High Performance Horizontal Multistage Pump for Reliable Boiler Feeding

• 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

The SHD and SHDG series represent the pinnacle of single-suction multistage segmental centrifugal pump technology, meticulously engineered for the seamless conveyance of water or fluids with similar physical and chemical properties, devoid of solid particles. These pumps exude versatility: the SHD model is adept at handling fluids up to 80 ºC, making it an ideal choice for a variety of applications including mines, industrial factories, and urban drainage systems. Meanwhile, the SHDG variant excels in transmitting fluids up to 105 ºC, perfectly suited as a boiler feed pump or for the efficient delivery of hot water in diverse settings.

Structural Features
The robust design of the SHD and SHDG pumps comprises four core components: stator, rotor, bearings, and shaft seal, each crafted with precision to ensure optimal performance and longevity.
1. Stator Part: This integral component includes the suction, middle, discharge sections, and guide vanes, all securely clamped with tension bolts to enhance stability during operation. The SHD model features a horizontal inlet and vertical outlet configuration, while the SHDG model is designed with vertical inlets and outlets, providing flexible integration into various systems.
2. Rotor Parts: These include the shaft, impeller, balance plate, and bushings—crucial elements that ensure seamless power transfer from the shaft to the impeller. The innovative balance plate effectively neutralizes axial forces, while the replaceable shaft sleeve ensures protection and extended equipment lifespan at both ends.
3. Bearing Part: Our pumps feature two types of bearings, rolling and sliding, each with distinct structural benefits.
Sliding bearings consist of the bearing body, caps, dust disk, oil level gauge, and rejection rings, lubricated with thick oil for smooth operation. Rolling bearings, comprising the main body, bearings, and gland, utilize grease lubrication for enhanced durability and performance.
4. Shaft Seal Parts: The pumps employ either a mechanical seal or a packing seal, composed of a water segment, seal body filler, and retaining ring components at the tail cover. The seal chamber liquid functions as a water seal, offering water-cooled and water-lubricated protection. The SHD pump derives its seal water from internal pressure, while the SHDG pump uses external cooling water. Seal water pressure must exceed the chamber pressure by 0.05-0.1MPa, and cooling water pressure should be 0.15-0.3MPa for optimal efficiency.

Moreover, the pump is directly driven with precision by a prime motor through a flexible coupling, ensuring smooth, clockwise rotation when viewed from the motor end, thus enhancing operational reliability.

The adaptable SHD and SHDG single-suction multistage segmental centrifugal booster pumps can be efficiently powered by either an electric motor or a diesel engine, allowing for versatile application in various demanding environments.

Detailed Photos

In the realm of multistage centrifugal pumps, significant thrust is generated as the impellers align in one direction. To manage this formidable force, a thrust balance device like a balance disc or balance drum is incorporated. This innovative mechanism effectively reduces the thrust, bringing it to a manageable level that can be handled comfortably by a standard-sized thrust bearing, ensuring optimal performance and longevity.
The impeller material selection is diverse, offering options in cast iron, cast steel, stainless steel, and bronze, each providing unique advantages tailored to specific operational needs.

Versatile and Durable Flexible Couplings
In contrast to rigid couplings, flexible couplings are engineered to accommodate movements such as vibrations and thermal expansions without incurring damage. This makes them remarkably suited for scenarios where some degree of unavoidable misalignment exists between the drive and pump shafts. Their ability to effectively absorb vibrations also helps reduce excessive operational noise. Despite their complex and somewhat costly design, the long-term benefits of flexible couplings are substantial. By safeguarding the shaft and bearings from damage and premature wear, they offer considerable maintenance savings over time.
Our selection includes wear-resisting disc couplings and pin couplings, renowned for their durability and reliability in challenging conditions.

Packing seals have long been the cornerstone of sealing solutions, utilizing rope-like materials to wrap around the pump shaft, effectively filling voids and minimizing fluid loss. However, as time progresses, the gland packing material may degrade, leading to increased fluid loss and potentially complicating lubrication and ease-of-replacement processes, which are critical for optimal functionality.

In numerous applications where leakage must be meticulously avoided, mechanical seals are increasingly favored over traditional packing seals. Renowned for their durability, mechanical seals are engineered to withstand greater challenges. They utilize multiple sealing points, dramatically minimizing leakage issues and offering a robust and reliable 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

In the realm of pressure boosting systems, our pumps are the go-to solution for maintaining a steady and consistent flow with unwavering pressure. These masterfully designed pumps are essential in scenarios that demand such reliability and performance. Explore the most prevalent projects benefiting from our high-performance horizontal multistage pump:
Efficient Mine Dewatering
High Density Urban Living Solutions
Innovative Snow Making
Dependable Boiler Feed Systems
Advanced Reverse Osmosis
Versatile Industrial Applications
Effective Condensate Recovery
Robust High Pressure Cleaning and Wash Down Facilities
Essential Jacking Pumps for Fire Hydrant Systems
Reliable Irrigation and Fire Hose Reel Supply
Invigorating Showers
Efficient Co-Generation Solutions
Comprehensive Spray Systems
Supreme 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.