JPS5820285Y2 - Chemical tanker fire extinguishing water spray system - Google Patents

Description

[Detailed description of the invention] This invention relates to a fire extinguishing water spray device for a chemical tanker.

Generally, chemical tankers are required to be equipped with a device for spraying water onto the exposed parts of the tanks that house the cargo, due to safety requirements for the cargo being transported.

As an example, Nippon Kaiji Kyokai's ll5HIPs FOR
LIQUEFIED GASES AND 5H
IPS FORDANGEROUS CHEMICAL
S++ (1977), Part N, Chapter 11, describes the relevant provisions: rll, 3 Water spray equipment 11.3.1 Vessels transporting flammable or toxic cargo must be equipped with cooling, fire protection and For the protection of the crew, water spray equipment must be provided to spray water at the following locations:

(a) All exposed parts of exposed tank domes and cargo tanks; (b) Exposed flammable or toxic cargo containment on deck [(C) and (d) omitted] 11.3.2 Water The spraying device has a speed of at least 101/m2 per minute for horizontal projection surfaces and 1/m2 for vertical surfaces.
11 by uniformly distributed water spray at 417m2 per minute.
．． It must be able to cover all areas listed in 3.1.

(Hereinafter omitted)" As described above, each classification society's regulations require chemical tankers to be equipped with this device.

1 to 3 show the installation mode of a conventional spraying device, and a chemical tanker 1 is provided with a cargo tank 3 at the lower part of an upper deck 2.

4 is a permanent walkway placed on the upper deck 2 to connect the aft part of the forecastle deck with the aft part of the forecastle deck;
are handrails provided on both sides of the upper deck 2, and 7 and 8 are handrails provided on the permanent walkway 4.

Reference numeral 9 denotes a pump for supplying water to the water spray device, which usually doubles as a ballast pump.

Water supplied from the pump 9 is sent to two main feed pipes 10.11 arranged longitudinally on the upper deck 2, and a number of branch feed pipes 12.12... sent to.

Each feed pipe 12 is provided with a large number of downward spray nozzles 13° 13 in the middle thereof, and a predetermined amount of water is sprayed all at once from the spray nozzles 13 toward the surface of the upper deck 2. It is arranged like this.

14.14... are struts for supporting the main feed pipe 10.11'), 14', 14'...
* is a support for supporting the feeding branch pipe 12.

The conventional device shown above is an example of a device for uniformly sprinkling a predetermined amount of water onto the upper surface of the upper deck 2. There are various other piping configurations to achieve the same effect. In short, a main feed pipe in the longitudinal direction and a large number of feed branch pipes connected to the main feed pipe are arranged at a predetermined height above the upper surface of the upper deck 2 in a mesh pattern. It is necessary to install a wisteria trellis-shaped piping device, and this type of system is still in use today.

However, if such a device is installed on the upper deck, not only will there be no space for the trick boom type cargo lifters, which are normally installed on the upper deck for unloading general cargo, but it will also eliminate the need for work on the upper deck. This poses a significant obstacle to walking, and the upper deck becomes almost useless, resulting in severe interference with the daily operations of the ship.

This idea was made in view of the above problems.
The configuration will be described in detail below based on drawings showing embodiments.

4 and 5, 15 and 16 are spray water supply pipes that function as handrails installed on both sides of the upper deck 2, and 17 and 18 are permanent main lines. 4 is a spray water supply pipe that functions as a handrail.

The spray nozzles 13.13... are connected to each feed pipe 15,
16, 17 and 18 at an appropriate interval, and the direction of spraying is such that the spray water can be sprayed uniformly over the upper deck 2 as a whole, as shown in FIG.

Therefore, if the hull size of the chemical tanker 1 to which the chemical tanker 1 is applied is small, the feed pipes 15 and 16 on both sides may be installed and the feed pipes 17 and 18 may be eliminated; On the contrary, only the feed pipes 17, 18 may be provided and the feed pipes 15, 16 may be omitted.

The water supplied from the pump 9 is sent to the feed pipes 15.16 and 17.18 and to the spray nozzles 13.13...
..., water is uniformly sprinkled on the upper deck 2 in the manner shown in Figure 5.

This device reduces and simplifies the number of structures installed on the upper deck by making the spray water supply pipe, which needs to be installed on the upper deck, also serve as a handrail, which also needs to be installed on the upper deck. By configuring the fire extinguishing water spray system in this way, the conventional wisteria trellis-shaped piping system and the pillars erected to support it on the upper deck can all be removed. , obstacles to use on the upper deck can be removed.

In addition, even if there is a slight increase in costs due to replacing the conventional steel materials for handrails with feed pipes, when viewed as a whole, the above-mentioned increase will be much lower than the cost savings resulting from the application of the proposed device. This is extremely effective, and by increasing the strength of the handrail, it also helps solve the problem of handrail resonance caused by hull vibration, which could occur with conventional systems, demonstrating excellent effects not found in conventional devices. It is something to do.

[Brief explanation of drawings]

Fig. 1 is a side view showing the arrangement of the conventional device, Fig. 2 is a plan view thereof, Fig. 3 is an enlarged sectional view taken along line III-III in Fig. 1, and Fig. 4 shows the arrangement of the proposed device. The plan view shown in FIG. 5 is an enlarged sectional view of the main part taken along the line v--■ in FIG. 4. 1... Chemical tanker, 2... Upper deck, 3... Cargo tank, 4... Permanent route, 5, 6, 7.8... ...Handrail, 9...
・Pump, 10.11... Main feed pipe, 12...
...Feeding branch pipe, 13...Spray nozzle, 14
．． 14'... Support, 15, 16, 17゜18.
...Feed pipe.

Claims (1)

[Scope of utility model registration request] A fire extinguishing water spray system for a chemical tanker, in which a handrail provided on both sides of the upper deck or a handrail provided on a permanent walkway on the upper deck is configured as a feed pipe for spray water.