Efficient Electric High Pressure Centrifugal Pump for Boiler Applications

• 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

Discover the ultimate solution in fluid transmission with our SHD and SHDG single-suction multistage segmental centrifugal pumps. Expertly engineered to handle fluids similar in properties to water, these pumps boast efficiency without compromise. Our SHD models are perfect for mining, industrial applications, and urban drainage systems, reliably operating with fluid temperatures below 80 ºC. For those demanding boiler feed and hot water delivery, the SHDG pumps are your ideal choice, accommodating temperatures up to 105 ºC.

Structural Features
The SHD and SHDG pumps are masterpieces of engineering, crafted from key components such as the stator, rotor, bearings, and shaft seal, ensuring optimal performance.
1. Stator Part: This robust section comprises the inhalation, middle, and discharge segments, including guide vanes. All are secured with tension bolts for seamless operation. The SHD pump uniquely features a horizontal inlet and vertical outlet, while the SHDG pump is designed with vertical inlets and outlets for versatile application.
2. Rotor Parts: The heart of the pump, composed of the shaft, impeller, balance plate, and bushings. The shaft transmits power, energizing the impeller; axial forces are expertly managed by the balance plate. Protection is ensured with replaceable shaft sleeves at both ends.
3. Bearing Part: Engineered for reliability with two types of bearings: rolling and sliding bearings.
Sliding bearings include components such as the bearing body, caps, dust disk, oil level gauge, and mooring rings, relying on thick oil for lubrication. Rolling bearings consist of the main body, bearings, and gland, using grease for smooth operation.
4. Shaft Seal Parts: Our pumps offer advanced sealing with either mechanical or packing seals, supported by water segments and retaining rings. The seal chamber liquid provides essential water sealing, cooling, and lubrication. SHD pumps draw seal water internally, while SHDG models utilize external cooling water. Seal water pressure must exceed chamber pressure by 0.05-0.1MPa, with cooling water pressure maintained at 0.15-0.3MPa.

Moreover, the pump is directly powered by a prime motor through a flexible coupling, ensuring efficient and reliable operation. From the motor end, the pump rotates in a clockwise direction.

Our SHD and SHDG centrifugal booster pumps offer flexibility, driven by either an electric motor or a diesel engine, to meet your diverse operational needs.

Detailed Photos

Within the realm of multistage centrifugal pumps, a remarkable phenomenon occurs: the generation of high thrust due to the uniform orientation of the impellers. To counterbalance this, an ingenious thrust balance device comes into play, such as a balance disc or balance drum. This device masterfully reduces the thrust to a manageable level, compatible with standard-sized thrust bearings, ensuring smooth and efficient operation.
The impeller material options include robust and reliable options such as cast iron, cast steel, stainless steel, and bronze, catering to a range of demands and applications.

Flexible Couplings
Flexible couplings stand in contrast to their rigid counterparts by offering the remarkable ability to accommodate movement, such as vibrations and thermal expansion, without sustaining damage. This unique attribute renders them ideal for scenarios where a degree of unavoidable misalignment exists between drive and pump shafts. Their proficiency in absorbing vibrations also serves to minimize excessive operating noise. While flexible couplings boast a more intricate and costly design, the long-term benefits they provide by safeguarding shafts and bearings against damage and premature wear translate into considerable maintenance savings over time.
For our applications, we choose from wear-resistant disc couplings or pin couplings, both offering superior durability and performance.

Packing seals have historically been the go-to sealing solution, employing rope-like materials to snugly wrap around a pump's shaft, effectively filling gaps and curbing fluid loss. However, as time progresses, these seals may experience increased fluid loss due to the wear of gland packing material, potentially complicating regular lubrication and ease of replacement, which are crucial for optimal functionality.

In situations where leakage issues must be meticulously avoided, mechanical seals have become the preferred choice over traditional packing seals. These seals are engineered for durability, capable of withstanding significant stress. With multiple sealing points, basic mechanical seals are designed to virtually eliminate leakage concerns, offering a more reliable solution across various demanding 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

Pressure boosting systems commonly employ these pumps. These systems often require a reliable and consistent flow, along with sustained pressure. Some of the most frequent applications for horizontal multistage pumps include:
Mine dewatering: Essential for maintaining operational efficiency by removing water from mining sites.
High density living: Providing stable water pressure in residential high-rise buildings to ensure comfort and convenience.
Snow making: Facilitating artificial snow production for ski resorts and recreational areas.
Boiler feed systems: Enhancing efficiency by supplying necessary water pressure for boiler operations.
Reverse Osmosis: Vital for water purification processes by delivering steady pressure for optimal filtration.
Industrial applications: Serving diverse industrial sectors by maintaining consistent pressure and flow for various processes.
Condensate: Efficient handling and transfer of condensate in steam and heating systems.
High pressure cleaning/wash down facilities: Ensuring thorough and effective cleaning with high-pressure capabilities.
Jacking pumps for fire hydrant systems: Providing crucial pressure support for emergency fire-fighting systems.
Irrigation and fire hose feed supply: Reliable water supply for agricultural irrigation and emergency fire-fighting needs.
Showers: Delivering consistent water pressure for enhanced shower experiences.
Co-generation: Supporting energy-efficient power and heat generation systems.
Spray: Ensuring optimal performance in spray systems for various applications.
Pressure Boosting: Enhancing water distribution systems by maintaining high pressure and flow rates.

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.