Product Description
Model Code Explanation
Product Overview
The W*/*-HY Fire Pressure-Stabilizing Booster Unit is a newly developed pressure boosting and stabilization system designed in accordance with the Ministry of Construction Document [1996] No.108 (issued in August 1996). It also complies with the national design standard 98S205 (originally 98S176). The Unit is specially engineered to meet the requirements of modern fire-fighting water supply systems.
This booster unit is designed to solve the problem of insufficient static pressure at the most unfavorable points in temporary high-pressure fire water supply systems when the elevation of the fire water tank cannot provide adequate pressure. It serves as a dedicated fire-fighting booster and pressure-stabilizing device (hereinafter referred to as “the Unit”).
The Unit is suitable for fire hydrant systems and wet-type automatic sprinkler systems in multi-storey and high-rise buildings that require pressure boosting, as well as various fire-fighting and domestic water supply systems.
The Unit consists of a diaphragm pressure tank, pressure-stabilizing pump, electrical control cabinet, measuring instruments and pipeline accessories. The design follows the requirements of the Code for Fire Protection Design of High-Rise Civil Buildings (GB50045-95) and the Technical Specification for Pressure Vessel Water Supply (CECS 76:95).
Technical Conditions
- SQL diaphragm pressure tank working pressure: 0.6 MPa, 1.0 MPa, 1.6 MPa.
- Minimum fire storage volume of SQL diaphragm tanks: 150 L, 300 L, 450 L.
- Minimum pressure-stabilizing water volume of SQL diaphragm tanks: ≥ 50 L.
- Buffer water volume pressure differential: 0.02–0.03 MPa; stabilizing water volume pressure differential: 0.05–0.06 MPa.
- Working pressure ratio (a/b value): applicable in the range of 0.6–40°C.
Service Conditions
- Fire hydrant system: nozzle flow per jet 2.5 L/s or 5 L/s, effective jet length 7 m, 10 m or 13 m.
- Automatic sprinkler system: flow rate per sprinkler head 1.0 L/s, operating pressure 0.1 MPa.
- Recommended ambient temperature: 5°C–40°C.
Working Principle
- Ensure that the most unfavorable point in the fire-fighting pipeline system always maintains the required fire pressure.
- Ensure that the WSQL diaphragm pressure tank always stores at least 30 seconds of fire-fighting water volume.
- By using preset operating pressures P1, P2, Ps1 and Ps2 in the pressure tank control logic, the Unit automatically controls the operating status of the water pumps to achieve pressure boosting and pressure stabilization.
- P1: required fire pressure at the most unfavorable point (MPa).
- P2: fire pump start pressure (MPa).
- Ps1: fire pressure-stabilizing pump start pressure (MPa).
- Ps2: fire pressure-stabilizing pump stop pressure (MPa).
Structure Diagram
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Full Operation Control Process
The required fire pressure P1 at the most unfavorable point of the hydrant or sprinkler system is first calculated and used as the inflation pressure of the diaphragm pressure tank. According to the selected tank specification and the corresponding a/b value, P2 is obtained and the operating pressures are set as follows:
- Ps1 = P2 + (0.02–0.03 MPa)
- Ps2 = Ps1 + (0.05–0.06 MPa)
During normal standby operation, if the system pressure drops due to leakage or other minor losses, the XBD-L fire pressure-stabilizing pump automatically starts to replenish water and restore pressure. The pump operates cyclically between Ps1 (start) and Ps2 (stop), keeping the system pressure stable.
When a fire occurs, the system pressure drops rapidly from Ps1 towards P2 due to large water consumption. When the pressure falls to P2, an alarm signal is generated and the fire pump starts immediately (manual or automatic start as specified by the designer). After the XBD-L vertical single-stage fire pump is started, the XBD-HY stabilizing pump stops automatically. The stabilizing system is manually reset only after the main fire pump has completed its operation.
Equipment Classification
- By installation position:
- Type I – Upper installation (I)
- Type II – Lower installation (II)
- By pressure tank configuration:
- L – Vertical diaphragm tank
- W – Horizontal diaphragm tank
- By fire-fighting water supply system:
- X – Fire hydrant system
- Z – Automatic sprinkler system
- XZ – Combined hydrant and sprinkler system
Calculation of P1
P1 is the required fire pressure at the most unfavorable fire hydrant or sprinkler head. It is the minimum operating pressure for this Unit and is the key design parameter for selection.
1. Hydrant system (Unit on ground floor, suction from water tank)
P1 = H1 + H2 + H3 + H4 (mH₂O)
- H1 – Geometric height from the minimum water level of the water tank to the most unfavorable fire hydrant (mH₂O)
- H2 – Sum of pipeline friction and local pressure loss (mH₂O)
- H3 – Pressure loss of fire hose and hydrant (mH₂O)
- H4 – Nozzle pressure corresponding to the required effective jet length (mH₂O)
2. Hydrant system (Unit in high-level tank room, gravity-fed, most unfavorable hydrant below the Unit)
P1 = H3 + H4 (mH₂O)
3. Automatic sprinkler system (Unit on ground floor, suction from water tank)
P1 = ∑H + Ho + Hr + Z (mH₂O)
- ∑H – Sum of pipeline friction and local losses from the supply to the most unfavorable sprinkler (mH₂O)
- Ho – Operating pressure at the most unfavorable sprinkler (mH₂O)
- Hr – Local head loss across the alarm valve (mH₂O)
- Z – Geometric height between the most unfavorable sprinkler and the minimum water level of the water tank (or supply main) (mH₂O)
4. Automatic sprinkler system (Unit in high-level tank room, gravity-fed, most unfavorable sprinkler below the Unit)
P1 = ∑H + Ho + Hr + Z (mH₂O)
5. Separate installation of tank and pump
When the pressure tank and the pump are installed in different locations, P1 must be recalculated according to the actual system layout.
Equipment Notes
- P1 is the minimum operating pressure of the Unit and must satisfy the fire pressure requirements at the most unfavorable point. For hydrant systems, it must guarantee sufficient jet length of the fire stream and not be simply taken as 0.07 MPa or 0.15 MPa static pressure.
- When calculating P1, the design flow should be the initial fire-fighting flow:
- Hydrant systems: 2 × 5 L/s = 10 L/s or 2 × 2.5 L/s = 5 L/s.
- Sprinkler systems: typically 5 sprinklers operating, 5 × 1 L/s = 5 L/s.
- The pressure tank must provide sufficient volumes for:
- Fire storage water volume
- Pressure-stabilizing water volume
- Buffer water volume
According to standards:
- Hydrant-only systems: fire storage volume ≥ 300 L.
- Sprinkler-only systems: fire storage volume ≥ 150 L.
- Combined hydrant and sprinkler systems: fire storage volume ≥ 450 L.
- The Unit is equipped with two stabilizing pumps (one duty, one standby). The stabilizing pump flow rate must be sufficient to replenish the actual stabilizing water volume of the WXQ diaphragm tank within 3 minutes. The pump head should be selected according to the average pressure (Ps1 + Ps2) / 2 in the high-efficiency range of the pump performance curve.
- One booster unit can serve both hydrant and sprinkler systems. When pressure in the tank drops to P2 during a fire, the Unit sends start signals respectively to the hydrant pump or the sprinkler pump according to fire-fighting control logic.
- For hydrant systems, upper-level installation (Type I) is generally more economical than lower-level installation (Type II), because the required pump head is lower and tank pressure is reduced, which saves steel consumption and operating cost.
Electrical Control Features
- The electrical control system provides both automatic and manual modes and can be networked with the fire control center or fire pump room.
- Two stabilizing pumps are configured as duty and standby units and operate alternately with automatic switching.
- Under normal standby conditions, the fire-fighting network is maintained at a high pressure and the tank stores a certain amount of water. When system pressure falls to Ps1 due to leakage or minor consumption, Pump No.1 starts automatically and stops at Ps2. The next time pressure drops to Ps1, Pump No.2 starts. The two pumps alternate to keep system pressure always between Ps1 and Ps2.
- When a fire occurs and pressure drops from Ps1 to P2, the system outputs a start signal for the main fire pump together with audible and visual alarms. Once the main fire pump has started and feedback is confirmed, the stabilizing pumps are disconnected from the control circuit and remain off until manually reset after the fire.
- A maintenance mode is provided. If Pump No.1 fails during operation, control can be switched to Pump No.2, and vice versa, ensuring that the Unit can continue operating with one pump while the other is under maintenance.
- The dimensions of the control cabinet, the electrical control principle and the main electrical components are specified in the company’s dedicated automatic control documentation.
Technical Performance Table
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No.
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Booster Unit Model
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Fire Pressure P1 (MPa)
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Vertical Diaphragm Pressure Tank
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Matched Pump
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Operating Weight (kg)
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Operating Pressure (MPa)
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Stabilizing Volume (L)
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Tank Model
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Pressure Ratio
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Fire Storage Volume (L)
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Pump Model
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Rated Volume
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Actual Volume
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1
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ZW(L)-I-X-7
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0.10
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SQL800×0.6
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0.60
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300
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319
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25LG3-10×4 1.5 kW
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1452
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P1=0.10 Ps1=0.26 P2=0.23 Ps2=0.31
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54
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| Note:
1. Operating pressure symbols: 2. Items No.1–6 are Type I Units, generally installed in high-level tank rooms (most unfavorable hydrant is lower than the Unit). 3. Items No.7–21 are Type II Units, generally installed in fire pump rooms or water tank rooms. The corresponding fire pressure ranges and matched pumps are for selection reference. 4. The listed pump models are based on Yongjia Haiyang Pump Factory products. Equivalent pumps from other manufacturers may be selected according to required flow and head. |
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OEM & Custom Solutions
Chaodun Pump provides OEM & ODM customization for W-HY fire pressure stabilizing systems, including control cabinet design, tank capacity, and pump selection. Our equipment supports hydrant and sprinkler combined configurations, tested under GB50045-95 and CECS76:95 standards for superior performance and reliability.
FAQs for Oversea Buyers
Q1: What is the W-HY Fire Pressure Boosting & Stabilizing Equipment used for?
It maintains steady firefighting pressure in hydrant and sprinkler systems for buildings and industrial facilities.
Q2: Can I customize the equipment design?
Yes, Yitie Pump offers OEM/ODM customization for pressure range, control panel, and pump configuration.
Q3: What are the main components?
The system includes a diaphragm air tank, booster pump, control cabinet, and monitoring instruments.
Q4: What’s the difference between I-type and II-type installation?
I-type is installed near high-level water tanks, II-type near fire pump rooms or reservoirs.
Q5: Does it meet international standards?
Yes, it conforms to GB50045-95 and CECS76:95 fire design codes.
Q6: Is the system suitable for both hydrant and sprinkler use?
Yes, combined models (XZ) support both systems simultaneously.
Q7: Can Yitie Pump provide certificates for export?
Yes, all exported units include compliance certificates, inspection reports, and technical documentation.