Versatile High Lift Pump for Electric Boiler Feed and Water Boosting

• 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

Introducing the SHD and SHDG single-suction, multistage segmental type centrifugal pumps—a cutting-edge solution for efficiently conveying water or fluids with similar physical and chemical properties, free from solid particles. The SHD model is engineered to handle fluids at temperatures below 80 ºC, making it an ideal choice for applications in mines, factories, and urban drainage systems. On the other hand, the SHDG model is designed to manage fluids at temperatures up to 105 ºC, perfectly suited for boiler feed applications and the delivery of hot water in various advanced scenarios.

Structural Features
The SHD and SHDG pumps are meticulously crafted, comprising of a stator, rotor, bearings, and a robust shaft seal, ensuring high performance and reliability.
1, Stator Part: The stator is ingeniously assembled with components such as the inhalation and middle sections, spit section, and guide vanes, all securely clamped by tension bolts to form the operational heart of the pump. The SHD pumps feature a horizontal inlet and vertical outlet design, while the SHDG pumps are equipped with both vertical inlet and outlet, optimizing fluid dynamics for each application.
2, Rotor Parts: The rotor is an integral assembly of the shaft, impeller, balance plate, bushings, and other critical components. The shaft is pivotal in transferring power to the impeller for peak operational efficiency. The axial force is expertly balanced by the balance plate, and both ends of the shaft are fortified with interchangeable shaft sleeves for enhanced durability and longevity.
3, Bearing Part: Equipped with two types of bearings—rolling and sliding bearings—our pumps ensure smooth operation and minimal maintenance.
The sliding bearing system, comprising the bearing body, caps, dust disk, oil level gauge, and rejection mooring rings, utilizes thick oil for superior lubrication. The rolling bearing assembly, consisting of the main body, bearings, and gland, is designed for optimum performance with grease lubrication.
4, Shaft Seal Parts: Our pumps employ either a mechanical or packing seal system, featuring water segment, sealed body filler, and retaining ring components at the tail cover. The seal chamber liquid provides water sealing, cooling, and lubrication functions. The SHD pump sources its seal water internally from the pressure water inside the pump, whereas the SHDG pump draws cooling water externally, using normal temperature water. The seal water pressure is precisely maintained at 0.05-0.1MPa above the seal chamber pressure, while the cooling water pressure is regulated between 0.15-0.3MPa to ensure flawless operation.

Additionally, the pump is directly coupled to a prime motor using a flexible coupling, and operates with a clockwise rotation when viewed from the prime motor end, ensuring seamless power transfer and operational efficiency.

The SHD and SHDG single-suction, multistage segmental type centrifugal booster pumps offer versatile power options, capable of being driven by either an electric motor or a diesel engine, catering to varied operational requirements and preferences.

Detailed Photos

In the world of multistage centrifugal pumps, a significant challenge arises due to the high thrust generated when impellers align in the same direction. To elegantly address this, a thrust balance device such as a balance disc or balance drum is ingeniously utilized. This sophisticated mechanism skillfully reduces the overwhelming thrust to a manageable level, perfectly suited for a standard-sized thrust bearing, ensuring optimal performance and longevity.
The impellers in our state-of-the-art pumps are crafted from a selection of premium materials, including cast iron, cast steel, stainless steel, and bronze, each chosen for its unique resilience and performance-enhancing properties.

Flexible Couplings
Offering a superior alternative to rigid couplings, flexible couplings are designed to adeptly accommodate movement such as vibrations and thermal expansion, all without incurring damage. This makes them the perfect choice for applications with unavoidable misalignment between drive and pump shafts. Their remarkable ability to absorb vibrations not only reduces excessive operational noise but also provides significant maintenance savings over time. While their design is more complex and comes at a higher initial cost, the long-term benefits of protecting shafts and bearings from damage and premature wear are invaluable.
Our innovative approach utilizes wear-resisting disc couplings or pin couplings, crafted for durability and efficiency.

Packing seals have long been the cornerstone of sealing solutions. These traditional seals work by using rope-like materials to effectively wrap around the pump's shaft, filling voids and minimizing fluid loss. However, as time progresses, these materials may wear down, leading to increased fluid loss. This process can potentially impede regular lubrication and complicate ease-of-replacement, both of which are crucial for maintaining optimal functionality.

When it comes to preventing leakage, mechanical seals are the modern solution of choice, favored over traditional packing seals for their robust design and enhanced durability. These advanced seals are engineered for resilience, adept at handling significant demands, and feature multiple sealing points to virtually eliminate leakage issues, proving to be the superior option across various demanding applications.

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 pressure boosting systems are at the heart of numerous industrial and commercial operations. These advanced systems are indispensable in scenarios that require a seamless, continuous flow and unwavering pressure. Leading the way in efficiency, horizontal multistage pumps are the choice for projects like:
Mine dewatering
High density living
Snow making
Boiler feed systems
Reverse Osmosis
Industrial applications
Condensate
High pressure cleaning and wash down facilities
Jacking pumps for fire hydrant systems
Irrigation and fire hose feel supply
Showers
Co-generation
Spray
Pressure Boosting

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.