ZW type fire pressure boosting and stabilizing equipment

ZW Fire Pressure Boosting and Stabilizing Equipment Product Introduction

ZW fire pressure boosting and stabilizing equipment is a new type of pressure boosting and stabilizing equipment developed and designed in accordance with 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). This pressure 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 most unfavorable static water pressure point of the system, and a pressure boosting and stabilizing equipment (hereinafter referred to as "equipment") specifically designed for fire protection is prepared. 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. This equipment consists of a diaphragm pressure tank, a water pump, an electrical control box, instruments, pipeline accessories, etc. 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.

The significance of ZW fire pressure boosting and stabilizing equipment model

Example: ZW (L) - I-X-10

ZW: Boosting and stabilizing equipment

L: Vertical pneumatic water tank

I: For the overhead type, the equipment is located in the high water tank room; II: For the bottom mounted type, the equipment is located between the bottom water pump pool

X: Used for fire hydrant fire water supply system; Z: Used for automatic sprinkler fire extinguishing water supply system; XZ is used for combined fire hydrant and automatic sprinkler system

10: Fill the water column length (m) or nozzle pressure (Mpa)

Design technical conditions for ZW fire pressure boosting and stabilizing equipment

1. Working pressure of WXQ stabilizing tank: 0.6MPa, 1.0MPa, 1.6MPa.

2. The fire water storage capacity of WXQ pressure tank is greater than: 150L, 300L, 450L.

3. The stabilizing water volume of WXQ diaphragm tank is greater than 50L.

4. The buffer water volume accumulation difference of WXQ diaphragm pressure tank is 0.02~0.03MPa, and the stabilizing water volume accumulation difference is 0.05~0.06MPa.

5. Work pressure ratio: ab value is 0.6~40 ℃

Applicable conditions for ZW fire pressure boosting and stabilizing equipment

1. Fire hydrant system: The flow rate of each water gun is 2.5L/S and 5L/S, and the length of the enriched water column is 7m, 10m, and 13m.

2. Automatic sprinkler system: Each nozzle has a flow rate of 1.0L/s and a nozzle pressure of 0.1MPa.

3. The ambient temperature of the equipment should be between 5 ℃ and 40 ℃.

Working principle of ZW fire pressure boosting and stabilizing equipment

1. Maintain the pressure required for firefighting at the most unfavorable point of the fire water supply pipeline system;

2. Keep the WXQ diaphragm pressure tank filled with fire water for 30 seconds at all times Using the operating pressures P1, P2, Ps1, and Ps2 set by the pneumatic water tank, control the operating conditions of the water pump to achieve the work of boosting and stabilizing pressure

Can P1 is the pressure required for fire protection at the most unfavorable point (MPa), P2 is the starting pressure of the fire pump (MPa), Ps1 is the starting pressure of the fire stabilizing pump (MPa), and Ps2 is the stopping pressure of the GDL stabilizing pump (MPa)

The entire process of operation control of ZW fire pressure boosting and stabilizing equipment

According to the calculation, the fire pressure P1 required for the most unfavorable point in the fire hydrant system or automatic sprinkler system is obtained, which is used as the inflation pressure of the pneumatic water tank. By calculating the selected specifications and ab 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 XBD-L fire stabilizing 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 XBD-L vertical single-stage fire pump is started, the XBD-ISG fire stabilizing pump will automatically stop until the XBD-LG vertical multi-stage fire pump stops running and the control function of the "equipment" will be manually restored.

Classification of ZW fire pressure boosting and stabilizing 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).

Calculation of ZW fire pressure boosting and stabilizing equipment P1

P1 refers to the minimum working pressure required for the fire hydrant or automatic sprinkler head at the most unfavorable point of the fire water supply system. It is the basic data that should be mastered when selecting this equipment.

1. The calculation formula for the fire hydrant system is:

P1=H1+H2+H3+H4 (mH2O);

H1- Geometric height from the lowest water level of the water tank to the most unfavorable point of the fire hydrant (mH2O);

H2- the sum of pressure loss along the pipeline system and local pressure loss (mH2O);

H3- Pressure loss of water hose and fire hydrant itself (mH2O);

H4- Pressure required for the water gun to fill the length of the water column (mH2O);

2. When the "equipment" is located in the high-level water tank room and does not self inject water from the tank, and the most 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)>

∑ H - the sum of the pressure loss along the way and locally from the automatic sprinkler pipe to the most unfavorable nozzle (mH2O);

HO - Working pressure of the most unfavorable nozzle (mH2O)>

Hr - Local head loss of alarm valve (mH2O)>

Z - Geometric height (mH2O) between the most unfavorable point nozzle and the lowest water level (or supply main) of the pool>

4. When this "device" is located in the high-level water tank room and self fills and absorbs water from the water tank, and the most unfavorable point nozzle 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, P1 should be calculated separately.

Several notes on ZW fire pressure boosting and stabilizing equipment

1. The boosting standard for this "equipment": P1 is the minimum working pressure of this "equipment", and its value should meet the fire pressure required at the most unfavorable point of the fire water supply system. If the fire hydrant water supply system is used, it must meet the requirement of filling the water column length of the most unfavorable point fire hydrant water gun, and cannot only meet the static water pressure of 0.07MPa or 0.15MPa as the pressurization standard.

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. For example, in a fire hydrant system, the flow rate of two fire hydrants is 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, generally 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 volume required by the fire water supply system in the pressurized water tank. The diameter and specifications are calculated based on the determined ab value. 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 ISGD stabilizing pumps (one in use and one backup). The flow rate of the multi-stage stabilizing pump should be within 3 minutes to supplement the actual stabilizing water volume required in the WXQ diaphragm pressure tank. The stabilizing pump

The head should be taken as (PS1+PS2)/2 at the high-efficiency zone of the pump curve. The function of this "device" is to solve the initial stage of a fire, that is, before the main fire pump is started, to ensure that there is sufficient water storage with sufficient fire pressure for 30 seconds to carry out initial fire suppression until the 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 hydrant pump room according to the fire hydrant system or automatic sprinkler system. After confirmation, the fire hydrant pump or automatic sprinkler 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

ZW Fire Pressure Boosting and Stabilizing Equipment 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 pumps, one in use and one as backup, operate alternately and switch automatically.

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.

Other instructions for ZW fire pressure boosting and stabilizing equipment

1. The diaphragm pressure tank is manufactured according to the national standard 91SS852 standard atlas.

2. The piping adopts seamless steel pipes, hot-dip galvanized steel pipes, and hot-dip galvanized seamless steel pipes.

3. The equipment is supported by an integrated combination series of integral steel supports. The support form of the diaphragm pressure tank in this atlas is drawn according to the skirt, and a support type support can also be used.

4. 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.

5. The pressure tank is equipped with a drainage device, and safety valves, remote pressure gauges, and other accessories are installed on the pipeline system.

6. The periphery of the "equipment" should have drainage facilities to facilitate the drainage or elimination of water leakage during maintenance.

7. There should be sufficient distance between the "equipment" and the wall or other equipment, generally not less than 700mm.

8. The "equipment" should undergo overall water pressure test, water pressure strength test and tightness test, and be required to comply with current relevant regulations.

9. 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.

10. The technical requirements for the installation of water pumps, motors, and pipelines shall be implemented in accordance with relevant technical regulations.

Technical Characteristics Table of ZW Fire Pressure Boosting and Stabilizing Equipment