1,Causas externas más frecuentes

1）Obstrucción en la succión / falta de alimentación

° Nivel bajo en el tanque de lodos, obstrucción por impurezas, bolsas de plástico, hilos o fibras.

°Fugas de aire en la tubería de succión, válvulas no completamente abiertas, filtro obstruido.→ Síntoma: caudal muy reducido, presión baja, ruido de cavitación

2）Aumento de resistencia en la tubería de descarga

° Válvulas no completamente abiertas, incrustaciones o obstrucciones en la línea

° Obstrucción en equipos posteriores (prensa filtrante, tuberías).→ Síntoma: no sube la presión y el caudal es bajo.

3）Disminución de velocidad del motor

° Frecuencia reducida en variador, voltaje inestable, fallo del motor.

° Deslizamiento de correa (en transmisiones por correa).→ El caudal de la bomba de tornillo es proporcional a la velocidad

2.Desgaste interno de la bomba (causa principal)

1）Desgaste, hinchamiento o envejecimiento del estátor (revestimiento de goma)

°Aceite, pH ácido/alto o temperatura elevada deforman la goma y aumentan el juego.

°Mayor holgura → mayor fuga interna → baja presión y caudal.→ Esta es la avería más común en bombas de tornillo para lodos.

2）Desgaste o corrosión del rotor (tornillo metálico)

°Holgura excesiva → pérdida de capacidad de sellado.

3）Fuga o desgaste en el sello mecánico

°Pérdida de líquido → menor rendimiento y caudal reducido.

3.Problemas con el medio / condiciones de trabajo

1）Aumento repentino de concentración o viscosidad del lodo

°Mayor resistencia → la bomba no impulsa bien.

2）Entrada excesiva de aire en la bomba

°Succión en vacío, entrada de aire → la bomba “se atasca con aire” y apenas descarga.

4.Método rápido de diagnóstico

°Sonido normal, pero poco caudal y baja presión→ 90%: desgaste del estátor.

Ruidos de cavitación, caudal irregular→ Obstrucción en succión / entrada de aire / nivel bajo.

°Deterioro progresivo→ Desgaste gradual de estátor y rotor.

°Caída repentina→ Obstrucción, válvula cerrada o entrada de aire.

5.Secuencia de solución más sencilla

1）Comprobar nivel, succión, válvulas y filtro.

2）Verificar velocidad del motor / variador.

3）Comprobar obstrucciones en la tubería de descarga.

4）Revisar estátor + rotor y reemplazar si hay desgaste.

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บริษัทไคยาน จัดจำหน่ายอะไหล่ปั๊มสกรูแทนค่าแบบทั่วไปครบชุด สำหรับรุ่น NEMO/Netzsch/Seepex/Mono ได้แก่ สเตเตอร์、โรเตอร์、แผงเชื่อม、เพลาไดรฟ์,ผู้จัดจำหน่ายจากประเทศจีน

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Компания Kaiyan поставляет полный ассортимент универсальных заменяемых деталей для винтовых насосов марок NEMO/Netzsch/Seepex/Mono (тип прогрессивной полости), включая статоры, роторы, соединительные стержни, приводные валы, уплотнения. Данные детали подходят для винтовых насосов NETZSCH/SEEPEX/MONO. У нас имеется достаточный запас для немедленной отгрузки.

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Kaiyan supplies Complete generic replacement NEMO/Netzsch/Seepex/Mono progressive cavity pump spare parts，such as stators, rotors, coupling rod, driving shaft, seals, and are suitable for NETZSCH/SEEPEX/MONO screw pump parts. We have enough stock to ship at any time. learn more

Custom solutions, contact us.Email:celia@kynspump.com,WhatsApp:+86 153 1226 1613

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#Progressive Cavity Pump #screw pump #Netzsch #Seepex #Mono pump #stator #rotor #Wastewater Treatment #SludgeConveyance #Power Plant Slurry Conveyance #Food Conveyance

The post Common Faults and Corresponding Solution of Screw Pump Leakage first appeared on kynspump.com.

Leakage is a common fault during the operation of progressive cavity pumps, which is mainly related to four factors: sealing structure damage, assembly errors, component wear, and abnormal working conditions.

The specific causes can be classified as follows:

1.screw pump Seal Failure （the mechanical seal wear and damage),This is the most common cause of leakage. The shaft end seals (e.g., mechanical seals, packing seals) of progressive cavity pumps are the core components to prevent medium leakage.

1)Mechanical seals: Wear, scratches, or cracks on the friction surfaces of the rotating and stationary rings, as well as aging, deformation, or damage to the sealing elements (O-rings, bellows), will prevent the sealing surfaces from fitting tightly, leading to leakage.

2)Packing seals: Wear, loosening of the packing, or uneven compression force of the gland will cause the medium to seep out from the gap between the shaft and the packing.

2.Problems with the Pump Body or Connection Parts

1)Manufacturing defects such as sand holes and cracks in the pump body casting, or damage to the pump body due to pressure and corrosion after long-term operation, will directly cause leakage

2)Aging, deformation, misalignment of the sealing gaskets at connection parts such as the inlet and outlet flanges and pump cover, or loosening of bolts, will result in poor sealing at the joints and cause leakage.

3.Wear of screw pump Stator and Rotor or Excessive Fit Clearance

The stator (made of rubber) and rotor (made of metal) of a progressive cavity pump are the core flow-through components, which need to fit closely to form a sealed chamber.

1)Long-term transportation of particle-containing media will accelerate the wear of the stator inner wall and rotor surface, leading to increased fit clearance and medium leakage through the gap.

2)Swelling, aging, or cracking of the stator caused by excessive temperature will also damage the sealing effect and trigger leakage.

4.Assembly and Installation Errors

1)Excessive coaxiality deviation between the pump shaft and motor shaft will cause eccentric vibration during operation, leading to uneven stress on the seals, accelerated wear, and subsequent leakage.

2)Insufficient fixation of the pump body during installation will cause vibration during operation, which affects the sealing performance of the sealing surfaces and connection parts.

5.Abnormal Working Conditions

1)The actual working pressure of the pump exceeding the rated pressure will impose excessive load on the sealing system and pump body, causing seal failure or pump body damage.

2)High corrosiveness or temperature of the conveyed medium will accelerate the aging and damage of the seals, stator, and pump body, resulting in leakage.

Kaiyan supplies Complete generic replacement NEMO/Netzsch/Seepex/Mono progressive cavity pump spare parts，such as stators, rotors, coupling rod, driving shaft, seals, and are suitable for NETZSCH/SEEPEX/MONO screw pump parts. We have enough stock to ship at any time. china learn more

#Chinese manufacturer #Chinese factory #supply China #netzsch pump #seepex pump #Mono pump #stator & rotor #mechanical seal #FluidTransfer #ChemicalEquipment #OilMachinery #FoodProcessingEquipment #SludgeTreatment #HighViscosityTransfer #NonPulsatingFlow #ClogFreePump #HighPressurePump #Sludge/Grease/Melt Transfer #wastewater treatment #sewage treatment

Customized solutions. Contact us.Email:celia@kynspump.com,WhatsApp:+86 153 1226 1613

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– Prioritize checking the shaft end seal ( screw pump mechanical seal/packing seal area)

– Check the connection parts such as inlet and outlet flanges, pump cover

– Observe whether there are damages such as sand holes and cracks on the pump body surface

2.Check the status of sealing components

– For mechanical seal: Check if the friction surfaces of rotating ring and stationary ring are worn, scratched or cracked; Inspect if O-rings and bellows are aged or deformed

– For packing seal: Check if the packing is worn or loose; Verify if the gland compression force is even

3. Check the sealing condition of connection parts

– Check if the gaskets of flanges and pump cover are aged or misplaced

– Check if the connecting bolts are loose and tighten them evenly if necessary

4.Check the fit status of screw pump rotor and stator

– Stop the pump and disassemble the pump body to check if the stator inner wall is swollen, aged or cracked

– Check if there are wear marks on the rotor surface; Measure whether the fit clearance between them exceeds the standard

 5.Verify the assembly and installation accuracy

– Detect if the coaxiality deviation between pump shaft and motor shaft is excessive

– Check if the pump body is firmly fixed and if there is abnormal vibration during operation

6.Verify the operating condition parameters

 -Confirm whether the actual working pressure exceeds the rated pressure of the pump

– Confirm whether the temperature and corrosiveness of the conveyed medium match the design requirements of the pump

7.Fault handling and retest

– Replace damaged components such as progressive cavity pump stators,rotors,coupling rods, driving shafts, drive shaft,plug-in Shaft, Universal Joint assembly,connecting cod,mechanical seals, gaskets,

– Readjust the assembly accuracy and tighten the connection parts

– Start the pump for trial operation and confirm whether the liquid leakage fault is eliminated

Kaiyan supplies Complete generic replacement NEMO/Netzsch/Seepex/Mono progressive cavity pump spare parts，such as stators, rotors, coupling rod, driving shaft, seals, and are suitable for NETZSCH/SEEPEX/MONO screw pump parts. We have enough stock to ship at any time

Customized Solutions – Contact Us Email:celia@kynspump.com,WhatsApp:+86 153 1226 1613

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The post How to troubleshoot the leakage of a progressive cavity pump? first appeared on kynspump.com.

Detailed Explanations Core Causes for Stator Debonding of Progressive Cavity Pumps

The core causes for stator debonding of progressive cavity pumps are divided into three categories, with detailed explanations as follows

1.Screw pump stator Material and Process Defects

This category refers to the inherent quality problems of the stator itself during manufacturing, which directly lead to insufficient bonding strength between the rubber bushing and the metal shell.

1)Inadequate surface treatment of metal shell

The inner wall of the metal shell is not thoroughly cleaned to remove oil stains, rust, and other contaminants. Without processes like sandblasting to increase surface roughness, the adhesive cannot form a firm mechanical interlocking structure with the metal surface, resulting in weak initial bonding force.

2)Improper adhesive selection or curing process

Selecting an adhesive that is not compatible with the stator rubber and metal material will fail to form stable chemical bonds. In addition, insufficient or excessive curing temperature, as well as insufficient curing time, will cause the adhesive to fail to reach its designed bonding strength, leaving hidden dangers of debonding.

3)Poor compatibility between rubber, metal and adhesive

2.Abnormal Operating Conditions

This category refers to the damage to the bonding layer caused by the pump operating beyond the designed working parameters for a long time.

1)Medium corrosion or rubber swelling

When conveying corrosive media such as strong acids, strong alkalis, or organic solvents, the medium will penetrate the bonding interface, corrode the adhesive layer, and destroy its chemical structure. Meanwhile, some media will cause the rubber bushing to swell or shrink, generating deformation stress at the bonding interface and tearing the bonding layer.

2)Internal stress caused by severe temperature fluctuation

Rubber, adhesive, and metal have different coefficients of thermal expansion and contraction. Frequent and drastic changes in the temperature of the conveying medium or the operating environment will cause the three materials to expand and contract inconsistently, generating continuous internal stress at the bonding interface. This stress will gradually fatigue the bonding layer and lead to debonding.

3)Pressure overload or frequent impact

Long-term operation of the pump at a pressure exceeding the rated value will cause the stator rubber to be subjected to excessive extrusion force, and the bonding interface will bear continuous tensile stress. In addition, frequent start-stop operations of the pump will cause periodic pressure shocks to the stator, which will repeatedly impact the bonding layer and accelerate its failure.

4)High-temperature ablation due to dry running

Dry running of the pump without medium lubrication will cause intense friction between the rotor and the stator rubber. A large amount of heat generated by friction will rapidly increase the temperature of the bonding interface, causing the adhesive to decompose and carbonize, and directly leading to the debonding and even falling off of the rubber bushing.

3.Improper Installation and Operation

This category refers to the damage to the stator bonding structure caused by human factors during installation and daily operation.

1)Coaxiality deviation between rotor and stator

If the rotor and stator are not aligned concentrically during installation, the pump will produce eccentric operation during operation. This will cause uneven radial force on the stator rubber bushing, and the local bonding interface will bear excessive shear force for a long time, which will gradually damage the bonding layer and cause debonding.

2)Solid impurities in medium abrade the bonding surface

Solid particles such as sand and gravel mixed in the conveying medium will enter the gap between the rotor and stator, and continuously grind the edge of the bonding interface between the rubber bushing and the metal shell during the operation of the pump. This will wear away the adhesive at the edge, and the damage will gradually extend to the entire bonding surface, resulting in debonding.

Kaiyan supplies Complete generic replacement NEMO/Netzsch/Seepex/Mono progressive cavity pump spare parts，such as stators, rotors, coupling rod, driving shaft, seals,

Custom solution,please contact us,Email:celia@kynspump.com,WhatsApp:+86 153 1226 1613

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Product Name: High-performance Zinc-free Screw Pump StatorS

1. Industry-specific Design

Stators for Screw Pumps, Designed for New Energy Lithium Battery Applications, perfectly matched with CNT-NMP conductive slurry, electrolyte and binder conveying scenarios in lithium battery production lines. It ensures stable material delivery without causing slurry agglomeration.

2. Premium Zinc-free Material Selection

Available in modified PPS, PTFE and FKM fluororubber, all adopting zinc-free formula that complies with RoHS certification. The materials feature excellent chemical corrosion resistance, high wear resistance and low shear performance, extending the service life of the stator by 30% compared with ordinary rubber stators.

3. Precision Manufacturing & Compatibility

Precision injection molding process ensures tight fit with 304,316L nitrided steel rotors or 2205 duplex steel rotors

4. Cost-effective & Low Maintenance

The stator has strong anti-aging performance, reducing the frequency of replacement and downtime maintenance. It provides a high-cost performance solution for new energy lithium battery manufacturers.Applicable Pump Models: Horizontal single screw pump, micro screw pump, high-power screw pump

Custom solution,please contact us: Email:celia@kynspump.com,WhatsApp:+86 153 1226 1613, learn more

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1. Clarify Medium & Working Condition Parameters

First confirm 3 core indicators: medium type (slurry/crude oil/chemical slurry, etc.), sand content (＜10%/≥10%), pH value (neutral/weak acid-alkali/strong acid-alkali), temperature (≤80℃/＞80℃).

2. Stator Material Selection (Rubber-Based)

-Neutral, non-corrosive or Weak acid-alkali,sand content ＜10% → Nitrile Butadiene Rubber (NBR);Features: Wear-resistant, oil-resistant, high cost-effectiveness, suitable for suitable for conventional slurry ,oil-associated slurry, general Sewage sludge/wastewater transfer ,mining and river dredging,

— Weak acid-alkali, high water content → Ethylene Propylene Diene Monomer (EPDM); suitable for municipal sludge, weak acid-alkali wastewaters/ewage treatment,(But not tolerant of oil)

– Low-to-medium concentration acid-alkali + high sand content → Hydrogenated Nitrile Butadiene Rubber (HNBR); suitable for mining mild corrosive pulp

– Strong acid-alkali, high temperature (≤180℃) → Fluororubber (FKM); suitable for concentrated acid slurry, chemical corrosive paste

– High sand content (≥10%) wear-resistant conditions → Wear-resistant rubber; suitable for river dredging, mining high-sand pulp,

3. Rotor Material Selection (Metal-Based)

– Neutral, non-corrosive, conventional conditions → Quenched 45# Steel / 304 Stainless Steel; low cost, easy to process

– Weak acid-alkali, sand content ＜10% → 316L Stainless Steel; resistant to mild corrosion, suitable for chemical wastewater

– Medium-strong acid, high sand content erosion conditions → 2205/2507 Duplex Stainless Steel; resistant to pitting and erosion

– Ultra-high sand content, severe wear conditions → Tungsten Carbide Coated Rotor; high surface hardness, 3-5 times longer service life than ordinary metal

#Netzsch pump #Seepex pump #screw pump #Progressive Cavity Pump #stator #rotor #Sewage sludge #Wastewater treatment

For customized solutions, please contact us.

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