Model Meaning

Product Introduction
The QHYX-DL fire booster complete set of water supply equipment (equipped with XBD_DL vertical multi-stage fire pump) is a new type of tower free water supply equipment, consisting of three main parts: pump unit control equipment and boosting and stabilizing equipment. The water supply capacity is determined by the pump unit, and the coordinated operation of the system is controlled by the control system. The main function of the boosting and stabilizing equipment is to store energy and maintain pressure, cope with small amounts of water supply and normal pipeline leaks, and is also an indispensable part of implementing automatic control. When a large amount of water is used, the pressure in the pipeline decreases and the water pump automatically starts to supply water.
QHYX-DL fire booster complete water supply equipment (equipped with XBD_DL vertical multi-stage fire pump) can be divided into pneumatic water supply equipment and variable frequency water supply equipment according to different working modes, each with its own characteristics. Widely used in various fields such as daily life, fire protection, production, and sprinkler systems.
Water pump is the foundation of water supply equipment and the fundamental guarantee for water supply equipment to demonstrate its water supply capacity. The water pump that is matched with water supply equipment is universal and can be suitable for various flow rates and lifting programs. According to the needs of flow rate and lifting program, the product can have 1-4 or more water pumps running in parallel. The water pump unit is connected to another set of boosting and stabilizing power supply pressure equipment (water flow pump unit) to switch operation with the main pump in a small flow range, providing efficiency and further reducing energy.
According to the different working modes of the equipment, it can be divided into living type, fire-fighting type, sprinkler type, and shared models for living and fire-fighting.

Selection criteria
The basic basis for choosing an automatic water supply equipment is the designed water supply flow rate and water supply pressure (water head), and also needs to consider the type of flow variation for the purpose.
Continuous type: rarely when the flow rate is zero, or when the normal leakage of the pipeline network itself maintains a certain flow rate, such as in the pressurization system of large hotels, restaurants, industrial and mining enterprises.
Intermittent type: Long periods of low water usage and low or zero flow, such as small office buildings, commercial and residential buildings, various residential buildings, and production water use
At the same time, various factors such as changes in flow rate during a certain period of water supply, changes in flow rate in different seasons, and differences in water use in different regions should also be considered.
The complete set of fire sprinkler equipment should generally choose pneumatic water supply equipment, as it is in a system pressure maintaining state for a long time without any changes in flow rate. Pneumatic water supply equipment can cope with general pipe leaks and add a small flow auxiliary pump, so there is no need to start the main pump normally, saving energy.
The advantages of variable frequency water supply equipment are that it can supply water at a constant pressure and the constant pressure value can be adjusted within a certain range. The constant pressure accuracy is generally less than 0.02 MPa. Variable frequency speed regulation is an efficient and energy-saving method, with an average energy saving of 20% compared to typical pneumatic water supply equipment. In addition, the impact current of variable frequency start-up is small, and the pump's impact is also small, resulting in low noise during low-speed operation.
The advantages of pneumatic water supply equipment include relatively low cost, simple control system technology, convenient service, and easy maintenance.

Selection Guide
1、 Selection of pumps for variable frequency constant pressure equipment

performance parameter

General Description
1、 The pressure boosting and stabilizing equipment is a new type of fire-fighting pressure boosting and stabilizing equipment developed and designed according to the document No. 108 issued by the Ministry of Construction of the People's Republic of China in August 1996, and also complies with the regulations of 98S205 (formerly 98S176).
2、 This boosting and stabilizing equipment is designed to solve the problem of the high-level fire water tank installed in the temporary high-pressure fire water supply system. Its installation height cannot meet the requirements of the boosting facilities when the static water pressure at the unfavorable point of the system cannot be met. Therefore, a dedicated boosting and stabilizing equipment for fire protection (hereinafter referred to as the "equipment") has been designed and compiled.
3、 This equipment is suitable for various fire and domestic water supply systems such as fire hydrant water supply systems and wet automatic sprinkler systems that require pressurization facilities in multi-layer and high-rise construction projects.
4、 The "equipment" consists of WXQ pressure water tank, XBD-DL multi-stage fire hydrant pump, electrical control box, instruments, pipeline accessories, etc.
5、 This equipment is designed in accordance with the relevant technical parameters specified in the "Code for Fire Protection Design of Civil Buildings" (referred to as the "Code") GB50045-95, the "Code for Design of Pneumatic Water Supply", and CECS76:95.
6、 Design technical conditions related to this' device '
1. SQL pneumatic water tank working pressure: 0.6MPa, 1.0MPa, 1.6MPa.
2. The fire water storage capacity of SQL pneumatic water tank is greater than 150L, 300L, and 450L.
3. The stabilizing water volume of SQL pneumatic water tank is greater than 50L.
4. The buffer water volume accumulation difference of SQL pneumatic water tank is 0.02~0.03MPa, and the stabilizing water volume accumulation difference is 0.05~0.06MPa.
5. Work pressure ratio: a and b values range from 0.6 to 40℃.
7、 The working principle of this' device '
This' device 'must have the following two functions:
1. Maintain the necessary pressure for firefighting at all unfavorable points in the fire water supply pipeline system;
2. Keep the pressurized water tank filled with fire water for 30 seconds at all times. Using the P set by the pneumatic water tank1、 P2、 Ps1、 Ps2Operating pressure, controlling the operating conditions of the water pump to achieve the functions of boosting and stabilizing pressure. P1Pressure required for fire protection at unfavorable points (MPa), P2 is the starting pressure of the fire pump (MPa), Ps1To stabilize the starting pressure of the pump (MPa), Ps2Stop pump pressure for stabilizing pressure (MPa)
8、 Control the entire process of operation
Calculate the fire pressure P1 required for unfavorable points in the fire hydrant system or automatic sprinkler system, and use it as the inflation pressure of the pneumatic water tank
By calculating the selected specifications and a b values of the pressurized water tank, P2 is obtained and set

Ps1=P2+(0.02~0.03)
Ps2=Ps1+(0.05+0.06)

If there is leakage in the pipeline system during normal times, control the stabilizing water pump to continuously replenish water and stabilize the pressure, and repeat the operation at Ps1 and Ps2 (start, stop). Once there is a fire, the pipeline system will experience a significant shortage of water, causing a pressure drop in Ps1 (Ps1 → Ps2). When it drops to P2, an alarm signal will be issued and the fire pump will be immediately started (manual or automatic start determined by the designer). After the fire pump is started, the stabilizing pump will automatically stop until the fire pump stops running and the control function of the "equipment" will be manually restored.
9、 Classification of "Equipment"
According to the location of the "device", it can be divided into two types: upward (represented by I) and downward (represented by II);
According to the setting method of the pressure tank, it can be divided into vertical (represented by L) and horizontal (represented by W);
According to the fire water supply system provided by the equipment, it is divided into: fire hydrant water supply system (represented by X)
Automatic sprinkler fire extinguishing system (represented by Z)
Fire hydrant and automatic sprinkler fire water supply system (represented by XZ).
10、 Equipment model marking
Example: ①ZW(L)—I—X—10—0.16
②ZW(W)—II—X—C
11、 Calculation of P1:
P1 refers to the fire pressure required by the fire hydrant or automatic sprinkler head at unfavorable points in the fire water supply system, which is the low working pressure for the operation of this "equipment",
It is the basic data that should be mastered when selecting this device.
1. The calculation formula for the fire hydrant system is:
P1=H1+H2+H3+H4(mH2O);
H1- Geometric height from low water level in the water tank to the unfavorable point of the fire hydrant (mH)2O);
H2The sum of pressure loss along the pipeline system and local pressure loss (mH)2O);
H3- Pressure loss of water hose and fire hydrant itself (mH)2O);
H4The pressure required for the water gun to fill the length of the water column (mH)2O);
2. When the "equipment" is located in the high-level water tank room and does not self inject water from the tank, and the unfavorable point of the fire hydrant is lower than the "equipment", the calculation formula for the fire hydrant system
P1=H3+H4(mH2O)
3. The calculation formula for the automatic sprinkler fire extinguishing system is:
P1=∑H+Ho+Hr+Z(mH2O)
∑HThe sum of the pressure loss along the automatic sprinkler pipe to the unfavorable point nozzle and the local pressure loss(mH2O);
HOThe working pressure of the nozzle at unfavorable points(mH2O)
HrLocal head loss of alarm valve(mH2O)
Z- Geometric height between the unfavorable point nozzle and the low water level of the pool (or water supply main)(mH2O)
4. When this "device" is set in the high-level water tank room and self fills and absorbs water from the water tank, and the nozzle at the unfavorable point is lower than the device, the calculation formula for the automatic water spraying system is:
P1=∑H+Ho+Hr+Z(mH2O)
5. When the pressure water tank and water pump are set separately in other places, then P1Should be calculated separately.
12、 A few points to explain
1. The boosting standard for this "equipment": P1 is the low working pressure of this "equipment", and its value should meet the fire pressure required for unfavorable points in the fire water supply system. If the water supply system of a fire hydrant is used, it must meet the requirement of filling the length of the water column of the fire hydrant water gun at unfavorable points, and cannot only meet the requirement of still water Pressure of 0.07MPa or 0.15MPa is the standard for pressurization.
2. When calculating P1, the flow rate used for the pipeline system along the way and local losses should be the initial fire water supply, such as a fire hydrant system with two streams of fire hydrant flow rate of 2×5 (L/S)=10 (L/S) or 2×2.5(L/S)=5(L/S); The automatic sprinkler fire extinguishing system has a flow rate of 5 nozzles, usually using 5×1 (L/S)=5 (L/S).
3. The main components of this "equipment" include the storage water volume, stabilizing water volume, and buffering water required by the fire water supply system in the pressurized water tank Calculate its diameter and specifications based on the determined values of a and b. The storage capacity of the pneumatic water tank used for the fire hydrant water supply system shall not be less than 300L; the storage capacity of the pneumatic water tank used for the automatic sprinkler fire extinguishing system shall not be less than 150L; and the storage capacity of the pneumatic water tank used for the fire hydrant and automatic sprinkler fire extinguishing system shall not be less than 450L.
4. This "equipment" is equipped with two stabilizing water pumps (one in use and one backup). The flow rate of the stabilizing water pump should be replenished within 3 minutes to meet the required flow rate of the actual stabilizing water volume in the pressure water tank. The head of the stabilizing water pump should be taken as the value of the high-efficiency zone of the pump curve when (PS1+PS2)/2. The function of this' device 'is to ensure that there is sufficient water storage with sufficient fire pressure for 30 seconds during the initial stage of a fire, before the main fire pump is started, to carry out initial fire suppression until the main fire pump is fully loaded.
5. The fire hydrant water supply system and automatic sprinkler fire extinguishing system can share a set of pressure boosting and stabilizing equipment. When there is a fire, the pressure in the pressure water tank drops to P2, and other signals are sent to the fire control center or fire pump room according to the fire hydrant system or automatic sprinkler system. After confirmation, the fire hydrant fire pump or automatic sprinkler fire pump is started separately.
6. The use of this "equipment" in the fire hydrant water supply system is superior to the top-down installation. The upward mounted water pump has a low lifting range. P1 is the sum of the resistance loss of the water hose and water gun, as well as the pressure required for the long filling of the water column. The pneumatic water tank has a low inflation pressure and low pressure, saving steel and operating costs
13、 Electrical control performance
1. The electrical control system of this "equipment" has automatic and manual functions, and is connected to the fire control center or fire pump room.
2. Two stabilizing water pumps, one in use and one as backup, operate alternately and automatically switch between them.
3. Normally, the fire protection pipeline network is kept under high pressure and a certain amount of water is stored in the tank. Due to leakage or other reasons, when the system pressure drops to Ps1, the first pump automatically starts. When the water pressure rises to Ps2, the pump stops. The next time the pressure drops again to Ps1, the second pump automatically starts. This alternate operation keeps the system pressure between Ps1 and Ps2.
4. When a fire occurs and the system water pressure drops from Ps1 to Ps2, it outputs a signal to start the main fire pump and an audible and visual alarm. When the main fire pump starts, the reverse signal cuts off the control power of the stabilizing pump, and then the control function is manually restored.
5. The electronic control system is in a special maintenance state, which means that if the first pump fails during operation, it can be easily switched to the second pump for operation. If the second pump fails, it can also be switched to the first pump for operation, so that a water pump can still operate normally during maintenance.
6. The specifications and dimensions of the electrical control box, the principles of electrical control, and the composition of the main components can be found in our company's telegraph automatic control manual.
14、 The diaphragm type pneumatic water tank is manufactured according to the national standard 91SS852 standard atlas.
15、 The piping adopts seamless steel pipes, hot-dip galvanized steel pipes, and hot-dip galvanized seamless steel pipes.
16、 The equipment is supported by an integrated combination series of integral steel supports. The support form of the diaphragm type pneumatic water tank in this atlas is drawn according to the skirt, and a supporting support can also be used.
17、 When this' device 'is mounted on top, vibration isolation measures should be taken. During the installation of rubber vibration isolation pads, measures must be taken to prevent the water pump unit from tilting. After the installation of the vibration isolation pads, measures must be taken to prevent the water pump unit from tilting when installing the inlet and outlet pipelines, fittings, and accessories of the water pump unit to ensure safe construction.
18、 The pressure tank is equipped with a drainage device, and safety valves, remote pressure gauges, and other accessories are installed on the pipeline system.
19、 The periphery of the "equipment" should have drainage facilities to facilitate the drainage or elimination of water leakage during maintenance.
20、 There should be sufficient distance between the "equipment" and the wall or other equipment, generally not less than 700mm.
21、 The "equipment" should undergo overall water pressure test, water pressure strength test and tightness test, and be required to comply with current relevant regulations.
22、 The connecting pipes, fittings, and air pressure water tanks of the "equipment" should be coated with two coats of anti rust paint on the outer surface, and the inner surface of the air pressure water tank should be coated with non-toxic anti-corrosion paint.
23、 The technical requirements for the installation of water pumps, motors, and pipelines shall be implemented in accordance with relevant technical regulations.
24、 Precautions for operation
1. Before operating the equipment, perform height work (which is the responsibility of the production unit). After completing the debugging work, it is not allowed to dismantle the inflation nozzle of the pneumatic water tank casually to prevent air leakage.
2. During the operation of the equipment, there is no need for a dedicated person to be on duty, but regular inspections are required.
25、 The water pump used in this equipment is designed according to the XBD_DL vertical multi-stage fire pump/XBD-LG vertical multi-stage fire pump/XBD-ISG vertical single-stage fire pump series produced by our company. If other water pumps are used, corresponding water pumps can be configured according to the flow and head requirements listed in the table.
26、 The electronic control part of this device can refer to our company's electrical automatic control manual.