Versatile Stainless Steel Booster Pump for High Pressure 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

Introducing the SHD and SHDG series: quintessential single-suction multistage segmental centrifugal pumps, engineered to seamlessly transport water or fluids with properties akin to water, devoid of solid particles. With the SHD variant, experience exceptional fluid transmission at temperatures below 80 ºC, perfect for mining operations, industrial factories, and urban drainage. The SHDG variant caters to higher temperature applications, efficiently handling fluids up to 105 ºC, making it the ideal choice for boiler feed pumps and hot water delivery in various demanding scenarios.

Structural features
The SHD and SHDG pump types boast a robust construction composed of a stator, rotor, bearings, and a sophisticated shaft seal.
1. Stator Part: Comprising an inhalation section, middle, and spit segment, complemented by guide vanes and clamping segments, all secured with tension bolts for optimal operation. The SHD model features a horizontal inlet paired with a vertical outlet, while the SHDG model offers both inlet and outlet in a vertical orientation, tailored for diverse applications.
2. Rotor Parts: A masterful assembly featuring a shaft, impeller, balance plate, and bushings. The shaft delivers power directly to the impeller, ensuring seamless operation. Axial forces are expertly balanced by the balance plate. For added durability, both shaft ends are equipped with replaceable shaft sleeves.
3. Bearing Part: Equipped with two types of bearings - rolling and sliding:
Sliding Bearing: Composed of a bearing body, caps, bearing, dust disc, oil level gauge, and rejection mooring rings, all lubricated with thick oil for prolonged service life. Rolling Bearing: Comprising the main body, bearings, and gland, utilizing grease lubrication to ensure smooth performance.
4. Shaft Seal Parts: Choose between a mechanical seal or packing seal, featuring a water segment and sealed body filler, complemented by retaining ring components at the tail cover letter. The seal chamber liquid ensures water sealing, cooling, and lubrication. SHD pumps derive seal water from internal pressure, whereas SHDG pumps utilize external cooling water, maintaining normal temperatures. Seal water pressure is optimized between 0.05-0.1MPa, while cooling water pressure is maintained at 0.15-0.3MPa for impeccable performance.

Additionally, these pumps are expertly driven by a prime motor with flexible coupling, ensuring a seamless and efficient clockwise rotation when viewed from the prime motor end.

The versatile SHD and SHDG single-suction multistage segmental centrifugal booster pumps can be powered by either an electric motor or a diesel engine, providing adaptability across various power needs.

Detailed Photos

In the realm of multistage centrifugal pumps, the considerable thrust generated by impellers aligned in the same direction is adeptly managed with a thrust balance device. This advanced mechanism, typically a balance disc or balance drum, significantly reduces the otherwise unmanageable thrust to levels that can be efficiently handled by a standard-sized thrust bearing, ensuring optimal performance and longevity.
The choice of impeller material is diverse to meet various industrial needs, ranging from robust cast iron and cast steel to resilient stainless steel and bronze, offering flexibility and reliability for multiple applications.

Flexible couplings
Flexible couplings, unlike their rigid counterparts, are engineered to accommodate certain movements such as vibrations and thermal expansion, preventing any damage. This design makes them exceptionally suited for scenarios with unavoidable misalignment between drive and pump shafts. Their capacity to absorb vibrations effectively reduces operational noise. While they possess a more complex and costly design, the benefits are substantial. Flexible couplings safeguard the shaft and bearings from damage and premature wear, translating into significant maintenance savings over time.
We employ highly durable wear-resisting disc coupling or pin coupling to ensure reliable performance.

Packing seals have traditionally been the go-to sealing solution for many years. These seals employ rope-like materials that wrap around a pump shaft, effectively filling dead space and minimizing fluid loss. However, with use, fluid loss may gradually increase as the gland packing material wears down, potentially impairing regular lubrication and ease-of-replacement required for optimal functioning.

Mechanical seals are increasingly favored over traditional packing seals in a broad spectrum of applications where preventing leakage is paramount. These modern seals are not only more durable, but they are also meticulously designed to withstand greater wear. Basic mechanical seals utilize multiple sealing points to virtually eliminate leakage issues, promising superior performance and reliability.

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 integral to pressure boosting systems, specifically designed to maintain reliable flow and pressure as demanded by various high-stakes scenarios. Among the myriad of projects that thrive with the integration of a horizontal multistage pump, the most prevalent include:
Efficient Mine Dewatering
Supporting High Density Living Environments
Snow Making for Optimal Conditions
Boiler Feed Systems for Seamless Operations
Reverse Osmosis for Purification Processes
Diverse Industrial Applications
Condensate Removal
High Pressure Cleaning and Wash Down Facilities
Jacking Pumps for Robust Fire Hydrant Systems
Irrigation and Fire Hose Feel Supply for Efficient Distribution
Powerful Shower Experiences
Co-generation Systems
Precision Spray Applications
Reliable Pressure Boosting Solutions

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.