Introducing the SLZ end suction, long coupled, single stage centrifugal chemical process pump, a masterpiece crafted for the industrial and marine markets. Adhering to the esteemed standards of EN 22858 / ISO 2858, this versatile powerhouse is engineered for a multitude of applications. It expertly handles low viscosity clean or slightly contaminated fluids, absent of solid or fibrous materials. Whether it's fresh water, seawater, or fuel types like diesel, petrol, and kerosene, this pump stands ready. Its diverse utilization spans fuel transfer, chemical processes, energy plants, mining, fire fighting, irrigation, water supply, water treatment, pressurization, grey water, dewatering, and marine operations.
Experience the might of a large, heavy duty centrifugal chemical process pump designed for supreme performance. With high flow and high pressure capabilities, it is built for demanding applications.
Discover the multitude of advantages offered by the long coupled centrifugal chemical process pump design.
Thanks to its long coupled configuration, maintaining this pump is a breeze. Gain hassle-free access to the pump head without the need to remove the motor, simplifying maintenance.
Built for resilience, this robust pump is engineered for continuous use. Extra bearings in the pump head significantly reduce motor strain during operation, ensuring longevity and reliability.
The innovative back pull out design allows seamless motor removal while keeping the pump connected to the pipework. This feature is a time-saver during service and maintenance procedures.
With independent shafts for the pump and motor, only the pump shaft requires replacement if broken. Unlike less robust designs relying solely on motor shafts, this configuration prevents the need for entire motor replacement in case of a shaft failure.
The strategic long coupled design provides ample space between the pump and motor, safeguarding the motor from fluid ingress in the event of seal failure.
Product Summary
• Handles a wide range of clean or slightly contaminated, low viscosity fluids with ease.
• Offers a choice of closed or semi open impeller to suit diverse needs.
• Features a back pull out design for swift and effortless maintenance.
• Capable of handling fluids with temperatures reaching up to 175°C.
• Equipped with a heavy duty shaft that remains untouched by the fluid.
• Includes an external seal cooling system for enhanced performance.
• Designed with independent pump and motor shafts for added reliability.
• Available in materials like cast iron, 316 stainless steel, duplex stainless steel, bronze, and more upon request.
• Suction and discharge flanges comply with EN 1092-2 / PN 16 standards, with options for EN 1092-1 / PN 16 for steel and stainless steel casings.
• Offers gland packing or various mechanical seal options, including single, double, and cartridge.
• Compatible with three-phase 50Hz / 60Hz motors, IP55 as standard.
• ATEX version available upon request for specialized needs.
• Independent certification available upon request to ensure quality.
• Manufactured in strict adherence to EN 22858 / ISO 2858 standards.
• Features low NPSH for efficient operation.
• Assembles seamlessly without the need for alignment.
• All impellers are precision balanced according to ISO 1940 class 6.3.
• Designed with a long coupled baseplate for stability.
• Capable of installing an API Seal, conforming to API682 standards for enhanced sealing options.
• Utilizes oil-lubricated ball bearings for smooth and efficient operation.
| 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 our chemical pumps, proudly incorporate renowned brand bearings, ensuring superior durability. These bearings contribute to an extended service life, even under demanding operational conditions.
To expertly manage axial thrust, our pumps feature dual wear rings both at the front and rear of the impeller, accompanied by a balance hole strategically located on the back shroud. In certain models where axial thrust is minimal, the design is optimized to exclude the rear wear ring and balance hole.
Our precision-crafted impellers promise exceptional performance and are available in robust materials such as cast iron, stainless steel, and bronze.
We classify them into two principal categories:
1) "Flush" - This method delivers a stream of clean, cool liquid into the seal chamber, optimizing the operational environment. A secondary, smaller downward-facing port often functions as a leak observation point or vent.
2) "Barrier or Buffer" with dual seals - This technique introduces a secondary fluid between two mechanical seals, preventing ambient air intrusion and enhancing cooling and safety.
It's important to note that not all mechanical seals necessitate specialized external flush systems.
Flexible couplings
In contrast to rigid alternatives, flexible couplings adeptly accommodate slight movements, such as vibrations and thermal expansions, safeguarding against damage. They are ideal for scenarios with minor misalignment between drive and pump shafts, and their vibration-absorbing qualities significantly reduce operational noise. Though they entail a more intricate and costly design, their ability to protect shafts and bearings translates into long-term maintenance savings.
Semhai API standard chemical pumps are engineered with API 671 Standard Disc Couplings.
Our couplings deliver reduced reaction loads paired with superior balancing quality compared to conventional couplings, significantly boosting 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. proudly maintains robust, long-standing partnerships with a multitude of prominent domestic pump-testing institutions, such as:
The prestigious 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 in Zhenjiang City,
The esteemed Ministry of Agriculture, Water Pump Quality Supervision and Testing Center, found in Chongqing City,
And the distinguished Shanghai Mechanical and Electrical Products Quality Inspection Center, situated in Shanghai City, among others.
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