Reliable Multistage Electric Pump for High Performance Mining Needs

• Customization: Available
• After-sales Service: Online After-Sale Service
• Warranty: 12 Months
• Model NO.: SHDG85-45/8
• Max.Head: >150m
• Max.Capacity: >400 L/min
• Driving Type: Motor
• Impeller Number: Multistage Pump
• Working Pressure: High Pressure Pump
• Influent Type of Impeller: Single Suction Pump
• Position of Pump Shaft: Horizontal Pump
• Pump Casing Combined: Verticaljoint Surface Pump
• Mounting Height: Suction Centrifugal
• Impeller: Closed
• Usage: Pump, Pumps, Condensate Pump, Circulating Pump
• Material: Cast Iron, Cast Steel, Stainless Steel, Bronze
• Seal Type: Mechanical Sea or Packing Gland Seal
• Coupling: Flexible Pins/Disc
• Driver: Electric Motor/Diesel Engine
• Transport Package: Plywood Case
• Specification: 2200*900*1500mm
• Trademark: SEMHAI or OEM
• Origin: China
• HS Code: 8413709990
• Production Capacity: 1000000sets/Year

Product Description

Product Description

The SHD and SHDG series single-suction multistage segmental type centrifugal pumps are expertly engineered for the efficient conveyance of water and fluids with physical and chemical properties akin to water, free from solid particles. These robust SHD pumps are designed to handle transmission fluids up to a temperature of 80 ºC, making them the perfect choice for applications in mines, industrial factories, and urban drainage systems. Meanwhile, the SHDG pumps cater to more intense demands, handling fluids up to 105 ºC, ideally suited for use as boiler feed pumps or in the delivery of hot water and similar high-temperature scenarios.

Structural Features
The SHD and SHDG pumps boast a sophisticated structure, composed of four primary components: the stator, rotor, bearings, and shaft seal. Each element is meticulously crafted to ensure optimal performance and durability.
1. Stator Part: Ingeniously designed, this section includes major components such as the suction, middle, and discharge sections, along with guide vanes, all expertly clamped together with tension bolts to form the operational segment. The SHD-type pump features a horizontal inlet and vertical outlet, whereas the SHDG type is equipped with both vertical inlet and outlet for versatile installation.
2. Rotor Parts: This integral part comprises the shaft, impeller, balance plate, and protective bushings, working in harmony to deliver power to the impeller, ensuring efficient operation. The axial force is skillfully balanced by the balance plate, with both ends of the shaft featuring replaceable shaft sleeves for enhanced protection and longevity.
3. Bearing Part: Incorporating two types of bearings, rolling and sliding, to suit diverse operational requirements:
Sliding bearing assemblies consist of the bearing body, caps, dust disk, oil level gauge, and rejection mooring rings, all lubricated with thick oil for smooth functioning. The rolling bearing setup includes the main body, bearings, and gland, utilizing grease lubrication to maintain optimal performance.
4. Shaft Seal Parts: Equipped with advanced mechanical or packing seals, comprising water segments and sealed body fillers with retaining ring components at the tail cover letter. The seal chamber is designed to utilize liquid for water sealing, cooling, and lubrication purposes. For SHD pumps, the seal water originates from the pump's internal pressure, while SHDG pumps draw from external cooling or normal temperature water sources. Seal water pressure must exceed the seal chamber by 0.05-0.1MPa, while cooling water requires a pressure of 0.15-0.3MPa for efficient operation.

Moreover, the pump operates with a direct prime motor drive through a flexible coupling, ensuring seamless and reliable clockwise rotation when viewed from the prime motor's end.

The SHD and SHDG pumps, renowned for their versatility, can be powered by either an electric motor or a diesel engine, providing adaptability across varying operational environments and power sources.

Detailed Photos

In the realm of multistage centrifugal pumps, an intriguing phenomenon occurs due to the uniform direction of the impellers—this results in substantial thrust generation. To elegantly manage this, a specialized thrust balance device, such as a balance disc or balance drum, is ingeniously implemented. This sophisticated mechanism adeptly minimizes the thrust to a manageable level, allowing it to be easily accommodated by a standard-sized thrust bearing, ensuring seamless and efficient operation.
The impeller material options are diverse and robust, including the durability of cast iron, the strength of cast steel, the resilience of stainless steel, and the classic reliability of bronze.

Adaptable Couplings
In contrast to their rigid counterparts, flexible couplings boast the capability to accommodate various movements, such as vibrations and thermal expansion, without sustaining damage. This adaptability makes them ideal for applications where unavoidable misalignment between the drive and pump shafts may occur. Their superior ability to absorb vibrations not only protects the equipment but also significantly reduces operating noise levels. While these benefits entail a more intricate and costly design, the long-term advantages include substantial maintenance savings, as flexible couplings effectively shield the shaft and bearings from damage and premature wear.
Our choice includes wear-resisting disc couplings or pin couplings, tailored to enhance durability and performance.

Packing seals have stood the test of time as a widely used sealing solution, utilizing rope-like materials that encase the pump shaft. This design fills dead space and minimizes fluid loss. However, over time, wear can lead to increased fluid loss, potentially impairing lubrication efficiency and ease of replacement, essential for optimal function.

Mechanical seals have become the preferred choice over traditional packing seals, especially in applications where leakage must be avoided. These advanced seals are engineered for greater durability, with the ability to withstand significant operational demands. They employ multiple sealing points to virtually eliminate leakage issues, offering a reliable and efficient solution.

Product Parameters

Flow rate	6-1000m3/hr
Head rate	25-650m
Speed	1450-2900rpm
Medium temperature	0-105 ºC
Diameter	40-350mm

Product Application

Our state-of-the-art pumps are the heartbeat of pressure boosting systems, ensuring a seamless supply of consistent flow and pressure. These versatile pumps are essential in various demanding scenarios. Here are some of the most prevalent projects that harness the power of our horizontal multistage pumps:
Mine dewatering: Efficiently manage water levels in mining operations.
High density living: Delivering reliable water supply in urban residential complexes.
Snow making: Perfect for creating artificial snow in ski resorts with precision.
Boiler feed systems: Ensure optimum performance of boilers with steady water supply.
Reverse Osmosis: Critical in water purification systems for quality assurance.
Industrial applications: Engineered for diverse heavy-duty industrial processes.
Condensate: Handle condensate with ease in various systems.
High pressure cleaning/wash down facilities: Deliver exceptional cleaning power for demanding environments.
Jacking pumps for fire hydrant systems: Vital for maintaining optimal fire safety standards.
Irrigation and fire hose feel supply: Essential for effective irrigation and emergency services support.
Showers: Enhance the shower experience with consistent water pressure.
Co generation: Integral in energy-efficient cogeneration systems.
Spray: Ideal for a variety of spray applications where precision is key.
Pressure Boosting: Unmatched in providing reliable pressure boosting solutions for various applications.

Facilities & Equipments

FAQ

A. What are the multi stage pump parts?
The multistage pump parts are very similar to those of the standard Centrifugal pump except for the Multistage Centrifugal pump where the additional parts are diffusers which efficiently channel the fluid into the eye of the impeller or to the following stage. In the side channel pump, there are intermediate plates with the scalloped side channel and liquid parts.
In multistage centrifugal pumps, because of the high thrust that is generated due to the impellers facing in the same direction, there will be a thrust balance device i.e balance disc or balance drum which reduces the thrust to a level which can be managed by a standard sized thrust bearing.

B. How does a multi stage pump work?
A multistage pump operates by one impeller feeding into the next impeller and the number of impellers required depend on the discharge pressure requirement. Liquid enters the pump and then passes through the various number of impellers in a sequence from the left to right.

C. What are the applications and uses for multi stage pumps?
The applications for multi stage pumps are many and varied and can be used for delivering water to high rise buildings, reverse osmosis (RO), boiler feed water, spraying, high pressure cleaning, water works, heating, condensate, fuel delivery, oil and gas production, power generation & mining and other high pressure and temperature applications..

D. What are the different types of multi stage pumps?
Types of multistage pumps include;
Horizontal Multistage Centrifugal pump (above ground)
Vertical Multistage Centrifugal pump (above ground)
Submersible/Sump pump types
Side Channel pump
Combination pumps i.e Centrifugal low NPSH first stage with side channel additional stage.
Horizontal split case pump
Vertical Turbine pump
Sanitary Multistage pump

E. What are the advantages of using a multi stage pump?
If we were to compare the Centrifugal multi stage pump to a high pressure duty pump - the Centrifugal multi stage pump even though it is more complex and costly, it would probably be a better hydraulic fit, have a better efficiency and be more reliable. With its hydraulic modules, the ability to supply additional impellers and its ability to trim those impellers, the duty point can me met exactly without compromise. The selection is more likely to be close to 'BEP' and will run efficiently and reliably.
Multi stage pumps can be configured to have an interstage bleed off if there are multiple duty points required. It may be possible to run a multistage pump at a lower speed than a single stage centrifugal pump which may offer an efficiency advantage but it will certainly run much quieter which is an important consideration in today's world. A 3 dBA increase represents a doubling of sound as the sound scale is logarithmic.

F. What is difference between a single stage and a multi stage pump?
A single stage pump uses one impeller whereas a multi stage pump uses 2 or more impellers (some manufacturers use 80 or more impellers).
There are additional components in a multi stage pump which are required for channelling the fluid from the first stage to the following stage i.e diffusers.
Multi stage pumps have a thrust balance device and there may also be intermediate bearings (lubricated by the pumpage) to steady the shaft plus other minor differences.

G. How do you read a multistage pump curve?
You read a multi stage pump curve in exactly the same way as you read any other pump type curve however some manufacturers will publish single stage curves which means that this has to be multiplied out to establish the number of stages required, however be aware that the side channel pumps have their maximum power at zero flow and the power decreases with increasing flow which is the reverse of a centrifugal pump.

H. What is the difference between a vertical multistage pump and a horizontal multistage pump?
The main differences between a vertical multi stage pump and a horizontal multi stage pump are;
1.The orientation of the pump
2.The vertical multi stage pump is above ground and may be used where there are space limitations however the motor needs to be removed before maintenance can be performed.
3.Vertical multi stage pumps are used in some applications where the motor needs to be lifted from the sump so that the unit can be maintained. It is common in vertical pumps for the thrust load to be taken by the motor e.g. VTP turbine pumps which have electric motors specifically designed for this type of pump to eliminate the need for a thrust bearing in the pump resulting in less complexity and costs. VTP pumps can be produced with column lengths of more than 100 metres.
4.Horizontal multi stage pumps are mounted using feet which for high temperature applications are a special design to allow for thermal growth and thus avoid operating issues due to expansion and contraction. They would need to be aligned with the electric motor. On vertical pumps, the mounting is perhaps simpler i.e for sump pumps, a support plate would be fixed with standard bolting and generally no alignment is required as the motor is flanged and it is self aligning with the corresponding register.

I. Which type of multistage pump is more commonly used in industry?
The most common type of multi stage pump used in Industry is the horizontal multi stage pump and vertical multi stage pump (above ground) mounted centrifugal pumps. However, multi stage side channel pumps would also be relatively common along with the vertical turbine pumps.

SEMHAI can offer a full range of Flowserve's Multi stage pumps.We provide localised technical support & on-site service engineering to support your operational needs.