JP6147386B1 - Water discharge and water filling method in secondary side pipe of wet sprinkler system - Google Patents

Abstract

[PROBLEMS] To provide a wet sprinkler system in which no air is trapped in a secondary side pipe when the secondary side pipe is refilled to return to a normal state after draining water in the secondary side pipe, and a method of using the same. provide. SOLUTION: A primary side pipe 16 which is piped up from an extinguishing water tank 12 via a water pump 14 and a secondary side pipe which is branched from each floor to a sprinkler head 24 for performing fire extinguishing water discharge. 22, a terminal test valve 26 at the end of the secondary pipe 22 on each floor, a control valve 18 at the base end of the secondary pipe 22 on each floor, and a terminal test valve 26 of the secondary pipe 22 on each floor A first drain pipe 34 and a second drain pipe 26 are connected to the control valve 18 through a drain valve 32 and connected to each other via a drain valve 32, and the control valve 18 is closed. The vacuum pump 44 is capable of draining the water in the secondary side pipe 22 by opening the terminal test valve 26 and the drain valve 32, and arbitrarily setting the first drain pipe 34 to a negative pressure state. Have [Selection] Figure 1

Description

The present invention relates to a method for draining water and filling water in a secondary side pipe of a wet sprinkler system, particularly when draining the water in the secondary side pipe and then filling the secondary side pipe with water in order to return to the normal state. The present invention relates to a method for discharging water and filling water in a secondary side pipe of a wet sprinkler system in which no air pool is generated in the secondary side pipe.

  Sprinkler systems are normally divided into wet and dry types depending on whether or not the secondary side pipe is filled with water. In cold regions, the dry type is used because the water in the secondary side pipes freezes. Has become the mainstream. Among them, a vacuum wet sprinkler system that has solved the problem of water loss due to malfunction of the sprinkler head has attracted attention (see Patent Document 1).

  In a wet sprinkler system, drain the water in the secondary side pipe when performing periodic inspections, replacing the sprinkler head, or extending the secondary side pipe and adding a sprinkler head. There is a need.

  FIG. 2 is a schematic configuration diagram of a conventional wet sprinkler system. For the sake of simplicity, a case is shown in which a 5-story building has eight sprinkler heads installed on each floor. Briefly explaining the system, the water stored in the fire extinguishing water tank 12 in the basement is a water supply pump 14, a primary side pipe 16, a control valve 18 that is a base end opening / closing valve of the secondary side pipe, a flowing water detector 20, Water is discharged through the secondary pipe 22 and the sprinkler head 24. The primary side pipe 16 is piped up on each floor via a water pump 14 that pumps water from the fire fighting water tank 12 and feeds it. The secondary side pipe 22 is branched from the primary side pipe 16 on each floor, and is extended to the ceiling of each floor and then further connected and branched to form a falling pipe 22b hanging vertically. Yes. A sprinkler head 24 is attached to the tip of the falling pipe 22b so as to be exposed from the ceiling of each floor.

  A first drain pipe 34 rises from the fire-extinguishing water tank 12 and is piped. A connection pipe 30 that branches from the drain pipe 34 on each floor is connected to the secondary pipe 22 via a drain valve 32 on each floor. The connection height position of the connection pipe 30 to the secondary side pipe 22 is a position lower than the height position of the water discharge surface of the sprinkler head 24.

  In addition, a second drain pipe 36 rises from the fire fighting water tank 12 and is connected to the secondary side pipe 22 via a terminal test valve 26 which is a terminal open / close valve of the secondary side pipe on each floor. A check valve 41 is attached to the upper part of the second drain pipe 36, from which air can be taken.

  When draining the water in the secondary side piping 22 of a predetermined floor, the control valve 18 is first closed. Thereafter, the end test valve 26 and the drain valve 32 are opened. Thereby, a part of the water in the secondary side pipe 22 is discharged through the second drain pipe 36 and most of the water is discharged through the first drain pipe 34. Air enters from the check valve 41 installed at the upper part of the second drain pipe 34, and the water in the secondary side pipe 22 can be drained by the action of gravity.

In the event of a fire, the sprinkler head 24 is activated and the water in the secondary side pipe 22 is released. When water in the secondary side pipe 22 is discharged, a pressure switch (not shown) attached to the primary side pipe 16 detects a pressure drop and sends a signal to a control panel (not shown). In response, the water pump 14 is operated. Further, when water continuously flows from the primary side pipe 16 to the secondary side pipe 22, the flowing water detection device 20 detects the flowing water and issues a warning that fire extinguishing is being performed.

Japanese Patent No. 3264939

  After draining the water in the secondary side pipe 22 for work such as inspection, it is necessary to refill the inside of the secondary side pipe 22 with water in order to return the system to the normal state. At this time, if an air pool is generated in the secondary side pipe 22, the air pool is compressed by the filled water and remains in the secondary side pipe 22 as high-pressure air. That is, the filling of the water into the secondary side pipe 22 is performed by operating the water supply pump 14 with the control valve 18 and the terminal test valve 26 opened and the drain valve 32 closed, so that the inside of the secondary side pipe 22 Air escapes from the end test valve 26. When water comes out from the end test valve 26, the water pump 14 is stopped and the end test valve 26 is closed. However, when the secondary side piping 22 branches in a complicated manner and there are many branches, the air in the branched secondary side piping does not escape and forms an air reservoir. When water is filled there, the air reservoir (residual air) is compressed to become high-pressure residual air and remains in the secondary side pipe 22.

  If there is a compressed air pool in the secondary side pipe 22, the oxygen in the air pool dissolves in the water and the dissolved oxygen concentration increases, and a pinhole is formed in the secondary side pipe 22 due to the macrocell phenomenon. The problem is that water leaks.

  Therefore, in the wet sprinkler system, when water is filled in the secondary side pipe 22, it is important not to cause air accumulation in the secondary side pipe 22. So far, in the wet sprinkler system, a wet sprinkler system having a configuration in which the problem of air accumulation is solved when water is filled in the secondary side pipe 22 has not been disclosed.

  On the other hand, in a vacuum wet sprinkler system (Patent Document 1) that maintains water in the secondary side pipe in a negative pressure state and can prevent water loss without being discharged from the sprinkler head even if the sprinkler head malfunctions. Is provided with negative pressure maintaining means on the secondary pipe side. By using this negative pressure state maintaining means, the water in the secondary side pipe can be brought into a negative pressure state.

  Even in the vacuum wet sprinkler system, water in the secondary side pipe may be drained for inspection and other work, and in order to return to the normal state, it is necessary to fill the secondary side pipe with water. However, in the vacuum wet sprinkler system, when the secondary side pipe is filled with water using this negative pressure state maintaining means, the secondary side pipe is sucked to draw the air in the secondary side pipe. It is possible to remove. Therefore, the above-described problem does not occur in the vacuum wet sprinkler system.

The present invention has been made in view of the above-mentioned problems, and its purpose is to re-enter the wet sprinkler system in order to return to the normal state after draining the water in the secondary side pipe for inspection and other work. An object of the present invention is to provide a method of filling water into the secondary side pipe of a wet sprinkler system that does not cause air accumulation in the secondary side pipe when the inside of the secondary side pipe is filled with water .

In order to achieve the above object, a method for discharging water and filling water in the secondary side pipe of the wet-prinkler system according to claim 1,
A primary pipe is the pipe rises upwards floors from the extinguishing water tank through a water pump, is branched at each floor from the primary side piping, and the secondary side piping are arranged sprinkler head for performing extinguishing water discharge, Terminal open / close valve installed at the end of the secondary pipe on each floor and opened and closed arbitrarily, and installed at the base end of the secondary pipe on each floor branched from the primary pipe. A possible base end on-off valve, a connecting pipe connected between the terminal on-off valve and the base end on-off valve via a drain valve that can be arbitrarily opened and closed to the secondary side pipe on each floor, and The connection pipe of each floor is connected in communication, the first drain pipe whose lower end is a drain outlet to the fire fighting water tank, and the terminal opening / closing valve of each floor , the upper end is an air intake and the lower end is the second, which is a drain port of the the fire extinguishing water tank A drain pipe, said first drainage pipe and optionally negative pressure, suction means capable of also the negative pressure state the secondary side in the pipe by the drain valve opened, In the water discharge and water filling method in the secondary side pipe of the wet sprinkler system having
Said proximal-off valve closed, the water discharge step of removing the water in the secondary side in the pipe the end-off valve and the drain valve is opened state, after the water discharge step, the proximal-off valve and the the end off valve closed state, a negative pressure step, with the same negative pressure state the secondary side in the pipe by the said first drainage pipe negative pressure state by the suction unit the drain valve is opened condition, At the end of the negative pressure step , the drain valve is closed and the base end on-off valve is opened, and the base end on-off valve is controlled by the water pump while maintaining a negative pressure state in the secondary side pipe. And a water filling step of filling the secondary side pipe with water.

  With this method, when the work on the inspection etc. is completed and the secondary side pipe is filled with water in order to return the system to the normal state, the inside of the first drain pipe is brought into a negative pressure state by the negative pressure process. Similarly, the inside of the secondary side pipe that communicates can be in a negative pressure state. Therefore, even if the secondary pipe is branched in a complicated manner, it is effectively prevented that air pools are generated in the secondary pipe when water is filled in the water filling process, and pinholes caused by the macro cell phenomenon are prevented. Formation is prevented well.

According to the water discharge and water filling method in the secondary side pipe of the wet sprinkler system of the present invention, the generation of high-pressure residual air in the secondary side pipe is prevented when the secondary side pipe is filled with water. Therefore, the dissolved oxygen concentration of the filled water in the secondary side pipe does not increase, and the occurrence of pinholes due to the macrocell phenomenon can be effectively prevented. Therefore, a highly reliable wet sprinkler system can be provided over a long period of time.

It is a schematic block diagram of a system according to a water discharge and water filling method in a secondary side pipe of a wet sprinkler system of the present invention. It is a schematic block diagram of the conventional wet sprinkler system.

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a system related to a water discharge and water filling method in a secondary side pipe of a wet sprinkler system of the present invention. For the sake of simplicity, a case is shown in which a 5-story building has eight sprinkler heads installed on each floor. Compared with the wet sprinkler system 11 shown in FIG. 2, the wet sprinkler system 10 of the present embodiment has a vacuum pump 44 as a suction means in the first drain pipe 34 that drains the water in the secondary side pipe 22. The only difference is that it is installed. Therefore, the same components as those in FIG.

  A branch pipe 40 is connected to the first drain pipe 34 in the vicinity of the fire fighting water tank 12. The vacuum pump 44 is connected to the branch pipe 40. A check valve 42 is attached below the branch pipe 40 of the first drain pipe 34 to which the branch pipe 40 is connected. The water flowing down the first drain pipe 34 flows straight into the fire fighting water tank 12 through the check valve 42.

  This vacuum pump is configured to discharge not only gas but also liquid, and is available, for example, from Speck Pumpen Vakuumtechnik GmbH of Germany (European Patent No. EP1518055). This vacuum pump is a practical pump that can be used for a long time even in a high-load state where a fluid such as water is mixed with the fluid to be sucked and discharged.

  The procedure for draining the water from the secondary side pipe 22 on the predetermined floor that requires inspection work will be described. The control valve 18 on that floor is closed, and the end test valve 26 attached to the end of the secondary side pipe 22 is opened. Open. When the drain valve 34 is opened, the water in the secondary side pipe 22 on that floor passes through the drain pipe 34 due to the action of gravity and flows out to the fire fighting water tank 12 through the check valve 42.

  A procedure for returning the system to a normal state after draining water from the secondary side pipe 22 and finishing predetermined work such as inspection of the sprinkler head will be described. To return the system to the normal state, the secondary side pipe 22 from which the water has been drained is filled again with the water pump 14 activated, and the standby state in which water can be discharged from the sprinkler head 24 at any time in preparation for a fire. Means. Before filling with water, the control valve 18 and the end test valve 26 are closed, the drain valve 32 is opened, the vacuum pump 44 is operated, and the inside of the first drain pipe 34 and the secondary side pipe 22 are sucked. And discharge (evacuate). Thereby, the inside of the 1st drainage pipe 34 and the inside of the secondary side piping 22 will be in a negative pressure state, and can eliminate an air pool (residual air) effectively. That is, even when the secondary side pipe 22 is complicatedly branched on the plane and there are many branched secondary side pipes 22, it is possible to exclude residual air in the secondary side pipe 22. Thereafter, the drain valve 32 is closed and the control valve 18 is opened, and the water supply pump 14 is operated to fill the secondary side pipe 22 with water. This filling can be easily performed because the secondary side pipe 22 is in a negative pressure state.

  Accordingly, no high-pressure residual air is generated in the secondary side pipe 22, so that oxygen in the high-pressure residual air does not dissolve in the water in the secondary side pipe 22, and pinhole formation due to the macrocell phenomenon may occur. Absent.

  In the present embodiment, a constant flow valve 46 is attached to the inlet side of the vacuum pump 44. Although the vacuum pump 44 can practically endure a high load, the constant flow valve 46 is configured so that water with a flow rate higher than the rating enters the vacuum pump 44 and is not overloaded. This makes it possible to use the vacuum pump 44 for a long period of time.

According to the water discharge and water filling method in the secondary side pipe of the wet sprinkler system of the present embodiment, since the vacuum pump for sucking the inside of the first drain pipe and the secondary side pipe is attached, When filling water, it is effectively prevented that high-pressure residual air is generated in the secondary pipe. Thereby, the dissolved oxygen concentration of the water in the secondary side pipe | tube does not increase, and a pinhole is not formed in a secondary side pipe | tube by the macrocell phenomenon derived from this. Therefore, it is possible to provide a wet sprinkler system having high reliability over a long period of time.

  In addition, this invention is not limited to the above-mentioned embodiment, A various change is possible in the range which does not deviate from the summary of this invention. For example, although the normal wet sprinkler system has been described in the embodiment, a pre-actuated wet sprinkler system in which a fire sensor is installed may be used.

10, 11 Wet sprinkler system 12 Fire extinguishing water tank 14 Water supply pump 16 Primary side piping 18 Control valve (base end on-off valve)
20 Flowing water detection device 22 Secondary side piping 24 Sprinkler head 26 Terminal test valve (terminal open / close valve)
30 Connection pipe 32 Drain valve 34 First drain pipe 36 Second drain pipe 41, 42 Check valve 44 Vacuum pump 46 Constant flow valve

Claims (1)

A primary side pipe that is piped up from the fire fighting water tank to the upper floor via a water pump;
Is branched at each floor from the primary side piping, and the secondary side piping are arranged sprinkler head for performing extinguishing water discharge,
A terminal on-off valve that is installed at the end of the secondary pipe on each floor and can be arbitrarily opened and closed;
A base end opening / closing valve that is installed at a base end portion of the secondary side pipe of each floor branched from the primary side pipe and can be arbitrarily opened and closed;
Connection pipes connected to each other via a drain valve that can be arbitrarily opened and closed between the terminal on-off valve and the base end on-off valve on the secondary pipe on each floor ,
A first drain pipe in which the connection pipes of the respective floors are connected in communication, and a lower end portion thereof is a drain outlet to the fire fighting water tank ;
A second drain pipe connected to the terminal opening / closing valve of each floor , the upper end of which is an air intake and the lower end of which is a drain to the fire fighting water tank ;
Said first drain pipe in a freely negative pressure, suction means capable of also the negative pressure state the secondary side in the pipe by the drain valve opened,
In the water discharge and water filling method in the secondary side pipe of the wet sprinkler system having
It said proximal-off valve closed, the water discharge step of removing the water in the secondary side in the pipe the end-off valve and the drain valve is opened condition,
After the water discharge step, the proximal-off valve and said distal-off valve closed, the secondary side by the first drainage pipe negative pressure state by the suction unit the drain valve is opened condition A negative pressure process in which the inside of the pipe is also in a negative pressure state,
At the end of the negative pressure step , the drain valve is closed and the base end on-off valve is opened, and the base end on-off valve is controlled by the water pump while maintaining a negative pressure state in the secondary side pipe. and water filling step of filling the water to the secondary side in the pipe through,
A method for draining and filling water in a secondary side pipe of a wet sprinkler system.

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