Product Description
Model Code Explanation
Product Introduction
1. The W*/*-HY fire booster and pressure-stabilizing water supply unit is a newly developed pressure boosting and stabilization system, designed in accordance with the Ministry of Construction document [1996] No.108 (August 1996, P.R. China), and in full compliance with specification 98S205 (formerly 98S176).
2. This booster and pressure-stabilizing unit is designed to solve the case where the elevation of the high-level fire water tank in a temporary high-pressure fire water supply system cannot meet the required static pressure at the most unfavorable point and therefore requires additional boosting equipment. It is a dedicated fire booster and pressure-stabilizing unit (hereinafter referred to as the “unit”).
3. The unit is suitable for multi-storey and high-rise building projects where booster facilities are required for fire hydrant water supply systems and wet pipe automatic sprinkler systems, as well as for other fire water supply and domestic water supply systems.
4. The unit consists of a diaphragm-type pressure tank, jockey (pressure-stabilizing) pump, control panel, instruments, and associated piping and fittings.
5. The unit is designed based on the relevant technical parameters specified in the “Code for Fire Protection Design of High-Rise Civil Buildings” GB50045-95 (hereinafter referred to as “High-Rise Code”) and the “Code for Design of Pneumatic Water Supply Systems” CECS76:95.
Structure Diagram
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Operation Control Process
Based on calculations, determine the required fire pressure P1 at the most unfavorable point of the fire hydrant system or automatic sprinkler system. Take P1 as the pre-charge pressure of the pressure tank. According to the selected diaphragm pressure tank model and the working pressure ratio a/b, calculate the corresponding P2 and set:
Ps1 = P2 + (0.02~0.03)
Ps2 = Ps1 + (0.05~0.06)
In normal conditions, if there is leakage or minor pressure drop in the pipe network, the XBD-L jockey (pressure-stabilizing) pump automatically makes up water and stabilizes pressure, cycling between Ps1 and Ps2 (start/stop).
Once a fire occurs, a large amount of water is discharged from the pipe network, causing the pressure to fall rapidly from Ps1 toward Ps2 and down to P2. When the pressure drops to P2, an alarm signal is generated and the fire pump is started immediately (manual or automatic start as determined by the designer). After the XBD-L vertical single-stage fire pump starts, the XBD-HY jockey pump is automatically stopped, and remains off until the XBD-LG vertical multistage fire pump is stopped and the control of the “unit” is restored manually.
Equipment Classification
According to installation location:
– Type I (I): unit installed in an upper location (e.g. high-level tank room).
– Type II (II): unit installed in a lower location (e.g. pump room).
According to pressure tank orientation:
– L: Vertical diaphragm pressure tank.
– W: Horizontal diaphragm pressure tank.
According to service system:
– X: Fire hydrant water supply system.
– Z: Automatic sprinkler system.
– XZ: Combined fire hydrant and automatic sprinkler water supply system.
Technical Conditions
1. SQL diaphragm pressure tank working pressures: 0.6 MPa, 1.0 MPa, 1.6 MPa.
2. SQL diaphragm pressure tank minimum fire storage volume: 150 L, 300 L, 450 L.
3. SQL diaphragm pressure tank minimum pressure-stabilizing water volume: 50 L.
4. For the SQL diaphragm pressure tank, the buffer water volume corresponds to a pressure differential of 0.02~0.03 MPa; the pressure-stabilizing water volume corresponds to a pressure differential of 0.05~0.06 MPa.
5. Working pressure ratio: a/b. Ambient temperature range: 0~40°C.
Service Conditions
1. Fire hydrant system: nozzle flow per jet 2.5 L/s or 5 L/s, with effective jet lengths of 7 m, 10 m, and 13 m.
2. Automatic sprinkler system: flow rate per sprinkler 1.0 L/s, sprinkler operating pressure 0.1 MPa.
3. Ambient temperature for the unit: 5°C~40°C.
Working Principle
1. Ensure that the most unfavorable point in the fire water supply system always maintains the required fire pressure.
2. Ensure that the WSQL diaphragm pressure tank always stores at least 30 seconds of fire water volume. By using the set pressures P1, P2, Ps1 and Ps2 of the pressure tank, the operating condition of the pumps is controlled to achieve both boosting and pressure stabilization.
P1: required fire pressure (MPa) at the most unfavorable point.
P2: fire pump start pressure (MPa).
Ps1: jockey pump start pressure (MPa).
Ps2: jockey pump stop pressure (MPa).
Calculation of P1
P1 is the required fire pressure at the most unfavorable fire hydrant or sprinkler in the fire water supply system. It is the minimum operating pressure of the unit and is the basic design parameter for selecting the unit.
1. When the unit is installed at the lowest floor, drawing water from a reservoir, for a fire hydrant system:
P1 = H1 + H2 + H3 + H4 (mH2O)
H1 — Geodetic height from the lowest water level in the reservoir to the most unfavorable fire hydrant (mH2O).
H2 — Sum of friction loss and local loss in the pipe system (mH2O).
H3 — Pressure loss in the hose and the fire hydrant itself (mH2O).
H4 — Pressure required to achieve the effective jet length of the nozzle (mH2O).
2. When the unit is installed in the high-level tank room, drawing water by gravity from the high-level tank, and the most unfavorable fire hydrant is lower than the unit, the fire hydrant system calculation is:
P1 = H3 + H4 (mH2O)
3. When the unit is installed at the lowest floor, drawing water from a reservoir, for an automatic sprinkler system:
P1 = ∑H + Ho + Hr + Z (mH2O) >
∑H — Sum of friction and local pressure losses in the sprinkler piping 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 — Geodetic height between the most unfavorable sprinkler and the lowest water level in the reservoir (or supply main) (mH2O).
4. When the unit is installed in the high-level tank room, drawing water by gravity from the tank, and the most unfavorable sprinkler is below the unit, the automatic sprinkler system calculation is:
P1 = ∑H + Ho + Hr + Z (mH2O) >
5. When the pressure tank and pump are installed at different locations, P1 shall be recalculated according to the actual arrangement.
Equipment Description
1. Boosting standard of the unit: P1 is the minimum operating pressure of the unit and must satisfy the required fire pressure at the most unfavorable point of the system. For a fire hydrant system, P1 must ensure the effective jet length of the nozzle at the most unfavorable hydrant, rather than simply meeting a static pressure of 0.07 MPa or 0.15 MPa.
2. When calculating P1, the flow used for friction and local loss calculations in the pipe system should be the initial fire-fighting flow. For example, for a hydrant system, use two hydrant flows: 2×5 L/s = 10 L/s or 2×2.5 L/s = 5 L/s; for an automatic sprinkler system, use the flow of five sprinklers, typically 5×1 L/s = 5 L/s.
3. Main components of the unit: the diaphragm pressure tank must provide the required fire storage volume, pressure-stabilizing volume, and buffer volume for the fire water supply system. According to the selected a/b value, determine the tank diameter and model.
– For fire hydrant systems, the pressure tank fire storage volume shall not be less than 300 L.
– For automatic sprinkler systems, not less than 150 L.
– For combined hydrant and automatic sprinkler systems, not less than 450 L.
4. The unit is equipped with two jockey pumps (one duty, one standby). The jockey pump capacity must be sufficient to replenish the actual pressure-stabilizing water volume in the WXQ diaphragm pressure tank within 3 minutes. The jockey pump head should be selected based on the average of (Ps1 + Ps2)/2 in the high-efficiency region of the pump curve. The function of the unit is to ensure a 30-second fire water storage at adequate pressure in the initial fire stage, before the main fire pump is fully in service.
5. Fire hydrant systems and automatic sprinkler systems can share a single booster and pressure-stabilizing unit. When a fire occurs and the pressure in the pressure tank drops to P2, the unit outputs signals to the fire control center or fire pump room, which then confirm and respectively start the fire hydrant pump or sprinkler pump.
6. For fire hydrant systems, a Type I (upper installation) unit is preferable to a Type II (lower installation) unit. With a Type I unit, the required pump head is lower. P1 mainly accounts for hose and nozzle losses plus the pressure required for the effective jet length. The tank pre-charge pressure is lower, the design pressure of the tank is reduced, and both steel consumption and operating costs are saved.
Electrical Control Functions
1. The electrical control system of the unit provides both automatic and manual modes and can be networked with the fire control center or fire pump room.
2. Two jockey pumps are configured (one duty, one standby), with automatic duty/standby changeover and alternate operation.
3. Under normal conditions, the fire pipe network is kept at high pressure and the tank maintains a certain storage volume. When system pressure drops to Ps1 due to leakage, Pump No.1 starts automatically and stops at Ps2. Next time the pressure drops to Ps1, Pump No.2 starts automatically. In this way, the system pressure is always maintained between Ps1 and Ps2.
4. When a fire occurs, the system pressure drops from Ps1 to Ps2, at which point a start signal for the main fire pump and an audible/visual alarm are output. After the main fire pump starts and its feedback signal is received, the control power of the jockey pumps is cut off. Subsequent recovery of the jockey pump control is by manual reset.
5. The control system has a maintenance mode. If Pump No.1 fails during operation, control can be switched to Pump No.2, and vice versa. Thus, even when one pump is under maintenance, the unit can continue to operate normally.
6. For details of the control panel dimensions, control schematic and main components, refer to the company’s dedicated automatic control documentation.
Technical Characteristics Table
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No.
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Booster & Pressure-Stabilizing 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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Pressure-Stabilizing Volume (L)
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Tank Model
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Working 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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Effective Volume
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1
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ZW(L)-I-X-7
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0.1
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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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2
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ZW(L)-I-Z-10
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0.16
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SQL800*0.6
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0.80
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150
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159
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25LG3-10*4 1.5 kW
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1428
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P1=0.16 Ps1=0.26 P2=0.23 Ps2=0.31
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70
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3
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ZW(L)-I-X-10
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0.16
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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*5 1.5 kW
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1474
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P1=0.16 Ps1=0.36 P2=0.33 Ps2=0.42
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52
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4
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ZW(L)-I-X-13
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0.22
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SQL1000*0.6
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0.76
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300
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329
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25LG3-10*4 1.5 kW
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2312
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P1=0.22 Ps1=0.35 P2=0.32 Ps2=0.40
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97
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5
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ZW(L)-XZ-10
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0.16
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SQL1000*0.6
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0.65
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450
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480
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25LG3-10*4 1.5 kW
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2312
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P1=0.16 Ps1=0.33 P2=0.30 Ps2=0.38
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86
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6
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ZW(L)-XZ-13
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0.22
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SQL1000*0.6
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0.67
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450
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452
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25LG3-10*5 1.5 kW
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2312
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P1=0.22 Ps1=0.41 P2=0.38 Ps2=0.46
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80
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7
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ZW(L)-II-Z-
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A
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0.22-0.38
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SQL800*0.6
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0.80
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150
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159
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25LG3-10*6 2.2 kW
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1452
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P1=0.38 Ps1=0.53 P2=0.50 Ps2=0.60
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61
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8
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ZW(L)-II-Z-
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B
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0.38-0.50
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SQL800*1.0
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0.80
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150
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159
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25LG3-10*8 2.2 kW
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1513
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P1=0.50 Ps1=0.68 P2=0.65 Ps2=0.75
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51
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9
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ZW(L)-II-Z-
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C
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0.50-0.65
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SQL1000*1.6
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0.85
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150
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206
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25LG3-10*9 2.2 kW
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1653
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P1=0.65 Ps1=0.81 P2=0.78 Ps2=0.86
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59
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10
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ZW(L)-II-Z-
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D
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0.65-0.85
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SQL1000*1.6
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0.85
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150
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206
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25LG3-10*11 3 kW
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1701
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P1=0.85 Ps1=1.04 P2=1.02 Ps2=1.10
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57
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11
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ZW(L)-II-Z-
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E
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0.85-1.00
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SQL1000*1.6
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0.85
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150
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206
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25LG3-10*13 4 kW
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1709
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P1=1.00 Ps1=1.21 P2=1.19 Ps2=1.27
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50
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No.
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Booster & Pressure-Stabilizing 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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Pressure-Stabilizing Volume (L)
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Tank Model
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Working 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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Effective Volume
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12
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ZW(L)-II-X-
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A
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0.22-0.38
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SQL1000*0.6
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0.78
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300
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302
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25LG3-10*6 2.2 kW
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2344
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P1=0.38 Ps1=0.55 P2=0.52 Ps2=0.60
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72
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13
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ZW(L)-II-X-
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B
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0.38-0.50
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SQL1000*1.0
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0.78
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300
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302
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25LG3-10*8 2.2 kW
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2494
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P1=0.50 Ps1=0.70 P2=0.67 Ps2=0.75
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61
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14
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ZW(L)-II-X-
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C
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0.50-0.65
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SQL1000*1.6
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0.78
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300
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302
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25LG3-10*10 3 kW
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2689
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P1=0.65 Ps1=0.88 P2=0.86 Ps2=0.93
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51
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15
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ZW(L)-II-X-
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D
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0.65-0.85
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SQL1000*1.6
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0.85
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300
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355
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25LG3-10*13 4 kW
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2703
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P1=0.85 Ps1=1.05 P2=1.02 Ps2=1.10
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82
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16
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ZW(L)-II-X-
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E
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0.85-1.00
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SQL1000*1.6
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0.88
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300
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355
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25LG3-10*15 4 kW
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2730
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P1=1.00 Ps1=1.21 P2=1.19 Ps2=1.26
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73
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17
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ZW(L)-II-XZ-
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A
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0.22-0.38
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SQL1200*0.6
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0.80
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450
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474
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25LG3-10*6 2.2 kW
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3641
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P1=0.38 Ps1=0.53 P2=0.50 Ps2=0.58
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133
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18
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ZW(L)-II-XZ-
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B
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0.38-0.50
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SQL1200*1.0
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0.80
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450
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474
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25LG3-10*8 2.2 kW
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3947
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P1=0.50 Ps1=0.68 P2=0.65 Ps2=0.73
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110
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19
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ZW(L)-II-XZ-
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C
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0.50-0.65
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SQL1200*1.6
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0.80
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450
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474
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25LG3-10*10 3 kW
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3961
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P1=0.65 Ps1=0.87 P2=0.84 Ps2=0.92
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90
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20
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ZW(L)-II-XZ-
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D
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0.65-0.85
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SQL1200*1.6
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0.80
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450
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474
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25LG3-10*12 4 kW
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4124
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P1=0.85 Ps1=1.12 P2=1.09 Ps2=1.17
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73
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21
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ZW(L)-II-XZ-
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E
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0.85-1.00
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SQL1200*1.6
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0.80
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450
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474
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25LG3-10*14 4 kW
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4156
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P1=1.00 Ps1=1.30 P2=1.27 Ps2=1.35
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64
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| Note: 1. Operating pressure symbols in the table: P1 — pre-charge pressure of the pressure tank (required fire pressure) (MPa). P2 — fire pump start pressure (MPa). Ps1 — booster/jockey pump start pressure (MPa). Ps2 — booster/jockey pump stop pressure (MPa). 2. Items No.1–6 are Type I units, typically installed in a high-level tank room (with the most unfavorable hydrant below the unit). 3. Items No.7–21 are Type II units, typically installed in the fire pump room or reservoir room; the fire pressure range and matched pumps shown are for selection reference. 4. The pump models listed are those of Yongjia Haiyang Pump Factory; other pumps with equivalent flow and head may be selected as required. |
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OEM & Custom Solutions
Chaodun Pump offers OEM and ODM customization for W-HY fire pressure stabilizing systems, including tank capacity, pressure range, and control configuration. All products are factory tested, CE-certified, and meet ISO9001 standards for export use.
FAQs for Oversea Buyers
Q1: What is the W-HY Fire Pressure Boosting & Stabilizing Equipment used for?
It maintains steady pressure in hydrant and sprinkler systems, ensuring reliable fire protection.
Q2: Can it operate automatically?
Yes, it uses pressure sensors to control automatic pump start/stop cycles.
Q3: What’s the difference between I-type and II-type?
I-type is installed near upper tanks, II-type near pump rooms or reservoirs.
Q4: Is customization available?
Yes, we offer OEM solutions for flow, head, and control system design.
Q5: What certifications does it have?
GB50045-95, CECS76:95, ISO9001, and CE export certifications.
Q6: What is the lifespan of the diaphragm air tank?
Over 10 years with minimal maintenance.
Q7: Does Yitie Pump provide installation guidance?
Yes, full documentation, installation diagrams, and remote support are available.