The SLZ end suction, long-coupled, single-stage centrifugal chemical process pump is meticulously standardized to EN 22858 / ISO 2858. This marvel of engineering versatility is crafted for an extensive array of applications within the industrial and marine sectors. Expertly designed to handle low viscosity clean or slightly contaminated fluids, it efficiently manages liquids devoid of fibrous or solid matter. Whether tasked with transferring fresh water, sea water, or fuels such as diesel, petrol, and kerosene, the SLZ excels. It is the cornerstone of operations in fuel transfer, chemical processing, energy plants, mining ventures, fire fighting, irrigation, general water supply, sophisticated water treatment, pressurization, grey water management, dewatering, and marine applications.
Introducing our large, heavy-duty centrifugal chemical process pump, engineered to deliver exceptional high flow and high pressure capabilities, meeting demanding requirements with unmatched performance.
The long-coupled centrifugal chemical process pump design offers an abundance of benefits that elevate operational efficiency.
Thanks to its long-coupled configuration, maintenance is simplified. The pump head is easily accessible without the need to detach the motor, streamlining routine upkeep.
This process pump boasts an outstanding robustness, purposefully crafted for continuous operation. Additional bearings within the pump head alleviate motor strain, ensuring longevity and reliability during demanding tasks.
With a back pull-out design, the motor can be detached seamlessly while keeping the pump connected to the pipework, substantially reducing downtime during service or maintenance.
Distinctively designed with independent shafts for the pump and motor, this feature ensures that in the event of a pump shaft failure, only the pump shaft requires replacement, unlike other chemical process pumps where a motor shaft failure necessitates full motor replacement.
The long-coupled architecture provides ample space between the pump and motor, effectively safeguarding the motor from potential fluid ingress in the unfortunate event of seal failure.
Product Summary
• Capable of pumping a diverse range of clean low viscosity or slightly contaminated fluids, ensuring versatility in operation.
• Available with either closed or semi-open impeller designs to suit various application needs.
• Features a back pull-out design that guarantees quick and straightforward maintenance procedures.
• Handles fluid temperatures up to an impressive 175°C, accommodating high-temperature applications.
• Equipped with a heavy-duty shaft that remains untainted by the fluid, ensuring durability.
• Offers an external seal cooling system to maintain optimal operational temperature.
• Incorporates independent pump and motor shafts for targeted and efficient repairs.
• Constructed in materials like cast iron, 316 stainless steel, duplex stainless steel, bronze, and more upon request, tailored to specific industrial needs.
• Suction and discharge flanges comply with EN 1092-2 / PN 16 standards. For steel and stainless steel casings, flanges meet EN 1092-1 / PN 16 specifications.
• Choose from gland packing or single, double, and cartridge mechanical seal options to suit sealing requirements.
• Powered by three-phase 50Hz / 60Hz motors, with IP55 as standard, ensuring robust performance.
• ATEX version available upon request, tailored for explosive atmospheres.
• Independent certification is accessible upon request, reinforcing credibility and quality assurance.
• Crafted in adherence to EN 22858 / ISO 2858 standards, ensuring reliability and conformity.
• Low NPSH feature for enhanced operation in varied conditions.
• Designed for assembly without alignment, facilitating ease of installation.
• All impellers are meticulously balanced according to ISO 1940 class 6.3, ensuring smooth and stable operation.
• Long-coupled configuration with a sturdy baseplate, providing stability and support.
• Option to install an API Seal, conforming to API682 standards for enhanced sealing performance.
• Equipped with oil-lubricated ball bearings, ensuring smooth and reliable operation over extended periods.
| 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 proudly incorporate renowned brand bearings, ensuring outstanding durability and performance. Even under the most demanding conditions, these bearings contribute to a significantly extended service life, making our pumps a reliable choice for challenging applications.
To skillfully counterbalance axial thrust, most impellers are equipped with wear rings strategically placed at both the front and back. Additionally, a balance hole is positioned on the rear shroud. However, in instances where the axial thrust of certain pumps is minimal, the design is innovatively streamlined without the need for a rear wear ring or balance hole.
Our high-precision casting impellers assure superior performance across a spectrum of materials, including cast iron, stainless steel, and bronze, for unmatched reliability and versatility.
There are generally two main groups:
1) "Flush" - This approach introduces a clean, cool liquid into the seal chamber, effectively enhancing the operational environment. A secondary, smaller port, typically oriented downward, serves as an observation point or vent, allowing for simple monitoring of potential leakage.
2) "Barrier or Buffer" with dual seals - A secondary fluid is strategically utilized between two sets of mechanical seals. This method prevents ambient air from interacting with the pumped fluid, significantly improving seal cooling and boosting safety measures.
It is noteworthy that not all mechanical seals necessitate specialized external flush configurations, simplifying maintenance in many cases.
Flexible couplings
Flexible couplings, unlike their rigid counterparts, gracefully accommodate movement such as vibrations and thermal expansion, making them ideal for scenarios where shaft alignment isn't perfect. Their ability to absorb vibrations not only minimizes operational noise but also safeguards shafts and bearings from damage, leading to potential long-term maintenance savings despite their initially more complex and costly design.
Semhai's API standard chemical pumps feature API 671 Standard Disc Couplings, setting a benchmark in performance and reliability.
These couplings offer reduced reaction loads and superior balancing quality compared to ordinary couplings, thus maximizing efficiency and effectiveness for complete pump power transmission.
| 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 enduring partnerships with several major domestic pump-testing institutions, ensuring the utmost reliability and performance of our pumps. Our exceptional collaborations include:
The prestigious National Quality Supervision and Inspection Center of Industrial Pumps located in Tiexi District, Shenyang City,
The esteemed Irrigation Machinery Products Quality Inspection Center of Machinery Industrial, situated in Zhenjiang City,
The renowned Ministry of Agriculture, Water Pump Quality Supervision and Testing Center based in Chongqing City,
The distinguished Shanghai Mechanical and Electrical Products Quality Inspection Center in Shanghai City, among others.
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