Rotary Lobe Pump FAQs

Available suction lift depends on the liquid, temperature, pump speed, and inlet pipework. Send the lift, pipe size and length, liquid viscosity, and required flow so the inlet conditions can be assessed for your application.

Liquid can pass back through rotor clearances under pressure, reducing delivered flow. Higher viscosity can reduce this internal slip, but it also affects inlet filling and drive load. Flow must be assessed with pressure, speed, and viscosity together.

A liquid that thickens when cold can require more torque at startup than during warm operation. Provide startup and operating viscosity, temperature, and discharge conditions when selecting the motor, gearbox, and starting method.

Continuous dry running should not be assumed. Any dry-exposure duty needs confirmation of the seal arrangement, cooling, speed, duration, temperature, and isolation-chamber oil condition.

The injection hole (indicator drain) must remain open and visible to reveal seal leakage. The bottom drain hole must remain sealed after oil filling. These openings have different functions; follow the maintenance instructions for the pump model.

Provide the area classification, applicable project standard, liquid, temperature, and required documentation. The motor and complete package requirements must be confirmed for the project before a configuration is offered.

Where fitted, replaceable wear plates and radial liners protect casing and cover surfaces from abrasive wear. Confirm the pump configuration and identify the parts using the model and serial number before ordering.

Use the clearance values and assembly procedure specified for the pump model. With the equipment safely isolated, check for free rotation as instructed before restarting. Request the correct service instructions if the model or clearance values are unknown.

Front-cover access may allow wet-end inspection while the pipework stays connected, depending on the build and service clearance. Isolate, lock out, depressurize, and clean the equipment under the site procedure before opening it.

Compare abrasion, chemical compatibility, temperature, solids, and cleaning requirements. An elastomer coating may suit some slurry duties, while other conditions require a different compound or metal rotor. Select against the actual liquid and operating conditions.

Provide the liquid composition, concentration, temperature, and cleaning chemicals before choosing rotor coatings, seals, and O-rings. A compound name alone does not establish compatibility with every mixture or operating condition.

Send the liquid, flow, discharge pressure, suction conditions, operating and startup viscosity, temperature, solids, and runtime. Include installation limits and details of the existing pump where available.

Yes. Send the pump model if known, required format, and intended use through the contact page. The drawing and configuration need to match the project; see Downloads for the available request categories.

Yes. Send the confirmed information and clearly mark unknown values. Additional data may be needed before the model, drive, materials, or quotation can be finalized.

List the manuals, drawings, inspection or test records, material records, and any certificates required by your project. Include the destination and applicable standard. Document availability and scope must be confirmed before ordering.