The SLZ end suction, long coupled, single stage centrifugal chemical process pump is crafted to meet the rigorous standards of EN 22858 / ISO 2858, ensuring exceptional versatility across both industrial and marine markets. This pump is engineered to handle low viscosity clean or slightly contaminated fluids, seamlessly accommodating the absence of solid and fibrous debris. Its adaptability makes it perfect for handling fresh water, sea water, and fuels - including diesel, petrol, and kerosene. The pump finds its place in a myriad of applications such as fuel transfer, chemical processing, energy plants, mining, fire fighting, irrigation, water supply, water treatment, pressurization, grey water management, dewatering, and marine operations.
This robust centrifugal chemical process pump is built for high flow and high pressure operations, making it the perfect choice for challenging and demanding environments.
The long-coupled centrifugal chemical process pump design offers a myriad of advantages that enhance operational efficiency and ease of maintenance.
The long-coupled configuration simplifies maintenance, allowing easy access to the pump head without the need to detach the motor.
This process pump is engineered for endurance and reliability, thanks to additional bearings strategically installed in the pump head. These bearings significantly reduce motor strain, ensuring continuous and robust performance.
With its back pull out design, this pump allows the motor to be removed while keeping the pump connected to the pipework. This innovative design results in significant time savings during servicing and maintenance.
The independence of the centrifugal chemical process pump and motor shafts means only the pump shaft requires replacement in case of damage, unlike less robust pumps that necessitate replacing the entire motor if the shaft breaks.
The long-coupled design creates a significant space between the pump and motor, effectively safeguarding the motor from fluid ingress in the unlikely event of a seal failure.
Product summary
• Capable of pumping a diverse range of clean, low viscosity or slightly contaminated fluids, broadening its application scope.
• Offered with a choice of closed or semi-open impeller, catering to varied operational needs.
• Back pull out design ensures maintenance is quick and straightforward, enhancing service efficiency.
• Engineered to handle maximum fluid temperatures of up to 175°C, ensuring adaptability to high-temperature applications.
• Heavy-duty shaft design that prevents direct contact with fluid, enhancing durability and longevity.
• Equipped with an external seal cooling system, ensuring optimal performance and prolonged operational life.
• Featuring independent pump and motor shafts for simplified maintenance and reduced operational downtime.
• Available in various materials including cast iron, 316 stainless steel, duplex stainless steel, and bronze, with customizable materials upon request, catering to diverse industry needs.
• 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.
• Versatile sealing options with gland packing, single, double, and cartridge mechanical seal choices available.
• Equipped with three-phase 50Hz / 60Hz motors, featuring IP55 protection as a standard.
• ATEX-certified version available upon request, ensuring safety in explosive atmospheres.
• Independent certification available upon request, assuring quality and compliance.
• Manufactured in strict accordance with EN 22858 / ISO 2858 standards, ensuring reliability and consistency.
• Designed with a low NPSH, minimizing cavitation risk and enhancing performance.
• Facilitates assembly without the need for alignment, simplifying the installation process.
• All impellers are precision-balanced according to ISO 1940 class 6.3, ensuring smooth and efficient operation.
• Long coupled with a baseplate for sturdy installation and enhanced stability.
• Compatible with an API Seal, adhering to API682, for enhanced sealing options and performance.
• Incorporates oil-lubricated ball bearings for reduced friction and extended bearing life.
| 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 pumps, including chemical pump variants, are equipped with renowned brand bearings, ensuring exceptional durability. These bearings are expertly designed to prolong the service life of our pumps, allowing them to thrive even in the most challenging environments.
To masterfully balance axial thrust, our pumps feature wear rings both in front and at the back of most impellers, coupled with a balance hole on the impeller's back shroud. For pumps where axial thrust is minimal, the back impeller design may forgo a wear ring and balance hole, streamlining the build.
The high-precision casting of our impellers guarantees superior performance, available in robust materials such as cast iron, stainless steel, and bronze, tailored for enduring excellence.
Our product offerings are divided into two primary categories:
1) "Flush" - This method introduces clean, cool liquid into the seal chamber, enhancing the operational conditions. A secondary, smaller port, typically positioned downward, serves as a leakage observation point or vent, optimizing efficiency and safety.
2) "Barrier or Buffer" for dual seals - Here, a secondary fluid is introduced between two mechanical seals to prevent ambient air from mixing with the pumped fluid. This not only heightens seal cooling but also significantly bolsters safety and operational integrity.
Remarkably, not all mechanical seals necessitate specialized external flush systems, highlighting the adaptability of our design.
Flexible couplings
In contrast to rigid alternatives, flexible couplings are adept at accommodating certain movements such as vibrations and thermal expansion, preventing damage. They are ideally suited for applications with some misalignment between drive and pump shafts. Efficient at dampening vibrations, they effectively minimize operating noise. While their design is more intricate and costly, the savings in maintenance, due to protection of shafts and bearings from damage and wear, offer long-term economic benefits.
Our Semhai API standard chemical pumps are equipped with API 671 Standard Disc Couplings, ensuring top-tier performance.
These couplings offer reduced reaction loads and superior balancing quality compared to standard couplings, significantly enhancing the efficiency and effectiveness of the overall pump power transmission.
| 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 built enduring partnerships with several prominent domestic pump-testing institutions, ensuring the highest standards of product excellence and reliability. These collaborations include:
- The esteemed National Quality Supervision and Inspection Center of Industrial Pumps, located in Tiexi District, Shengyang City,
- The renowned Irrigation Machinery Products Quality Inspection Center of Machinery Industrial, situated in Zhenjiang City,
- The reputable Ministry of Agriculture, Water Pump Quality Supervision and Testing Center, based in Chongqing City,
- The distinguished Shanghai Mechanical and Electrical Products Quality Inspection Center, located in the vibrant Shanghai City, among others.
Audited Supplier 
){kind=link}