Solutions for public and private swimming pools

When selecting the appropriate drive type for a Pump tube, the question often arises in practice as to whether an impeller or a rotor should be used. The decision depends largely on the hydraulic requirements of the specific application.

Application 1: High delivery pressure and greater delivery heads required

Requirement
If long hose or pipe runs need to be overcome, the fluid has increased Viscosity or density, or higher overall pressure losses occur, a greater delivery head is required.

Typical influencing factors are:

• Long hose lengths
• Viscous or heavy fluids
• Required pressure build-up in the system

Recommended solution
Impeller (L) = Radial impeller

The impeller is designed for applications where a stable pressure build-up is required. The pump tube thus enables reliable delivery even with increased resistance in the system and ensures a constant delivery capacity under demanding operating conditions.

Application 2: High flow rate with free discharge

Requirement
Where there is a free discharge and no significant Pressure losses in the delivery system, the priority is often to achieve the highest possible flow rate.

Typical influencing factors are:

• Short hose lengths
• Low flow resistance
• Focus on flow rate rather than delivery head

Recommended solution
Rotor (R) = Axial impeller

The rotor is designed for maximum flow rates at minimum back pressure. It is ideal for applications with a free outlet where large flow rates need to be delivered efficiently and economically.

Conclusion:
The choice between an impeller and a rotor depends primarily on the hydraulic requirements of the application. For higher pressure requirements and greater delivery heads, the impeller is the appropriate solution. For free discharge and where high flow rates are required, the rotor is recommended.

When selecting a Pump tube, the correct seal type depends primarily on the properties of the pumped medium. The decisive factor is whether the medium is prone to deposits, crystallisation, sticking or hardening.

Pump tube with mechanical seal (GLRD)

Pump tubes with mechanical seals are the preferred choice when pumping media that are prone to crystallisation, sticking, hardening or spoilage. The mechanical seal prevents the pumped medium from entering the shaft guide tube. This reduces the risk of deposits and prevents the Drive shaft from seizing.

A further advantage is the simplified cleaning and flushing of the pump tube, particularly with demanding or changing media.

During operation, a thin lubricating film formed from the pumped medium develops between the sliding surfaces of the Mechanical seal. For this reason, dry running must be avoided at all costs, as this can lead to rapid wear or damage to the seal.

Recommended for:

• crystallising media
• sticky or hardening liquids
• perishable pumped media
• applications with increased cleaning and flushing requirements

Seal-less pump tube (DL)

Seal-less Pump tubes are suitable for all applications where the pumped medium does not cause critical deposits or scaling. As there is no mechanical seal, these pump tubes have a simpler design and are less sensitive to brief periods of dry running.

Brief dry running does not usually cause immediate damage to the pump tube. Nevertheless, dry running should always be avoided to prevent unnecessary wear and to maximise the Pump’s service life. Operation should therefore always be supervised.

Recommended for:

• non-critical, clean or low-viscosity media
• Applications with no tendency to form deposits
• Applications with the possibility of short-term dry running

Conclusion:

If the pumped medium is prone to crystallisation, sticking, hardening or spoilage, a pump tube with a mechanical seal should generally be used. In all other standard pumping applications, a seal-less pump tube is usually the appropriate choice.

Yes. If you generally want your motors to be equipped with Ex plugs for your applications, this can be permanently stored using an item or reference number, for example an internal item number. This ensures that future orders are automatically delivered with the desired plug design.

Yes. Explosion-proof plugs are available from the Lutz range of accessories. You can choose between CEAG and STAHL brands. Installation and the necessary testing are carried out by Lutz prior to delivery, ensuring that the motor is delivered ready for operation and in compliance with standards.

No. Explosion-proof motors from the ME series are supplied with a 5-metre connection cable and a protective earth plug as standard. This version was deliberately chosen because the 5-metre connection cable is sufficient in most applications to leave the explosion-hazardous area defined by the operator. Outside the Ex area, the motor can then be operated in accordance with standards via a protective contact plug, depending on the respective zone classification of the system.

Yes. If you generally want your motors to be equipped with Ex plugs for your applications, this can be permanently stored using an item or reference number, for example an internal item number. This ensures that future orders are automatically delivered with the desired plug design.

Yes. Explosion-proof plugs are available from the Lutz range of accessories. You can choose between CEAG and STAHL brands. Installation and the necessary testing are carried out by Lutz prior to delivery, ensuring that the motor is delivered ready for operation and in compliance with standards.

No. Explosion-proof motors from the ME series are supplied with a 5-metre connection cable and a protective earth plug as standard. This version was deliberately chosen because the 5-metre connection cable is sufficient in most applications to leave the explosion-hazardous area defined by the operator. Outside the Ex area, the motor can then be operated in accordance with standards via a protective contact plug, depending on the respective zone classification of the system.

Lutz does not currently offer any battery-powered drum pumps with ATEX approval for potentially explosive areas. Only fully explosion-proof drive systems may be used for flammable media such as ethanol.

The reason for this lies in the safety requirements. Batteries are potential ignition sources as they can generate heat or sparks in the event of a fault. In hazardous areas, however, the entire system consisting of the motor, energy source and electrical wiring must be ATEX-compliant. Individual protected components are not sufficient.

 As soon as the application is located in a hazardous area, the use of an explosion-proof drum pump is mandatory. This applies regardless of the quantity being pumped or whether the application is stationary or takes place at different locations.

For such applications, we recommend using a drum pump with:

• ATEX-certified electric motor or compressed air motor
• Suitable earthing to prevent electrostatic charging
• Media-resistant materials for ethanol

If a mobile solution is to be implemented, it can be checked whether the power supply can be positioned outside the Ex zone or whether a compressed air-powered version is more suitable.

The specific design should always be based on the zone classification, the operational safety requirements and the desired delivery rate.

Pumpen und Durchflusszähler mit Lebensmittelkontakt zählen zu den sog. „Lebensmittelbedarfsgegenständen“ und unterliegen strengen gesetzlichen Regelungen. Die Lutz PURE Serie beinhaltet Produkte, die gleichzeitig den ATEX-Richtlinien, der FDA-Verordnung und den europäischen Verordnungen nach 1935/2004/EG entsprechen.

When selecting the appropriate drive type for a Pump tube, the question often arises in practice as to whether an impeller or a rotor should be used. The decision depends largely on the hydraulic requirements of the specific application.

Application 1: High delivery pressure and greater delivery heads required

Requirement
If long hose or pipe runs need to be overcome, the fluid has increased Viscosity or density, or higher overall pressure losses occur, a greater delivery head is required.

Typical influencing factors are:

• Long hose lengths
• Viscous or heavy fluids
• Required pressure build-up in the system

Recommended solution
Impeller (L) = Radial impeller

The impeller is designed for applications where a stable pressure build-up is required. The pump tube thus enables reliable delivery even with increased resistance in the system and ensures a constant delivery capacity under demanding operating conditions.

Application 2: High flow rate with free discharge

Requirement
Where there is a free discharge and no significant Pressure losses in the delivery system, the priority is often to achieve the highest possible flow rate.

Typical influencing factors are:

• Short hose lengths
• Low flow resistance
• Focus on flow rate rather than delivery head

Recommended solution
Rotor (R) = Axial impeller

The rotor is designed for maximum flow rates at minimum back pressure. It is ideal for applications with a free outlet where large flow rates need to be delivered efficiently and economically.

Conclusion:
The choice between an impeller and a rotor depends primarily on the hydraulic requirements of the application. For higher pressure requirements and greater delivery heads, the impeller is the appropriate solution. For free discharge and where high flow rates are required, the rotor is recommended.

When selecting a Pump tube, the correct seal type depends primarily on the properties of the pumped medium. The decisive factor is whether the medium is prone to deposits, crystallisation, sticking or hardening.

Pump tube with mechanical seal (GLRD)

Pump tubes with mechanical seals are the preferred choice when pumping media that are prone to crystallisation, sticking, hardening or spoilage. The mechanical seal prevents the pumped medium from entering the shaft guide tube. This reduces the risk of deposits and prevents the Drive shaft from seizing.

A further advantage is the simplified cleaning and flushing of the pump tube, particularly with demanding or changing media.

During operation, a thin lubricating film formed from the pumped medium develops between the sliding surfaces of the Mechanical seal. For this reason, dry running must be avoided at all costs, as this can lead to rapid wear or damage to the seal.

Recommended for:

• crystallising media
• sticky or hardening liquids
• perishable pumped media
• applications with increased cleaning and flushing requirements

Seal-less pump tube (DL)

Seal-less Pump tubes are suitable for all applications where the pumped medium does not cause critical deposits or scaling. As there is no mechanical seal, these pump tubes have a simpler design and are less sensitive to brief periods of dry running.

Brief dry running does not usually cause immediate damage to the pump tube. Nevertheless, dry running should always be avoided to prevent unnecessary wear and to maximise the Pump’s service life. Operation should therefore always be supervised.

Recommended for:

• non-critical, clean or low-viscosity media
• Applications with no tendency to form deposits
• Applications with the possibility of short-term dry running

Conclusion:

If the pumped medium is prone to crystallisation, sticking, hardening or spoilage, a pump tube with a mechanical seal should generally be used. In all other standard pumping applications, a seal-less pump tube is usually the appropriate choice.

The LubeDrive operates on the positive displacement principle, which means that the delivery capacity increases in direct proportion to the drive speed. Whilst we recommend using the first gear setting on the cordless screwdriver for highly viscous media such as grease, the second gear setting can be used for less viscous media such as gear oil. Due to the lower Viscosity of the medium, a lower torque is required, allowing the Pump to be operated at a higher speed.

Practical tests have shown that when pumping gear oil with the LubeDrive, a flow rate of approx. 5 to 6 litres per minute can be achieved. The actual delivery capacity achievable also depends on the speed and available torque of the cordless screwdriver used.