440V Explosion-proof Submersible Pump

The 440V explosion-proof submersible pump is an explosion-proof derivative of the WQ series submersible sewage pumps, specifically designed for sewage lifting in flammable and explosive hazardous areas. It is sold for scenarios such as petrochemical plants, offshore platforms, mines, oil depots, and refining and chemical plant areas where the medium or environment contains combustible gases. The structure remains a coaxial direct connection of the motor and pump for submersible type, with single/double flow channels or cutting type (with non-clogging properties retained), with diameters ranging from 50 to 300 mm, flow rates ranging from 5 to 1500 m³/h, head ranging from 5 to 60 m, medium temperature ≤ 40 ℃ (high-temperature model 100 ℃), pH 4-10, protection class IP68, insulation F grade (the stator winding of the explosion-proof motor needs to undergo vacuum pressure impregnation VPI before embedding, and the explosion-proof motor housing is made of thickened castings + flat sealing surfaces). The flow components are HT250/QT500-7, and corrosion conditions can be selected as 304/316; the motor housing is 304 stainless steel, the shaft seal is double-end mechanical seal + oil chamber, the oil chamber leakage probe + motor cavity overheating/rotor temperature measurement + explosion-proof junction box for triple protection.

National standard copper motor, with sufficient power, equipped with cold-rolled silicon steel sheets, durable and with long service life
Durable and corrosion-resistant, with long service life
High-precision bearings, low noise, small friction resistance
Low noise, rust-proof and corrosion-proof
High-precision rotor, stable operation, high efficiency
Fluorine rubber mechanical seal, corrosion-resistant, wear-resistant and high-temperature resistant
Customized alloy, PTFE mechanical seal

BT4/CT4 explosion-proof motor
The explosion-proof certificate can be shipped along with the product in cast iron or stainless steel versions, suitable for coal mines and other flammable and explosive environments.

No blockage of the impeller, fibers can pass through even in dangerous areas: The media in explosion-proof scenarios are often more complex - oil wastewater in petrochemical plants contains rags/plastic pieces, mine water contains wood chips/coal dust, and offshore platforms contain seaweed/cable sheaths. The 440V explosion-proof submersible pump still uses single/double flow channels or cutting impellers, which can handle the largest solid particles of 25-100 mm (based on diameter), and long fibers can be crushed. It does not sacrifice passability due to "explosion-proof".
Double-end face mechanical seals + oil chamber + triple protection: Explosion-proof pumps with 440V voltage have zero tolerance for "leakage" (the sewage entering the motor chamber may short-circuit and spark), so they are equipped with double-end face mechanical seals (carbide/hard alloy) in series + oil chamber buffering. An oil leak detector is installed in the oil chamber, and there is a PT100 temperature sensor in the motor housing, and a temperature sensor extension can be installed in the junction box. The control cabinet needs to be equipped with explosion-proof type or placed in a safe area.
Self-coupling installation is optional, no need to go down the well for maintenance: For pipes with a diameter of ≥ 65, a self-coupling guide rail system can be selected. The pump slides down along the guide rail and automatically couples with the flange. During maintenance and lifting, the person does not need to go down the well - "people going down the well" in the explosion-proof area is itself a high-risk operation, and self-coupling is a must-have.
The material can be upgraded to cope with corrosive media: For oil wastewater in petrochemical plants, it often contains hydrogen sulfide, phenol, and alkali. A 316 impeller + pump body can be selected; for seawater on offshore platforms, 2205 duplex steel can be selected; the motor housing is Standard configuration 304, and 316 can be used in corrosive environments.

Petrochemical industrial park: Upgrading of oily wastewater from the refining and chemical production area, wastewater from the ethylene plant, and rainwater from the storage tank area (which may contain oil and volatile substances), with the medium carrying oil, suspended solids, and environmental presence of oil vapors. It must be Ex d IIB T4 + 440V (most refineries in the Middle East/Southeast Asia use 440V busbars).
Offshore platform / shore-based oil depot: Upgrading of oily wastewater and cargo tank washing water on the platform deck. Dual hazards of salt fog and oil corrosion, 316 material for motor casing and Ex certification is standard; Rainwater / emergency pool drainage from the shore-based oil depot, 440V is the standard in the Americas/Middle East oil regions.
Drainage from underground and surface of coal mines / non-coal mines: Mine water containing coal dust / rock dust, with gas hazards in the sub-area below the mine, requires Ex d I (mine explosion-proof, Mb level) certification; Rainwater / oily wastewater lifting at the mine entrance can use Ex d IIB. 440V is a common voltage in overseas mines.

1. Before using the pump, carefully check whether the cable is damaged, whether the fasteners are loose or fallen off, and whether the pump has deformed or been damaged during transportation, storage, and installation.
2. Use a 500V megohmmeter to measure the resistance between the same and the neutral of the electric pump motor. The value should be no less than 2 megohms. Otherwise, dry treatment of the motor stator winding should be carried out. The drying treatment temperature should not exceed 120℃.
3. This series of pumps have two installation types: fixed and mobile. When using the fixed automatic installation method, the chain ropes should be inserted separately (offset from the pump outlet, and the connection lines should be parallel to the pump outlet). Slide uniformly and slowly along the guide rail until the automatic coupling is placed properly. When using the mobile installation method, first put on the hose, and use the chain ropes to insert into the two rings to lift the electric pump up and down. Note that the cable should not be used as a rope to avoid danger.
4. From the perspective of the water inlet, the rotation direction of the pump after being connected is counterclockwise. If the electric pump rotates in reverse, switch the two wires in the cable to the opposite wiring position.
5. The grounding wire of the pump casing must be strictly connected in accordance with relevant regulations. During the operation of the electric pump, it is strictly prohibited to install nearby, work underwater, or move it to avoid electric leakage and accidents.
6. The electric pump should be equipped with a fully automatic water pump control cabinet. Do not directly connect to the power grid or use a knife switch to connect the power supply. The electric pump should operate normally.
7. Do not allow the electric pump to operate at a low head for a long time (generally, the head used should not be lower than 60% of the rated head). It should be controlled within the recommended operating head range to avoid the motor of the electric pump being burned out due to overload.
8. Do not allow the entire pump to be exposed above the water surface for a long time to avoid overheating and damage of the electric pump.

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