Type G single‑screw pumps feature strong medium adaptability, stable flow rate, low pressure pulsation and excellent self‑priming performance. They are widely applied in municipal sewage, industrial wastewater and sludge treatment, and suitable for conveying high‑viscosity sludge containing particles and fibers. With vortex‑free operation, the pumps can preserve sludge flocs and deliver stable conveyance. Nevertheless, sludge working conditions are characterized by abundant impurities, variable viscosity and high difficulty in filter cake conveyance. Improper model selection, operation or maintenance may easily lead to pump blockage, stator damage, efficiency reduction and other failures. Drawing on years‑long application experience in the pump industry, Teffiko has compiled complete precautions for single‑screw pumps for sludge conveyance to help users standardize operations, cut operation and maintenance costs and extend equipment service life.
Model selection shall not merely rely on theoretical parameters, and reasonable margins shall be reserved. As equipment operates for a long time, stators and rotors will gradually wear out, resulting in attenuation of pump flow rate and head. Certain margins shall be reserved for both flow rate and head during model selection to avoid failure to meet process requirements in actual output at a later stage.
For conveying high‑concentration materials such as filter cakes, positive‑pressure feeding is preferred, and feeding by means of the pump’s own suction is not recommended. Filter cakes feature poor fluidity; simple suction by the pump is prone to material break‑off and air intake, which may easily trigger dry‑running failures. Meanwhile, full consideration shall be given to impurities in the medium. Hard rigid objects such as iron nails and glass fragments are strictly prohibited from mixing into sludge. Hard objects entering the pump chamber will directly scratch the rubber stator, damage the sealing meshing line and cause direct pump performance failure. A filter is recommended for front‑end pipelines to intercept large sundries.
Comprehensive inspections shall be performed before start‑up to avoid failures from the source. Check that inlet and outlet pipelines are unobstructed, the filter is free of blockage, and flanges and sealing parts are fastened without loosening; confirm that the oil level and oil quality of lubricating oil for the reducer and bearing box are qualified. Verify motor rotation direction; reverse operation is strictly prohibited, as reverse rotation will cause component loosening and abnormal pressure to damage the pump body.
Under sludge working conditions, it is recommended to install dry‑run protection and overpressure protection devices. In case of material break‑off or outlet pressure hold‑up, the protection devices can shut down the machine in a timely manner to prevent rapid damage to stators and rotors caused by human misoperation. Ensure the pump chamber is fully filled with medium before start‑up; empty‑pump start‑up must be avoided.
Dry‑running and idling are strictly prohibited during operation. Single‑screw pumps rely on conveyed sludge medium for lubrication and cooling of rubber stators. Under dry‑running conditions, rotors and stators rub directly against each other, which will cause high‑temperature cracking and scrapping of rubber stators within a short time.
Frequent start‑stop operations and sharp pressure fluctuations shall be avoided as far as possible. Sludge has large variations in solid content and viscosity, and frequent impacts will accelerate damage to sealing parts and trigger pipeline vibration. Pay attention to changes in pressure, flow rate, noise and vibration during operation. In case of sharp pressure rise, flow rate drop, abnormal noise or jamming, shut down the machine for maintenance in a timely manner. Running equipment with faults is forbidden. If the pressure difference of the filter increases, clean intercepted sundries in a timely manner to prevent hard particles from entering the pump body.
Sludge is prone to sedimentation and hardening. After each shutdown, flush the pump chamber and pipelines with clean water to prevent residual sludge from drying and adhering to the surfaces of rotors and stators, which may cause pressure hold‑up and pump blockage upon next start‑up.
Regularly inspect the wear status of vulnerable parts such as stators, rotors and mechanical seals. Particles inside sludge will continuously wear flow‑passing components. Replace accessories in a timely manner when leakage or insufficient flow occurs. In low‑temperature environments or after long‑term shutdown, drain residual sludge and sewage inside the pump body to prevent medium from freezing, cracking the pump body and damaging sealing parts. For long‑term idle equipment, manually turn the rotor regularly to prevent static adhesion and deformation of stators and rotors.
In short, stable operation and service life of single‑screw pumps depend on scientific model selection, standardized operation and daily maintenance. Reasonably reserving margins for flow rate and pressure, adopting positive‑pressure feeding for filter cakes, equipping dry‑run and overpressure protection, strictly preventing hard objects from entering the pump, eliminating dry‑running and conducting regular cleaning and maintenance can greatly reduce failure probability and operation‑and‑maintenance costs. As a professional fluid‑equipment brand, Teffiko single‑screw pumps adapt to various complex sludge working conditions with stable performance and customizable support. They can provide users with reliable conveyance solutions and complete after‑sales services. For model‑selection adaptation, technical consultation and equipment cooperation, please contact the Teffiko team for win‑win development.
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