Features of Grundfos KPL, KPG, and KWM Submersible Axial-Flow Pumps

As a professional range of submersible pumps, the Grundfos KPL (submersible axial-flow pump), KPG (submersible gate pump), and KWM (submersible mixed-flow pump) are designed to combine high-efficiency operation, durability, safety, and broad applicability. Below are the details of their core features:

I. Basic Performance and Applications

Power and Motor Configuration

Equipped with motors ranging from 11 to 700 kW, with pole configurations including 4, 6, 8, 10, 12, 14, 16, 18, and 20 poles, allowing for flexible matching based on specific flow and head requirements.
Motors feature Class F insulation (155°C) and IP68 protection, ensuring stable long-term underwater operation and suitability for harsh, humid environments.

Applications

Municipal and industrial sectors, including stormwater drainage, wastewater transport, flood control, irrigation, and raw water intake.
Specialized applications such as water circulation in water parks and aquaculture; capable of meeting requirements for high flow rates and low head (KPL/KPG) or medium-to-high head (KWM).

II. Structural and Material Advantages

Durable Materials

The main body is constructed from wear-resistant materials such as cast iron and stainless steel. Key components—such as impellers and wear rings—are available in AISI 304, 316, or duplex stainless steel, enhancing corrosion and wear resistance when handling complex fluids like stormwater and sewage.
Components such as lifting brackets are made of AISI 316 stainless steel, improving overall structural stability and corrosion resistance.

Compact Design

Compact structure facilitates easy installation and operation while saving space. KPL and KWM models are designed for vertical submersible installation, while KPG models support both vertical and horizontal submersible installation, adapting to various site conditions.

III. High-Efficiency Hydraulic Design

Impeller Optimization

KPL and KPG: Impellers are specifically designed based on the pump's operating point to ensure high-efficiency performance at the required flow rate and head. KPG EB (Bi-directional): The impeller is specifically designed for bi-directional operation, enabling pumping in both forward and reverse directions; suitable for applications requiring bi-directional drainage.
KWM: Mixed-flow impeller optimized for specific operating points, balancing flow rate and head performance; suitable for medium-to-high head requirements.

Anti-turbulence and Self-cleaning

Equipped with Turbulence Optimizer™ to reduce turbulence in the gap between the pump volute and the pump pit, minimizing the impact of pit misalignment on efficiency.
Self-cleaning hydraulic system reduces the risk of clogging by debris and lowers maintenance frequency.

IV. Safety and Protection Features

Sealing and Protection

Dual mechanical shaft seal system (silicon carbide material): Isolates the pumped liquid from the motor, preventing liquid ingress.
Watertight cable entry: Features dual sealing (double rubber rings + two-component epoxy resin potting) to prevent moisture penetration.

Condition Monitoring and Protection

Moisture monitoring: Two moisture switches monitor the stator chamber and terminal box respectively, automatically cutting off power in the event of a leak.
Temperature protection: Stator windings feature three built-in bimetallic thermal sensors and a Pt100 sensor for real-time temperature monitoring and overheating prevention.
Optional Water-in-Oil (WIO) sensor: Monitors shaft seal status and provides early warning of oil contamination; vibration sensor (PVS 3) monitors equipment vibration to detect anomalies promptly.

V. Operational and Control Flexibility

Operational Adaptability

Supports continuous or intermittent operation; allows up to 15 starts per hour for motors ≤90 kW, with start limits varying by power rating for motors >90 kW (max. 10 starts/hour) to prevent component overload.
Compatible with variable frequency drives (e.g., Grundfos CUE) or soft starters, supporting variable speed operation to stabilize flow and reduce starting shock.

Intelligent Control

Connects to dedicated Grundfos controllers (DC), IO 113 protection modules, SM 113 sensor modules, etc., enabling functions such as flow calculation, energy optimization, and fault early warning.
Supports communication with SCADA and BMS systems, facilitating remote monitoring and integrated management.

VI. Customization and Expandability

Customization Options

Cable length and EMC-shielded cables can be customized upon request; motor options include special insulation (e.g., Class H), specific temperature rise ratings (e.g., Class B), or medium-to-high voltage versions.
Special anti-corrosion coatings (such as Jotun paint) are available to withstand highly corrosive environments, including seawater.

Accessory Support

Accessories such as anti-cavitation cones, mounting rings, cable suspension systems (essential for column installations), and prefabricated intake devices are available to optimize installation and operational performance.

Summary

By combining material upgrades, hydraulic optimization, safety monitoring, and flexible control, the Grundfos KPL, KPG, and KWM pump series meet high-flow pumping demands in municipal and industrial sectors. Offering durability, high efficiency, and expandability, they are suitable for handling various media—including stormwater, wastewater, and raw water—serving as reliable solutions for large-scale fluid transport.