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Having 26 series -312 varieties - over 1000 pump models
Focused on water pump research and development manufacturing for 36 years
Free training for operation and maintenance personnel/free installation guidance/free provision of installation drawings
WQB Series Explosion-Proof Submersible Sewage Pump
Traffic: 10–3000 m³/h
Head: 7-70m
Power: 1.5-200kw
Efficiency: 31-81.4%
Price: 0.25–288,800
The WQB series explosion-proof submersible sewage pumps for industrial use are a new type of explosion-proof product developed by our company. Their explosion-proof performance is designed in accordance with the requirements of GB 3836.1-2010 “Explosive Atmospheres – Part 1: Equipment – General Requirements” and GB 3836.2-2010 “Explosive Atmospheres – Part 2: Equipment protected by flameproof enclosures ‘d’.” The explosion-proof marking is:
Hotline:
Submersible pump
Horizontal Single-Stage Fire Pump
Product Parameters
Meaning of Model Designations for the WQB Series Explosion-Proof Submersible Sewage Pumps
Example: WQB40-28-5.5
WQB: Explosion-proof for mining use Submersible pump (central suction type)
40: Rated flow rate (m³/h)
28: Rated head (m)
5.5: Rated power (kW)
Main Applications and Operating Conditions of the WQB Series Explosion-Proof Submersible Sewage Pump
Main uses:
The WQB explosion-proof submersible pump is designed for wastewater discharge in environments where explosive mixtures of flammable gases or vapors with air—classified as Class II B/II C and with temperature classes ranging from T1 to T4—are present. It is suitable for use in industries such as coal chemical, petrochemical, municipal engineering, urban industrial facilities, hospitals, hotels, residential communities, and other similar settings.
Terms of Use:
1. Applications that meet the explosion-proof requirements specified by the product’s explosion-proof marking.
2. Power supply voltage: 380V, 660V, and 1140V, three-phase, 50Hz.
3. Medium temperature: 0–40℃ (for temperatures exceeding this range, a hot-water pump model is available).
4. pH range of the conveyed medium: 5–9.
5. Medium density: ≤1100 kg/m³.
6. Maximum diving depth: 10 m.
Structural Features of the WQB Series Explosion-Proof Submersible Sewage Pump
1. Cable entry sealing device
It employs a two-stage rubber ring seal to completely prevent water from seeping into the motor through the cable.
2. Motor
A specially designed explosion-proof submersible motor with an IPX8 protection rating and F-class (155℃) insulation for the stator windings—under normal temperature rise conditions, the motor’s insulation life is extended.
3. Rotor Assembly
The rotor assembly undergoes dynamic balancing tests strictly according to G6.3 standards, ensuring minimal vibration during pump operation and extending the service life of bearings and seals.
4. Bearing
The deep-groove ball bearings at the upper section, combined with the angular-contact ball bearings at the lower section, provide reliable support for the shaft. The bearings used are low-noise bearings, ensuring smooth operation of the electric pump.
5. Shaft seal
The shaft seal employs two sets of mechanical seals, each operating independently to provide double redundancy. The mechanical seals operate in an oil chamber, where lubrication and cooling conditions are optimal, ensuring a long service life.
6. Pump casing
The pump casing features a single volute design, with a large cross-section and excellent anti-clogging performance.
7. Sealing ring
The sealing ring is replaceable, reducing maintenance costs. The sealing ring can be made from a high-chromium material that is hard and wear-resistant.
8. Mixing head (optional accessory)
It features a stirring and anti-sedimentation function, enabling uniform mixing of water with sediments and solid particles, thereby significantly enhancing the pump's flow capacity.
9. Impeller
The impeller features a dual-flow passage design that is perfectly matched to the pump casing. It adopts a full-head, overload-free design, ensuring that the motor will not be overloaded or damaged regardless of whether the head operates at its maximum or minimum value. The impeller’s flow passages are wide in size, providing excellent anti-clogging performance.
10. Pressure Relief Chamber
A pressure-relief chamber is designed at the rear of the impeller, effectively balancing the axial forces acting on the impeller, reducing the load on the bearings, and thereby extending the service life of the bearings.
11. Oil Chamber Leakage Sensor
A leakage sensor is installed in the shaft seal oil chamber. Once water enters the oil chamber to a certain level, the sensor sends a signal, and a dedicated external control device activates protection measures for the electric pump.
12. Cooling water jacket
Motors with a capacity of 22 kW or more are equipped with an external cooling water jacket. Water pumped through the system circulates to cool the motor, ensuring that the electric pump can continue to operate normally even when the water level is at its lowest point.
13. Motor winding temperature sensor
A PT100 temperature sensor is installed inside the motor stator winding to monitor the winding temperature and provide overheating protection for the motor via a dedicated external control device.
Key points for explosion prevention
When an explosive gas mixture inside the explosion-proof submersible sewage pump motor ignites, the explosion-proof enclosure shall remain undamaged, and the internal flame shall not propagate through the joints of the explosion-proof enclosure to ignite the external explosive atmosphere composed of one or more gases or vapors. All components making up the explosion-proof enclosure shall undergo hydrostatic testing in accordance with the provisions of GB 3836.2-2000 to ensure that they can withstand the maximum internal explosion pressure.
The explosion-proof marking for this flameproof submersible sewage electric pump is ExdIIBT4. It is suitable for locations where explosive mixtures of flammable gases or vapors with air are present, and the equipment belongs to Class II B in industrial facilities with temperature classes ranging from T1 to T4. The maximum surface temperature of the unit must comply with the specifications given in the table below:
Temperature class | T1 | T2 | T3 | T4 |
Allowable maximum surface temperature | 450 | 300 | 200 | 135 |
Performance Parameter Table for WQB Series Explosion-Proof Submersible Sewage Pumps
| Model | Traffic | Head height | Synchronous speed | Power | Efficiency | Discharge diameter |
1 | 10-15-1.5 | 10 | 15 | 3000 | 1.5 | 31 | 50 |
2 | 15-16-1.5 | 15 | 16 | 32.5 | |||
3 | 25-7-1.5 | 25 | 7 | 35.5 | |||
4 | 15-22-2.2 | 15 | 22 | 2.2 | 36 | ||
5 | 25-10-2.2 | 25 | 10 | 36 | |||
6 | 35-7-2.2 | 35 | 7 | 38 | |||
7 | 10-32-3 | 10 | 32 | 3 | 31 | ||
8 | 15-25-3 | 15 | 25 | 31.5 | |||
9 | 25-15-3 | 25 | 15 | 37 | |||
10 | 40-12-3 | 40 | 12 | 41.5 | 65 | ||
11 | 52-7-3 | 52 | 7 | 41.5 | 80 | ||
12 | 15-32-4 | 15 | 32 | 4 | 34.6 | 50 | |
13 | 20-30-4 | 20 | 30 | 41 | |||
14 | 25-22-4 | 25 | 22 | 37.8 | |||
15 | 50-15-4 | 50 | 15 | 43.3 | 80 | ||
16 | 75-8-4 | 75 | 8 | 44 | 100 | ||
17 | 12-50-5.5 | 12 | 50 | 5.5 | 33 | 50 | |
18 | 20-40-5.5 | 20 | 40 | 34 | |||
19 | 30-30-5.5 | 30 | 30 | 44 | |||
20 | 40-20-5.5 | 40 | 20 | 44.5 | |||
21 | 70-15-5.5 | 70 | 15 | 45.8 | 80 | ||
22 | 100-10-5.5 | 100 | 10 | 52.5 | 100 | ||
23 | 25-50-7.5 | 25 | 50 | 7.5 | 46.7 | 50 | |
24 | 30-36-7.5 | 30 | 36 | 44.5 | |||
25 | 50-30-7.5 | 50 | 30 | 55 | |||
26 | 75-20-7.5 | 75 | 20 | 55 | 80 | ||
27 | 100-15-7.5 | 100 | 15 | 55.3 | 100 | ||
28 | 145-10-7.5 | 145 | 10 | 3000 | 7.5 | 56.5 | 150 |
29 | 20-65-11 | 20 | 65 | 1500 | 11 | 38.6 | 50 |
30 | 40-40-11 | 40 | 40 | 46 | 80 | ||
31 | 50-35-11 | 50 | 35 | 56 | |||
32 | 80-20-11 | 80 | 20 | 56.5 | 100 | ||
33 | 150-15-11 | 150 | 15 | 55.8 | 150 | ||
34 | 200-10-11 | 200 | 10 | 57.5 | |||
35 | 40-50-15 | 40 | 50 | 15 | 44 | 80 | |
36 | 60-35-15 | 60 | 35 | 45.3 | 100 | ||
37 | 100-22-15 | 100 | 22 | 48.6 | |||
38 | 170-18-15 | 170 | 18 | 56.5 | 150 | ||
39 | 200-15-15 | 200 | 15 | 57 | |||
40 | 300-10-15 | 300 | 10 | 58 | 200 | ||
41 | 80-35-18.5 | 80 | 35 | 18.5 | 47 | 100 | |
42 | 100-30-18.5 | 100 | 30 | 48 | |||
43 | 150-25-18.5 | 150 | 25 | 57.5 | 150 | ||
44 | 250-15-18.5 | 250 | 15 | 59 | 200 | ||
45 | 40-80-22 | 40 | 80 | 22 | 44 | 80 | |
46 | 60-50-22 | 60 | 50 | 45.8 | |||
47 | 80-40-22 | 80 | 40 | 47 | |||
48 | 150-30-22 | 150 | 30 | 59.3 | 150 | ||
49 | 200-20-22 | 200 | 20 | 60 | |||
50 | 300-15-22 | 300 | 15 | 61 | 200 | ||
51 | 80-60-30 | 80 | 60 | 30 | 48.5 | 80 | |
52 | 120-50-30 | 120 | 50 | 57.8 | 150 | ||
53 | 200-30-30 | 200 | 30 | 59 | |||
54 | 300-20-30 | 300 | 20 | 61 | 200 | ||
55 | 400-15-30 | 400 | 15 | 1500 | 30 | 63 | 200 |
56 | 100-70-37 | 100 | 70 | 37 | 58.5 | 100 | |
57 | 150-45-37 | 150 | 45 | 62 | 150 | ||
58 | 350-25-37 | 350 | 25 | 69.5 | 200 | ||
59 | 500-15-37 | 500 | 15 | 72 | 250 | ||
60 | 150-50-45 | 150 | 50 | 45 | 57 | 150 | |
61 | 400-25-45 | 400 | 25 | 66 | 200 | ||
62 | 500-20-45 | 500 | 20 | 67 | 250 | ||
63 | 600-15-45 | 600 | 15 | 69 | |||
64 | 150-70-55 | 150 | 70 | 55 | 58 | 150 | |
65 | 200-50-55 | 200 | 50 | 59 | |||
66 | 400-30-55 | 400 | 30 | 66.6 | 200 | ||
67 | 500-25-55 | 500 | 25 | 68.3 | 250 | ||
68 | 600-20-55 | 600 | 20 | 68.5 | |||
69 | 200-70-75 | 200 | 70 | 75 | 58 | 150 | |
70 | 300-50-75 | 300 | 50 | 60.5 | 200 | ||
71 | 400-40-75 | 400 | 40 | 67 | |||
72 | 600-28-75 | 600 | 25 | 68 | 250 | ||
73 | 800-20-75 | 800 | 20 | 69 | 300 | ||
74 | 220-70-90 | 220 | 70 | 90 | 58.5 | 150 | |
75 | 300-60-90 | 300 | 60 | 62 | 200 | ||
76 | 500-35-90 | 500 | 35 | 64 | |||
77 | 900-20-90 | 900 | 20 | 70 | 300 | ||
78 | 400-60-110 | 400 | 60 | 110 | 69.8 | 200 | |
79 | 600-40-110 | 600 | 40 | 70 | 250 | ||
80 | 700-32-110 | 700 | 32 | 71.5 | |||
81 | 1000-25-110 | 1000 | 25 | 73 | 300 | ||
82 | 600-50-132 | 600 | 50 | 1500 | 132 | 70 | 200 |
83 | 500-60-132 | 500 | 60 | 69 | |||
84 | 800-35-132 | 800 | 35 | 69.8 | 250 | ||
85 | 1000-30-132 | 1000 | 30 | 80 | 300 | ||
86 | 700-50-160 | 700 | 50 | 160 | 71.3 | 250 | |
87 | 1000-35-160 | 1000 | 35 | 75 | 350 | ||
88 | 1500-25-160 | 1500 | 25 | 76.5 | 400 | ||
89 | 2000-20-160 | 2000 | 20 | 80 | |||
90 | 800-50-185 | 800 | 50 | 185 | 72.3 | 250 | |
91 | 1000-40-185 | 1000 | 40 | 73.8 | 300 | ||
92 | 1500-30-185 | 1500 | 30 | 74.9 | 400 | ||
93 | 2500-18-185 | 2500 | 18 | 81.4 | 500 | ||
94 | 1200-40-200 | 1200 | 40 | 200 | 76 | 350 | |
95 | 1500-32-200 | 1500 | 32 | 77.4 | 400 | ||
96 | 2000-25-200 | 2000 | 25 | 80 | |||
97 | 3000-16-200 | 3000 | 16 | 79.8 | 500 |
Friendly reminder: For more performance parameters of the explosion-proof submersible pump, please click →【 Pump Selection 】Page query
Why choose us?
Changsha Zhonghlian Pump Industry Co., Ltd. was founded in 1989 and was independently established after the restructuring of Changsha Water Pump Factory. It is a comprehensive national high-tech enterprise integrating design, research and development, manufacturing, and service. The company was listed on the Hunan Provincial Equity Exchange on December 31, 2019, with the abbreviation "Zhonghlian Pump Industry" and the equity code: 600275HN. It is currently a key backbone enterprise in China's centrifugal pump industry and one of the major professional manufacturers of multi-stage pumps in the country. The headquarters is located in Changsha City, Hunan Province, a historical and cultural city in China.
Square meters of land area
100% factory pass rate
Square meters of land area
100% factory pass rate
Q
What is your typical delivery time?
A
Models in stock can be shipped the next day at the latest. All others are custom-made, with lead times generally ranging from 7 to 90 days depending on the product size and project specifics. Please contact our sales manager for details: 0731-88632200 。
Q
Do you have centrifugal pumps in stock?
A
Centrifugal pumps come in numerous models and configurations. Except for a small number of high-volume, standard models that are in stock, the vast majority are not stocked and are customized products. We need to select a pump based on your site's flow rate, head, media temperature, pH value, and installation conditions, etc., to determine the pump model and configuration before we can submit an order to the factory for production.
Q
What information should I provide when requesting a quote?
A
Generally, to obtain an accurate quotation, we recommend providing us with the following information: pump flow rate, head, on-site operating voltage and frequency, temperature, pH value, and solid particle content of the fluid being conveyed, and on-site installation conditions (horizontal or vertical installation), etc.
If you are not sure, don't worry, our business managers will assist you in determining this.
Q
What products do you mainly produce?
A
Zhonglian Pump Industry manufactures various large industrial centrifugal pumps. Main products include: self-balancing multi-stage pumps, multi-stage centrifugal pumps, single-stage centrifugal pumps, split-case pumps, chemical pumps, submersible pumps, pipeline pumps, long-shaft pumps, condensate pumps, etc.
Q
Why is it so slow to get a price quote?
A
Because centrifugal pumps are non-standard customized products with many models, the price range is also very large. Even for the same model, the price difference is also very large due to different materials and configurations. Taking the most common water pump accessory—the impeller—as an example, the price of a stainless steel impeller is several times that of a cast iron impeller. Therefore, we need to clarify the relevant information to give you an accurate price. Normally, if you provide relatively comprehensive information, we can quote within 5 minutes.
Product message
Contact our team promptly; we are happy to help you.
*Note: Please fill in the information accurately and keep the communication open. We will contact you as soon as possible.
Hotline:
+86 0731-88632200
Export Trade/Technical Support:
+86 153-4831-2290
Head Office Email:
zoomlian@yeah.net
No. 210, Huanbao Zhong Road, Yuhua District, Changsha City, Hunan Province, Leowoju Wisdom Valley Building B, 8th Floor
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