High Efficiency Horizontal Boiler Feed Pump for Centrifugal Water Systems

• 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 our SHD and SHDG series, single-suction, multistage, segmental type centrifugal pumps. These pumps are expertly designed to convey water or fluids with similar physical and chemical properties, devoid of solid particles. The SHD model efficiently transmits fluids with temperatures below 80ºC, making it ideal for applications in mines, factories, and urban drainage systems. Meanwhile, the SHDG model is engineered to handle fluids up to 105ºC, perfectly suited as a boiler feed pump or for the delivery of hot water and other high-temperature uses.

Structural Features
The SHD and SHDG series pumps are meticulously crafted from four critical components: the stator, rotor, bearings, and shaft seal, ensuring robust performance and durability.
1. Stator Components: This section is predominantly composed of the suction, middle, and discharge sections, along with guide vanes. These parts are firmly clamped together using tension bolts to ensure seamless operation. The SHD pump features a horizontal inlet with a vertical outlet, while the SHDG model boasts both vertical inlet and outlet configurations.
2. Rotor Components: At the heart of the rotor are the shaft, impeller, balance plate, bushings, and additional components. The shaft is responsible for transferring power to the impeller, enabling its operation. The impeller's axial force is deftly balanced by the balance plate. Both ends of the shaft are safeguarded with replaceable shaft sleeves.
3. Bearing Components: Our pumps utilize two types of bearings: rolling bearings and sliding bearings.
Sliding bearings consist of a bearing body, caps, the bearing itself, a dust disk, an oil level gauge, and rejection mooring rings, all lubricated with thick oil. Rolling bearings include the main body, bearings, and gland, utilizing grease for lubrication.
4. Shaft Seal Components: These pumps feature mechanical or packing seals, primarily comprising water segments and a sealed body filler, along with retaining ring components at the tail cover. The seal chamber is integral to ensuring proper water sealing, cooling, and lubrication. For SHD pumps, seal water is sourced from the pump's internal pressure, while SHDG models use cooling water or ambient temperature water from an external source. The seal water pressure should exceed the seal chamber's pressure by 0.05-0.1 MPa, and the cooling water pressure should range between 0.15-0.3 MPa.

Additionally, these pumps are directly driven by a prime mover through a flexible coupling, ensuring efficient operation. The pump rotates in a clockwise direction, as viewed from the prime mover's end.

Our SHD and SHDG single-suction, multistage segmental type centrifugal booster pumps offer versatility, being capable of operation via an electric motor or a diesel engine.

Detailed Photos

In the realm of multistage centrifugal pumps, the high thrust generated by impellers facing the same direction necessitates an advanced solution. Enter the thrust balance device, which can take the form of a balance disc or balance drum. This ingenious mechanism meticulously reduces the thrust to a level comfortably managed by a standard-sized thrust bearing, ensuring optimal performance and longevity.
Our impellers are crafted from a variety of robust materials, including cast iron, cast steel, stainless steel, and bronze, each chosen for their exceptional durability and specific performance benefits.

Efficient and Adaptable Flexible Couplings
Flexible couplings stand apart from their rigid counterparts by adeptly accommodating movement—be it vibrations or thermal expansion—without incurring damage. Their design makes them perfect for scenarios where some degree of misalignment between the drive and pump shafts is unavoidable. They excel at dampening vibrations, effectively curbing excessive operational noise. While their design is more complex and costly, the long-term advantages are undeniable. They safeguard shafts and bearings from damage and premature wear, translating into significant maintenance savings over time.
We incorporate wear-resisting disc couplings or pin couplings to ensure durability and reliability.

Packing seals have long reigned as the go-to sealing solution, employing rope-like materials to wrap around a pump shaft, filling voids, and minimizing fluid escape. However, as time progresses, material wear can lead to increased fluid loss and may complicate lubrication or replacement procedures essential for optimal functionality.

In a world where leakage must be avoided, mechanical seals are favored over traditional packing seals. They surpass their predecessors in durability, designed to endure rigorous conditions. With multiple sealing points, basic mechanical seals significantly mitigate leakage, ensuring reliable performance across diverse 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

These pumps are essential in pressure boosting systems, ensuring a reliable and steady flow and pressure across a variety of demanding scenarios. Key projects that typically utilize a horizontal multistage pump include:
Mine dewatering projects, where effective water removal is critical for safe and efficient operations.
High density living applications, providing reliable water pressure for residential buildings and complexes.
Snow making systems, ensuring optimal water flow for artificial snow production.
Boiler feed systems, supplying water efficiently to the boiler for consistent heating performance.
Reverse Osmosis installations, critical for efficient desalination and water purification processes.
A wide range of industrial applications, where robust and reliable water transport is necessary for various processes.
Condensate handling, for the effective management of condensed steam in power plants and heating systems.
High pressure cleaning/wash down facilities, delivering powerful water streams for thorough cleaning processes.
Jacking pumps for fire hydrant systems, ensuring readiness and pressure consistency in emergency situations.
Irrigation and fire hose feel supply, vital for maintaining landscapes and ensuring fire safety with reliable water access.
Shower systems, providing consistent water pressure for enhanced shower experiences.
Co-generation facilities, optimizing the use of resources by supplying water for combined heat and power production.
Spray systems, enabling efficient and even distribution of water for agricultural or industrial applications.
Pressure Boosting, enhancing water pressure in supply networks for a variety of commercial and residential uses.

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.