Durable Cast Iron Multistage Boiler Feed Pump for High Pressure 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

Introducing the SHD and SHDG single-suction multistage segmental type centrifugal pumps, designed for impeccable performance in conveying water or fluids with physical and chemical traits similar to water, free from solid particles. The SHD pump is engineered to handle fluids with temperatures up to 80 ºC, making it perfect for applications in mines, factories, and urban drainage systems. On the other hand, the SHDG model is tailored for higher temperature demands, managing fluids up to 105 ºC, making it an ideal choice for boiler feed applications, hot water delivery, and other high-temperature scenarios.

Structural Features
The SHD and SHDG pumps are masterfully constructed from a stator, rotor, bearings, and shaft seal, ensuring robust and reliable performance.
1, Stator Part: This crucial component consists of sections such as inhalation, middle, discharge, and guide vanes, all securely fastened with tension bolts to facilitate smooth operation. The SHD-type pump features a horizontal inlet and vertical outlet, while the SHDG type boasts both vertical inlet and outlet configurations for versatile installation.
2, Rotor Parts: Comprising the shaft, impeller, balance plate, and bushings, these components work in harmony to ensure seamless operation. The shaft efficiently transfers power to the impeller, enabling it to function optimally. Axial force is expertly countered by the balance plate, while both ends of the shaft are protected by replaceable shaft sleeves.
3, Bearing Part: The pump incorporates two types of bearings—rolling and sliding bearings—for enhanced durability and efficiency.
The sliding bearing assembly includes the bearing body, caps, dust disk, oil level gauge, rejection mooring rings, and other integral parts, all lubricated with thick oil. Meanwhile, the rolling bearing consists of the main body, bearings, and gland, utilizing grease as lubricant for smooth operation.
4, Shaft Seal Parts: The sophisticated design features either mechanical or packing seals, consisting of water segments, sealed body filler, and retaining ring components at the tail cover letter. These seals are crucial for water sealing, cooling, and lubrication. For SHD pumps, the seal water is sourced from the pressure water within the pump, whereas the SHDG pumps draw from external cooling water at normal temperatures. Optimal seal performance requires seal water pressure to exceed that of the seal chamber by 0.05-0.1MPa, while cooling water pressure should range between 0.15-0.3MPa.

Additionally, the pump is powered directly by a prime motor through a flexible coupling, facilitating a seamless clockwise rotation as viewed from the prime motor end.

The SHD and SHDG single-suction multistage segmental type centrifugal booster pumps can be effectively driven by either an electric motor or a diesel engine, offering versatile power solutions for diverse industrial needs.

Detailed Photos

In the realm of multistage centrifugal pumps, the immense thrust generated by the impellers, all aligned in the same direction, necessitates the incorporation of a thrust balance device, such as a balance disc or balance drum. This ingenious device effectively reduces the thrust to manageable levels, allowing a standard-sized thrust bearing to handle it with ease.
The impeller can be crafted from a variety of high-grade materials, including cast iron, cast steel, stainless steel, and bronze, each selected for its durability and performance under various conditions.

Adaptable Couplings
In contrast to rigid couplings, flexible couplings possess the distinct advantage of accommodating movement, such as vibrations and thermal expansion, without sustaining damage. This unique capability makes them the ideal choice for applications where there might be slight misalignments between the drive and pump shafts. Not only do they adeptly absorb vibrations, reducing excessive noise, but they also offer a more complex and costly design. However, the long-term benefits, including protection of the shaft and bearings from damage and premature wear, result in significant maintenance savings over time.
Our selection includes wear-resisting disc coupling and pin coupling, which are chosen for their durability and performance.

Packing seals have been a staple in sealing solutions for countless years. These seals utilize rope-like materials that encircle the pump shaft, effectively filling dead space and curbing fluid loss. However, as time progresses, the gland packing material may degrade, leading to increased fluid loss and potentially hindering regular lubrication or ease-of-replacement essential for optimal function.

Mechanical seals are the superior choice over traditional packing seals in a wide array of applications, particularly where leakage prevention is paramount. These seals are engineered to be more robust and are capable of withstanding substantial wear. By incorporating multiple sealing points, basic mechanical seals drastically minimize any potential leakage issues, offering a more reliable and enduring sealing 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

These remarkable pumps are a staple in pressure boosting systems, delivering unwavering flow and consistent pressure in demanding conditions. They are the go-to solution for a variety of high-stakes projects, including:
Mine dewatering solutions
High-density residential areas
Efficient snow-making processes
Reliable boiler feed systems
Sophisticated Reverse Osmosis systems
A wide array of industrial applications
Condensate handling and management
Intensive high-pressure cleaning and wash-down facilities
Essential jacking pumps for fire hydrant systems
Strategic irrigation and fire hose supply systems
Enhanced shower experiences
Cutting-edge co-generation systems
Efficient spray operations
Top-tier pressure boosting installations

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.