Durable High Pressure Multistage Pump for Centrifugal Water Applications

• 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 models, our single-suction multistage segmental type centrifugal pumps are designed to efficiently convey water or fluids with similar physical and chemical properties, all while excluding solid particles. The SHD pump is ideal for applications where fluid temperatures do not exceed 80 ºC, making it perfect for mines, factories, and urban drainage systems. Meanwhile, the SHDG pump handles fluids with temperatures up to 105 ºC, making it excellently suited for use as a boiler feed pump or in the delivery of hot water and similar high-temperature applications.

Structural features
The SHD and SHDG pumps are expertly crafted with a robust structure composed of a stator, rotor, bearings, and shaft seal, ensuring longevity and reliability.
1, Stator part: This component includes sections such as the suction, middle, and discharge sections, along with guide vanes. These parts are securely clamped together using tension bolts to form the operational portion of the pump. The SHD model features a horizontal inlet and a vertical outlet, whereas the SHDG model provides both inlets and outlets in vertical arrangements.
2, Rotor parts: Comprising elements such as the shaft, impeller, balance plate, and bushings, these parts are integral to the pump's performance. The shaft serves as the powerhouse, transferring energy to the impeller. Axial forces are adeptly counterbalanced by the balance plate, and the extremities of the shaft are protected with replaceable sleeves.
3, Bearing part: This includes two types of bearings – rolling and sliding.
Sliding bearings are constructed with components like the bearing body, caps, bearings, dust disk, oil level gauge, and rejection mooring rings, all lubricated by thick oil. Meanwhile, rolling bearings feature a main body, bearings, and a gland, utilizing grease for lubrication.
4, Shaft seal parts: Options of mechanical seals or packing seals are available, comprising a water segment, sealed body filler, and retaining rings at the tail cover. The seal chamber fluid offers water sealing, cooling, and lubrication functions. For SHD pumps, the seal is sourced from pressure water inside the pump. In contrast, the SHDG model uses external cooling water or normal temperature water. The seal water pressure should surpass the seal chamber pressure by 0.05-0.1MPa, while cooling water pressure is maintained between 0.15-0.3MPa.

Additionally, these pumps are driven by a prime motor via a flexible coupling, ensuring seamless operation. They rotate clockwise when viewed from the prime motor end, emphasizing their suitability for various installations.

Our SHD and SHDG pumps, as centrifugal booster pumps, offer the flexibility of being driven by either an electric motor or a diesel engine, adapting to your specific energy requirements.

Detailed Photos

In the realm of multistage centrifugal pumps, a significant amount of thrust is generated due to all impellers being oriented in the same direction. To manage this, a thrust balance device, such as a balance disc or balance drum, is utilized. This ingenious mechanism adeptly reduces the thrust to a level manageable by a standard-sized thrust bearing, ensuring optimal performance and longevity.
Our impellers are crafted with precision, available in a variety of robust materials such as cast iron, cast steel, stainless steel, and bronze, each selected for their unmatched strength and durability.

Flexible couplings
Flexible couplings stand out from rigid couplings by their ability to accommodate slight movements like vibrations and thermal expansions without sustaining damage. These features make them perfect for scenarios with some degree of unavoidable misalignment between the drive and pump shafts. Not only do they absorb vibrations effectively, thereby reducing excessive noise, but their sophisticated design also brings long-term maintenance savings by protecting the shaft and bearing from damage and premature wear. While they may come with a more complex and expensive design, the benefits they offer far outweigh the initial investment.
Our state-of-the-art wear-resisting disc coupling or pin coupling solutions offer enhanced durability and performance.

Packing seals have historically been the go-to sealing solution, renowned for their simplicity and effectiveness. These seals utilize rope-like materials that wrap around the pump shaft, filling dead spaces to minimize fluid loss. However, as time progresses, the gland packing material begins to wear down, potentially increasing fluid loss and affecting regular lubrication, which may impair ease-of-replacement and overall functionality.

For applications where leakage is particularly undesirable, mechanical seals are the preferred choice over traditional packing seals. They offer superior durability and resilience, specifically engineered to handle more rigorous conditions. The basic mechanical seals employ multiple sealing points, effectively curtailing any leakage issues, providing peace of mind with their advanced technology.

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 durable high-pressure multistage pumps are an essential component in pressure boosting systems, expertly designed to maintain constant flow and pressure in the most demanding environments. These pumps are perfectly suited for a wide range of horizontal multistage pump applications, including:
Mine dewatering - Efficiently manage water levels to ensure safety and operational efficiency in mining operations.
High density living - Seamlessly support water supply needs for residential complexes and skyscrapers.
Snow making - Provide the power needed for snow production systems in ski resorts or recreational areas.
Boiler feed systems - Ensure reliable water supply to boilers for smooth and uninterrupted operations.
Reverse Osmosis - Deliver precise pressure for effective water purification and filtration processes.
Industrial applications - Versatile solution for a variety of industrial processes requiring robust water pumping.
Condensate - Efficiently handle condensate return in heating and cooling systems.
High pressure cleaning/wash down facilities - Power through tough cleaning tasks with ease and efficiency.
Jacking pumps for fire hydrant systems - Critical for maintaining fire safety standards and readiness.
Irrigation and fire hose feel supply - Ensure ample water delivery for agricultural irrigation and emergency fire situations.
Showers - Provide consistent water pressure for a refreshing and invigorating shower experience.
Co generation - Support energy-efficient systems that produce both electricity and heat from a single fuel source.
Spray - Deliver precise and controlled water spraying in various applications.
Pressure Boosting - Enhance water pressure in areas where it is insufficient, ensuring optimal performance.

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.