Negative Suction Centrifugal Pump

A crucial factor for the efficient operation of a negative suction pump is ensuring that the normal water level is in close proximity to the pump volute centerline. The NPSH, priming ability, and susceptibility to cavitation are directly influenced by the distance of the water level below the pump. In cases where the water level is significantly lower, centrifugal pumps struggle to operate as the suction line losses, including negative head or suction lift and friction losses, approach the equivalent of one atmosphere. This limitation arises when the vapor pressure of the liquid reaches atmospheric pressure, preventing the pump from effectively lifting the fluid. An instance where this problem occurred was with our large temporary bypass sewage pumps, which were positioned 24 feet above the fluid level. Unfortunately, these pumps experienced severe cavitation, leading to their inefficiency and failure.

To avoid the suction line from running dry, there are several ways to ensure that it remains water-filled. These methods include using a priming mechanism, an eductor, a vacuum pump, or a foot valve in the suction line. One effective approach we've used is the venturi-style eductors, which work by drawing a vacuum using high-pressure service water to maintain the pump volute full. Another reliable solution suggested in Marks' Standard Handbook for Mechanical Engineers is to employ a priming chamber. By embracing these methods, the suction line is guaranteed to remain filled with water, ensuring the smooth operation of the pump.

Product Specification

Structure: Single-stage double-suction;

Flow rate: ≤ 4000 m³/h;

Head: ≤ 100 m;

Standard: ISO2548C/GB3216C/GB/T 5657;

Working pressure: 1.6 MPa/2.5 MPa;

Working temperature: ≤100 ℃;

Motor power: ≤900 kw;

Outlet Caliber: DN125~DN500;

Speed: 990 rpm, 1480 rpm, 2960 rpm;

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Structure

Application

Power stations, factories, mines, urban water supply and drainage, farmland irrigation and drainage, and various water conservancy projects are essential components of our infrastructure. They play a crucial role in supporting economic development and ensuring the well-being of communities. Power stations provide us with the electricity needed to power our homes, businesses, and industries. Factories and mines are responsible for producing goods and extracting valuable resources. The urban water supply and drainage systems ensure that our cities have a reliable source of clean water and efficient wastewater management. Farmland irrigation and drainage systems help optimize agricultural productivity and conserve water resources. Lastly, water conservancy projects aim to manage water resources sustainably and mitigate the risks of floods and droughts. These various infrastructural elements work in harmony to support our society and drive progress.

QA&QC

We have a range of certifications and reports available for our products. This includes test reports, product certification, and third-party certification. Our extensive documentation ensures that our customers have access to all the necessary information about the quality and compliance of our products. The test reports provide detailed analysis and evaluation of the performance and safety features of our products. Product certification indicates that our products meet specific standards and regulations set by relevant authorities. Additionally, we also offer third-party certification, which further validates the quality and reliability of our products. Our certifications and reports are essential for maintaining transparency and trust with our customers and ensuring that our products consistently meet the highest industry standards.

Packing, Storage, Handling and Transportation

The plywood cases with fixed timbers and plastic film inside will be used to pack a single set of pump.

Our factory will conduct a container loading inspection to ensure that all items are packed correctly and without causing any damage. The purpose of this inspection is to guarantee that our products are safely transported without any harm.

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