CB/Z 176-1980 Design Rules for Submarine Fire Fighting Systems CB/Z176-1980 Standard download decompression password: www.bzxz.net

Guiding Technical Documents of the Sixth Ministry of Machinery Industry of the People's Republic of China
Design Rules for Submarine Firefighting Systems bzxZ.net
CB/Z176--80
1. In addition to firefighting water, submarines must be equipped with two or more special firefighting devices. These firefighting devices can be used as backup and interchangeable. One firefighting device is also allowed in small submarines. 2. The special firefighting station on the submarine should be arranged in the bow and bow compartments as much as possible. The location should be a place that is easy for the crew to reach and operate.
The pipeline design of the firefighting system should take into account that when two pipelines are damaged, the system can still work by cutting off or converting the pipeline accessories.
4 The submarine firefighting device must be safe and reliable, simple to operate, easy to use, and quick to start. At the same time, it should be possible to consider remote control or control from the compartment combat position. In places that are difficult for people to reach but have the risk of fire, automatic alarm devices must be installed. ...:
5. The fire extinguishing agent and its combustion products used in submarines should be as harmless to equipment and personnel as possible. In the case that the fire extinguishing agent or its combustion products have a certain impact on personnel, a purification device to eliminate its impact must be installed on the submarine. 6 In submarines, the fire extinguishing agent used should have a good atmosphere, strong fire extinguishing ability, be non-toxic to the human body and easy to eliminate. At the same time, it must be able to extinguish electrical fires below 380V, oil fires, and solid combustible fires such as cotton yarn and wood. Where possible, it should also be considered to be able to extinguish combustible gas fires and other combustible liquid fires other than oil. 7. The chemical properties of the fire extinguishing agent should be relatively stable and can be used normally at an ambient temperature of -10°C to 50°C. The storage of the fire extinguishing agent should be guaranteed to be non-deteriorating for at least three years. The service life of the fire-fighting device and its accessories should not be less than the storage period of the fire extinguishing agent. 8. The water fire-fighting system is only used as an auxiliary fire-fighting equipment in submarines, and is mainly used for fire-fighting outside the pressure-resistant hull. The water fire-fighting system can be configured separately on the boat or borrowed from other systems. 1. Air foam fire extinguishing system
9. When air foam liquid is used as a submarine fire extinguishing agent, a pressure ratio mixer device that mixes foam and water in a certain proportion should be used. At the same time, the method of injecting compressed air must be used to make it foam. Self-priming air foam pipe guns cannot be used to make it foam. 10. The fire extinguishing main pipe should be arranged in a long single line, and the same time, it must be considered to reduce bends as much as possible to avoid pipeline blockage. 11. In the system design, the fire extinguishing main pipe must be equipped with no less than "T"-shaped three-way cocks in each compartment. The compartment branch pipe is connected to the main pipe through the three-way cock and cannot be directly connected to the main pipe. Only after at least one of the compartment branch pipes is connected according to the above regulations, other branches are allowed to be directly connected to the main pipe. 12. When air foam is used for submarine fire extinguishing, it must be ensured that when the foam flow injection point is 1m away from the 380V electrical equipment, the current passing through the foam flow is not more than 600μA. For greater safety, a layer of non-metallic material with high insulation resistance can be sprayed on the foam nozzle. Issued by the Sixth Ministry of Machinery Industry
Submarine Professional Group
May 13, 1980
Institute 719
Total 2 pages Page 2
CB/Z176-80
13. Compressed air is used for air foam, and the foam multiple of forced foaming should be controlled at 8~11 times, so that it will not be blocked in the pipeline, and it can have a certain adhesion to objects and ensure the insulation performance for extinguishing electric fires. 14. Each compartment (layer) on the boat should be equipped with a fire extinguisher, and the layout of the nozzle should consider reaching any part of each compartment (layer).
15. For large submarines, the number of nozzles in each compartment should not be less than 2, the mixed liquid flow rate of each nozzle should not be less than 0.5 liters/second, and the range of the foam flow should not be less than 1 cm. At the same time, the design of the fire pipe must meet the requirements of 2~3 nozzles spraying at the same time as much as possible. For small and medium-sized submarines, the number of nozzles in each compartment can be one, but for longer compartments, two nozzles should be set. The mixed liquid flow rate of each nozzle shall not be less than 0.35 liters/second, and the range of the foam flow shall not be less than 8m. The design of the fire hose should meet the requirements of 1-2 nozzles spraying at the same time. 16. The air foam liquid stored in each fire station in the submarine can at least cover the floor of the largest compartment with 20mm thick air foam.
2. Submarine water fire fighting pipeline (not a special fire fighting system) 17. The submarine water fire fighting pipeline should be arranged in a single line in the superstructure. Its pipe diameter and layout should ensure that when two fire hydrants discharge water at the same time, the range of the water flow sprayed by the water gun is not less than 12m.
18. A fire hydrant should be set at the head and tail of the submarine superstructure. Each fire hydrant should be equipped with at least one fire hose, and each fire hose should have a blooming gun. The hose with a water gun should be stored near the fire hydrant. Water hoses placed on deck should be properly guarded.
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