Introducing the remarkable SLZ end suction, long coupled, single stage centrifugal chemical process pump, meticulously standardized to EN 22858 / ISO 2858. This versatile powerhouse is engineered for an extensive array of applications across industrial and marine markets. Expertly crafted to handle low viscosity clean or slightly contaminated fluids, devoid of solid or fibrous matter, it excels in pumping fresh water, sea water, and diverse fuels such as diesel, petrol, and kerosene. Its robust design makes it ideal for a multitude of applications, including fuel transfer, chemical processes, energy plants, mining, fire fighting, irrigation, water supply, water treatment, pressurization, grey water management, dewatering, and marine operations.
This pump is an engineering marvel—a large, heavy-duty centrifugal chemical process pump with exceptional high flow and high pressure performance, setting a benchmark in reliability and efficiency.
The ingenious long coupled centrifugal chemical process pump design offers a multitude of advantageous benefits, enhancing operational ease and dependability.
The long coupled configuration is a testament to maintenance simplicity, allowing easy access to the pump head while leaving the motor intact, minimizing downtime and effort.
Engineered for robustness and longevity, this process pump is designed for relentless continuous use. Thanks to the additional bearings installed in the pump head, significant strain is alleviated from the motor during operation, ensuring durability.
The sophisticated back pull-out design facilitates effortless motor removal without disconnecting the pump from the pipework, saving valuable time during service or maintenance.
Featuring independent shafts for the pump and motor, this design innovation means only the pump shaft requires replacement in case of a breakage, unlike less robust models where the entire motor shaft would need substitution.
The long coupled design ingeniously provides ample space between the pump and motor, safeguarding the motor from fluid ingress in the event of seal failure, enhancing reliability.
Comprehensive Product Summary
• Capable of efficiently pumping a diverse range of clean low viscosity or slightly contaminated fluids.
• Offered with both closed and semi-open impeller configurations for optimal performance.
• Back pull-out design ensures quick, hassle-free maintenance, enhancing serviceability.
• Handles maximum fluid temperatures up to an impressive 175°C.
• Features a heavy-duty shaft ingeniously designed to remain free from fluid contact.
• Equipped with an optional external seal cooling system for enhanced operational efficiency.
• Engineered with independent pump and motor shafts for increased reliability.
• Available in a variety of materials including cast iron, 316 stainless steel, duplex stainless steel, bronze, and more upon request.
• Suction and discharge flanges adhere to EN 1092-2 / PN 16 standards, with alternatives available for steel and stainless steel casings.
• Options for gland packing or highly efficient single, double, and cartridge mechanical seals.
• Equipped with three-phase 50Hz / 60Hz motors, IP55 rated as standard, ensuring robust performance.
• ATEX version available upon request, catering to specialized operational requirements.
• Independent certification available upon request, reinforcing quality assurance.
• Meticulously manufactured in accordance with EN 22858 / ISO 2858 standards, ensuring top-tier quality.
• Low NPSH for optimal performance efficiency.
• Assembly process designed to eliminate the need for alignment, simplifying installation.
• All impellers are precisely balanced according to ISO 1940 class 6.3, ensuring smooth operation.
• Expertly long coupled with a baseplate for enhanced stability and performance.
• Capable of API Seal installation, in compliance with API682 standards, for superior seal integrity.
• Oil-lubricated ball bearings deliver exceptional durability and smooth operational performance.
| 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 and chemical pumps proudly feature renowned brand bearings, ensuring superior performance and an extended lifespan even under the most challenging conditions. These bearings are a testament to our commitment to quality and reliability, promising endurance and durability in our pumps.
To expertly manage axial thrust, our sophisticated design incorporates wear rings strategically placed at both the front and rear of most impellers, coupled with a balance hole on the back shroud. For pumps with minimal axial thrust, the streamlined design omits the rear wear ring and balance hole, optimizing efficiency while maintaining performance.
Our high-precision casting impeller, crafted from premium materials such as cast iron, stainless steel, and bronze, guarantees exceptional performance and reliability, embodying the pinnacle of engineering excellence.
Our mechanical seal systems are categorized into two primary groups:
1) "Flush" - This system injects clean, cool liquid directly into the seal chamber, significantly enhancing the operational environment. An additional smaller port, typically positioned downward, serves as a convenient leakage observation or vent opening, ensuring optimal system monitoring.
2) "Barrier or Buffer" for dual seals - A secondary fluid is introduced into the space between the two sets of mechanical seals. This innovative approach prevents ambient air from contacting the pumped fluid, thereby improving seal cooling and significantly boosting safety standards.
It is important to note that not all mechanical seals necessitate specialized external flush arrangements, underscoring their versatility and adaptability to various applications.
Flexible Couplings
In contrast to rigid couplings, flexible couplings are engineered to accommodate movement such as vibrations and thermal expansion, making them indispensable for applications with unavoidable misalignment between drive and pump shafts. Their vibration-absorbing capabilities also help reduce operational noise. While the design is more complex and costly, the long-term maintenance savings due to protection against shaft and bearing damage make them a wise investment.
Our Semhai API standard chemical pumps are equipped with API 671 standard disc couplings, showcasing superior technology and design.
These couplings boast reduced reaction loads and superior balancing quality compared to conventional 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. has forged long-standing alliances with numerous leading domestic pump-testing institutions, ensuring our products meet the highest standards.
Notably, we collaborate with the renowned National Quality Supervision and Inspection Center of Industrial Pumps located in Tiexi District, Shengyang city.
Our partnerships extend to the esteemed Irrigation Machinery Products Quality Inspection Center of Machinery Industrial in Zhenjiang City.
We are also associated with the Ministry of Agriculture's authoritative Water Pump Quality Supervision and Testing Center in Chongqing city.
Furthermore, we work closely with the prestigious Shanghai Mechanical and Electrical Products Quality Inspection Center, based in Shanghai city, among others.
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