.2009 under URL:" http ://www.gep-h2o.de/service/fachbibliothek/fachbeitrag-detail .htmlibeitrag id-87") in a system which in the case of the individual line regulation when the fire-fighting water mode is triggered reverts back to a supply pressure which is filed for each floor and provides the required flow pressure -for example the required 4.5 bar - at the desired removal station. If after this a fire-fighting water alarm is triggered on the 20th floor then the pump must generate a supply pressure of for example 15 bar in order to achieve the required 4.5 bar at the 30th floor. If on the other hand a hydrant is actuated in the basement garage then the pump only has to produce a supply pressure of by way of example 5 bar in order to reach the same flow pressure there. The corresponding values are filed and in the event of a trigger at a specific floor only have to be retrieved for this floor. In practice this is implemented for example by speed-regulated pumps, such as pumps with a frequency-regulated three-phase drive.

The drawback with this procedure is however that - as is also clear in the aforementioned example - when fighting a fire at the 20th floor a supply pressure arises in parallel in the basement garage of 15 bar. If then a subsequent fire outbreak happens in the basement garage, then the maximum permitted flow pressure of 8 bar would be considerably exceeded there. The US 4 120 033 and JP 8 246511A in the prior art are concerned here with the basic possibilities for reducing a pressure which is too high. The JP 60 142076 A moreover shows a floor-dependent closed control of the water pressure which also ensures a measured water pressure in the event of extraction of water at different floors.

Overlying this problem however is the detection of faults in such systems. The detection of a fault at the water removal station - as a rule a break in the cable or a short-circuit of the signal leads assigned to the respective water removal station - is to result in adjusting or regulating the supply pressure to the level which corresponds to the highest permissible flow pressure for this water removal station, since in such a case a trigger, thus water extraction, is where possible to be expected, for which then the corresponding highest permissible supply pressure for this water removal station is to be provided. This is therefore expedient because a fault detection might possibly first take place in the case of a fire, perhaps then when the fire, before it is immediately detected - for example through smoke alarms - may have already attacked lines and thus also the signal lines assigned to the water removal station. Fault detections of this kind therefore represent an indication of a possible fire which may exist, to which the system of the fire-fighting water supply can be set up through corresponding pressure adaption, so that in the event of a trigger which then follows it can react immediately with the corresponding supply pressure. A particular problem is now however to provide an adjustment or regulation of the water pressure so that on the one hand in the event of the trigger, thus water extraction, the height-dependent supply pressure already explained above is available in a sufficient (but also maximum permissible) way, and also on the other hand an anticipatory pressure adaption using the detection of faults - particularly using the recognition of cable fractures and/or short-circuits - is guaranteed. This is therefore difficult because the corresponding events can also be dependent on one another. Thus if for example a fire is already detected on the eighth floor and the fire-fighting water system has already been triggered there, thus if it has already resulted in a water extraction at the eighth floor, then such a fire can as a result lead throughout to fault detections on other floors, namely if the fire is attacking the signal lines.

Against this background - starting from the previously mentioned prior art - it is therefore the object of the present invention to provide a computer system for a water pressure regulation system or water pressure control in a pressure zone which makes it possible to use a cost-effective single line system even in the case of parallel water extractions on different floors whilst observing the maximum pressure limits for the flow pressure, and thus on the one hand to guarantee the highest possible safety for fighting the fire by striving to observe the maximum pressure limits, but on the other hand however also to provide a precautionary water pressure adaption by fault detection, more particularly detecting cable breaks or short-circuits.

This object is achieved by a computer system according to Claim 1, the data processing unit of which is set up in such a way that it operates in accordance with a method for water pressure regulation or control in a pressure zone wherein the supply pressure is adapted to the respective removal station after detection of removal of water at the removal station by setting the maximum permissible supply pressure set point for this removal station, wherein this is realised at least as a function of the geodetic height of the removal station by means of the rotational speed control or rotational speed regulation of a pump drive whose pump supplies the removal station with water, wherein - if it is detected that water is being removed at at least one further removal station - the new supply pressure is set to the maximum permissible supply pressure set point for this further removal station at which removal of water is detected and which is according to the invention characterised in that if a fault is detected at at least one further removal station when previously no removal was detected, the new supply pressure is set to the lowest supply pressure set point for all the removal stations at which a fault is detected.

Thus if a further water extraction is detected then the new supply pressure is also set to the highest permissible value for this further removal station..

If on the other hand a fault is detected - whether a cable break or perhaps a short-circuit - namely without a water extraction previously being ascertained (detected), then the new supply pressure is set to the lowest supply pressure setpoint value for all the removal stations at which a fault is detected.

The new supply pressure is thus in this case set for example to the highest permissible supply pressure setpoint value for the lowest positioned removal station at which a fault is detected. Thus if a fault is detected on the 50th floor, then on the 4th floor and then on the 3rd floor - in each case without prior detection of any water extraction in any floor -, and the flow pressure strived for on each floor amounts to 4.5 bar, then the supply pressure is in accordance with the invention set so that it produces on the 3rd floor a flow pressure of 4.5 bar - and on the floors above same correspondingly less - . In this way such as in the example already mentioned the fire-fighting water system can then be operated so that in the event of a fire happening in the basement garage the setpoint value for the rotational speed for the pump drive is predetermined so that the pump then still only produces a pressure (supply pressure) at which only 8 bar flow pressure arises in the basement garage instead of 15 bar flow pressure. It is hereby consciously taken into account that the flow pressure for fighting a fire drops at higher floors. The site of the water extraction which takes place later is here given priority over that of the earlier water extraction since in practice it is to be assumed that fighting the fire in the meantime has shifted from the earlier water removal station to the later water removal station, where now the security of fighting the fire is to be guaranteed by a readjustment of the water pressure.

The method according to the present invention also ensures an anticipatory adjustment of the water pressure as a result of detecting a fault in that here the water pressure is set for the water removal station which corresponds to the first fault which is detected, since it is assumed that any possible source of fire is present there - or in any case close thereto - and a following firefighting, i.e. water extraction, is to be expected here first.

The trigger, i.e. the water extraction itself, similarly always has precedence over such a water pressure adjustment oriented to the fault detection, since then the highest permissible flow pressure there is then to be available at the water removal station in order to enable the most effective fighting possible of any possible fire.

The speed parameter for the pump drive can then take place so that the characteristic of the pump is filed - possibly in the memory of the computer system used for carrying out the invention - and the associated speed is determined in this way for each supply pressure setpoint value. In this case there is no need for individual sensors for the relevant pump pressure, thus the supply pressure (=operating pressure in the pressure zone) . Alternatively however the supply pressure (thus the pressure produced by the pump in the pressure zone) can also be measured by means of a pressure sensor and the setpoint value of the rotational speed of the pump drive can be used as the correcting variable for the water pressure which is to be set.

The adjustment of the supply pressure is preferably carried out not only by using the geodetic height, but also in addition in dependence on the pipe friction losses, which can occur by suitably calibrating the water distribution system and taking into account the thus discovered values in the supply pressure values filed for each floor.

The detection of the water extraction at one of the water removal stations can take place in a different way, thus for example by means of a measuring element, which is triggered upon manual actuation of a water removal station or also by a measuring element which is triggered on reaching and/or exceeding a specific water volume flow. The detection of a fault at the water removal station, i.e. by the respective measuring element assigned to the water removal station, thus perhaps one of a short circuit or cable breakage, can thus take place for example by using openers, instead of closers.

If the DIN 14462 is to be met, then all measuring elements have to be monitored individually for cable breakage, short circuit and triggering - thus perhaps for manual actuation of a water removal station or reaching and/or exceeding a specific water volume flow - .

The rotational speed control or rotational speed regulation of the pump (more precisely of the pump drive) can, as is conventionally standard, be effected by means of a regulated -preferably brushless - direct current drive as pump drive. Nowadays a frequency-control three-phase drive is generally preferred as pump drive.

With the computer system according to the present invention the setting of the supply pressure, for the case that a lowering of pressure is to occur as a result is (at least also) effected by the fact that an actuator or control element, preferably a water outlet valve, is opened for such time, or a pressure-reducing pump is operated for reducing the pressure for such time, until the new supply pressure is reached or undershot.

With regard to the deactivation of the procedure according to the invention for water pressure regulation or control in a pressure zone, it is to be pointed out that after the discontinuation of all water extraction detections and discontinuation of all fault detections at the removal stations, the supply pressure is set to the setpoint value which corresponds to the highest permissible supply pressure of all removal stations in the pressure zone (thus as a rule to the highest permissible supply pressure for the highest positioned removal station). Thus if a building has about 20 floors and the highest permissible pressure amounts to about 20.5 bar for the 20th floor then the supply pressure in the pressure zone after the discontinuation of all detections in all floors - fault detections such as also water extraction detections - is set to 20,5 bar standby pressure, so that in the most unfavourable scenario, thus for example a fire on the 20th floor, a sufficient flow pressure is immediately to be available at the removal station.

The invention described here can be problematical in those cases where a particularly long riser pipe is used - such as in high-rise apartments -, since the pressure prevailing in the riser pipe as a result of the water column becomes too high for the parts of the pipe further down. In this case it is then difficult by using the outlet valve to quickly ensure lowering the pressure of the supply pressure in the pipe which is required to reach the highest permissible flow pressure there, since the reduction of the water column - in each case by using outlet valves which are viable from the point of view of costs - can last a while, which is possibly too long for the lower regions. In conventional systems which operate with several pressure zones this problem does not generally occur since here the building is divided up into different pressure zones whose individual riser pipes are each limited by height.

In the case of the present invention therefore a pressure-reducing device can serve to carry out the method according to the invention, this device being configured so that a water supply pipe, thus perhaps the riser pipe, has at least one non-return valve which opens in an upward facing flow direction of the water from the water pressure source to the water removal station and only nearly closes in the reverse direction, because it has an opening which is configured so that as a result of gravity the water can pass through in the opposite direction to the aforementioned flow direction, in order thus during the closing of the non-return valve to set the region of the water supply pipe lying behind the nonreturn valve - seen in the upward flow direction - free of the pressure which exceeds the pressure caused by the force of gravity. With the low compression factor of water - which is 0.00021 m3/m3 K at 20°C - a small, preferably round hole in the valve of preferably no more than 10 mm, more particularly preferred of no more than 5 mm diameter, is sufficient for the return flow of the water caused by gravity for the purpose of very rapidly reducing the pressure. If the opening is not configured as a round hole, but perhaps as a bore, a (roughly) corresponding surface area of the opening cross-section of another geometry, corresponding to the round hole, is entered instead of the opening size in the diameter data.

If the water pipe, thus for example the riser pipe, is longer, then several non-return valves of this type according to the invention and spaced from one another can be provided which limit the pressure caused by the fluid column in the pipe in the respective section in each case since they each only have one small opening in the direction of the (return) flow produced by the force of gravity.

The water pressure according to the invention described above in a pressure zone regulation or control can be operated in all embodiments on a correspondingly configured computer system, wherein the computer preferably has interfaces for controlling the actuators - here for example the setpoint value of the rotational speed for the pump drive - and/or for reading off measured values or statuses of sensors - here measuring elements such as pressure sensor(s), water through-flow meters or even extraction fitment sensor (s) - . A water pressure regulation or control system for the regulation or control of the water pressure of a pressure zone can be established by means of a computer system of this kind and the corresponding measuring and/or actuator elements (actuators and/or sensors), namely one such which has a computer system which is set up as described above and which furthermore provides detectors for the respective detection of a water extraction or a fault at a removal station, which are connected via the interface for the connection for one detector or several detectors to the computer system.

Furthermore with a system of this kind a pump is provided which supplies the removal stations with water and which has a pump drive whose rotational speed can be pre-set via the interface for issuing the setpoint value of the rotational speed, wherein the computer system is connected to the pump drive via the interface for issuing the setpoint value of the rotational speed. The system according to the invention preferably also has a pressure sensor which measures the respective supply pressure (also called pump pressure), thus the operating pressure caused each time by the pump in the pressure zone.

The system according to the invention for the regulation or control of the water pressure preferably serves for the water pressure regulation or control of the service water and/or drinking water supply in a high-rise building, thus preferably in a house, wherein the floor lies at least one habitable room above 22 m above the ground surface (surrounding the high-rise building). The high-rise building then in a particularly preferred manner only has a single pressure zone for the respective supply, thus only a single riser pipe for the service water supply and/or a single riser pipe for the drinking water supply. It should however not go unmentioned that the system according to the invention (such as also the method according to the invention) can also be used in (particularly large) buildings, which have several pressure zones, namely such as then when the building is too large for a single pressure zone, thus the distance is too great between two floors which have to be supplied in parallel with one another, without the pressure at the removal station becoming too high in the lower positioned floor. In this case the present invention namely enables a reduction in the number of the pressure zones since it makes it possible to dimension these so great that two different floors can be supplied still in parallel with one another without the pressure at the lower floor being too high at the removal station or the pressure at the higher floor becoming too low.

However it is particularly preferred if the use of the present invention is for the system for the regulation or control of the water pressure for a fire-fighting water supply, preferably in a high-rise building. Also in this case the fire-fighting water network of the high-rise building can have only a single pressure zone. If it nevertheless becomes too great, then the present invention can also in this type of use be used at least for reducing the number of the pressure zones, as was already explained above when used for the service water and/or drinking water supply.

An exemplary embodiment, which is not to be considered as restrictive, will now be described with reference to the drawings in which:

Figure 1 shows a perspective diagrammatic longitudinal plan of a 50-floor high-rise building with only one firefighting water pressure zone, in which an embodiment of the present invention is used;

Figure 2 shows a longitudinal section through a riser pipe with an embodiment of a pressure-reducing device according to the invention, and

Figure 3 shows a longitudinal section through a riser pipe having a further embodiment of a pressure-reducing device according to the present invention.

Figure 1 shows a perspective diagrammatic longitudinal plan of a 50-floor high-rise building 1 with only one fire-fighting water pressure zone, in which an embodiment of the present invention is used. The high-rise building 1 has a basement floor with basement garage T and 50 floors OG of which not all the floors are each shown individually.

On the individual floors OG are located the removal stations 2 which are attached to a single common water line 3, 3a -formed as a riser pipe 3 to the upper floors OG - via which the removal stations 2 are supplied with water via a pump 4 which is located in the basement floor. The pump 4 has a speed-regulated pump drive which can be controlled by a computer system 5 via an interface for issuing a setpoint value 6 for the rotational speed. The computer system (the computer 5) has furthermore an interface for connecting detectors 7 for the detection of a water extraction at one of the removal stations 2, 2a. This interface 7 is connected via a signal line 8, 8a to the respective detector at the removal stations 2,2a, in order to be able to report the triggering of the detector to the computer system 5. These signal lines 8, 8a are preferably connected running in star-fashion to the computer 5 and - which is more particularly preferred monitors for cable breakage and/or short-circuit, which is possible for example with a corresponding line monitoring module (such as a module with resistance network, e.g. a line monitoring of Fa. Walluszek GmbH, 01591 Riesa) . In a more particularly preferred manner the signal lines 8, 8a running in star-fashion from the computer 5 to the detectors, are placed where possible together in a cable harness or next to one another on a common cable rack so that a fire at one location strikes all the signal lines there more or less simultaneously. If this happens, then for all these lines a short-circuit and/or a breakage, thus a fault, is detected. According to the present invention this has the result that the supply pressure is then set - insofar as previously no water extraction was already detected - to the lowest water pressure setpoint value of the removal stations for which a fault was detected. If there is a fire for example between the second and third floor 2.OG, 3.OG, then after a short time a fault is notified for all signal lines 8 which lie above the 2nd floor 2.OG, since the fire there strikes all these lines and leads either to a short circuit or (later) even to a cable breakage. On the other hand the lines 8 which lead to the first and second floor l.OG, 2. OG remain undamaged - in each case initially -. The computer 5 which is working according to the present invention now sets the supply pressure so that it corresponds to the supply pressure setpoint value which corresponds to the lowest water pressure setpoint value of the removal stations for which a fault was detected. The lowest water pressure setpoint value of a removal station for which a fault was detected, is in this case the water pressure setpoint value of the third floor 3.0G. The supply pressure is thus set to this value and is then available for the firefighting work there. As an alternative to the conventional star-shaped layout of signal cables with breakage/short circuit monitoring of the conventional kind, obviously also a more modern bus system can be used which has for example active signal detectors and/or further active reporting elements which normally announce their readiness via the bus in the case of a central unit, thus for example the computer 5. If such a standby signal - similar to a so-called dead man button - fails over a specific time span which is to be fixed, then at this point a fault - e.g. a cable breakage or short circuit or a breakdown of the signal detector - exists at this location. If the signal detector is attached additionally to the central unit via an additional second signal bus in the course of a separate further line, i.e. one laid over a spatially different path, then it is possible to differentiate with a high degree of probability whether it is a fault in one such line (thus breakage or short circuit) or a fault with the detector. If the detector is namely reported on only one of the two signal lines, then the other line is thus affected by a fault, if it is reported on neither of the two - spatially separately laid lines -, then a fault is probably on the detector itself or a fault occurrence (such as a fire) is present in the immediate surroundings of the detector. A removal station 2a is also located in the basement floor in the basement garage T. The computer system 5 is now in a position through corresponding programming corresponding to the present invention, for the open-loop or closed-loop control of the fire-fighting water system of the high-rise building 1 according to the invention.

When the fire-fighting water mode is triggered it reverts back to a supply pressure (also called pump pressure, thus the water pressure produced by the pump in the pressure zone) which is filed for each floor and which provides the required flow pressure - such as the required 4.5 bar - at the desired removal station 2, 2a. If after this a fire-fighting water alarm is triggered for example in the 50th floor 50.OG, then the pump 4 must produce a supply pressure of for example 20.5 bar in order to achieve the required 4.5 bar at the 50th floor 50.OG. If on the other hand a hydrant 2a is actuated in the basement garage T, then the pump 4 only has to produce a supply pressure of by way of example 5 bar in order to reach the same flow pressure there of 4.5 bar. The corresponding values are filed and in the event of the trigger at a specific floor OG need only be retrieved by the computer 5 - perhaps in the memory (working and/or mass memory) - for this floor, which then controls the pump 4 correspondingly by means of a speed value or also, if a corresponding higher pressure is already prevailing, releases an outlet valve 11 until the pressure is reached or (even just) understepped, whereupon the pump is then brought up again to the required speed value.

If now after the fire break-out in the 50th floor 50.OG there is a subsequent fire break-out in the basement garage T, then the maximum permitted flow pressure of 8 bar would then be considerably overstepped there.

Now however the present invention steps in here which not only sets the setting of the flow pressure at the respective removal station 2, 2a after detection of a water extraction to the highest permissible water pressure setpoint value for this removal station 2, which takes place perhaps in dependence on the geodetic height 9 of the removal station 2 on the 50th floor 50. OG via the speed regulation of the pump drive, whose pump 4 supplies with removal station 2 with water via the riser pipe 3, but also moreover in the event of the detection of the water extraction at a further removal station 2a - here in the basement garage T - furthermore also adapts the flow pressure to the highest permissible value for this removal station 2a, at which a (further) water extraction is detected, wherein this also (at least) takes place in dependence on the geodetic height of the respective removal stations 2,2a via the speed regulation of the pump 4 and/or an outlet valve 11 and/or also a pressure-reducing pump (thus via an adjustment of the supply pressure). A non-return valve 10 is provided here, preferably in the form of a non-return flap, which opens in the upward-pointing flow direction of the water from the water pressure source to the water removal station and closes only almost in the reverse direction, in that it has an opening which is configured so that the water can pass through same in the counter direction to the aforementioned flow direction as a result of the force of gravity in order thus as the non-return valve closes to place the region of the water supply pipe lying behind the non-return valve - seen in the upward flow direction - free of the pressure which extends beyond the pressure produced by gravity. The supply pressure, after it was built up at first for the removal station on the 50th floor 50.OG, can hereby be quickly lowered by means of a simple outlet valve to the level of the basement garage T without having to use expensive industrial valves having large cross-sectional areas.

The fire-fighting water system can thus be operated so that in the event of a fire break-out occurring in the basement garage T the setpoint value for the rotational speed of the pump drive is pre-set so that the pump 4 then still only generates a pressure at which for example only 8 bar instead of 15 bar arise in the basement garage T. It is here consciously taken into account that the flow pressure for fighting a fire on the 50th floor 50.OG drops since as a rule only one fire-fighting site is to be assumed at any one moment in time.

Figure 2 shows a longitudinal sectional view through a riser pipe 3 with an embodiment of a pressure-reducing device according to the invention. The riser pipe 3 (water supply pipe) has a non-return valve 10 - here a cover 13 movable along a guide 12 in the axial direction of the water pipe 3 in a specific region -, which opens in the upward pointing flow direction 14a of the water from the water pressure source to the water removal station - in that the cover 13 is forced upwards by the supply pressure of the water against posts 12b, whereby a closing of the section of the pipe 3 placed in this direction is prevented - and in the reverse direction 14b - in which the cover completely covers the pipe part lying in this direction - thereby only almost closes, because an opening 15 is provided which is configured so that as a result of gravity the water can pass through this in the counter direction 14b to the aforementioned flow direction 14a in order thus during closing of the non-return valve 10 to place the region of the water supply pipe 3 lying behind the non-return valve 10, seen in the upward flow direction - free of the pressure which extends beyond the pressure produced by the force of gravity.

Figure 3 shows a longitudinal sectional view through a riser pipe 3 with a further embodiment of a pressure-reducing device according to the present invention. Also here a water supply pipe 3 can be seen (here likewise a riser pipe) which has a non-return valve 10 which in the upward pointing flow direction 14a of the water opens from the water pressure source to the water removal station - namely by means of a flap 13a which is mounted for pivotable movement about an axis 12c and which is preferably also here pressed against a post 12b, so that it opens less than 90° and its closing by the water pressure always remains guaranteed - and in the reverse direction 14b - by the downward flowing water which presses the preferably not quite perpendicularly opened flap 13a - and thereby only almost closes because it has an opening 15 which is configured so that as a result of gravity the water can hereby flow through in the counter direction 14b to the aforementioned flow direction 14a, in order during closing of the non-return valve 10 to place the region of the water supply pipe 3 lying behind the non-return valve 10 - seen in the upward flow direction 14a - free of the pressure which exceeds the pressure produced by the force of gravity.

Claims (14)

A computer system (5) having at least one data processing unit and at least one memory as well as at least one interface for connecting to a detector or more detectors for a respective detection of a water withdrawal or a failure at a sampling station (7) as well as an interface for reading out a nominal rpm value to a pump drive (6), wherein the data processing unit is programmed in such a way that it operates according to a method of water pressure control or control in a pressure zone, at which the adjustment of the supply pressure at the respective discharge station ( 2, 2a) is made after detecting a water withdrawal by setting the nominal value of the supply pressure, which is maximum allowed for this withdrawal station (2, 2a), where the adjustment of the supply pressure is made at least in each case depending on the geodetic height ( 9) of the take-out station (2, 2a) via the speed control or reverse the pump speed regulator (6), whose pump (4) supplies the take-out station (2, 2a) with water, where - in the case of detection of the water take-off at at least one additional take-off station (2, 2a), the setting of the new supply pressure is made to the nominal value for the supply pressure, which is maximum allowed for this additional sampling station (2, 2a), on which a water sampling is detected, characterized in that - in the event of a faulty detection of at least one additional sampling station (2, 2a) , if no water withdrawal has been detected before, the setting of the new supply pressure is made to the lowest nominal value of the supply pressure for all take-off stations (2, 2a) at which a fault 1 has been detected. Computer system (5) according to claim 1, characterized in that the adjustment of the supply pressure is also made depending on pipe friction losses. Computer system (5) according to claim 1 or 2, characterized in that the detection of the water withdrawal at the withdrawal station (2, 2a) is carried out by a measuring device triggered by a manual operation of a withdrawal point (2, 2a). Computer system (5) according to claim 1, 2 or 3, characterized in that the detection of the water withdrawal at the withdrawal station (2, 2a) is carried out by a measuring device which is triggered by obtaining and / or exceeding a given water volume flow. Computer system (5) according to one of claims 1 to 4, characterized in that the detection of the fault at the removal station (2, 2a) is carried out by determining a cable break. Computer system (5) according to one of claims 1 to 5, characterized in that the detection of the fault at the take-out station (2, 2a) is made by determining a short circuit. Computer system (5) according to one of claims 1 to 6, characterized in that the speed control or the speed control is carried out via a, preferably brushless, DC drive as a pump drive. Computer system (5) according to one of claims 1 to 6, characterized in that the speed control or the speed control is carried out via a frequency controlled drive as a pump drive. Computer system (5) according to one of claims 1 to 8, characterized in that the setting of the supply pressure in the event of a pressure reduction also having to be effected, at least also by opening a setting device or regulating device, preferably a water drain valve , or a pressure reduction pump is activated for pressure reduction until the new supply pressure is reached or undercut. Computer system (5) according to one of claims 1 to 9, characterized in that, when all water withdrawal detections and all fault detections at the withdrawal station (2, 2a) are performed, the supply pressure is adjusted to the nominal value corresponding to the maximum allowable supply pressure in all discharge stations in the pressure zone. Computer system (5) according to one of claims 1 to 10, characterized in that the computer system is also provided with an interface for connection to a pressure sensor. Computer system (1) according to one of claims 1 to 11, characterized in that the computer system is also provided with an interface for activating a setting device, preferably a drain valve. A water pressure control or control system for water pressure control or control of a pressure zone, with a computer system (5) according to one of claims 1 to 12, as well as detectors for a respective detection of a water withdrawal or a fault at a withdrawal station connected to the computer system (5) via the interface for connecting to a detector or more detectors (7), as well as a pump (4) supplying the withdrawal stations (2, 2a) with water, with a pump drive whose speed can be determined via the interface for reading the the rated value of the rpm (6), wherein the computer system (5) is connected to the pump drive via the interface for reading the nominal value of the rpm (6). Water pressure control or control system for water pressure control or control of a pressure zone according to claim 13, characterized in that the system is also provided with a pressure sensor measuring the supply pressure in question.