Low pressure means municipal water supply and municipal pressure, which is generally .2MPa. High pressure can be divided into normal high pressure and temporary high pressure. Normal high pressure, as the name implies, means that the pressure is always kept at a high value.

For example, the water comes from a pool on the mountain, and there is a certain pressure. Why raise the pool on the mountain? Because in general, the municipal pressure will not be too high, otherwise the pipe network can't stand it and it will be wasted. Temporary high pressure means that there is a roof water tank at ordinary times to stabilize the pressure. When there is a fire, start the fire pump.

to stabilize the high pressure means to have a pressure stabilizing air tank, which is tested to ensure the pressure. In case of fire, the water pump is also started.

temporary high pressure and steady high pressure are somewhat similar.

high-pressure fire water supply system: the water pressure and flow rate of the most unfavorable point in the fire water supply network can meet the needs of fire fighting at ordinary times, and there is no fire water supply system with fire pump and fire transfer pump. ?

stable high-pressure fire water supply system: in the fire water supply network, the water pressure of the most unfavorable point in the system is usually maintained by the pressure stabilizing facilities to meet the needs of fire fighting, and the fire water supply system with fire pumps is installed in the system. When putting out the fire, the fire pump is started by the pressure linkage device, so that the water pressure and flow at the most unfavorable point in the pipe network can meet the requirements of extinguishing the fire. ?

temporary high-pressure fire water supply system: the water pressure and flow rate of the most unfavorable point in the fire water supply network can't meet the needs of fire fighting, and the fire water supply system with fire pump is installed in the system. Start the fire pump when extinguishing the fire, so that the water pressure and flow at the most unfavorable point in the pipe network can meet the requirements of extinguishing the fire. ?

low-pressure fire water supply system: the flow rate meets the requirements of fire fighting.

Extended information

Design principles of fire water supply system

1. Basic principles

We must follow the relevant national guidelines and policies, and be safe, reliable, technologically advanced, economical and convenient to use according to the characteristics of the protected objects.

2. Requirements

(1) The scope of building fire protection design is very wide, and it is a multi-disciplinary and multi-disciplinary comprehensive problem. Moreover, the larger the building scale, the more functions it has, and the more complicated the control items are. Therefore, in modern building facilities, fire protection design must adopt mechanization and automation as much as possible, and adopt rapid and reliable control methods to minimize fire losses.

(2) In system design, it should also be noted that under the same conditions, domestic equipment should be given priority as much as possible, and foreign equipment should not be introduced easily when it is not necessary. First, foreign products are generally expensive, need foreign exchange, and are inconvenient to maintain in the future, and are easily subject to people; Moreover, domestic products are constantly improving, and their performance indicators and technical level are not worse than those of foreign products. Adopting domestic equipment is conducive to promoting the development of national industries and saving a lot of foreign exchange. This point cannot be ignored.

(3) The current national standards and codes to be followed in system design mainly include Code for Design of Automatic Fire Alarm System (GB 5116-98), Code for Fire Protection Design of High-rise Civil Buildings, Code for Fire Protection Design of Buildings, Code for Fire Protection Design of Civil Air Defense Works, Code for Design of Power Supply System of Industrial and Civil Buildings, and so on.

(4) The design of the system must be undertaken by the design unit recognized and approved by the relevant state departments.

(5) The pre-design work should be

① Find out the basic situation of the building, including the nature, specifications, functions and individual aspects of the building; Division of fire protection zones, fire protection measures, structural forms and decorative materials for architecture and structure specialty; Elevator configuration and management, shaft layout; Layout, nature and use of all kinds of computer rooms and warehouses.

② find out the fire-fighting facilities and requirements of relevant disciplines, including the setting of air supply, exhaust and air conditioning systems; The setting of smoke control system and the requirements for electrical control and interlocking; The setting of fire extinguishing system (fire hydrant, automatic sprinkler and halon system) and the requirements for electrical control and interlock; The setting of fire shutter doors and fire doors and the requirements for electrical control: the control of power supply, distribution system, lighting and power supply and the coordination of fire protection zones; Configuration of fire power supply, etc.

③ define the design principles, including determining the classification level and protection mode of building fire protection according to the specification requirements, formulating the scheme of automatic fire protection system, and fully mastering the technical performance and requirements of various fire-fighting equipment and alarm equipment.

Reference: Baidu Encyclopedia-Fire Control Linkage System