Product Description
型号意义
Product Introduction
1. The ZW(L) Firefighting Pressure-Stabilizing Water Supply Equipment is a newly designed booster and pressure-stabilizing system developed according to the Ministry of Construction Document [1996] No.108 (August 1996), and also complies with the requirements of Standard 98S205 (formerly 98S176).
2. This booster and stabilizing unit is specially designed to resolve the issue where the elevation of the high-level fire water tank in a temporary high-pressure firefighting system cannot meet the static pressure requirement at the most unfavorable point. Therefore, a dedicated booster and pressure-stabilizing system (hereinafter referred to as “the equipment”) is introduced.
3. The equipment is suitable for fire hydrant systems and wet-type automatic sprinkler systems in multi-storey and high-rise buildings that require pressure boosting. It can also be used for various firefighting and domestic water supply systems.
4. The system is composed of a diaphragm pressure tank, pressure-stabilizing pump, electric control cabinet, instruments, and pipeline accessories.
5. The equipment is designed in accordance with the technical parameters specified in the *Code for Fire Protection Design of High-Rise Civil Buildings* (GB50045-95) and the *Technical Specification for Pressurized Water Supply* CECS 76:95.
Technical Conditions
1. Working pressures of the SQL diaphragm pressure tank: 0.6 MPa, 1.0 MPa, 1.6 MPa.
2. Firefighting water storage capacities of the SQL diaphragm tank: greater than 150 L, 300 L, and 450 L.
3. Pressure-stabilizing water volume of the SQL diaphragm tank: greater than 50 L.
4. Buffer water volume pressure differential: 0.02–0.03 MPa; pressure-stabilizing water volume pressure differential: 0.05–0.06 MPa.
5. Working pressure ratio a/b: 0.6–40°C.
Application Conditions
1. Fire hydrant system: nozzle flow rate 2.5 L/s or 5 L/s, effective jet length 7 m, 10 m, or 13 m.
2. Automatic sprinkler system: each sprinkler has a flow rate of 1.0 L/s and an operating pressure of 0.1 MPa.
3. Ambient operating temperature for the equipment should be between 5°C and 40°C.
Working Principle
1. Ensures that the most unfavorable point in the firefighting pipeline system maintains the required fire protection pressure at all times.
2. Ensures that the WSQL diaphragm pressure tank always stores at least 30 seconds of firefighting water.
By utilizing the preset operating pressures P1, P2, Ps1, and Ps2 in the pressure tank, the pump operation is controlled to achieve booster and pressure-stabilizing functions.
* P1 — Required pressure at the most unfavorable firefighting point (MPa)
* P2 — Fire pump start pressure (MPa)
* Ps1 — Pressure-stabilizing pump start pressure (MPa)
* Ps2 — Pressure-stabilizing pump stop pressure (MPa)
Structure Diagram
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Full Operation Control Process
Based on the calculated fire pressure P1 required at the most unfavorable point of the fire hydrant system or automatic sprinkler system, P1 is used as the inflation pressure of the pressure tank. According to the selected pressure tank model and the calculated a–b value, P2 is determined, and the following control points are set:
Ps1 = P2 + (0.02–0.03)
Ps2 = Ps1 + (0.05–0.06)
Under normal conditions, if the pipeline system experiences leakage or pressure drop, the XBD-L fire pressure-stabilizing pump automatically replenishes and maintains system pressure, operating repeatedly between Ps1 and Ps2 (start/stop).
When a fire occurs, a large amount of water is discharged from the system, causing Ps1 to drop (Ps1 → Ps2). When the pressure falls to P2, an alarm signal is triggered, and the fire pump immediately starts (manual or automatic start depending on design). After the XBD-L vertical single-stage fire pump starts, the XBD-HY pressure-stabilizing pump automatically stops and remains off until the XBD-LG vertical multistage fire pump stops running, at which time manual reset restores the equipment’s control function.
Equipment Classification
According to installation position:
• Top-mounted type (I)
• Bottom-mounted type (II)
According to pressure tank orientation:
• Vertical type (L)
• Horizontal type (W)
According to the served fire water supply system:
• Hydrant system (X)
• Automatic sprinkler system (Z)
• Combined hydrant + sprinkler system (XZ)
P1 Calculation
P1 is the required fire pressure at the most unfavorable fire hydrant or sprinkler head. It is the minimum operating pressure of the equipment and must be accurately determined for proper equipment selection.
1. When the equipment is installed at ground floor and draws water from a reservoir (hydrant system):
P1 = H1 + H2 + H3 + H4 (mH₂O)
H1 — Height from reservoir low water level to the most unfavorable hydrant (mH₂O)
H2 — Sum of friction loss and local head loss in the pipeline system (mH₂O)
H3 — Pressure loss from fire hose and hydrant (mH₂O)
H4 — Nozzle pressure required for an effective jet length (mH₂O)
2. When the equipment is installed in the high-level water tank room and water flows by gravity, and the unfavorable hydrant is below the equipment:
P1 = H3 + H4 (mH₂O)
3. When the equipment is installed at ground floor and draws water from a reservoir (sprinkler system):
P1 = ∑H + Ho + Hr + Z (mH₂O)
∑H — Total friction & local losses from supply pipe to the most unfavorable sprinkler (mH₂O)
Ho — Operating pressure of the most unfavorable sprinkler (mH₂O)
Hr — Local head loss of the alarm valve (mH₂O)
Z — Height difference between sprinkler and reservoir low water level (mH₂O)
4. When installed in the high-level water tank room with gravity supply and sprinkler head is below the equipment:
P1 = ∑H + Ho + Hr + Z (mH₂O)
5. When the pressure tank and pump are installed separately, P1 must be recalculated.
Equipment Description
1. The boosting standard of this equipment:
P1 is the minimum working pressure and must meet the fire pressure required at the most unfavorable point.
For hydrant systems, P1 must ensure nozzle jet performance, not merely satisfy static pressure of 0.07 MPa or 0.15 MPa.
2. When calculating P1, the design flow should be the initial fire-fighting flow:
Hydrant system: 2 × 5 L/s = 10 L/s or 2 × 2.5 L/s = 5 L/s
Sprinkler system: typically 5 sprinklers → 5 × 1 L/s = 5 L/s
3. Main components of the equipment:
The pressure tank must contain fire reserve water, pressure-stabilizing water, and buffer volume based on the a–b value.
Minimum tank reserve volumes:
• Hydrant system ≥ 300 L
• Sprinkler system ≥ 150 L
• Combined system ≥ 450 L
4. Two pressure-stabilizing pumps (one duty, one standby) are equipped.
Flow must replenish the actual stabilizing water volume of the diaphragm tank within 3 minutes.
Head is selected from the high-efficiency section of the pump curve at (Ps1 + Ps2)/2.
The purpose is to ensure a 30-second fire reserve before the main fire pump starts.
5. Both hydrant and sprinkler systems may share one booster-stabilizing unit.
When tank pressure drops to P2 during fire, signals from hydrant or sprinkler system trigger the corresponding fire pump.
6. Top-mounted installation is preferred for hydrant systems:
Lower pump head, lower P1, lower tank pressure rating, reduced material and operating cost.
Electrical Control Features
1. The control system provides automatic and manual modes and connects with the fire control center or pump room.
2. Two stabilizing pumps operate alternately (one duty, one standby).
3. The pipeline network is maintained at high pressure. When pressure drops to Ps1, Pump No.1 starts automatically; when pressure rises to Ps2, it stops. Next time, Pump No.2 starts at Ps1. This alternation maintains system pressure between Ps1 and Ps2.
4. When a fire occurs and pressure drops from Ps1 to Ps2, the system outputs a start signal for the main fire pump and triggers audible/visual alarm. When the main pump starts, its feedback signal cuts power to the stabilizing pumps until manual reset.
5. A maintenance mode is provided:
If Pump No.1 fails, No.2 can be used; if No.2 fails, No.1 can be used, ensuring continued system operation.
6. Control cabinet dimensions, wiring diagrams, and component details are included in the equipment’s electrical control documentation.
Technical Specification Table
|
No.
|
Booster & Pressure-Stabilizing
Unit Model |
Fire Pressure P1
(MPa) |
Vertical Diaphragm Pressure Tank
|
Matched Pump
|
Operating Weight
(kg) |
Operating Pressure
(MPa) |
Stabilizing Water Volume (L)
|
||||
|
Tank Model
|
Working Pressure Ratio
|
Fire Storage Water Volume (L)
|
Pump Model
|
||||||||
|
Rated Volume
|
Effective Volume
|
||||||||||
|
1
|
ZW(L)-I-X-7
|
0.1
|
SQL800*0.6
|
0.60
|
300
|
319
|
25LG3-10*4 1.5KW
|
1452
|
P1=0.10 Ps1=0.26
P2=0.23 Ps2=0.31 |
54
|
|
|
2
|
ZW(L)-I-Z-10
|
0.16
|
SQL800*0.6
|
0.80
|
150
|
159
|
25LG3-10*4 1.5KW
|
1428
|
P1=0.16 Ps1=0.26
P2=0.23 Ps2=0.31 |
70
|
|
|
3
|
ZW(L)-I-X-10
|
0.16
|
SQL800*0.6
|
0.60
|
300
|
319
|
25LG3-10*5 1.5KW
|
1474
|
P1=0.16 Ps1=0.36
P2=0.33 Ps2=0.42 |
52
|
|
|
4
|
ZW(L)-I-X-13
|
0.22
|
SQL1000*0.6
|
0.76
|
300
|
329
|
25LG3-10*4 1.5KW
|
2312
|
P1=0.22 Ps1=0.35
P2=0.32 Ps2=0.40 |
97
|
|
|
5
|
ZW(L)-XZ-10
|
0.16
|
SQL1000*0.6
|
0.65
|
450
|
480
|
25LG3-10*4 1.5KW
|
2312
|
P1=0.16 Ps1=0.33
P2=0.30 Ps2=0.38 |
86
|
|
|
6
|
ZW(L)-XZ-13
|
0.22
|
SQL1000*0.6
|
0.67
|
450
|
452
|
25LG3-10*5 1.5KW
|
2312
|
P1=0.22 Ps1=0.41
P2=0.38 Ps2=0.46 |
80
|
|
|
7
|
ZW(L)-II-Z-
|
A
|
0.22-0.38
|
SQL800*0.6
|
0.80
|
150
|
159
|
25LG3-10*6 2.2KW
|
1452
|
P1=0.38 Ps1=0.53
P2=0.50 Ps2=0.60 |
61
|
|
8
|
ZW(L)-II-Z-
|
B
|
0.38-0.50
|
SQL800*1.0
|
0.80
|
150
|
159
|
25LG3-10*8 2.2KW
|
1513
|
P1=0.50 Ps1=0.68
P2=0.65 Ps2=0.75 |
51
|
|
9
|
ZW(L)-II-Z-
|
C
|
0.50-0.65
|
SQL1000*1.6
|
0.85
|
150
|
206
|
25LG3-10*9 2.2KW
|
1653
|
P1=0.65 Ps1=0.81
P2=0.78 Ps2=0.86 |
59
|
|
10
|
ZW(L)-II-Z-
|
D
|
0.65-0.85
|
SQL1000*1.6
|
0.85
|
150
|
206
|
25LG3-10*11 3KW
|
1701
|
P1=0.85 Ps1=1.04
P2=1.02 Ps2=1.10 |
57
|
|
11
|
ZW(L)-II-Z-
|
E
|
0.85-1.00
|
SQL1000*1.6
|
0.85
|
150
|
206
|
25LG3-10*13 4KW
|
1709
|
P1=1.00 Ps1=1.21
P2=1.19 Ps2=1.27 |
50
|
|
No.
|
Booster & Pressure-Stabilizing
Unit Model |
Fire Pressure P1
(MPa) |
Vertical Diaphragm Pressure Tank
|
Matched Pump
|
Operating Weight
(kg) |
Operating Pressure
(MPa) |
Stabilizing Water Volume (L)
|
||||
|
Tank Model
|
Working Pressure Ratio
|
Fire Storage Water Volume (L)
|
Pump Model
|
||||||||
|
Rated Volume
|
Effective Volume
|
||||||||||
|
12
|
ZW(L)-II-X-
|
A
|
0.22-0.38
|
SQL1000*0.6
|
0.78
|
300
|
302
|
25LG3-10*6 2.2KW
|
2344
|
P1=0.38 Ps1=0.55
P2=0.52 Ps2=0.60 |
72
|
|
13
|
ZW(L)-II-X-
|
B
|
0.38-0.50
|
SQL1000*1.0
|
0.78
|
300
|
302
|
25LG3-10*8 2.2KW
|
2494
|
P1=0.50 Ps1=0.70
P2=0.67 Ps2=0.75 |
61
|
|
14
|
ZW(L)-II-X-
|
C
|
0.50-0.65
|
SQL1000*1.6
|
0.78
|
300
|
302
|
25LG3-10*10 3KW
|
2689
|
P1=0.65 Ps1=0.88
P2=0.86 Ps2=0.93 |
51
|
|
15
|
ZW(L)-II-X-
|
D
|
0.65-0.85
|
SQL1000*1.6
|
0.85
|
300
|
355
|
25LG3-10*13 4KW
|
2703
|
P1=0.85 Ps1=1.05
P2=1.02 Ps2=1.10 |
82
|
|
16
|
ZW(L)-II-X-
|
E
|
0.85-1.00
|
SQL1000*1.6
|
0.88
|
300
|
355
|
25LG3-10*15 4KW
|
2730
|
P1=1.00 Ps1=1.21
P2=1.19 Ps2=1.26 |
73
|
|
17
|
ZW(L)-II-XZ-
|
A
|
0.22-0.38
|
SQL1200*0.6
|
0.80
|
450
|
474
|
25LG3-10*6 2.2KW
|
3641
|
P1=0.38 Ps1=0.53
P2=0.50 Ps2=0.58 |
133
|
|
18
|
ZW(L)-II-XZ-
|
B
|
0.38-0.50
|
SQL1200*1.0
|
0.80
|
450
|
474
|
25LG3-10*8 2.2KW
|
3947
|
P1=0.50 Ps1=0.68
P2=0.65 Ps2=0.73 |
110
|
|
19
|
ZW(L)-II-XZ-
|
C
|
0.50-0.65
|
SQL1200*1.6
|
0.80
|
450
|
474
|
25LG3-10*10 3KW
|
3961
|
P1=0.65 Ps1=0.87
P2=0.84 Ps2=0.92 |
90
|
|
20
|
ZW(L)-II-XZ-
|
D
|
0.65-0.85
|
SQL1200*1.6
|
0.80
|
450
|
474
|
25LG3-10*12 4KW
|
4124
|
P1=0.85 Ps1=1.12
P2=1.09 Ps2=1.17 |
73
|
|
21
|
ZW(L)-II-XZ-
|
E
|
0.85-1.00
|
SQL1200*1.6
|
0.80
|
450
|
474
|
25LG3-10*14 4KW
|
4156
|
P1=1.00 Ps1=1.30
P2=1.27 Ps2=1.35 |
64
|
| Note: 1. Symbols for operating pressure in the table: P1 — Charging pressure of the pressure tank (required fire pressure) (MPa) P2 — Start pressure of the fire pump (MPa) Ps1 — Start pressure of the booster / pressure-stabilizing pump (MPa) Ps2 — Stop pressure of the booster / pressure-stabilizing pump (MPa) 2. Items No. 1–6 are Type I units, generally installed in the high-level water tank room (with the most unfavorable hydrant located below the “unit”). 3. Items No. 7–21 are Type II units, usually installed in the fire pump room or water storage tank room; the listed fire pressure range and matched pumps are for selection reference. 4. Pump models listed are those of Yongjia Haiyang Pump Factory; other pumps can be selected according to the required flow rate and head. |
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OEM & Custom Solutions
We provide OEM and custom solutions including customized nameplates, control cabinet configuration, pipeline materials, voltage/frequency specifications, diaphragm tank sizes, pump brands, fire linkage configuration, and complete system customization for engineering projects and distributors.
FAQs for Oversea Buyers
1. What applications is ZW(L) equipment suitable for?
It is suitable for hydrant systems, sprinkler systems and combined firefighting water supply systems.
2. Can the system operate automatically?
Yes, it supports automatic pressure stabilization, fire linkage, pump alternation and automatic switching.
3. What is the function of the diaphragm tank?
It stores 30 seconds of initial fire water volume and maintains pressure stability.
4. How many stabilizing pumps are included?
Two pumps operate alternately (one duty, one standby) for reliability.
5. Can ZW(L) be customized for engineering projects?
Yes, including tank size, pump selection, electrical control and system layout.
6. What is the required ambient temperature?
The recommended range is 5℃–40℃.
7. Do you supply spare parts?
Yes, including pumps, seals, valves, pressure gauges and control components.