Versatile Stainless Steel Multistage Pump for High Pressure 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 single-suction multistage segmental type centrifugal pumps—engineering marvels designed to convey water or similar fluids devoid of solid particles. The SHD pumps are meticulously crafted to handle fluids at temperatures below 80 ºC, making them ideal for mines, factories, and urban drainage systems. Meanwhile, the SHDG pumps excel at transmitting fluids up to 105 ºC, perfect for applications such as boiler feed pumps or the delivery of hot water and similar scenarios.

Structural Features
The SHD and SHDG type pumps boast a robust construction comprising a stator, rotor, bearings, and a sophisticated shaft seal system.
1. Stator Part: Precision-engineered to include components such as inhalation, middle, spit sections, and guide vanes, which are securely clamped with tension bolts. The SHD pump features a horizontal inlet and vertical outlet, whereas the SHDG pump is optimized with both vertical inlet and outlet orientations.
2. Rotor Parts: Composed of the shaft, impeller, balance plate, and bushings, these parts are integral to the pump's performance. The shaft efficiently transmits power to the impeller, enabling it to function. The axial force is expertly balanced by the balance plate, and both ends of the shaft are equipped with replaceable sleeves for enhanced protection.
3. Bearing Part: This section includes two types of bearings—rolling and sliding.
Sliding Bearings: Feature a bearing body, caps, bearings, dust disk, oil level gauge, and rejection mooring rings, all lubricated with thick oil. Rolling Bearings: Comprising the main body, bearings, and gland, these are lubricated with high-quality grease for optimal performance.
4. Shaft Seal Parts: Utilizing either mechanical or packing seals, these components are meticulously designed with a water segment and sealed body filler, including retaining ring components at the tail cover letter. The seal chamber liquid functions to provide water sealing, cooling, and lubrication. For the SHD pumps, seal water is sourced from the pump's internal pressure water, whereas SHDG pumps utilize cooling water from an external source. The seal water pressure is maintained at 0.05-0.1MPa above the seal chamber, and cooling water pressure is regulated between 0.15-0.3MPa.

Additionally, our pumps are seamlessly driven by a prime motor via a flexible coupling, ensuring clockwise rotation as viewed from the prime motor end.

The SHD and SHDG single-suction multistage segmental type centrifugal booster pumps offer versatile drive options, compatible with both electric motors and diesel engines.

Detailed Photos

In the realm of multistage centrifugal pumps, a significant amount of thrust is generated as the impellers all face the same direction. To manage this intense force, a sophisticated thrust balance device is incorporated, such as the balance disc or balance drum. These marvels of engineering effectively minimize the thrust, bringing it to a level that can be effortlessly handled by a standard-sized thrust bearing, ensuring reliability and longevity.
The impeller material options are versatile and include cast iron, cast steel, stainless steel, and bronze, offering a range of solutions tailored to different applications and environments.

Flexible Couplings
In contrast to their rigid counterparts, flexible couplings have the remarkable ability to accommodate movement, including vibrations and thermal expansion, without sustaining damage. This makes them ideal for scenarios where some misalignment between the drive and pump shafts is inevitable. Their superior vibration absorption also aids in significantly reducing operational noise. Although they boast a more intricate and costly design, flexible couplings provide substantial long-term maintenance savings. By shielding the shaft and bearings from damage and premature wear, they prove to be an invaluable asset.
We are committed to using wear-resisting disc coupling or pin coupling for enhanced durability and performance.

Packing seals have long been the cornerstone of sealing solutions, utilizing rope-like materials that envelop the pump shaft to fill dead space and curtail fluid loss. However, over time, as the gland packing material succumbs to wear, fluid loss may increase, potentially hindering regular lubrication and complicating replacement efforts necessary for optimal operation.

In applications where leakage is a critical concern, mechanical seals are favored over traditional packing seals. These robust seals are engineered to withstand more rigorous conditions, boasting multiple sealing points that virtually eliminate leakage issues, vastly surpassing their predecessors in terms of durability and effectiveness.

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 superior Versatile Stainless Steel Multistage Pump is an essential component of pressure boosting systems, expertly designed to ensure consistent flow and pressure under demanding conditions. Key projects utilizing this robust horizontal multistage pump include:
Efficient Mine Dewatering
High Density Living Solutions
Reliable Snow Making Systems
Boiler Feed Systems
Advanced Reverse Osmosis Processes
Comprehensive Industrial Applications
Effective Condensate Handling
High Pressure Cleaning and Wash Down Facilities
Jacking Pumps for Enhanced Fire Hydrant Systems
Irrigation and Fire Hose Feed Supply
Luxurious Showers
Co-generation Systems
Efficient Spraying Solutions
State-of-the-Art 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.