Introducing the SLZ end-suction, long-coupled, single-stage centrifugal chemical process pump—an engineering marvel crafted to meet industry standards EN 22858 / ISO 2858. Designed for versatility, this pump excels in both industrial and marine applications. It effortlessly handles low-viscosity, clean, or slightly contaminated fluids, devoid of solids or fibrous materials. Fresh water, sea water, diesel, petrol, kerosene—this pump tackles them all with ease. Its realm of applications spans from fuel transfer, chemical handling, and energy plants to mining, firefighting, irrigation, water supply, treatment, pressurization, grey water management, dewatering, and marine operations.
Behold a large, heavy-duty centrifugal chemical process pump, engineered for exceptional high flow and high-pressure performance.
The long-coupled centrifugal chemical process pump design offers a multitude of advantages.
Experience unmatched maintenance convenience with the long-coupled configuration, allowing easy access to the pump head without motor removal.
Built for endurance, this robust pump is designed for continuous operation, featuring additional bearings in the pump head to alleviate motor strain.
The ingenious back pull-out design enables motor removal while the pump remains connected to the pipework, ensuring time-efficient servicing and maintenance.
With separate shafts for pump and motor, only the pump shaft requires replacement in case of breakage, unlike other pumps using solely the motor shaft, risking entire motor replacement upon shaft failure.
The long-coupled design provides ample space between pump and motor, safeguarding the motor from fluid ingress during seal failure.
Product Summary
• Efficiently pumps a diverse range of clean, low-viscosity, or slightly contaminated fluids.
• Available with either a closed or semi-open impeller configuration.
• Back pull-out design ensures maintenance is quick and hassle-free.
• Capable of managing fluid temperatures up to an impressive 175°C.
• Features a heavy-duty shaft isolated from fluid contact.
• Option for an external seal cooling system to enhance operation.
• Independent pump and motor shafts for efficient servicing.
• Available in materials such as cast iron, 316 stainless steel, duplex stainless steel, bronze, and more upon request.
• Suction and discharge flanges conform to EN 1092-2 / PN 16, with steel and stainless steel options to EN 1092-1 / PN 16.
• Versatile sealing options including gland packing or single, double, and cartridge mechanical seals.
• Equipped with three-phase 50hz / 60hz motors, IP55 as standard for robust performance.
• ATEX version available upon request for explosive environments.
• Independent certification can be provided to meet specific requirements.
• Manufactured in strict accordance with EN 22858 / ISO 2858 standards for assured quality.
• Features low NPSH for smooth operation.
• Designed for assembly without alignment for user convenience.
• All impellers are precision balanced according to ISO 1940 class 6.3.
• Long-coupled with an included baseplate for seamless integration.
• Compatible with API Seal installation, complying with API682 standards.
• Incorporates oil-lubricated ball bearings for reliable 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 and chemical pump products are equipped with renowned brand bearings, ensuring exceptional durability. These bearings significantly extend the service life of our pumps, even when faced with the most challenging working conditions.
Our innovative design includes wear rings at both the front and back of most impellers to expertly balance axial thrust, complemented by a strategically placed balance hole on the back shroud. For pumps where axial thrust is minimal, the back of the impeller may not feature a wear ring or balance hole.
Our high-precision casting impellers are crafted to guarantee superior performance, available in robust materials such as cast iron, stainless steel, and bronze.
Our pump systems generally fall into two primary categories:
1) "Flush" systems inject a clean, cool liquid into the seal chamber to optimize the operational environment. They include a secondary port, typically positioned downward, which functions as a leakage observation point or vent opening, offering superior maintenance insight.
2) "Barrier or Buffer" systems, utilized with dual seals, introduce a secondary fluid between two mechanical seal sets. This innovative design prevents ambient air from contacting the pumped fluid, thereby enhancing seal cooling and safety.
It's important to note that not every mechanical seal requires a specialized external flush setup, allowing for greater versatility and customization.
Flexible Couplings
Flexible couplings stand out from their rigid counterparts by accommodating movement caused by vibrations and thermal expansion without sustaining damage. Ideal for scenarios with unavoidable misalignment between drive and pump shafts, they effectively absorb vibrations to reduce operational noise. Although their intricate design is costlier, the protective benefits they offer to shafts and bearings lead to notable maintenance savings over time.
Our Semhai API standard chemical pumps incorporate the renowned API 671 Standard Disc Couplings, ensuring unmatched reliability.
These couplings offer 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. prides itself on its strong alliances, forming long-term, strategic partnerships with some of the most prestigious pump-testing institutions within the nation. These partnerships ensure top-notch quality and reliability for our products.
We collaborate closely with elite organizations such as the National Quality Supervision and Inspection Center of Industrial Pumps located in Tiexi District, Shengyang City. Our commitment to excellence is further reinforced through these premier alliances.
Our partnerships extend to the esteemed Irrigation Machinery Products Quality Inspection Center of Machinery Industrial in Zhenjiang City, guaranteeing that our products meet the highest standards of quality.
In addition, the Ministry of Agriculture, Water Pump Quality Supervision and Testing Center in Chongqing City is a key partner, ensuring our end-suction pumps are evaluated to the strictest criteria.
Moreover, we maintain a robust collaboration with the Shanghai Mechanical and Electrical Products Quality Inspection Center, located in Shanghai City, among other distinguished institutions. These relationships fortify our commitment to delivering premier quality products.
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