JPS6022473Y2 - Fire alarm system for floating roof oil tanks, etc. - Google Patents

Description

[Detailed description of the invention] This invention relates to a fire alarm system with an explosion-proof structure, such as a floating roof oil tank, which allows easy functional testing.

In conventional floating roof petroleum tanks, a sprinkler head is installed in the space where a fire occurs between the floating roof seal and the weather seal, and a fire extinguisher tank and a pressurized cylinder of inert gas are installed on the floating roof. It is known that the extinguishing agent in the extinguishing agent tank is kept under pressure at all times up to the end of the head with pressurized gas via piping, and the heat from the fire opens the sprinkler head and releases the extinguishing agent. .

However, although such a device is an excellent piece of equipment that has both a fire detection function and a fire extinguishing function, it is expensive because it requires a fire extinguishing device for each tank, and all the equipment including the tank is placed on the floating roof. However, since it had been set up, it had the disadvantage that functional tests etc. could not be easily carried out.

In view of the above points, this invention provides an inexpensive explosion-proof fire alarm device that can be easily tested for functionality.

An embodiment of this invention will be described below with reference to FIGS. 1 and 2.

In the figure, 1 is the peripheral wall of the storage tank body, 2 is the floating roof floating on the liquid level in the main body, 3 is the sealing device installed between the floating roof 2 and the peripheral wall 1, and 4 is the intrusion of rain and ice into the sealing device 3. 5 is a detection tube such as a copper tube installed in the space where a fire occurs formed by these seals 3 and 4;
6 is a plug body like a sprinkler head that is opened by the heat of a fire, which is attached to a large number of detection tubes 5; 7 is a floating roof 2;
It is a pressurizing cylinder installed in the detector tube 5 and used to fill the detection tube 5 with an inert gas such as nitrogen. Ru.

11 is a ladder installed between the surrounding wall 1 and the floating roof 2;
The other end of the detection tube 5 is connected via a flexible tube 13 to a piping 12 such as a copper tube attached to the piping 1.
The other end of the tank 2 is further connected via a flexible tube 14 to a pipe 15 such as a copper pipe arranged outside the tank.

Reference numeral 16 denotes an operation box installed in, for example, an oil dike 17, and the other end of the pipe 25 is connected to a gate valve 18 which is always open. A pressure switch 2 includes a pressure gauge 20 that indicates the gas pressure in the detection tube 5 and piping 15, and has a contact via a gate valve 21 that closes the switch at a predetermined pressure drop in the detection tube 5.
2 is also connected to an inert gas supply port 24 via a gate valve 23 that is opened during testing and inert gas supply.

Reference numeral 25 denotes a fire receiver that notifies of a fire by closing the contact of the pressure switch 22.

Next, to explain the operation of the above-mentioned fire alarm equipment, since the gate valves 8, 18, 19 and 21 are open during normal times, the inert gas filled in the pressurizing cylinder is passed through the detection tube 5, the stopper 6
The gas then flows into the pipe 15 and is maintained at a predetermined gas pressure, and its value is displayed and monitored on the pressure gauge 20 at the end.

Under these conditions, if a fire breaks out in the annular space formed by the seals 3 and 4 of the tank, the heat causes the stopper 6 to open and release inert gas, which competes with the action of the diaphragm 10 to cause the detection tube to explode. 5 and piping 15 drop rapidly, the contacts of the pressure switch 22 of the operation box 16 are closed, the remote fire receiver 25 is activated, and a fire alarm is issued.

In addition, when performing a function test, if the gate valve 23 is opened, inert gas will be released from the supply port 24 unless it becomes clogged in the detection tube 5, etc., so the inert gas will be released from the supply port 24 in the same way as when the stopper 6 is opened due to heat from a fire. The pressure in the detection tube 5 and piping 15 drops rapidly, and this pressure drop is displayed on the pressure gauge 20, and the pressure switch 2 is closed and an alarm is issued, indicating that the equipment is operating normally.

Furthermore, when replenishing inert gas leaking from the cylinder 7 and detection tube 5 during monitoring or inert gas released during testing, open the gate valve 23 and supply inert gas from the supply port 24, and the gas will be reversed. The pressurizing cylinder 7 is refilled via the stop valve 9.

In the above embodiment, the fire alarm system of this invention was installed in a floating roof oil tank, but a fixed roof oil tank also has a pressurizing cylinder 7, a detection tube 5, a stopper 6 and A similar implementation can be achieved by providing a check valve 9, a throttle 10, etc. attached thereto, and providing an operation box 16 having a pressure switch 22, a gate valve 23, a supply port 24, etc. outside the tank.

Since the fire alarm system of this invention is constructed and operated as described above, it is possible to easily perform functional tests in an operation box installed on a remote oil dike, etc., without having to climb up dangerous floating roofs. This has the effect of providing a fire alarm device with an inexpensive explosion-proof structure.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of a floating roof oil tank equipped with a fire alarm system of this invention, and FIG. 2 is a piping system diagram of FIG. 1. 1... Peripheral wall of storage tank body, 2... Floating roof, 3... Seal device, 4... Weather
Seal, 5...detection tube, 6...stopper,
7... Pressurization cylinder, 9... Check valve,
10... Throttle, 15... Piping, 16.
...Operation box, 20...Pressure gauge, 22...
...Pressure switch, 23...Gate valve, 24...
...Inert gas supply port.

Claims (1)

[Scope of utility model registration request] A pressurized cylinder filled with inert gas is installed on the roof of a floating roof oil tank, etc., and a fire such as a sprinkler head is placed in the space where a fire can occur between the floating roof seal and the weather seal. A detection tube is provided with a number of plugs connected to each other, which are opened by the heat generated by the gas. It is connected via a gate valve to the inert gas supply port of an operation box provided outside the tank, and this operation box is further equipped with a pressure switch for detecting a pressure drop in the detection tube and issuing a fire alarm. Fire alarm system for floating roof oil tanks, etc.