Presenting the SLZ end suction, long-coupled, single-stage centrifugal chemical process pump, meticulously standardized to the globally recognized EN 22858 / ISO 2858 standards. This powerhouse pump caters to a multitude of applications within the industrial and marine sectors. Expertly engineered to handle low-viscosity clean or slightly contaminated liquids, devoid of solid or fibrous contaminants, it excels in pumping a variety of fluids such as fresh water, sea water, and an array of fuels including diesel, petrol, and kerosene. Its versatility shines in applications ranging from fuel transfer and chemical processing to energy plant operations, mining, firefighting, irrigation, water supply, treatment, pressurization, grey water management, dewatering, and marine endeavors.
This formidable centrifugal chemical process pump is designed for heavy-duty applications, boasting impressive high flow and high pressure capabilities.
The long-coupled centrifugal chemical process pump design is packed with numerous advantageous features.
Thanks to its long-coupled configuration, maintenance becomes a breeze, allowing easy access to the pump head without the need to detach the motor.
Engineered for endurance, this process pump is robust, tailored for continuous operation. Its design incorporates additional bearings in the pump head, significantly reducing the strain on the motor during active usage.
The innovative back pull-out design permits the motor's removal while the pump remains connected to the pipework, translating into significant time savings during maintenance or servicing.
Featuring independent shafts for both the pump and motor, this design ensures that only the pump shaft requires replacement in case of breakage, unlike less robust models that necessitate motor replacement when the shaft fails.
The long-coupled design provides ample space between the pump and motor, effectively shielding the motor from fluid intrusion in the event of seal failure.
Product Summary
• Capable of handling an extensive array of low-viscosity clean or slightly contaminated fluids
• Available with closed or semi-open impeller configurations
• Features a back pull-out design for swift and straightforward maintenance
• Capable of withstanding maximum fluid temperatures up to 175°C
• Equipped with a heavy-duty shaft that remains isolated from fluid contact
• Offers an external seal cooling system
• Distinctive independent pump and motor shafts
• Available in materials such as cast iron, 316 stainless steel, duplex stainless steel, bronze, and more upon request
• Suction and discharge flanges comply with EN 1092-2 / PN 16, and EN 1092-1 / PN 16 for steel and stainless steel casings
• Options for gland packing or single, double, and cartridge mechanical seals
• Three-phase motors available at 50hz / 60hz with IP55 as standard
• ATEX-compliant version available upon request
• Independent certification can be provided upon request
• Manufactured in strict accordance with EN 22858 / ISO 2858 standards
• Features low NPSH
• Facilitates assembly without alignment issues
• All impellers are precision-balanced to ISO 1940 class 6.3 standards
• Long-coupled with a sturdy baseplate
• Capable of installing an API Seal in compliance with API682 standards
• Equipped with oil-lubricated ball bearings
| 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 renowned brand bearings, ensuring exceptional durability and reliability. These pumps are engineered to thrive, even in the most demanding conditions, promising an extended lifespan.
To effectively manage axial thrust, our impeller designs feature wear rings at both the front and rear, complemented by a strategically positioned balance hole on the back shroud. In instances where axial thrust is minimal, the rear wear ring and balance hole are omitted, optimizing efficiency.
Crafted through high-precision casting, our impellers guarantee superior performance, available in premium materials such as cast iron, stainless steel, and bronze.
Typically, two principal categories are defined:
1) “Flush” - This involves injecting a pristine, cool liquid into the seal chamber to enhance operational conditions. A secondary, smaller port, usually positioned downward, facilitates leakage monitoring or functions as a vent.
2) “Barrier or Buffer” for dual seals - A secondary fluid is introduced between two mechanical seals, effectively isolating the pumped fluid from ambient air, boosting seal cooling, and elevating safety standards.
It's important to note that not all mechanical seals necessitate specialized external flush systems.
Adaptable Couplings
Flexible couplings, unlike their rigid counterparts, adeptly handle movements such as vibrations and thermal expansion without incurring damage. They are perfect for situations with unavoidable misalignments between drive and pump shafts. These couplings excel in absorbing vibrations, thereby minimizing excessive noise while offering a more sophisticated design. Despite their complexity and cost, the long-term maintenance savings due to protection against shaft and bearing damage are significant.
Our Semhai API standard chemical pumps are equipped with API 671 Standard Disc Couplings.
These couplings boast reduced reaction loads and superior balancing quality compared to conventional couplings, thus enhancing the pump's overall power transmission efficiency and performance.
| 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
This esteemed company, Shanghai Semhai Pump Co., Ltd., has forged enduring and strategic partnerships with an array of prestigious, large-scale domestic pump-testing institutions. These alliances underscore our commitment to excellence and innovation:
National Quality Supervision and Inspection Center of Industrial Pumps, located in Tiexi District, Shengyang City, renowned for its comprehensive quality assessments and technological advancements,
Irrigation Machinery Products Quality Inspection Center of Machinery Industrial, situated in Zhenjiang City, recognized for its meticulous quality control and pioneering research,
Ministry of Agriculture, Water Pump Quality Supervision and Testing Center, based in Chongqing City, distinguished for its rigorous standards and cutting-edge testing facilities,
Shanghai Mechanical and Electrical Products Quality Inspection Center, right at the heart of Shanghai City, celebrated for its exceptional expertise and state-of-the-art inspection capabilities, and many more illustrious institutions.
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