High Performance Centrifugal Boiler Feed Pump with Flexible Pins Coupling

• 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, engineered to perfection for the seamless conveyance of water and fluids with similar physical and chemical properties. These pumps are adept at handling liquids free from solid particles. The SHD variant excels in transporting fluids with temperatures not exceeding 80 ºC, making it ideal for applications in mines, factories, and urban drainage systems. On the other hand, the SHDG model is designed to efficiently manage fluids with temperatures up to 105 ºC, perfectly suited for boiler feed operations or the transportation of hot water in various scenarios.

Structural Features
The SHD and SHDG pumps are meticulously crafted, comprising key components such as the stator, rotor, bearings, and shaft seal, ensuring optimal performance and reliability.
1. Stator Part: A masterpiece of engineering, the stator is mainly composed of the inhalation, middle and spit sections, along with guide vanes. These elements are securely held together with tension bolts to ensure smooth operation. The SHD pump features a horizontal inlet and a vertical outlet, while the SHDG variant boasts both vertical inlet and outlet configurations.
2. Rotor Parts: At the core of the rotor, you'll find the shaft, impeller, balance plate, and bushings, all working in harmony. The shaft channels power to the impeller, enabling it to function effectively. The ingenious balance plate ensures the equilibrium of axial forces, while both ends of the shaft are fitted with replaceable sleeves for added protection.
3. Bearing Part: These pumps utilize two sophisticated types of bearings: rolling and sliding bearings.
The sliding bearings comprise the bearing body, caps, dust disk, oil level gauge, rejection mooring rings, and other vital components, all lubricated with thick oil for smooth operation. Meanwhile, the rolling bearings include the main body, bearings, and gland, with grease lubrication ensuring optimal functionality.
4. Shaft Seal Parts: These critical components ensure the integrity of the pump, employing either mechanical or packing seals. They include the water segment, sealed body filler, and retaining ring components at the tail cover. The seal chamber liquid serves multiple purposes: water sealing, cooling, and lubrication. The SHD pump draws seal water from the pressure water within the pump, whereas the SHDG model uses cooling water from outside sources. To maintain reliability, seal water pressure should exceed the seal chamber by 0.05-0.1MPa, and the cooling water pressure should be maintained between 0.15-0.3MPa.

Additionally, the pump is elegantly driven directly by a prime motor through a flexible coupling, showcasing clockwise rotation when viewed from the prime motor end, ensuring robust and efficient operation.

The versatile SHD and SHDG single-suction, multistage, segmental type centrifugal booster pumps offer flexibility in operation, being compatible with either electric motors or diesel engines as their power source.

Detailed Photos

In the realm of multistage centrifugal pumps, the challenge of managing the high thrust generated by impellers positioned in the same orientation is elegantly addressed. By incorporating a sophisticated thrust balance device, such as a balance disc or balance drum, we efficiently reduce this thrust to levels easily managed by a standard-sized thrust bearing. This innovative solution ensures reliable and optimal pump performance.
Our impellers are crafted from top-tier materials, offering a choice among robust cast iron, durable cast steel, resilient stainless steel, and timeless bronze. Each material ensures longevity and exceptional performance across diverse applications.

Innovative Flexible Couplings
In contrast to their rigid counterparts, flexible couplings offer remarkable adaptability by accommodating certain movements like vibrations and thermal expansion with effortless grace. This adaptability makes them the perfect choice for environments where some misalignment between drive and pump shafts is simply unavoidable. Their ability to absorb vibrations significantly reduces excess operating noise, contributing to a quieter work environment. While they feature a more intricate and costly design, the long-term benefits are substantial. Flexible couplings safeguard shafts and bearings against damage and early wear, leading to substantial maintenance cost savings over time.
We incorporate high-performance wear-resistant disc or pin couplings for unmatched durability and efficiency.

Packing seals have long been the cornerstone of sealing solutions, employing rope-like materials to encircle pump shafts, effectively filling gaps and curbing fluid loss. However, as time passes, these materials can wear down, leading to increased leakage and potentially hindering regular lubrication or replacement flexibility.

In applications where leak prevention is paramount, mechanical seals are the superior choice over traditional packing seals. Engineered for durability, these advanced seals are designed to withstand rigorous conditions and provide a near-impeccable seal with 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

Our High Performance Centrifugal Boiler Feed Pump with Flexible Pins Coupling excels in pressure boosting systems. These pumps are meticulously designed to deliver a consistent flow and pressure, making them indispensable for various demanding scenarios. Here are some prevalent projects that extensively benefit from horizontal multistage pumps:
Expert mine dewatering operations
High-density urban living solutions
Efficient snow making systems
Reliable boiler feed systems
Advanced Reverse Osmosis processes
Versatile industrial applications
Condensate management efficiency
High-pressure cleaning and wash down facilities
Jacking pumps for robust fire hydrant systems
Irrigation and fire hose feed supply systems
Luxurious showers
Innovative co-generation projects
Effective spray systems
Dynamic pressure boosting mechanisms

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.