This equipment belongs to the centrifugal pump family; specifically, it is an evolution of the standard submerged pump, offering enhanced performance. It is capable of transporting liquids such as rainwater, water containing iron scale, sewage, corrosive industrial wastewater, and seawater. It is widely used by water supply companies, sewage treatment plants, steel mills, and mines, as well as in municipal water supply and drainage, agricultural irrigation, and flood control/drainage projects. Long-shaft pumps are primarily used to transport clean water, sewage containing certain solid particles (such as iron filings, sand, or coal dust), corrosive industrial wastewater, and seawater. They are extensively utilized in raw water treatment plants, sewage treatment plants, the metallurgical and steel industries (particularly for transporting iron-scale-laden water from swirl pits), power plants, mines, municipal engineering, and agricultural water conservancy projects. Today, pump our engineering team Manufacturing Co., Ltd.—acting as specialists in the field of submerged pumps—will explain how to select the right submerged pump for your needs.
This new type of submerged pump features a coaxial connection between the motor and the pump. It consists of a pump body, a pump head, connecting piping, and a control unit. The pump body integrates a canned motor and a centrifugal pump; the motor and pump are coaxially connected and encased within an external suction shroud to form a single, inseparable unit. It is designed to meet ExsdIIBT4 explosion-proof standards (Class GA equipment) and is suitable for use in Zone 0 hazardous areas. Key design advantages include: a short shaft span (only a few hundred millimeters) that eliminates oscillation issues, resulting in smooth, quiet operation and minimal wear. Components in contact with the medium are typically made from special materials, making the pump ideal for transporting flammable or explosive media in chemical plants, pharmaceutical facilities, factory production lines, and power generation units.
1. Maintenance tasks can be determined based on operational monitoring data or scheduled preventive inspections, with problematic components repaired or replaced as necessary.
2. When the pump is disassembled for the replacement of major components, the work must meet the quality standards required for major overhauls. Major overhaul projects, procedures, and quality standards must comply with the following requirements:
1) Remove scale and rust; non-machined surfaces may be coated with non-toxic, water-resistant anti-rust paint;
2) Ensure cooling water passages, pressure gauge ports, and vent holes remain unobstructed;
3) Repair or replace the casing wall or guide vanes if corrosion or wear exceeds one-third of the original wall thickness;
4) Ensure external dimensions and fit tolerances comply with technical drawing specifications;
5) Conduct a static balance test after repairing or replacing the impeller; the permissible static imbalance deviation at the impeller's maximum diameter must comply with current standards;
6) When removing weight to correct static imbalance, grind evenly to maintain a smooth surface; the maximum grinding depth must not exceed one-third of the original shroud thickness;
7) The fit tolerance between the enclosed impeller and the shaft must comply with the H8/h7 fit requirements specified in the current national standard "Limits and Fits";
8) The taper of a semi-open impeller must match that of the tapered sleeve, with a contact area of at least 60% of the mating surface;
9) The running clearance between the enclosed impeller's wear ring and the impeller must comply with specified limits for single-stage double-suction centrifugal water pumps, as well as for long-shaft deep-well pumps and submersible well pumps; replace the wear ring if wear exceeds the specified clearance by more than 50%.
New-type submerged pump: 1) No adjustment required after installation; 2) Maintenance-free during its designed service life.
How to Select a Long-Shaft Submerged Pump