Product Description
Model Code Explanation
QHYX-DL fire pressure-boosting packaged water supply equipment (with XBD_DL vertical multistage fire pump) is a new type of tankless water supply system. It consists of three main parts: the pump unit, the control unit, and the pressure-boosting & pressure-stabilizing unit. The water supply capacity is determined by the pump unit, while coordinated operation of the system is controlled by the control unit. The pressure-boosting & stabilizing unit mainly serves to store energy and maintain pressure, handle small water consumption and normal pipeline leakage, and is also an indispensable part of automatic control. When a large amount of water is used and the network pressure drops, the pump starts automatically to supply water.
According to different operating modes, QHYX-DL fire pressure-boosting packaged water supply equipment (with XBD_DL vertical multistage fire pump) can be configured as an air-pressure water supply system or a variable-frequency water supply system, each with its own features. It is widely used in domestic water supply, fire-fighting systems, industrial water supply and sprinkler systems, among many other applications.
The pump is the foundation of the water supply system and the fundamental guarantee of its capacity. The pumps matched with the water supply equipment are general-purpose pumps and can be of various types with suitable flow rate and head. According to flow and head requirements, 1–4 or more pumps can operate in parallel. The pump unit, together with another pressure-boosting & stabilizing power unit (small-flow pump group), can switch with the main pump in the small-flow range to improve efficiency and further reduce energy consumption.
According to the operating mode, the equipment can be configured as domestic type, fire-fighting type, sprinkler type, or combined domestic & fire-fighting type.
Selection Basis
The basic criteria for selecting an automatic water supply system are the design flow rate and water supply pressure (head). In addition, the flow variation pattern of the intended application should be considered.
Continuous type: Flow is rarely zero during operation, or normal leakage in the pipe network itself maintains a certain minimum flow, such as booster systems for large hotels, restaurants and industrial/mining enterprises.
Intermittent type: The low-demand period is relatively long and the flow is very small or zero, such as in small office buildings, office towers, commercial–residential buildings, various residential buildings and some production water systems.
At the same time, it is necessary to consider flow variations during specific time periods, seasonal changes in water consumption and regional differences in water usage.
For fire sprinkler packaged systems, an air-pressure water supply system is generally recommended. Because the system normally remains in a pressure-maintaining state with almost no flow variation, the air-pressure system can handle normal pipeline leakage. With the addition of a small-flow auxiliary pump, the main pump does not need to start under normal conditions, which saves energy.
Advantages of variable-frequency water supply equipment: It can provide constant-pressure water supply, and the set pressure can be adjusted within a certain range. The constant-pressure accuracy is generally better than 0.02 MPa. Variable-frequency speed regulation is a highly efficient, energy-saving method. Compared with conventional air-pressure water supply systems, it can save about 20% energy on average. In addition, variable-frequency starting produces a small inrush current and low hydraulic impact on the pump, and the noise level is low during low-speed operation.
Advantages of air-pressure water supply equipment: It has relatively low investment cost, simple control technology, convenient service and easy maintenance.
Selection Guide
一、Selection of pumps for variable-frequency constant-pressure packaged equipment
| 1. Selection of water supply height for variable-frequency constant-pressure packaged equipment | ||||||||||
|
Equipment Head (m)
|
20
|
26
|
32
|
40
|
50
|
60
|
70
|
80
|
100
|
120
|
|
Water Supply Height (m)
|
10
|
14
|
18
|
25
|
32
|
38
|
46
|
55
|
72
|
88
|
| 2. Selection of number of service households for variable-frequency constant-pressure packaged equipment | ||||||
|
Equipment Flow (m³/h)
|
6
|
12
|
18
|
25
|
36
|
50
|
|
Number of Households
|
20–30
|
40–60
|
60–100
|
100–150
|
150–200
|
200–300
|
|
Equipment Flow (m³/h)
|
75
|
100
|
150
|
200
|
250
|
|
Number of Households
|
400–500
|
600–1000
|
1000–1500
|
1500–2000
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2000–3000
|
Performance Parameters
|
Applicable Buildings
|
Spray Flow (L/s)
|
Sprinkler Operating Pressure (MPa)
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Applicable Building Height (m)
|
Recommended Water Supply Model (Vertical Pump Group)
|
||
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Building Type
|
Design Spray Density (L/min·m²)
|
Coverage Area (m²)
|
||||
|
Industrial building
|
10
|
300
|
60
|
0.1
|
≤12
|
QHYX60-0.24-100XBD-DL-3
|
|
Industrial building
|
10
|
300
|
60
|
0.1
|
≤24
|
QHYX60-0.4-100XBD-DL-3
|
|
Industrial building
|
10
|
300
|
60
|
0.1
|
≤36
|
QHYX60-0.6-100XBD-DL-3
|
|
Industrial building
|
10
|
300
|
60
|
0.1
|
≤50
|
QHYX60-0.8-100XBD-DL-3
|
|
Industrial building
|
10
|
300
|
60
|
0.1
|
≤72
|
QHYX60-1.0-100XBD-DL-3
|
|
Industrial building
|
10
|
300
|
60
|
0.1
|
≤100
|
QHYX60-1.2-100XBD-DL-3
|
|
Storage building
|
15
|
300
|
90
|
0.1
|
≤12
|
QHYX90-0.24-150XBD-DL-3
|
|
Storage building
|
15
|
300
|
90
|
0.1
|
≤24
|
QHYX90-0.4-150XBD-DL-3
|
|
Storage building
|
15
|
300
|
90
|
0.1
|
≤36
|
QHYX90-0.6-150XBD-DL-3
|
|
Storage building
|
15
|
300
|
90
|
0.1
|
≤50
|
QHYX90-0.8-150XBD-DL-3
|
|
Storage building
|
15
|
300
|
90
|
0.1
|
≤72
|
QHYX90-1.0-150XBD-DL-3
|
|
Storage building
|
15
|
300
|
90
|
0.1
|
≤100
|
QHYX90-1.2-150XBD-DL-3
|
|
Ordinary hazard
|
6
|
300
|
40
|
0.1
|
≤12
|
QHYX40-0.24-100XBD-DL-3
|
|
Ordinary hazard
|
6
|
300
|
40
|
0.1
|
≤24
|
QHYX40-0.4-100XBD-DL-3
|
|
Ordinary hazard
|
6
|
300
|
40
|
0.1
|
≤36
|
QHYX40-0.6-100XBD-DL-3
|
|
Ordinary hazard
|
6
|
300
|
40
|
0.1
|
≤50
|
QHYX40-0.8-100XBD-DL-3
|
|
Ordinary hazard
|
6
|
300
|
40
|
0.1
|
≤72
|
QHYX40-1.0-100XBD-DL-3
|
|
Ordinary hazard
|
6
|
300
|
40
|
0.1
|
≤100
|
QHYX40-1.2-100XBD-DL-3
|
|
Light hazard
|
3
|
300
|
15
|
0.1
|
≤12
|
QHYX15-0.24-65XBD-DL-3
|
|
Light hazard
|
3
|
300
|
15
|
0.1
|
≤24
|
QHYX15-0.4-65XBD-DL-3
|
|
Light hazard
|
3
|
300
|
15
|
0.1
|
≤36
|
QHYX15-0.6-65XBD-DL-3
|
|
Light hazard
|
3
|
300
|
15
|
0.1
|
≤50
|
QHYX15-0.8-65XBD-DL-3
|
|
Light hazard
|
3
|
300
|
15
|
0.1
|
≤72
|
QHYX15-1.0-65XBD-DL-3
|
|
Light hazard
|
3
|
300
|
15
|
0.1
|
≤100
|
QHYX15-1.2-65XBD-DL-3
|
| Users can select appropriate models according to the parameters provided. | ||||||
General Description
一、The pressure-boosting and stabilizing equipment is a new type of fire booster & stabilizing system developed and designed in accordance with Document [1996] No.108 issued by the Ministry of Construction of the People’s Republic of China in August 1996, and it complies with drawing 98S205 (former 98S176).
二、This booster & stabilizing equipment is designed to solve situations in temporary high-pressure fire water supply systems where the installation height of the elevated fire water tank cannot meet the required static pressure at the most unfavorable point and booster facilities are therefore required. It is specially designed as dedicated fire booster & stabilizing equipment (hereinafter referred to as “the equipment”).
三、The equipment is applicable to fire hydrant water supply systems and wet automatic sprinkler systems in multi-storey and high-rise building projects requiring booster facilities, as well as various fire-fighting and domestic water supply systems.
四、The equipment consists of a WXQ air-pressure water tank, XBD-DL multistage fire hydrant pump, control cabinet, instruments and pipeline accessories.
五、The equipment is designed in accordance with the Code for Fire Protection Design of Tall Buildings (GB50045-95), the Code for Design of Air-Pressure Water Supply System and CECS76:95, and relevant technical parameters.
六、Design technical conditions for the equipment:
1. Working pressure of SQL air-pressure tank: 0.6 MPa, 1.0 MPa, 1.6 MPa.
2. Fire storage water volume of SQL air-pressure tank: greater than 150 L, 300 L, 450 L.
3. Stabilizing water volume of SQL air-pressure tank: greater than 50 L.
4. Pressure difference of buffer water volume: 0.02–0.03 MPa; pressure difference of stabilizing water volume: 0.05–0.06 MPa.
5. Working pressure ratio: a/b value within 0.6–40 ℃.
七、Operating principle of the equipment
The equipment must realize the following two functions:
1. Keep the most unfavorable point of the fire-fighting water supply pipeline system always at the required fire pressure.
2. Ensure that the air-pressure water tank always stores 30 seconds of fire water volume.
By using the operating pressures P1, P2, Ps1 and Ps2 set on the air-pressure tank, the pump operating conditions are controlled to achieve pressure boosting and pressure stabilizing. P1 is the required fire pressure at the most unfavorable point (MPa); P2 is the start pressure of the fire pump (MPa); Ps1 is the start pressure of the stabilizing pump (MPa); Ps2 is the stop pressure of the stabilizing pump (MPa).
八、Complete operating control process
The required fire pressure P1 at the most unfavorable point of the fire hydrant or automatic sprinkler system is calculated and taken as the inflation pressure of the air-pressure tank. Based on this, and the selected specifications and a/b value of the air-pressure tank, P2 is obtained and:
Ps1 = P2 + (0.02–0.03)
Ps2 = Ps1 + (0.05–0.06)
During normal conditions, if leakage causes pressure drop in the pipeline system, the stabilizing pump keeps replenishing water and maintaining pressure, operating repeatedly between Ps1 and Ps2 (start/stop). Once a fire occurs and water consumption increases sharply, Ps1 drops (Ps1 → Ps2). When 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 fire pump starts, the stabilizing pump stops automatically and will be restored to control only after the fire pump is stopped and manual reset is performed.
九、Classification of the equipment
According to installation position: upper-mounted type (I) and lower-mounted type (II).
According to tank arrangement: vertical type (L) and horizontal type (W).
According to the fire water supply system served: fire hydrant water supply system (X), automatic sprinkler system (Z), and combined hydrant & sprinkler fire water supply system (XZ).
十、Model designation
Example: ① ZW(L)—I—X—10—0.16
② ZW(W)—II—X—C
十一、Calculation of P1
P1 is the fire pressure required at the most unfavorable fire hydrant or sprinkler head in the fire water supply system. It is the minimum working pressure of the equipment and the basic parameter for selecting this equipment.
1. When the equipment is installed at the bottom level and draws water from a tank, P1 of the fire hydrant system is calculated as:
P1 = H1 + H2 + H3 + H4 (mH2O)
H1 – geometric height from the low water level of the tank to the most unfavorable hydrant (mH2O).
H2 – sum of friction and local pressure losses of the pipeline system (mH2O).
H3 – pressure loss in hose and hydrant itself (mH2O).
H4 – pressure required to obtain the effective jet length of the nozzle (mH2O).
2. When the equipment is installed at the high-level tank room and supplied by gravity from the tank, and the most unfavorable hydrant is lower than the equipment, P1 for the hydrant system is:
P1 = H3 + H4 (mH2O)
3. When the equipment is installed at the bottom level and draws water from a tank, P1 for the automatic sprinkler system is:
P1 = ∑H + Ho + Hr + Z (mH2O)
∑H – sum of friction and local pressure losses from the sprinkler pipes to the most unfavorable sprinkler head (mH2O).
Ho – operating pressure of the most unfavorable sprinkler head (mH2O).
Hr – local head loss at the alarm valve (mH2O).
Z – geometric height between the most unfavorable sprinkler head and the low water level of the tank (or supply main) (mH2O).
4. When the equipment is installed at the high-level tank room and supplied by gravity from the tank, and the most unfavorable sprinkler head is lower than the equipment, P1 for the automatic sprinkler system is:
P1 = ∑H + Ho + Hr + Z (mH2O)
5. When the air-pressure tank and the pump are installed at different locations, P1 shall be recalculated separately.
十二、Additional notes
1. Boosting standard: P1 is the minimum working pressure of the equipment and must meet the required fire pressure at the most unfavorable point of the fire water supply system. For hydrant systems, it must meet the requirement of effective jet length at the most unfavorable hydrant nozzle and cannot be determined only by a static pressure of 0.07 MPa or 0.15 MPa.
2. When calculating P1, the flow used for pipeline friction and local losses should be the fire water demand in the early stage of a fire; for hydrant systems this is usually two hydrant streams, 2×5 L/s = 10 L/s or 2×2.5 L/s = 5 L/s; for automatic sprinkler systems, it is the flow of five sprinkler heads, usually taken as 5×1 L/s = 5 L/s.
3. Main components: the air-pressure tank must provide the required fire storage water volume, stabilizing water volume and buffer water volume for the fire water supply system. Its diameter and size are determined by the a/b value. For hydrant systems, the storage volume of the air-pressure tank shall not be less than 300 L; for automatic sprinkler systems, not less than 150 L; for combined hydrant & sprinkler systems, not less than 450 L.
4. Two stabilizing pumps (one duty, one standby) are provided. The stabilizing pump flow shall be sufficient to replenish the actual stabilizing water volume in the air-pressure tank within 3 minutes. The pump head should be selected in the high-efficiency section of the pump curve at (Ps1 + Ps2)/2. The function of the equipment is to ensure that, in the early stage of a fire and before the main fire pump starts, there is a 30-second storage of water with sufficient fire pressure to fight the initial fire until the main fire pump reaches full load.
5. Fire hydrant systems and automatic sprinkler systems may share one set of booster & stabilizing equipment. When a fire occurs and tank pressure drops to P2, signals are sent to the fire control center or fire pump room. After confirming whether it is a hydrant system or a sprinkler system demand, the respective hydrant pump or sprinkler pump is started.
6. For hydrant systems, upper-mounted equipment is preferable to lower-mounted equipment. The upper-mounted arrangement allows a lower pump head because P1 only needs to overcome hose and nozzle losses and provide effective jet length. The inflation pressure of the air-pressure tank is lower, design pressure is reduced, and both steel consumption and operating costs are saved.
十三、电控性能 (Electrical control performance)
1. The control system of the equipment has both automatic and manual functions and can be networked with the fire control center or fire pump room.
2. The two stabilizing pumps are configured as duty/standby and operate alternately with automatic changeover.
3. Under normal conditions, the fire main is kept at high pressure and the tank stores a certain volume of water. When system pressure drops to Ps1 due to leakage, Pump No.1 starts automatically and stops when pressure rises to Ps2. Next time when pressure again drops to Ps1, Pump No.2 starts automatically. In this way, they alternately operate, maintaining system pressure between Ps1 and Ps2.
4. Once a fire occurs and pressure drops from Ps1 to Ps2, the system outputs a start signal for the main fire pump and an audible/visual alarm. After the main fire pump starts and returns a feedback signal, the control power of the stabilizing pumps is cut off. Manual reset is required afterwards to restore the control function.
5. The control system provides a special maintenance mode. If Pump No.1 fails in operation, it can be switched easily to Pump No.2; if Pump No.2 fails, it can be switched back to Pump No.1, so that the equipment can still operate normally while one pump is under maintenance.
6. For the size of the control cabinet, control principles and main components, refer to the company’s electrical automatic control manual.
十四、The diaphragm air-pressure water tank is manufactured according to national standard drawing set 91SS852.
十五、Piping adopts seamless steel pipe, hot-dip galvanized steel pipe or hot-dip galvanized seamless steel pipe.
十六、The equipment is supported by an integrated steel base. In this drawing set, the support form of the diaphragm air-pressure tank is skirt support, but saddle-type support can also be used.
十七、For upper-mounted equipment, vibration isolation measures shall be provided. When installing rubber vibration isolators under the pump unit, measures must be taken to prevent the pump unit from tipping over. After installing the vibration isolators, when installing inlet and outlet pipes, fittings and accessories, measures must be taken to prevent the pump unit from tilting, ensuring safe construction.
十八、The air-pressure tank is equipped with a drain device; safety valves, remote pressure gauges and other accessories shall be installed on the pipeline system.
十九、Drainage facilities shall be provided around the equipment to facilitate draining during maintenance or in case of accidental leakage.
二十、Sufficient clearance shall be provided between the equipment and walls or other equipment, generally not less than 700 mm.
二十一、The equipment shall undergo overall hydrostatic strength test and tightness test in accordance with current relevant standards.
二十二、The outer surfaces of connecting pipes, fittings and the air-pressure tank shall be coated with two coats of anti-rust paint. The inner surface of the air-pressure tank shall be coated with non-toxic anticorrosive paint.
二十三、Installation of pumps, motors and pipelines shall comply with relevant technical specifications.
二十四、Operation notes:
1. Before operation, initial commissioning (by the manufacturer) shall be performed. After commissioning, the air inlet of the pressure tank shall not be removed at will to avoid air leakage.
2. During operation, no full-time operator is required, but regular inspections are necessary.
二十五、The pumps configured in this equipment are based on the company’s XBD_DL vertical multistage fire pump, XBD-LG vertical multistage fire pump and XBD-ISG vertical single-stage fire pump series. If other pumps are adopted, they should be selected according to the flow and head requirements listed in the tables.
二十六、The electrical control part of this equipment may be designed with reference to the company’s electrical automatic control manual.
OEM & Custom Solutions
We provide OEM and ODM customization for all fire booster water supply equipment. Options include custom pressure control settings, panel design, and water pump configuration. Yitie Pump supports global distributors and contractors with reliable products and flexible engineering solutions.
FAQs for Oversea Buyers
Q1: What is the QHYX-DL Fire Booster Water Supply Equipment used for?
It is used for automatic pressure control and stable water supply in fire protection, domestic, and industrial systems.
Q2: Can I customize the system pressure or pump type?
Yes, Yitie Pump offers OEM customization for pressure, control systems, and pump models based on your requirements.
Q3: What are the main components of this equipment?
It includes a water pump unit, control system, and pressure stabilization tank for balanced operation.
Q4: Do you provide installation or technical support?
We provide installation guidance and after-sales technical support for overseas buyers.
Q5: What are the advantages of the variable frequency type?
It provides constant pressure control, energy savings up to 20%, and low noise operation.
Q6: What applications is it suitable for?
Ideal for firefighting, sprinkling systems, residential water supply, and industrial booster systems.
Q7: Can you provide samples or documentation?
Yes, datasheets and test reports can be provided for verification before bulk orders.