Introducing the SLZ end suction, long coupled, single stage centrifugal chemical process pump, a pinnacle of engineering standardized to EN 22858 / ISO 2858. This versatile powerhouse is perfectly suited for an expansive range of applications within both the industrial and marine markets. Whether you need to pump low viscosity clean or slightly contaminated fluids—sans solid or fibrous particles—our pump delivers with precision. Seamlessly handle fluids such as fresh water, sea water, diesel, petrol, and kerosene. Its versatile applications span fuel transfer, chemical processing, energy plants, mining, firefighting, irrigation, water supply, water treatment, pressurization, grey water management, dewatering, and marine endeavors.
Harness the strength of a large, heavy-duty centrifugal chemical process pump, designed to excel with high flow and high pressure capabilities to meet the rigorous demands of your operations.
Experience the multitude of benefits with our long coupled centrifugal chemical process pump design, crafted for top-tier performance.
Maintenance has never been easier with the long coupled configuration, allowing direct access to the pump head without the hassle of motor removal.
Engineered for robustness and continuous use, this process pump is outfitted with additional bearings in the pump head to significantly reduce motor strain during operation, ensuring longevity and reliability.
Our innovative back pull-out design permits motor removal while the pump remains connected to the pipework, drastically reducing downtime during maintenance and service operations.
Featuring independent shafts for both pump and motor, our design ensures that only the pump shaft needs replacement if broken. This stands in stark contrast to less robust options that necessitate complete motor replacement upon shaft failure.
The long coupled design provides generous spacing between pump and motor, safeguarding the motor from fluid ingress in the event of a seal failure, enhancing durability and reliability.
Product Summary
• Capable of pumping an extensive range of clean, low viscosity, or slightly contaminated fluids
• Options include closed or semi-open impeller for tailored performance
• Back pull-out design ensures maintenance is both swift and straightforward
• Handles maximum fluid temperatures up to an impressive 175°C
• Features a heavy-duty shaft that remains free from fluid contact, enhancing longevity
• External seal cooling system available for optimized pump performance
• Independent pump and motor shafts for reduced maintenance needs
• Available in diverse materials including cast iron, 316 stainless steel, duplex stainless steel, and bronze. Custom material requests accommodated
• Suction and discharge flanges meet EN 1092-2 / PN 16 standards, with options for steel and stainless steel casings conforming to EN 1092-1 / PN 16
• Offers gland packing or a selection of single, double, and cartridge mechanical seal options
• Equipped with three phase 50hz / 60hz motors, IP55 as standard for robust performance
• ATEX version available upon request for explosive atmospheres
• Independent certification available for assurance of quality and compliance
• Crafted in accordance with the prestigious standards of EN 22858 / ISO 2858
• Low NPSH for optimal system performance
• Assembly designed without the need for alignment, simplifying installation
• All impellers meticulously balanced to meet ISO 1940 class 6.3 standards, ensuring smooth operation
• Long coupled with robust baseplate for enhanced stability and performance
• Option to install an API Seal, in full compliance with API682, for superior sealing solutions
• Oil-lubricated ball bearings for enhanced performance and durability
| 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 renowned centrifugal and chemical pumps are equipped with top-tier bearings from globally recognized brands. These premium bearings enable our pumps to operate longer in even the most challenging environments, ensuring enduring performance and robustness.
To expertly manage axial thrust, our pumps feature wear rings strategically placed at both the front and rear of the impeller, complemented by a balance hole on the impeller's back shroud. For certain models where axial thrust is minimal, these components may be absent to optimize performance and efficiency.
Our high-precision casting impellers promise impeccable performance, crafted from top-quality materials such as cast iron, stainless steel, and bronze, ensuring durability and reliability across diverse applications.
Our advanced sealing systems generally categorize into two predominant groups:
1) "Flush" - This technique involves injecting a clean, cool liquid directly into the seal chamber, significantly enhancing the operational environment. An additional secondary port, typically downward facing, serves as a vent or leakage observation point.
2) "Barrier or Buffer" for dual seals - Here, a secondary fluid is introduced between two sets of mechanical seals, effectively preventing ambient air contact with the pumped fluid. This approach not only elevates seal cooling but also substantially boosts safety.
Importantly, not all mechanical seals necessitate external flush systems, offering flexibility in design and operation.
Flexible couplings
Flexible couplings, unlike their rigid counterparts, can adeptly accommodate movements such as vibrations and thermal expansions without incurring damage. Perfect for situations with unavoidable misalignment between drive and pump shafts, they also excel in reducing excessive noise. Although they feature a more intricate and costly design, the long-term maintenance savings from protecting shafts and bearings against damage and premature wear make them a worthwhile investment.
Our Semhai API standard chemical pumps incorporate API 671 Standard Disc Couplings, epitomizing industry excellence.
Engineered for superior performance, these couplings exhibit reduced reaction loads and advanced balancing quality, significantly enhancing the pump's power transmission efficiency and overall effectiveness.
| 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
Shanghai Semhai Pump Co., Ltd. has forged strategic and enduring partnerships with several preeminent domestic pump-testing institutions, ensuring quality and excellence in all processes, such as:
The prestigious National Quality Supervision and Inspection Center of Industrial Pumps located in Tiexi District, Shengyang City;
The esteemed Irrigation Machinery Products Quality Inspection Center of Machinery Industrial situated in Zhenjiang City;
The renowned Ministry of Agriculture, Water Pump Quality Supervision and Testing Center based in Chongqing City;
And the highly regarded Shanghai Mechanical and Electrical Products Quality Inspection Center located in Shanghai City, among others.
Audited Supplier 
){kind=link}