Firefighting water pressure classification

I. Classification of fire water supply according to pressure conditions

2.1.4 High-pressure fire-fighting water supply system (also called constant-high pressure system)

Fire protection water supply system of constant high pressure

It can always meet the system working pressure and flow required for water fire extinguishing facilities, and it does not need fire pump directly to pressurize the system in case of fire. High-pressure water supply system—do not use water pump (including fixed pump and mobile pump)

2.1.5 Temporary high pressure fire water supply system

Fire protection water supply system of temporary high pressure

The system can not meet the system work pressure and flow required for water fire extinguishing facilities, and it can directly start the fire pump automatically in case of fire to meet the pressure and flow required by the water fire extinguishing facilities.

2.1.6 Low pressure fire water supply system

Fire protection water supply system of low pressure

It can meet the requirement that the water intake of fire engines or hand lift pumps should not be less than 0.10 MPa from the ground

The system of pressure and flow. Low-pressure water supply system—Water is added to the fire truck. The pressure of the fire extinguishing water is boosted by the fire pump on the fire truck.

Second, on the stability of the high pressure system

(1) Composition and working principle of stabilized high pressure fire water supply system:

1. The composition of stable high pressure fire water supply system:

It consists of a regulated pump, a surge tank, a water tank (or a high fire tank) and a start control device.

2. Working principle of stable high voltage system:

( 1 ) Steady high-pressure water supply system - Reliance on the voltage regulator (regulator pump, surge tank, and pressure tank) to maintain pressure;

( 2 ) Steady-state high-pressure fire water supply system: In the fire-fighting water supply network, the water pressure at the most unfavorable point in the system is usually maintained by a voltage-regulating facility to meet the needs of extinguishing the fire;

( 3 ) The fire-fighting water supply system of the fire pump is provided in the system. When the fire is extinguished, the fire-fighting pump is activated by the pressure linkage device so that the water pressure and flow rate at the most unfavorable point in the pipe network reach the water supply system required in the fire extinguishing.

(b) Two views on the stability of high-voltage systems:

1. An opinion that a stable high pressure system belongs to a temporary high pressure system (Beijing)

2. Another consideration The difference between a stabilized high pressure system and a temporary high pressure system (Shanghai) is that the temporary high pressure system cannot meet the required flow and pressure during the initial stage of a fire, and the stabilized high pressure system can meet the pressure requirements. However, it cannot meet the requirement of water quantity;

( C ) Steady-state high-pressure fire-fighting water supply system is divided by range:

1. Indoor stable high pressure fire water supply system (more common)

2. Outdoor stable high pressure fire water supply system

3. Indoor and outdoor stable high pressure fire water supply system

(D) Stabilizing the high pressure system to set the pump position space

1. Regulator pump high settings (withdrawal from the tank)

2. Regulator pump low setting (draw water from water tank or take water from tank)

(five) Five characteristics of stable high-pressure system

1. The nozzle action can spray fire water that meets the fire pressure (fire hydrant is also applicable);

2. Can make the fire pump start automatically as soon as possible;

3. There will be no water spray phenomenon of the water spray fire extinguishing system;

4. Can make fire cannon jets spray in place at the first time;

5 can properly solve the top nozzle water, and the alarm valve does not start phenomenon

(6) Disadvantages and Countermeasures of Steady High Voltage System:

1. Disadvantages: It will lead to higher pressure in the pipe network, the pipe interface is pulled by internal force, and the water gun is difficult to hold;

2. Take countermeasures:

[1] Strengthening Pipeline Foundation

[2] Add Pipe Piers

[3] Change Pipe Connection

[4] Adjusting the Regulated Pump Head

This article is from the Internet. It was reorganized and edited by China Rescue Equipment Network.