KLP 50-900 T Dry-running pump - single flanged DAB.KLP

Product detailed description

This single flanged dry-running pump is commonly used in residential and commercial heating systems, industrial fluid transfer applications and closed-loop circulation systems. It is suitable for installations requiring reliable and efficient pumping of clean, non-corrosive liquids with properties similar to water. The pump is often integrated into central heating systems, hot water circulation loops and process cooling systems where dry running protection is essential. Installers typically encounter this model in systems with variable flow conditions and where dry running situations might occur due to low liquid levels or system start-up delays.

The KLP 50-900 T is ideal for environments where the pump might run dry temporarily without causing damage. It is frequently found in industrial facilities, large commercial buildings and in systems with automated control mechanisms. The pump’s design allows it to handle fluctuations in flow and pressure while maintaining operational stability. Due to its mechanical seal and IP55 rating, it is suitable for both indoor and semi-industrial applications where protection against dust and water ingress is required.

Technical parameters

Maximum working pressure	10 bar (1000 kPa)
Mechanical seal	carbon / ceramic
Operating range	from 2 to 67 m³/h flow rate with head up to 13.7 m
Liquid temperature range	from -15 °C to +120 °C
Degree of electrical protection	IP55
Insulation class	F
Code	60179384
Brand	IVAR

The maximum working pressure of 10 bar (1000 kPa) indicates the pump can handle high-pressure systems without failure. The mechanical seal composed of carbon and ceramic ensures durability and resistance to wear under continuous operation. The operating range of up to 67 m³/h and a head of up to 13.7 m allows for precise sizing based on the system’s hydraulic requirements. The temperature range from -15 to +120 °C enables the pump to function in both cold and hot environments, making it versatile for a wide range of applications.

Installation and connection

During installation, the pump should be mounted on a stable base to prevent vibration and misalignment. The flanged connections require proper alignment with the system piping to avoid leaks and stress on the pump housing. Ensure the flanges are tightened evenly using appropriate tools and torque specifications provided by the manufacturer. The pump is connected to the power supply via a closed two-pole or four-pole asynchronous motor, which must be correctly wired according to the electrical diagram provided in the installation manual. For single-phase motors, an internal capacitor and thermal protection are included, while three-phase models require external overload protection to be installed separately.

Common installation mistakes include incorrect flange alignment, improper tightening of bolts and failure to install the necessary overload protection for three-phase motors. Always verify the electrical connections and ensure the motor is compatible with the local power supply. Before commissioning, check the pump for correct rotation direction and ensure all seals and gaskets are intact. A pressure test of the system should also be performed to confirm there are no leaks at the flanged connections.

Compatibility and accessories

This dry-running pump is compatible with closed-loop systems using non-aggressive, non-viscous liquids. It integrates well with standard heating and plumbing systems where dry running protection is required. When installing, additional accessories such as pressure gauges, flow meters and isolation valves may be needed depending on the system configuration. Ensure the motor is protected against overloading by installing external overload protection for three-phase versions. The pump does not require any special mounting brackets or supports beyond those provided by the system’s piping layout.

Technical background for designers

The KLP 50-900 T operates on the principle of centrifugal force generated by the rotating impeller. The cast iron body provides structural strength and resistance to corrosion, while the mechanical seal prevents leakage under high-pressure conditions. The pump is designed to operate efficiently within the specified temperature range and is suitable for systems with fluctuating flow rates. The IP55 rating ensures the pump is protected against dust and water jets, making it suitable for environments with potential exposure to moisture.

The service life and efficiency of the pump depend on several factors including the quality of the liquid being pumped, the presence of abrasive particles and the frequency of dry running events. Regular inspection of the mechanical seal and bearings is recommended to maintain optimal performance. The pump’s thermal class F insulation ensures it can withstand higher temperatures without degradation, contributing to long-term reliability. Integration into the system should consider the pump’s hydraulic characteristics to avoid overloading and ensure smooth operation under varying load conditions.

Service and operation

Maintenance of the KLP 50-900 T involves periodic inspection of the mechanical seal, bearings and electrical components. Check for signs of wear, leakage or abnormal noise during operation. Ensure the motor is functioning correctly and that the thermal protection is operational. Clean the pump housing and remove any accumulated dirt or debris that could affect performance. Lubrication of moving parts should be carried out according to the manufacturer’s recommendations. In case of dry running, inspect the pump for any damage and replace worn components as necessary.

Key checkpoints during routine service include verifying the integrity of the mechanical seal, ensuring the flanged connections are tight and checking the motor’s insulation resistance. If the pump exhibits reduced performance or unusual vibrations, disassemble and inspect the internal components for wear or blockage. Replace any damaged parts immediately to prevent further damage to the system. Always follow the manufacturer’s guidelines for servicing and repair to ensure safety and compliance with technical standards.

Frequently asked questions

Can the pump handle liquids with low viscosity?
Yes, the KLP 50-900 T is suitable for non-viscous liquids with properties similar to water. It is not recommended for highly viscous fluids as they may affect pump performance.

Is the pump suitable for operation in cold environments?
Yes, the pump can operate at temperatures as low as -15 °C, making it suitable for cold environments. Ensure the system is properly insulated to prevent freezing of the liquid.

Does the pump require external overload protection for single-phase motors?
No, single-phase motors have built-in thermal protection and a capacitor. Three-phase motors require external overload protection to be installed separately.

What is the recommended maintenance interval for the mechanical seal?
There are no specific maintenance intervals provided in the brief. However, regular inspection is recommended to detect any signs of wear or leakage early.