Product Overview
The QHYX-DL Firefighting Pressure Boosting Packaged Water Supply System (equipped with an XBD_DL vertical multistage fire pump) is a tankless water supply solution for firefighting pressure boosting and pressure stabilization. The system integrates a pump unit, a control unit, and a boosting & stabilizing unit coordinated by automatic control logic. The stabilization device compensates for small-demand draw-off and normal pipeline leakage; when large-demand events cause a pressure drop in the network, the pump set starts automatically to ensure continuous and reliable water supply.
Model Designation
Key Features
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Tankless packaged design with fast response.
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Configurable as an Air-pressure Water Supply System or a Variable-frequency Water Supply System to match operating requirements.
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Multi-pump parallel operation: 1–4 pumps (or more) can run simultaneously to meet different flow and head demands.
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Coordinated/alternating operation between the main pump and the low-flow jockey (pressure-stabilizing) pump reduces frequent main-pump cycling, improves efficiency, and reduces energy consumption and mechanical wear.
Engineering Summary
Designed for firefighting boosting and pressure stabilization, the system can be configured as an air-pressure or variable-frequency water supply system. By coordinating the main pump and the low-flow jockey pump, it maintains stable pressure under low-demand conditions and responds rapidly under high-demand scenarios, meeting engineering requirements for continuity and automation in firefighting water supply.
Applications
Applicable to:
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Firefighting water supply and sprinkler systems
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Domestic (building) water supply systems
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Industrial water supply systems
System Configuration
Components
The system mainly consists of:
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Pump unit (XBD_DL vertical multistage fire pump)
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Control unit
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Pressure boosting and pressure stabilizing device
Design Basis
The system is configured and coordinated based on the engineering requirements of firefighting pressure boosting and stabilization. Water supply capacity is determined by the pump set. The boosting/stabilizing device stores hydraulic energy and maintains network pressure to compensate for small-demand usage and normal leakage, and it works with automatic pump starting to ensure continuous water supply when large-demand events cause pressure drop.
Selection & Operating Principles
Demand Applications
Selection of an automatic water supply system should be based on:
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Design flow rate
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Required supply pressure (head)
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Flow variation profile (continuous or intermittent operation)
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Supply period variations, seasonal water demand changes, and regional demand differences
Intermittent Demand Applications
During normal low-flow or pressure-maintenance operation, the system maintains network pressure via the stabilization device and low-flow jockey pump. When sudden high-flow demand occurs, the main pump starts automatically to ensure supply continuity and rapid response.
Operating Principles
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Water supply capacity is determined by the pump set.
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The boosting/stabilizing device stores hydraulic energy and maintains network pressure, compensating for low-flow draw-off and normal leakage.
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When high-demand events cause network pressure drop, the system starts the pump set automatically to maintain continuous supply.
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Alternating operation between the main pump and the low-flow jockey pump within the low-flow range reduces frequent main-pump start/stop cycling, improves efficiency, and lowers energy consumption—well suited for long-term continuous operation.
Pumps
Unit Description
The system adopts a multi-pump parallel configuration. Depending on the design flow rate and required head, 1–4 pumps (or more) can operate simultaneously. Within the low-flow range, the main pump and the low-flow jockey pump operate alternately to reduce main-pump cycling and improve overall efficiency.
Pneumatic Pumps
In air-pressure mode, the boosting and stabilizing device stores hydraulic energy and maintains network pressure to achieve low-flow compensation and pressure stabilization. When large-demand conditions cause a pressure drop, it works with automatic pump starting to ensure continuous and reliable supply.
Technical Service
Technical Specifications
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Variable-frequency operation: pressure control accuracy is typically better than 0.02 MPa, with energy-saving performance.
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Air-pressure operation: relatively lower initial investment, simpler control logic, and convenient operation and maintenance.
Service Conditions
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When a large demand causes a drop in pipeline network pressure, the pump will start automatically to ensure continuous and reliable water supply.
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The system maintains stable pressure under low-demand conditions and responds rapidly under high-demand scenarios, meeting engineering requirements for supply continuity and automation in fire protection systems.
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The main pump and the low-flow pressure stabilizing pump operate alternately within the low-flow range, effectively reducing frequent start/stop cycling of the main pump, improving overall system efficiency, and lowering energy consumption. This configuration is well-suited for long-term continuous operation.
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Air-pressure and variable-frequency water supply modes are supported. The system can be configured as an air-pressure water supply system or a variable-frequency water supply system based on operating requirements.
Environmental Requirements
The system is intended for both low-demand pressure-maintenance duty and high-demand rapid-response duty, suitable for long-term continuous operation. Configuration can be selected between air-pressure and variable-frequency modes according to operating requirements.
Electrical Control Functions
The control unit coordinates the pump unit and the boosting/stabilizing device through automatic control logic. The pump set starts automatically when network pressure drops or high-flow demand occurs. Within the low-flow range, coordinated/alternating operation between the main pump and the low-flow jockey pump reduces manual intervention and maintains stable long-term operation.
Operating Instructions
During normal low-flow or pressure-maintenance operation, the system maintains network pressure. When sudden high-flow demand causes a pressure drop, the main pump starts automatically to ensure continuous supply and fast system response.
Installation & Dimensions
Performance Data
一、Selection of pumps for variable-frequency constant-pressure packaged equipment
| 1. Selection of water supply height for variable-frequency constant-pressure packaged equipment | ||||||||||
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Equipment Head (m)
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20
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26
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32
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40
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50
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60
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70
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80
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100
|
120
|
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Water Supply Height (m)
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10
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14
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18
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25
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32
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38
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46
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55
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72
|
88
|
| 2. Selection of number of service households for variable-frequency constant-pressure packaged equipment | ||||||
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Equipment Flow (m³/h)
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6
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12
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18
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25
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36
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50
|
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Number of Households
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20–30
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40–60
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60–100
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100–150
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150–200
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200–300
|
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Equipment Flow (m³/h)
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75
|
100
|
150
|
200
|
250
|
|
Number of Households
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400–500
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600–1000
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1000–1500
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1500–2000
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2000–3000
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Performance Parameters
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Applicable Buildings
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Spray Flow (L/s)
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Sprinkler Operating Pressure (MPa)
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Applicable Building Height (m)
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Recommended Water Supply Model (Vertical Pump Group)
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Building Type
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Design Spray Density (L/min·m²)
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Coverage Area (m²)
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Industrial building
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10
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300
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60
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0.1
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≤12
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QHYX60-0.24-100XBD-DL-3
|
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Industrial building
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10
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300
|
60
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0.1
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≤24
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QHYX60-0.4-100XBD-DL-3
|
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Industrial building
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10
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300
|
60
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0.1
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≤36
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QHYX60-0.6-100XBD-DL-3
|
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Industrial building
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10
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300
|
60
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0.1
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≤50
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QHYX60-0.8-100XBD-DL-3
|
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Industrial building
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10
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300
|
60
|
0.1
|
≤72
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QHYX60-1.0-100XBD-DL-3
|
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Industrial building
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10
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300
|
60
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0.1
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≤100
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QHYX60-1.2-100XBD-DL-3
|
|
Storage building
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15
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300
|
90
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0.1
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≤12
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QHYX90-0.24-150XBD-DL-3
|
|
Storage building
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15
|
300
|
90
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0.1
|
≤24
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QHYX90-0.4-150XBD-DL-3
|
|
Storage building
|
15
|
300
|
90
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0.1
|
≤36
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QHYX90-0.6-150XBD-DL-3
|
|
Storage building
|
15
|
300
|
90
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0.1
|
≤50
|
QHYX90-0.8-150XBD-DL-3
|
|
Storage building
|
15
|
300
|
90
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0.1
|
≤72
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QHYX90-1.0-150XBD-DL-3
|
|
Storage building
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15
|
300
|
90
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0.1
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≤100
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QHYX90-1.2-150XBD-DL-3
|
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Ordinary hazard
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6
|
300
|
40
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0.1
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≤12
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QHYX40-0.24-100XBD-DL-3
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Ordinary hazard
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6
|
300
|
40
|
0.1
|
≤24
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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
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6
|
300
|
40
|
0.1
|
≤100
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QHYX40-1.2-100XBD-DL-3
|
|
Light hazard
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3
|
300
|
15
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0.1
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≤12
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QHYX15-0.24-65XBD-DL-3
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Light hazard
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3
|
300
|
15
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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. | ||||||
Operating Manual
General Description
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The booster and pressure-stabilizing equipment is a 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 it complies with Standard Drawing 98S205 (formerly 98S176).
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This booster & stabilizing equipment is intended to solve cases in temporary high-pressure fire water supply systems where the installation height of an elevated fire water tank cannot meet the required static pressure at the most unfavorable point of the system, and therefore booster facilities must be provided. It is a fire-dedicated booster & stabilizing equipment (hereinafter referred to as “the equipment”).
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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, and it is also applicable to various fire-fighting and domestic water supply systems.
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The equipment consists of an SQL diaphragm-type air-pressure water tank (air-pressure tank), an XBD-DL multistage fire hydrant pump, a control cabinet, instruments, and piping accessories.
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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, together with relevant technical parameters.
Design technical conditions for the equipment:
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Working pressure of SQL air-pressure tank: 0.6 MPa, 1.0 MPa, 1.6 MPa.
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Fire storage water volume of SQL air-pressure tank: greater than 150 L, 300 L, 450 L.
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Stabilizing water volume of SQL air-pressure tank: greater than 50 L.
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Pressure difference of buffer water volume: 0.02–0.03 MPa; pressure difference of stabilizing water volume: 0.05–0.06 MPa.
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Working pressure ratio: a/b value within 0.6–40 ℃.
Operating Principle
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Keep the most unfavorable point of the fire water supply pipeline system always at the required fire pressure.
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Ensure that the air-pressure water tank always stores 30 seconds of fire water volume.
By setting the operating pressures P1, P2, Ps1 and Ps2 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); Ps2 is the stop pressure of the pressure-stabilizing pump (MPa).
Complete Operating Control Process
The required fire pressure P1 at the most unfavorable point of the fire hydrant system or automatic sprinkler system is calculated and taken as the inflation pressure of the air-pressure tank. Based on this, together with 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)
Under normal conditions, if leakage causes a pressure drop in the pipeline system, the pressure-stabilizing pump replenishes water and maintains pressure, repeatedly operating between Ps1 and Ps2 (start/stop). Once a fire occurs and water demand increases sharply, pressure drops from Ps1 (Ps1 → Ps2). When the pressure 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 stops automatically. The equipment control function can be restored only after the fire pump stops and a manual reset is performed.
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 the served fire water supply system: fire hydrant water supply system (X), automatic sprinkler system (Z), and combined fire hydrant & sprinkler system (XZ).
Model Designation
Examples:
① ZW(L)—I—X—10—0.16
② ZW(W)—II—X—C
Definition 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.
Calculation of P1
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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 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). -
When the equipment is installed in a high-level tank room and supplied by gravity from the tank, and the most unfavorable hydrant is lower than the equipment, P1 of the fire hydrant system is calculated as:
P1 = H3 + H4 (mH2O) -
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). -
When the equipment is installed in a high-level tank room and supplied by gravity from the tank, and the most unfavorable sprinkler head is lower than the equipment, P1 of the automatic sprinkler system is also calculated as:
P1 = ∑H + Ho + Hr + Z (mH2O) -
When the air-pressure tank and the pump unit are installed at different locations, P1 shall be recalculated separately.
Supplementary Notes
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Pressure boosting criterion: 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 nozzle, and it shall not be determined only by a static pressure of 0.07 MPa or 0.15 MPa.
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When calculating P1, the flow used for friction and local losses of the pipeline system should be the fire water demand in the early stage of a fire. For fire hydrant systems, it is typically two hydrant streams, such as 2×5 L/s = 10 L/s or 2×2.5 L/s = 5 L/s; for automatic sprinkler systems, it is typically five sprinkler heads, such as 5×1 L/s = 5 L/s.
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Main components: the air-pressure 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 fire 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 fire hydrant & sprinkler systems, not less than 450 L.
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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 tank within 3 minutes. The pump head should be selected in the high-efficiency region 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.
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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, a signal is sent to the fire control center or fire pump room. After confirmation, the hydrant pump or sprinkler pump shall be started accordingly.
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For 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.
Electrical Control Performance
-
The control system provides both automatic and manual functions and can be networked with the fire control center or fire pump room.
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Two pressure-stabilizing pumps are configured as duty/standby and operate alternately with automatic changeover.
-
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 starts automatically. They alternate operation so that system pressure is always maintained between Ps1 and Ps2.
-
Once a fire occurs and system pressure drops from Ps1 to Ps2, the system outputs a start signal and an audible/visual alarm for the main fire pump. After the main fire pump starts and returns a feedback signal, the control power of the stabilizing pumps is cut off. A manual reset is required afterwards to restore the control function.
-
The control system provides a maintenance mode. If Pump No.1 fails during operation, Pump No.2 can be 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.
-
For the size of the control cabinet, control principles and main components, refer to the company’s electrical automatic control manual.
Manufacturing & Installation Requirements
-
The air-pressure tank is manufactured according to national standard drawing set 91SS852.
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Piping uses seamless steel pipe, hot-dip galvanized steel pipe, or hot-dip galvanized seamless steel pipe.
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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.
-
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.
-
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.
-
Drainage facilities shall be provided around the equipment for draining water during maintenance or in case of accidental leakage.
-
Sufficient clearance shall be provided between the equipment and walls or other equipment, generally not less than 700 mm.
-
The equipment shall undergo overall hydrostatic strength test and tightness test in accordance with current relevant standards.
-
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.
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Installation of pumps, motors and pipelines shall comply with relevant technical specifications.
Operation Instructions
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Before commissioning, initial commissioning shall be performed by the manufacturer. After commissioning, the air inlet of the pressure tank shall not be removed at will to avoid air leakage.
-
During operation, no full-time operator is required, but regular inspection is necessary.
Pump Series & Control Reference
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. When other pumps are adopted, they shall be selected according to the flow and head requirements listed in the tables.
OEM & Custom
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. Chaodun Pump supports global distributors and contractors with reliable products and flexible engineering solutions.
FAQs
- 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, Chaodun 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.