The SLZ end suction, long-coupled, single-stage centrifugal chemical process pump is engineered to meet the stringent standards of EN 22858 / ISO 2858. This versatile pump is perfectly suited for a myriad of industrial and marine applications. Its design ensures efficient pumping of low-viscosity fluids that are clean or only slightly contaminated, free from fibrous or solid particles. Commonly handled fluids include fresh and sea water, along with fuels such as diesel, petrol, and kerosene. Its adaptability shines in applications like fuel transfer, chemical processing, energy plants, mining operations, firefighting, irrigation, water supply, treatment, pressurization, grey water management, dewatering, and marine usage. The SLZ pump is a paragon of industrial efficiency and reliability.
This robust, large, heavy-duty centrifugal chemical process pump is designed to deliver exceptional performance with high flow rates and pressure capabilities. Its engineering excellence ensures it stands up to the demands of rigorous industrial tasks.
The design of the long-coupled centrifugal chemical process pump incorporates a multitude of benefits, making it an invaluable asset in industrial operations.
The long-coupled configuration of the pump significantly simplifies maintenance procedures, as it allows easy access to the pump head without the need to remove the motor, thus reducing downtime and maintenance costs.
This pump is built to endure, with a robust design optimized for continuous operation. Additional bearings in the pump head significantly reduce the strain on the motor, ensuring longevity and consistent performance.
Thanks to the back pull-out design, the motor can be conveniently removed while keeping the pump connected to the pipework. This feature greatly enhances service efficiency and reduces maintenance time.
The centrifugal chemical process pump boasts independent shafts for the pump and motor. This means if the pump shaft breaks, only it needs replacement, saving costs and preventing the need to replace the entire motor—a common shortfall in less robust pumps.
The long-coupled design provides ample space between the pump and motor, an essential feature that safeguards the motor from fluid ingress in the event of a seal failure, thus enhancing the longevity of the equipment.
Product Summary
• Designed to pump a wide array of clean, low-viscosity or slightly contaminated fluids with unparalleled efficiency.
• Offers flexibility with closed or semi-open impeller options to suit diverse application needs.
• The back pull-out design ensures maintenance is both quick and effortless, minimizing operational downtime.
• Capable of handling fluids at temperatures up to 175°C, catering to high-temperature industrial applications.
• Features a heavy-duty shaft that remains untouched by the fluid, ensuring durability and reliability.
• An external seal cooling system is available to maximize operational efficiency and equipment longevity.
• Independent pump and motor shafts enhance reliability by isolating failure risks to the pump shaft alone.
• Constructed in a variety of high-quality materials, including cast iron, 316 stainless steel, duplex stainless steel, and bronze, with other options available upon request.
• Suction and discharge flanges are designed to conform to EN 1092-2 / PN 16 standards, with options for steel and stainless steel casings meeting EN 1092-1 / PN 16.
• Flexible sealing options include gland packing, single, double, and cartridge mechanical seals to suit a range of requirements.
• Equipped with three-phase 50Hz / 60Hz motors, with IP55 protection as a standard feature for reliable operation.
• An ATEX version is available upon request for operations in explosive atmospheres.
• Independent certification can be procured on request to assure quality and compliance with industry standards.
• Manufactured in strict accordance with EN 22858 / ISO 2858 standards, ensuring industry-leading quality and precision.
• Designed with low NPSH to minimize cavitation and maximize operational efficiency.
• Easy assembly without alignment requirements, reducing installation complexity.
• All impellers are meticulously balanced according to ISO 1940 class 6.3, guaranteeing smooth operation.
• Features a long-coupled design with a baseplate for enhanced stability and ease of installation.
• Capable of accommodating an API Seal in accordance with API682, further enhancing seal integrity.
• Equipped with oil-lubricated ball bearings for smooth and reliable operation over extended periods.
| 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 |
Renowned brand bearings are prominently featured in our centrifugal and chemical pump products, ensuring a remarkably extended service life, even amidst the most challenging environments.
To expertly counterbalance axial thrust, our design includes wear rings at the front and back of most impellers, accompanied by a strategically placed balance hole on the impeller’s back shroud. For pumps where axial thrust is minimal, the design intelligently eliminates the need for a back wear ring and balance hole.
Our impellers, crafted with high-precision casting, guarantee superior performance. They are available in premium materials such as cast iron, stainless steel, and bronze.
Typically, there are two principal categories:
1) "Flush" - This innovative system involves injecting clean, cool liquid into the seal chamber to optimize the operational conditions. A secondary, smaller port is strategically oriented downward, often doubling as a leakage observation point or vent opening.
2) "Barrier or Buffer" used with dual seals - A secondary fluid is ingeniously introduced between two mechanical seal sets to prevent ambient air from contacting the pumped fluid, thereby enhancing seal cooling and boosting safety.
It's crucial to note that not all mechanical seals necessitate specialized external flush arrangements.
Innovative Flexible Couplings
In contrast to rigid couplings, our flexible couplings are designed to tolerate some movements, such as vibrations and thermal expansion, without sustaining damage. This makes them perfect for scenarios with inevitable misalignment between drive and pump shafts. Their ability to absorb vibrations efficiently also serves to mitigate excessive operational noise. While their design is more intricate and costly, the long-term savings in maintenance, owing to protection from damage and premature wear of shafts and bearings, are significant.
Our Semhai API standard chemical pumps proudly incorporate API 671 Standard Disc Couplings.
These couplings boast lower reaction loads and superior balancing quality compared to standard couplings, enhancing the efficiency and effectiveness of the entire pump power transmission system.
| 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. collaborates with an elite network of professional agencies, ensuring our product excellence and technological advancement remain at the forefront of the industry.
Shanghai Semhai Pump Co., Ltd. has developed enduring partnerships with premier pump-testing institutions across the nation, including:
- National Quality Supervision and Inspection Center of Industrial Pumps in Tiexi District, Shengyang City: This esteemed institution provides meticulous inspections to uphold the quality integrity of our industrial pumps.
- Irrigation Machinery Products Quality Inspection Center of Machinery Industry in Zhenjiang City: Known for its rigorous inspection processes, this center certifies the performance and reliability of our irrigation machinery.
- Ministry of Agriculture, Water Pump Quality Supervision and Testing Center in Chongqing City: A distinguished center that ensures our water pumps meet stringent agricultural standards.
- Shanghai Mechanical and Electrical Products Quality Inspection Center in Shanghai City: A leader in quality assurance, this center validates the precision and excellence of our mechanical and electrical products.
Audited Supplier 
){kind=link}