Product Description
Model Code Explanation
Product Overview
QHYX-GDL fire sprinkler water supply equipment (with XBD-GDL multistage fire hydrant pump) is a new type of tankless water supply system. It consists of three main parts: pump unit, control equipment and pressure boosting & pressure stabilizing unit. The water supply capacity is determined by the pump unit, the coordinated operation of the system is controlled by the control system, and the pressure boosting & stabilizing unit mainly serves to store energy and maintain pressure, cope with small water consumption and normal pipeline leakage, and is also an indispensable part of the automatic control function. When a large amount of water is required, the network pressure drops and the pump starts automatically to supply water.
QHYX-GDL fire sprinkler water supply equipment (with XBD-GDL multistage fire hydrant pump) can be divided into air-pressure water supply systems and variable-frequency water supply systems according to different operating modes, each with its own characteristics. It is widely used in domestic water, fire-fighting, industrial water, sprinkler systems and many other fields.
The pump is the foundation of the water supply equipment and the fundamental guarantee of its water supply capacity. The pumps matched with the water supply equipment are universal and can be any type of pump with suitable flow and head. According to the required flow and head, 1–4 or more pumps can be operated in parallel. The main pump unit is combined with another pressure boosting & stabilizing power supply unit (small-flow pump group) to switch with the main pump in the small-flow range, improving efficiency and further reducing energy consumption.
According to different operating modes, the equipment can be configured as domestic-type, fire-fighting-type, sprinkler-type and combined domestic & fire-fighting type.
Selection Basis
The basic basis for selecting an automatic water supply system is the design water supply flow rate and water supply pressure (head). In addition, the pattern of flow variation according to application should be considered.
Continuous type: during the day there is almost no time when the flow is zero, or the normal leakage of the pipe network itself maintains a certain flow. Typical examples include booster systems for large hotels, restaurants and industrial and mining enterprises.
Intermittent type: the low-demand period is long and the flow is very small or zero, such as small office buildings, office towers, commercial & residential buildings, various residential buildings and certain types of production water.
At the same time, it is also necessary to consider the variation of flow within a certain period of water supply, seasonal variations and regional differences in water consumption and other factors.
For fire sprinkler water supply equipment, an air-pressure water supply system is generally recommended, because the system is long-term in a pressure-maintaining state with no flow variation. Air-pressure water supply equipment can handle normal pipeline leakage, and with an additional small-flow auxiliary pump, the main pump does not need to start in daily operation, saving 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 pressure control accuracy is generally better than 0.02 MPa. Variable-frequency speed regulation is an efficient energy-saving method. Compared with conventional air-pressure water supply systems, it can save on average about 20% energy. In addition, variable-frequency starting produces low inrush current and low hydraulic impact on the pump, and noise is low during low-speed operation.
Advantages of air-pressure water supply equipment: relatively low investment cost, simple control technology, convenient service and easy maintenance.
Selection Guide
1. Selection of pumps for variable-frequency constant-pressure water supply equipment
| 1) Selection of water supply height for variable-frequency constant-pressure water supply 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 water supply equipment | ||||||
|
Equipment flow (m³/h)
|
6
|
12
|
18
|
25
|
36
|
50
|
|
Number of households served
|
20–30
|
40–60
|
60–100
|
100–150
|
150–200
|
200–300
|
|
Equipment flow (m³/h)
|
75
|
100
|
150
|
200
|
250
|
|
Number of households served
|
400–500
|
600–1000
|
1000–1500
|
1500–2000
|
2000–3000
|
Performance Parameters
|
Applicable buildings
|
Spray flow
(L/s) |
Sprinkler operating
pressure (MPa) |
Applicable building height
(m) |
Recommended packaged water supply model
Vertical pump set |
||
|
Building type
|
Design spray density
(L/min·m²) |
Coverage area
(m²) |
||||
|
Industrial (production) building
|
10
|
300
|
60
|
0.1
|
≤12
|
QHYX60-0.24-100 XBD-GDL-3
|
|
Industrial (production) building
|
10
|
300
|
60
|
0.1
|
≤24
|
QHYX60-0.4-100 XBD-GDL-3
|
|
Industrial (production) building
|
10
|
300
|
60
|
0.1
|
≤36
|
QHYX60-0.6-100 XBD-GDL-3
|
|
Industrial (production) building
|
10
|
300
|
60
|
0.1
|
≤50
|
QHYX60-0.8-100 XBD-GDL-3
|
|
Industrial (production) building
|
10
|
300
|
60
|
0.1
|
≤72
|
QHYX60-1.0-100 XBD-GDL-3
|
|
Industrial (production) building
|
10
|
300
|
60
|
0.1
|
≤100
|
QHYX60-1.2-100 XBD-GDL-3
|
|
Storage building
|
15
|
300
|
90
|
0.1
|
≤12
|
QHYX90-0.24-150 XBD-GDL-3
|
|
Storage building
|
15
|
300
|
90
|
0.1
|
≤24
|
QHYX90-0.4-150 XBD-GDL-3
|
|
Storage building
|
15
|
300
|
90
|
0.1
|
≤36
|
QHYX90-0.6-150 XBD-GDL-3
|
|
Storage building
|
15
|
300
|
90
|
0.1
|
≤50
|
QHYX90-0.8-150 XBD-GDL-3
|
|
Storage building
|
15
|
300
|
90
|
0.1
|
≤72
|
QHYX90-1.0-150 XBD-GDL-3
|
|
Storage building
|
15
|
300
|
90
|
0.1
|
≤100
|
QHYX90-1.2-150 XBD-GDL-3
|
|
Ordinary hazard
|
6
|
300
|
40
|
0.1
|
≤12
|
QHYX40-0.24-100 XBD-GDL-3
|
|
Ordinary hazard
|
6
|
300
|
40
|
0.1
|
≤24
|
QHYX40-0.4-100 XBD-GDL-3
|
|
Ordinary hazard
|
6
|
300
|
40
|
0.1
|
≤36
|
QHYX40-0.6-100 XBD-GDL-3
|
|
Ordinary hazard
|
6
|
300
|
40
|
0.1
|
≤50
|
QHYX40-0.8-100 XBD-GDL-3
|
|
Ordinary hazard
|
6
|
300
|
40
|
0.1
|
≤72
|
QHYX40-1.0-100 XBD-GDL-3
|
|
Ordinary hazard
|
6
|
300
|
40
|
0.1
|
≤100
|
QHYX40-1.2-100 XBD-GDL-3
|
|
Light hazard
|
3
|
300
|
15
|
0.1
|
≤12
|
QHYX15-0.24-65 XBD-GDL-3
|
|
Light hazard
|
3
|
300
|
15
|
0.1
|
≤24
|
QHYX15-0.4-65 XBD-GDL-3
|
|
Light hazard
|
3
|
300
|
15
|
0.1
|
≤36
|
QHYX15-0.6-65 XBD-GDL-3
|
|
Light hazard
|
3
|
300
|
15
|
0.1
|
≤50
|
QHYX15-0.8-65 XBD-GDL-3
|
|
Light hazard
|
3
|
300
|
15
|
0.1
|
≤72
|
QHYX15-1.0-65 XBD-GDL-3
|
|
Light hazard
|
3
|
300
|
15
|
0.1
|
≤100
|
QHYX15-1.2-65 XBD-GDL-3
|
| Users can select suitable models according to the parameters provided above. | ||||||
General Description
1. The pressure boosting and pressure stabilizing equipment is a new type of fire booster & stabilizing system developed and designed in accordance with Document [1996] No.108 of the Ministry of Construction of the People’s Republic of China (issued in August 1996), and also complies with drawing 98S205 (former 98S176).
2. This booster & stabilizing equipment is specially designed to solve situations where, in a temporary high-pressure fire water supply system, the installation height of the elevated fire water tank cannot meet the required static water pressure at the most unfavorable point of the system, and therefore additional booster facilities must be provided. It is specially designed as fire-dedicated booster & stabilizing equipment (hereinafter referred to as “the equipment”).
3. The equipment is applicable to fire hydrant water supply systems and wet automatic sprinkler systems in multi-storey and high-rise building projects that require booster facilities, as well as various fire-fighting and domestic water supply systems.
4. The equipment consists of SQL diaphragm-type air-pressure tank, XBD-GDL multistage fire hydrant pump, control panel, instruments and pipeline accessories.
5. The equipment is designed in accordance with the “Code for Fire Protection Design of Tall Buildings” (GB50045-95) and the “Code for Design of Air-Pressure Water Supply System” CECS76:95 and related technical parameters.
6. Relevant design technical conditions for this equipment:
1) Working pressure of SQL air-pressure water tank: 0.6 MPa, 1.0 MPa, 1.6 MPa.
2) Fire storage water volume of SQL air-pressure water tank: greater than 150 L, 300 L, 450 L.
3) Stabilizing water volume of SQL air-pressure water tank: greater than 50 L.
4) Pressure difference of buffer water volume in SQL air-pressure water tank: 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 ℃.
7. Operating principle of the equipment
The equipment must realize the following two functions:
1) Keep the most unfavorable point of the fire 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 means of 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 pressure-stabilizing pump (MPa), and Ps2 is the stop pressure of the pressure-stabilizing pump (MPa).
8. Complete operating control process
According to calculation, the required fire pressure P1 at the most unfavorable point of the fire hydrant system or automatic sprinkler system is obtained and taken as the inflation pressure of the air-pressure water tank.
Based on this, together with the selected specifications and a/b value of the air-pressure tank, P2 is calculated, and:
Ps1 = P2 + (0.02–0.03)
Ps2 = Ps1 + (0.05–0.06)
During normal operation, if there is leakage causing pressure drop in the pipeline system, the pressure-stabilizing pump will keep replenishing water and maintaining pressure, repeatedly operating between Ps1 and Ps2 (start/stop). Once a fire occurs and the system water consumption increases sharply, pressure at Ps1 drops (Ps1 → Ps2). When it falls to P2, an alarm signal is generated and the fire pump starts immediately (manual or automatic start as determined by the designer). After the fire pump starts, the stabilizing pump will stop automatically, and the equipment control function will be restored manually only after the fire pump stops.
9. Equipment classification:
According to installation location: upper-mounted type (I) and lower-mounted type (II);
According to tank arrangement: vertical (L) and horizontal (W);
According to type of fire water supply system served: fire hydrant water supply system (X), automatic sprinkler system (Z), and combined fire hydrant & sprinkler fire water supply system (XZ).
10. Equipment model designation:
Example: ① ZW(L)—I—X—10—0.16
② ZW(W)—II—X—C
11. Calculation of P1:
P1 is the fire pressure required at the most unfavorable fire hydrant or sprinkler head of 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 water 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 fire 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 achieve 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 fire hydrant is lower than the equipment, the fire hydrant system P1 is calculated as:
P1 = H3 + H4 (mH2O)
3) When the equipment is installed at the bottom level and draws water from a tank, P1 of the automatic sprinkler system is calculated as:
P1 = ∑H + Ho + Hr + Z (mH2O)
∑H – sum of friction and local pressure losses from sprinkler pipes to the most unfavorable sprinkler head (mH2O);
Ho – operating pressure of the most unfavorable sprinkler head (mH2O);
Hr – local head loss of 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, the automatic sprinkler system P1 is also calculated as:
P1 = ∑H + Ho + Hr + Z (mH2O)
5) When the air-pressure water tank and the pump are installed at different locations, P1 should be recalculated separately.
12. Additional notes:
1) Pressure 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 fire hydrant systems, it must meet the requirement of effective jet length of 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 friction and local loss of the pipeline system should be the fire water flow in the early stage of fire, such as two fire hydrant streams of 2×5 L/s = 10 L/s or 2×2.5 L/s = 5 L/s for hydrant systems, and 5 sprinkler heads of 5×1 L/s = 5 L/s for automatic sprinkler systems.
3) Main components: the air-pressure water tank must provide the required fire storage water volume, stabilizing water volume and buffer water volume of the fire water supply system. Its diameter and size are determined by the a/b value. For hydrant systems, 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 pressure-stabilizing pumps (one duty, one standby) are provided. The stabilizing pump flow shall be able to replenish the actual stabilizing water volume in the air-pressure water tank within 3 minutes. The stabilizing pump head should be selected in the high-efficiency area of the pump curve at (Ps1 + Ps2)/2. The function of the equipment is to ensure a 30-second fire water storage with sufficient pressure in the early stage of a fire, before the main fire pump starts and 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, the system sends signals to the fire control center or fire pump room. After confirmation, the fire hydrant pump or sprinkler pump is started accordingly.
6) In fire hydrant systems, upper-mounted equipment is preferred to lower-mounted. The upper-mounted type requires lower pump head because P1 only needs to overcome hose and nozzle losses and provide effective jet length. The air-pressure tank inflation pressure is lower, with lower design pressure, saving steel consumption and operating costs.
13. Electrical control performance:
1) The control system has both automatic and manual functions and can be networked with the fire control center or fire pump room.
2) 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 drops to Ps1 again, Pump No.2 will start automatically. They alternately operate so that system pressure is always maintained between Ps1 and Ps2.
4) Once a fire occurs and system pressure drops from Ps1 to Ps2, a start signal and audible/visual alarm for the main fire pump are generated. 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 maintenance mode. If Pump No.1 fails during operation, Pump No.2 can be easily switched on. If Pump No.2 fails, Pump No.1 can be enabled 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.
14. Diaphragm air-pressure water tanks are manufactured according to national standard drawing set 91SS852.
15. Piping uses seamless steel pipe, hot-dip galvanized steel pipe or hot-dip galvanized seamless steel pipe.
16. The equipment is supported by an integrated steel base. The support form of the diaphragm air-pressure tank in this drawing set is skirt support, but saddle-type support can also be used.
17. 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 to ensure safe construction.
18. 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.
19. Drainage facilities shall be provided around the equipment for draining water during maintenance or in case of accidental leakage.
20. Sufficient clearance shall be provided between the equipment and walls or other equipment, generally not less than 700 mm.
21. The equipment shall undergo overall hydrostatic strength test and tightness test in accordance with current relevant standards.
22. The outer surface of connecting pipes, fittings and air-pressure tank shall be coated with two coats of anti-rust paint. The internal surface of the air-pressure tank shall be coated with non-toxic anticorrosive paint.
23. Installation of pumps, motors and pipelines shall comply with relevant technical specifications.
24. 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 inspection is necessary.
25. The pumps configured in this equipment are based on the company’s XBD_DL vertical multistage fire pump / XBD-LG vertical multistage fire pump / XBD-ISG vertical single-stage fire pump series. When other pumps are adopted, they should be selected according to the flow and head requirements listed in the tables.
26. The electrical control part of this equipment can be designed with reference to the company’s electrical automatic control manual.
OEM & Custom Solutions
Chaodun Pump offers complete OEM and ODM customization for firefighting sprinkler water systems. We provide options for pump configurations, control cabinet design, and pressure settings to suit various regional standards. All equipment undergoes strict testing to ensure reliability and durability under emergency operation.
FAQs for Oversea Buyers
Q1: What is the QHYX-GDL Fire Sprinkler Water Supply Equipment used for?
It is used for automatic water supply and pressure control in firefighting sprinkler and building safety systems.
Q2: Can I customize the pressure or pump specifications?
Yes, Chaodun Pump provides OEM/ODM customization for flow rate, pressure, and control configurations.
Q3: What components are included in the system?
The equipment includes multistage pump units, control panels, and a pressure stabilization tank for reliable operation.
Q4: What is the benefit of variable frequency control?
It maintains precise constant pressure, reduces energy consumption, and ensures smooth startup with low noise.
Q5: What’s the difference between air pressure and variable frequency types?
Air pressure systems are simpler and more cost-effective, while variable frequency types offer higher precision and energy savings.
Q6: Is it suitable for non-fire applications?
Yes, it can also be used for residential, industrial, and irrigation water supply systems.
Q7: Do you provide export certificates or performance test data?
Yes, we supply all necessary documentation, certificates, and testing reports for international projects.