The SLZ series signifies excellence with its end suction, long coupled, single-stage centrifugal chemical process pump, meticulously crafted to meet the EN 22858 / ISO 2858 standards. Embark on a journey of versatility as this powerhouse serves an extensive range of industrial and marine applications. Designed to seamlessly handle low viscosity clean or slightly contaminated fluids, it excels in scenarios free from solid or fibrous debris. Ideal for fresh or sea water and various fuels like diesel, petrol, and kerosene, it finds its purpose in fuel transfer, chemical and energy plants, mining, firefighting, irrigation, water supply, water treatment, pressurisation, grey water management, dewatering, and marine applications.
Introducing a robust, large-scale centrifugal chemical process pump, engineered for high flow and pressure capacity, meeting demanding industrial needs with grace.
The innovative long coupled centrifugal chemical process pump design offers a multitude of advantages, enhancing operational efficiency and reliability.
Experience unparalleled ease of maintenance with the long coupled configuration, allowing effortless access to the pump head without motor removal.
Engineered for durability, this pump thrives in continuous use. With additional bearings strategically placed within the pump head, the strain on the motor is significantly reduced, ensuring longevity and robust performance.
The back pull-out design empowers rapid motor detachment while the pump remains connected to the pipework, facilitating time-efficient service and maintenance routines.
Distinctively engineered with independent shafts, the centrifugal chemical process pump ensures that only the pump shaft requires replacement upon failure, eliminating the need for entire motor replacement, a common issue in less durable models.
The long coupled design provides ample space between the pump and motor, safeguarding the motor from fluid exposure in the event of seal failure, thus enhancing protection and reliability.
Product Summary
• Capable of processing a diverse array of clean, low viscosity, or mildly contaminated fluids with efficiency.
• Configurable with either closed or semi-open impeller to suit various pumping needs.
• Back pull-out design ensures swift and straightforward maintenance operations.
• Operates effectively with a maximum fluid temperature of 175°C, catering to high-temperature requirements.
• Features a heavy-duty shaft that remains untouched by the fluid, enhancing durability.
• Equipped with an optional external seal cooling system for optimal performance under intense conditions.
• Incorporates independent pump and motor shafts for enhanced reliability and ease of maintenance.
• Constructed from materials like cast iron, 316 stainless steel, duplex stainless steel, bronze, and more upon request, ensuring customization and resilience.
• Suction and discharge flanges adhere to EN 1092-2 / PN 16, with options for EN 1092-1 / PN 16 for steel and stainless steel casings, ensuring robust connectivity.
• Offers diverse sealing options: gland packing or single, double, and cartridge mechanical seals available.
• Powered by three-phase motors, available in 50Hz / 60Hz, with IP55 protection as standard, ensuring adaptability and safety.
• ATEX-certified versions available upon request, meeting stringent safety and operational standards.
• Independent certification can be provided upon request, assuring compliance and quality.
• Crafted in strict accordance with EN 22858 / ISO 2858 standards, symbolizing precision and excellence.
• Minimizes Net Positive Suction Head (NPSH), enhancing efficiency and preventing cavitation.
• Designed for assembly without alignment, simplifying installation and reducing setup time.
• Ensures all impellers are precisely balanced to ISO 1940 class 6.3, providing smooth operation.
• Long coupled with baseplate, ensuring stability and ease of installation.
• Compatible with API Seal installation, following API682 standards to meet industry requirements.
• Employs oil-lubricated ball bearings, promoting smooth and reliable operation over time.
| 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 are equipped with the renowned and high-quality bearings that are synonymous with durability. These bearings promise an extended service life, even when faced with the most challenging operating conditions. Built to withstand the harshest environments, our pumps offer longevity and reliable performance.
To expertly manage axial thrust, a sophisticated design is implemented: wear rings are strategically placed at the front and rear of most impellers, complemented by a balance hole on the back shroud. For certain pumps where axial thrust levels are minimal, the design is optimized with the exclusion of rear wear rings and balance holes, ensuring efficiency and performance without unnecessary components.
Our impellers are crafted with precision casting, ensuring top-tier performance across materials such as cast iron, stainless steel, and bronze. This meticulous engineering guarantees that each pump reaches its peak performance and durability.
Our innovative sealing solutions can be categorized into two primary configurations:
1) "Flush" - This approach utilizes a clean, cool liquid injected into the seal chamber to create an optimal operating environment. Featuring a secondary port typically positioned downward, it doubles as a useful leakage observation or vent opening, maintaining seal integrity.
2) "Barrier or Buffer" - Designed for dual seal systems, this method employs a secondary fluid introduced between two mechanical seals. This configuration not only prevents atmospheric air from mingling with the pumped fluid but also significantly enhances seal cooling and boosts safety standards.
It is crucial to note that not all mechanical seals require specialized external flush arrangements, allowing for simplicity and cost-effectiveness in certain applications.
Flexible couplings
Flexible couplings, unlike their rigid counterparts, are engineered to accommodate movements such as vibrations and thermal expansion. This adaptability makes them the perfect choice for applications with unavoidable shaft misalignment. Their capability to mitigate vibrations also helps in reducing operational noise levels, offering a quieter and smoother experience. Although their design is more complex and costly, the long-term maintenance savings and protection they provide for shafts and bearings from damage and premature wear are invaluable.
The Semhai API standard chemical pumps proudly incorporate API 671 Standard Disc Couplings, ensuring superior compatibility and performance.
These couplings are designed to deliver minimal reaction loads while achieving superior balancing quality. This results in enhanced efficiency and effectiveness for the entire pump power transmission system, offering a seamless operation experience.
| 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 robust, long-term collaborative partnerships with esteemed domestic pump-testing institutions. These alliances ensure precision and reliability in our product offerings, including:
The National Quality Supervision and Inspection Center of Industrial Pumps (Tiexi District, Shengyang City), a beacon of excellence in pump evaluation.
The Irrigation Machinery Products Quality Inspection Center of Machinery Industrial (Zhenjiang City), renowned for its meticulous inspection processes.
The Ministry of Agriculture, Water Pump Quality Supervision and Testing Center (Chongqing City), a leading authority in agricultural pump assessments.
The Shanghai Mechanical and Electrical Products Quality Inspection Center (Shanghai City), a cornerstone for quality assurance in mechanical and electrical assessments, and many more.
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