High-pressure Sewage Double-suction Pump

The high-pressure sewage double-suction pump is a horizontal mid-casing double-suction centrifugal pump specially designed for large flow rates, medium to high head, and sewage with impurities. Based on the standard S/SH double-suction clear water pump, it has completed three core renovations: the impeller is made non-blocking (with dual channels/rotating flow), the pressure-bearing shell is upgraded, and the shaft seal is made high-pressure. Thus, it has filled the technical gap of "the clear water double-suction pump may get clogged, the submersible sewage pump has insufficient lifting height, and the flow of the slurry pump is too small".

Horizontal split pump body: The upper cover is detachable, and the rotor can be lifted out as a whole. Maintenance does not require disassembling the inlet and outlet pipes or the motor - the limited space operation in the sewage pump room is compliant, and the maintenance can be completed within 4 hours.
Double suction impeller (wastewater adjustment): Automatic balance of axial force on both sides of the water inlet, the bearing only bears the radial load, and the service life is much longer than that of single suction sewage pumps; the flow channel is widened by 15%–25%, the number of blades is reduced to 3–4, the outlet angle β₂ is reduced to 22°–26°, the H-Q curve is flat, and it is suitable for water level fluctuations.
High-pressure mechanical seal scheme:
Standard configuration: Double end face integrated mechanical seal (SiC/WC) + API 682 Plan 21 (from pump outlet to flushing → cooler → sealing chamber), flushing pressure is 0.05–0.1 MPa higher than the sealing chamber pressure
Upgrade configuration: Plan 52 (double end face + isolation liquid tank), used for sewage containing volatile organic compounds or H₂S
Material grades: Municipal sewage HT250/QT400 + impeller QT400; industrial chlorine/acid-base use 2205 duplex stainless steel; power plant gray water Cr26 high-chrome cast iron + QT400 pump body.

1. Municipal and Large-scale Water Supply
The water intake and pressurization of urban water treatment plants, with large processing capacity and requiring continuous operation;
Long-distance water transmission projects (such as water diversion and water regulation projects), with a single unit flow rate capable of reaching several thousand m³/h, showing obvious efficiency advantages.
2. Hydraulic Engineering and Flood Control and Drainage
Pump station water lifting: The main pump type for irrigation pump stations and drainage pump stations, especially suitable for high flow and medium-low head conditions;
For occasions requiring stable large flow output, such as river channel governance and reservoir water replenishment.
3. Electricity and Industrial Circulating Water
The circulating cooling water system of thermal power plants and nuclear power plants (condenser cooling), one of the most typical applications of double-suction pumps;
Circulating water transportation for steel, chemical, and petrochemical industries, with relatively clean media and requiring 24-hour continuous operation.
4. Industrial Process Water Transportation
Process water for papermaking, textile, and dyeing;
Chilled/cooling water circulation for air conditioning and central air conditioning systems.
5. Agriculture and Drainage
Main trunk canals of large irrigation areas for water lifting;
For drainage in plain areas, combined with axial flow/mixed flow pumps, double-suction pumps are responsible for the section with slightly higher head.

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