The SLZ end suction, long coupled, single-stage centrifugal chemical process pump is a masterpiece of engineering, standardized to meet EN 22858 / ISO 2858. It offers versatile application potential across diverse industrial and marine sectors. Expertly crafted to handle low-viscosity, clean, or slightly contaminated fluids devoid of solid or fibrous materials, this pump excels in transferring fresh water, sea water, and fuels like diesel, petrol, and kerosene. Its adaptability shines in sectors such as fuel transfer, chemical processing, energy production, mining, fire fighting, irrigation, water supply, treatment, pressurization, grey water handling, dewatering, and marine operations.
This robust centrifugal chemical process pump is designed for heavy-duty performance, boasting high flow and pressure capabilities to meet demanding industrial requirements.
The long coupled centrifugal chemical process pump design offers a multitude of advantages, ensuring efficiency and reliability in every operation.
The long coupled configuration simplifies maintenance, allowing easy access to the pump head without necessitating motor removal. This design enhances operational efficiency and reduces downtime.
Engineered for durability and continuous operation, this process pump features additional bearings in the pump head, alleviating motor stress and ensuring prolonged service life.
The innovative back pull out design facilitates the removal of the motor while keeping the pump connected to the pipework, significantly saving time during service and maintenance tasks.
Featuring independent shafts for both the pump and motor, this design ensures that only the pump shaft requires replacement if damaged, contrasting with less robust models where a broken shaft necessitates full motor replacement.
The long coupled design provides ample space between the pump and motor, offering enhanced protection from fluid ingress should a seal failure occur, thereby safeguarding the motor.
Product Summary
• Capable of pumping a diverse range of clean, low-viscosity, or slightly contaminated fluids, accommodating various operational needs.
• Available with the flexibility of closed or semi-open impellers to suit specific application requirements.
• Back pull out design ensures maintenance is swift and straightforward, minimizing downtime.
• Handles a maximum fluid temperature of 175°C, suitable for high-temperature applications.
• Features a heavy-duty shaft that remains isolated from the fluid, enhancing durability and longevity.
• Equipped with an external seal cooling system to maintain optimal operational conditions.
• Distinct independent pump and motor shafts for maintenance ease and operational reliability.
• Available in a variety of materials: cast iron, 316 stainless steel, duplex stainless steel, bronze, and more upon request, offering customizable solutions.
• Suction and discharge flanges adhere to EN 1092-2 / PN 16 standards, with options for EN 1092-1 / PN 16 for steel and stainless steel casings for secure installation.
• Offers a range of sealing options including gland packing, single, double, and cartridge mechanical seals to fit diverse application needs.
• Compatible with three-phase 50hz / 60hz motors, with IP55 protection as standard, ensuring robust performance.
• ATEX-certified versions available upon request, meeting safety standards for explosive atmospheres.
• Independent certification available upon request, providing assurance of compliance and quality.
• Manufactured in compliance with EN 22858 / ISO 2858 standards, ensuring high quality and reliability.
• Designed with low NPSH characteristics to prevent cavitation and enhance pumping efficiency.
• Facilitates easy assembly without the need for alignment, streamlining installation and setup.
• All impellers are precision-balanced according to ISO 1940 class 6.3, ensuring smooth operation and reduced vibration.
• Long coupled design complete with baseplate, ensuring stability and ease of installation.
• Option to install an API Seal compliant with API 682 for enhanced sealing performance in rigorous applications.
• Features oil-lubricated ball bearings, offering reliable performance and reduced wear and tear.
| Pump Type |
Centrifugal |
| Max Flow Rate |
1500M³H |
| Max Head |
160M |
| Max Temp |
175°C |
| Max Viscosity |
200 cst |
| Max Solid Passage |
20mm |
| Self Priming |
N |
| Inlet/Outlet Sizes |
32mm to 250mm |
| Mechanical seal type |
Double mechanical seal, API plan |
| Pump Materials |
AISI304, AISI316, AISI316L, Bronze, Cast Iron, Cast Steel, Ductile Iron, Duplex, NiAl Bronze, Super Duplex |
Our centrifugal and chemical pumps proudly boast the integration of famous brand Bearings, ensuring extraordinary durability. Even in the most challenging environments, users can count on an extended service life, setting a new standard for reliability and performance.
To expertly balance axial thrust, our innovative design incorporates wear rings both in front and behind the majority of the impeller. Additionally, a precision-engineered balance hole is crafted into the back shroud of the impeller. For pumps where axial thrust is minimal, we thoughtfully omit the back wear ring and balance hole, achieving an optimal configuration.
Our high-precision casting impeller promises exceptional performance, with options crafted in robust materials such as cast iron, stainless steel, and bronze. This ensures resilience and efficiency tailored to meet diverse industrial demands.
There are generally two main groups:
1) "Flush" - By injecting clean, cool liquid into the seal chamber, the operational environment is significantly enhanced. A secondary, strategically oriented port serves as a vital leakage observation or vent point, ensuring peak performance.
2) "Barrier or Buffer" for dual seals - A secondary fluid is introduced into the inter-seal space, effectively blocking ambient air from the pumped fluid, optimizing seal cooling, and bolstering operational safety.
Interestingly, not every mechanical seal demands intricate external flush arrangements—streamlined efficiency at its best.
Flexible couplings
Flexible couplings, unlike their rigid counterparts, are designed to handle movement such as vibrations and thermal expansion with ease and without damage. Their ability to accommodate unavoidable misalignments makes them indispensable, especially as they effectively absorb vibrations and reduce operating noise, albeit at a slightly higher design complexity and cost. In the long term, the maintenance savings achieved by protecting the shafts and bearings from damage and premature wear greatly outweigh these costs.
Our Semhai API standard chemical pumps proudly incorporate API 671 Standard Disc Couplings.
This design excels with lower reaction loads and superior balancing quality, surpassing typical couplings. It enhances the pump’s overall power transmission efficiency and effectiveness, making it a powerful choice for optimal performance.
| Industry |
Services |
| Chemicals, dyes & intermediates |
Organic/inorganic chemicals |
| Oil extraction & waste oil refineries |
Hydrocarbons/Volatile liquids |
| Bulk drugs & Pharmaceuticals |
Dyes & Intermediates |
| Effluent treatment plants |
Water treatment & distribution system |
| Heating & air conditioning plants |
Thermic fluid/ hot oil |
| Cooling towers |
Corrosive/abbrasive liquids |
Professional Cooperation Agencies
This esteemed company, Shanghai Semhai Pump Co., Ltd., has forged robust and enduring partnerships with a host of prominent domestic pump-testing institutions, ensuring exceptional standards and unparalleled quality that our valued clients have come to expect. Notable collaborations include:
The prestigious National Quality Supervision and Inspection Center of Industrial Pumps located in Tiexi District, Shengyang City, a beacon of excellence in quality assurance.
The Irrigation Machinery Products Quality Inspection Center of Machinery Industrial in Zhenjiang City, renowned for its thorough and meticulous quality inspections.
The Ministry of Agriculture, Water Pump Quality Supervision and Testing Center in Chongqing City, exemplifying rigorous testing and quality control.
The Shanghai Mechanical and Electrical Products Quality Inspection Center, situated in the heart of Shanghai City, providing comprehensive evaluations and assessments, and much more.
Audited Supplier 
){kind=link}