Reliable Electric Centrifugal Pump for Mining and Boiler Feed Services

• 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, meticulously engineered to convey water or fluids with similar physical and chemical properties, free from solid particles. The SHD model efficiently handles fluids at temperatures below 80 ºC, making it an ideal choice for mining operations, industrial facilities, and urban drainage systems. Meanwhile, the SHDG model is expertly designed to manage fluid temperatures up to 105 ºC, perfectly suited for boiler feed applications and the delivery of hot water in various industrial scenarios.

Structural Features
The SHD and SHDG pumps boast a robust construction comprising a stator, rotor, bearings, and a sophisticated shaft seal system.
1, Stator Part: Comprising mainly the suction, middle, and discharge sections, along with expertly designed guide vanes. These segments are securely clamped with tension bolts to support the pump's dynamic operations. The SHD-type pump features a horizontal inlet and a vertical outlet, while the SHDG type offers both vertical inlet and outlet configurations, catering to diverse installation needs.
2, Rotor Parts: Central to the pump's operation are the shaft, impeller, balance plate, and bushings, expertly designed for optimum performance. The shaft transmits power to the impeller, ensuring efficient fluid movement. Axial forces are harmoniously balanced by the balance plate, while replaceable shaft sleeves at both ends provide enhanced durability and protection.
3, Bearing Part: The pump incorporates two types of advanced bearings: rolling bearings and sliding bearings:
Sliding Bearings: Composed of a bearing body, caps, dust disk, oil level gauge, rejection mooring rings, and more, lubricated with thick oil for smooth functionality. Rolling Bearings: Featuring a main body, bearings, and gland, these are expertly lubricated using grease, ensuring seamless operation and longevity.
4, Shaft Seal Parts: The pump offers flexibility with mechanical or packing seal options, crafted from water segments, sealed body filler, and retaining ring components at the tail cover. The seal chamber liquid ensures effective water sealing, cooling, and lubrication. The SHD model sources seal water from the pump's internal pressure, while the SHDG model utilizes external cooling water. The seal water pressure should be 0.05-0.1MPa above the chamber, with cooling water pressure maintained at 0.15-0.3MPa for optimal performance.

Additionally, these pumps are driven directly by a prime motor via a flexible coupling, ensuring smooth operation. They rotate clockwise as viewed from the prime motor end, delivering consistent and reliable performance.

The versatile SHD and SHDG single-suction multistage segmental type centrifugal booster pumps offer the flexibility to be powered either by an electric motor or a diesel engine, catering to diverse operational requirements and ensuring dependable performance across various scenarios.

Detailed Photos

In the realm of multistage centrifugal pumps, a significant thrust is generated as the impellers align uniformly in a single direction. To manage this, an ingenious thrust balance device, such as a balance disc or balance drum, is employed. This device expertly reduces the thrust to manageable levels suitable for a standard-sized thrust bearing, ensuring optimal functioning of the pump.
Our impellers are crafted using a selection of robust materials, including cast iron, cast steel, stainless steel, and bronze, providing durability and reliability tailored to specific needs.

Flexible couplings
Unlike their rigid counterparts, flexible couplings are designed to accommodate slight movements such as vibrations and thermal expansion without incurring damage. This makes them ideally suited for applications with unavoidable misalignment between drive and pump shafts. Known for their superior ability to absorb vibrations, they also contribute to a reduction in excessive operational noise. While the design is more intricate and costly, the long-term maintenance savings they offer by protecting shafts and bearings from damage and premature wear are undeniable.
Our selection includes high-performance wear-resisting disc couplings or pin couplings, ensuring reliable connectivity and efficiency.

Packing seals have long been a staple in sealing solutions, utilizing rope-like materials to encircle the pump shaft, effectively filling dead spaces and minimizing fluid loss. However, as time progresses, the gland packing material may wear down, increasing fluid loss and potentially impairing necessary lubrication or ease of replacement.

For applications where leakage prevention is paramount, mechanical seals are the preferred choice over traditional packing seals. Renowned for their enhanced durability, these seals are engineered to withstand significant wear and tear. Basic mechanical seals employ multiple sealing points, effectively minimizing leakage concerns.

Product Parameters

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

Product Application

Pressure boosting systems frequently incorporate these robust pumps, well-suited for scenarios that necessitate an unwavering flow and consistent pressure. Among the most prevalent projects that benefit from the deployment of a horizontal multistage pump are:
Mine dewatering - crucial for maintaining operational efficiency and safety in mining operations.
High density living - ensures reliable water supply and management in densely populated residential areas.
Snow making - vital for creating artificial snow, especially in ski resorts and recreational areas.
Boiler feed systems - these pumps are pivotal in maintaining the optimal functioning of boiler operations.
Reverse Osmosis - essential in water purification processes, delivering the necessary pressure for effective filtration.
Industrial applications - adaptable and powerful for a variety of industrial uses where fluid management is critical.
Condensate - effectively handles the recovery of condensed water vapor in various systems.
High pressure cleaning/wash down facilities - ideal for delivering the force needed in cleaning operations.
Jacking pumps for fire hydrant systems - vital for ensuring readiness and reliability of fire suppression systems.
Irrigation and fire hose reel supply - provides the necessary flow and pressure to support irrigation and firefighting efforts.
Showers - ensures a consistent and pleasant water flow for optimal shower experiences.
Co generation - supports combined heat and power systems for enhanced energy efficiency.
Spray - facilitates various spraying applications with precision and control over pressure.
Pressure Boosting - elevates water pressure to meet specific system demands efficiently.

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.