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Horizontal multistage centrifugal pump type D (clean water pump)

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Horizontal multistage centrifugal pump

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Pump

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Horizontal multistage centrifugal pump type D (clean water pump)

Flow: 3.6-1349m³/h

Lift height: 47-1800m

Efficiency: 33%-83%

Pump weight: 77-3750kg

NPSH (Cavitation margin): 2.0-7.0m

Motor power: 3.1-1120kw

Price: 0.59-9.77 ten thousand

The horizontal multistage pump type D is a multistage centrifugal pump with single suction and multiple sections, mainly used for water supply and drainage in industries and cities, pressurization of tall buildings, garden irrigation, fire pressurization, long-distance water transportation, heating, cold and hot water circulation in baths, and use in conjunction with equipment.

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Product description

The horizontal multistage type D pump is a segmented single-suction multistage centrifugal pump, mainly used for industrial and urban water supply and drainage, pressure boosting in high-rise buildings, garden irrigation, fire-fighting pressure boosting, long-distance water transportation, heating, cold and hot water circulation in baths, and use in auxiliary equipment. The product complies with the JB/T1051-93 standard "Basic types and parameters of multistage centrifugal pumps for clean water." The impeller is made of high-quality cast iron with internal blades; the liquid enters axially from one side only. Due to the pressure difference before and after the impeller, there is an axial force supported by the balance disk. The impeller undergoes a static balance test during manufacturing; the sealing ring is made of cast iron and fixed at the inlet and middle sections to prevent high-pressure water from returning to the inlet; the balance disk is made of wear-resistant cast iron, located between the outlet section and the rear cover, forming together with the balance ring a balancing device to compensate for the axial force.

Horizontal multistage centrifugal pump type D (clean water pump)

The structure, performance, and manufacturing process of the horizontal multistage type D pump have been perfected over years and repeatedly validated in the market, being a widely popular high-pressure centrifugal water pump with high efficiency, wide performance range, safe and stable operation, low noise, long service life, and easy installation and maintenance. Model selection is based on the lift height required by the user. Our company is a veteran manufacturer of multistage pumps, located in Changsha city, formerly part of Zhonglian Pump Industry, now independent, with over 30 years of experience in research, development, and manufacturing of multistage pumps. With strong technical capability, extensive production experience, comprehensive testing methods, and a professional design and engineering team, we have evolved into a national high-tech enterprise specializing in multistage pump equipment. All our multistage pumps are computer-designed and optimized, ensuring stable and reliable quality.

Application scope of the horizontal multistage type D pump

Suitable for transporting clean water with temperatures between -20℃ and 80℃ or media with stable physicochemical properties, with insoluble solids not exceeding 0.1% by volume and particle size ≤ 2 mm, similar to water in physicochemical properties. Besides conventional clean water transport, the horizontal multistage type D pump is commonly used in high-pressure cleaning, high-pressure reverse osmosis water transport, being a common pump for high-pressure cleaning and high-pressure water pumps for reverse osmosis.

Structural diagram and composition of the horizontal multistage type D pump

Structural diagram of multistage pump 　

Technical characteristics of the horizontal multistage type D pump

1. High efficiency and energy saving: with specialized production, model selection, mold manufacturing, and casting of hydraulic components of the horizontal multistage type D pump use unique methods. All flow passage parts are precisely cast, ensuring superior dimensions and channel finish, with an average measured performance more than 2% higher than common multistage pumps on the market, achieving good energy-saving effects;

2. Advanced equipment and processes: to ensure the assembly performance of the horizontal multistage type D pump, we import advanced foreign parts cleaning equipment. Each part is carefully cleaned before final assembly. Besides normal material tests, hydrostatic tests, and static balance tests, rotor components of pumps with more than 6 stages are inspected after partial assembly to control shaft runout within 0.05 mm, then a dynamic balance test G2.5 is performed. After full assembly, shaft runout, coupling, and axial movement are rechecked, ensuring assembly quality;

3. Unique structure: the horizontal multistage type D pump adds a type 0 sealing ring on the coupling surface of the balance ring and the pump to prevent high-pressure water from entering the balance chamber and affecting the balance effect of the balance disk, reducing disk wear and extending product life. For pumps with nominal diameter DN200 or above, a balance disk wear indicator is installed at the shaft end to monitor wear of the disk or balance ring and allow timely replacement, ensuring normal equipment operation;

4. Good surface quality: horizontal multistage type D pump uses precision mold casting process and paint applied with automatic spraying machine, achieving good surface quality and aesthetic appearance.

Structural description of the horizontal multistage type D pump

　1. The horizontal multistage type D pump is a segmented single-suction centrifugal pump, with water inlet in horizontal or vertical upward direction. Pump casing parts, such as inlet section, middle section, and outlet section, are joined by tightening bolts forming a unit. Bearing components are at both ends, and the number of pump stages is selected according to the lift height;

2. The rotor part of this pump series mainly consists of the shaft and parts mounted on it, such as the impeller, shaft sleeve, and balance disk. The number of impellers depends on the number of pump stages. Shaft parts are fixed to the shaft by keys and nuts to form a unit;

3. The entire rotor is supported by ball or sliding bearings at both ends. Bearings vary by model and do not support axial force, which is balanced by the balance disk. A balance disk wear indicator is installed at the pump end to monitor its wear;

4. Sealing surfaces between the inlet, middle, and outlet sections of the pump are sealed with adhesive or O-rings. The rotor part and fixed part are sealed with sealing rings and guide sleeves. When wear of these rings affects pump performance, they should be replaced timely;

5. The shaft can be sealed by mechanical seal or packing seal. When using packing seal, the placement of the packing ring must be correct and tension appropriate to allow liquid to leak drop by drop. Sealing elements are installed in the sealing chamber, which must have adequate water pressure to function as water seal, water cooling, or water lubrication.

6. During operation, the rotor is allowed to move axially within the pump casing. The horizontal multistage pump type D generally uses roller bearings and a dry oil lubrication structure (DVDG85-67, D/DG155-67 type pumps can use sliding bearings with light oil lubrication, or also roller bearings with dry lubrication).

7. The horizontal multistage pump type D is directly driven by the motor through an elastic coupling. From the motor direction, the pump rotates clockwise. The conventional motor is from the Y3 series, and in environments with flammable and explosive gases, the explosion-proof motor from the YB3 series is used.

8. If you have special requirements regarding the materials and structure of the horizontal multistage pump type D, you can consult with our company. Our professional technical staff can customize the passage material, configuration, and pump inlet and outlet direction according to your needs, ensuring your working conditions are met.

Precautions for the use of the horizontal multistage pump type D

The multistage pump must operate under design conditions. If the lift height during operation exceeds the specified range for a prolonged time, it will affect the safety of the entire piping system and will not be economical. If the lift height is below the specified range, that is, the multistage pump is used under high flow and low head conditions, especially for multistage pumps with low rotational speed, the shaft power will increase rapidly, causing motor overload and possible damage. When the flow increases, the maximum allowable suction height for the pump decreases, which can cause cavitation, significantly affecting pump performance and reducing economic efficiency. Therefore, when using the multistage pump, the lift height should not be lower than the specified operating conditions.

Product Parameters

Description of the D-type Horizontal Multistage Pump Model

Performance parameters of the D-type horizontal multistage pump (These data are for reference only, please take the actual order as the standard!)

D/DG/DF/MD6-25	D/DG/DF/MD6-50	D/DG/DF/MD6-80	D/DG/DF/MD12-25
D/DG/DF/MD12-50	D/DG/DF/MD12-80	D/DG/DF/MD25-30	D/DG/DF/MD25-50
D/DG/DF/MD25-80	D/DG/DF/MD46-30	D/DG/DF/MD46-50	D/DG/DF/MD46-80
D/DG/DF/MD85-45	D/DG/DF/MD85-67	D/DG/DF/MD85-80	D/DG/DF/MD85-100
D/DG/DF/MD120-50	D/DG/DF/MD120-100	D/DG/DF/MD150-30	D/DG/DF/MD150-50
D/DG/DF/MD150-80	D/DG/DF/MD150-100	D/DG/DF/MD155-30	D/DG/DF/MD155-67
D/DG/DF/MD200-50	D/DG/DF/MD200-100	D/DG/DF/MD200-150	D/DG/DF/MD210-70
D/DG/DF/MD280-43	D/DG/DF/MD280-65	D/DG/DF/MD280-95	D/DG/DF/MD280-100
D/DG/DF/MD300-45	D/DG/DF/MD360-40	D/DG/DF/MD360-60	D/DG/DF/MD360-95
D/DG/DF/MD450-60	D/DG/DF/MD450-95	D/DG/DF/MD500-57	D/DG/DF/MD550-50
D/DG/DF/MD580-60	D/DG/DF/MD640-80	D/DG/DF/MD720-60	D/DG/DF/MD1100-85

For more performance parameters of the D-type horizontal multistage pump, please download the intelligent selection software on the pump selection page or call: 0731-88192288 for more information.

Why Choose Us?

Changsha Zhonglian Pump Industry Co., Ltd. was established in 1989, following the reform of the Changsha Water Pump Factory. It is a national high-tech comprehensive enterprise integrating design, research and development, manufacturing, and service. The company was listed on the Hunan Provincial Stock Exchange on December 31, 2019, with the abbreviated name "Zhonglian Pump Industry" and stock code: 600275HN. It is currently a key enterprise in China's centrifugal pump industry and one of the leading domestic manufacturers of multi-stage pumps, headquartered in Changsha, Hunan, a historical and cultural city in China.

FAQ

What products do you mainly produce?

Zoomlion Pump Industry manufactures various large industrial centrifugal pumps. The main products include: self-balancing multistage pumps, multistage centrifugal pumps, single-stage centrifugal pumps, split-case pumps, chemical pumps, submersible pumps, pipeline pumps, long-shaft pumps, condenser pumps, and more.

Can you help me choose a model?

Of course! If the water pump model is not selected accurately, it can cause significant problems. After you take it back, it might be either too small to meet the usage requirements or too large, resulting in higher electricity and fuel costs, increasing the operating expenses.

Why is the price quotation so slow?

Because centrifugal pumps are non-standard custom products with many models and a wide price range. Even for the same model, the price varies greatly depending on the materials and configurations used. Taking the most common pump accessory—the impeller—as an example, the price of a stainless steel impeller is several times that of a cast iron impeller. Therefore, we need to clearly confirm the relevant information to provide you with an accurate price. Normally, if you provide comprehensive information, we can quote within 5 minutes.

What information should I provide when I need a quote?

Usually, if you want to get an accurate quote, it is recommended that you provide us with the following information: pump flow rate, head, on-site operating voltage, frequency, temperature of the conveyed liquid, pH value, solid particle content, on-site installation conditions (horizontal or vertical installation), and other related details. If you are not very familiar with these, it’s okay; our sales manager will assist you in determining them.

Do you have centrifugal pumps in stock?

There are many models and configurations of centrifugal pumps. Except for a small number of commonly used standard models that are in stock, the vast majority of models and configurations are not stocked and are customized products. We need to first select the pump based on your site conditions such as flow rate, head, medium temperature, pH value, and installation conditions. After determining the pump model and configuration, we can then place an order with the workshop for production.

What is your usual delivery time?

Models in stock can be shipped by the next day at the latest. Others are custom-made, and depending on the product size and specific project conditions, the delivery time is generally between 7-90 days. Please consult our sales manager for details: 0731-88632200 。