Advanced High Pressure Centrifugal Pump for Efficient Water Supply

• 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 - a pinnacle of engineering excellence in single-suction multistage segmental centrifugal pumps. These robust pumps are designed to transport water and fluids with similar physical and chemical properties, minus solid particles. Our SHD pumps excel in transferring fluids with temperatures up to 80 ºC, making them ideal for applications in mining, industrial plants, and urban drainage systems. Meanwhile, the SHDG variant is adept at handling fluids with temperatures reaching up to 105 ºC, perfectly suited for boiler feed systems and hot water delivery, as well as other high-temperature contexts.

Structural Features
Crafted with precision, our SHD and SHDG pumps comprise essential components: stator, rotor, bearings, and shaft seal, each meticulously designed to ensure optimal performance and longevity.
1, Stator Part: This section includes components such as the suction, middle, and discharge sections, along with guide vanes, all held together securely by tension bolts. Notably, the SHD model offers a horizontal inlet and vertical outlet, while the SHDG model features vertical inlet and outlet configurations, catering to diverse installation requirements.
2, Rotor Parts: These consist of the main shaft, impeller, balance plate, and protective bushings. The shaft is pivotal, transferring power seamlessly to the impeller and facilitating operation. The balance plate adeptly stabilizes axial force, while replaceable shaft sleeves at both ends enhance durability and protection of the shaft.
3, Bearing Part: Our pumps incorporate two types of bearings—rolling and sliding bearings—for enhanced reliability and performance.
Sliding bearings comprise multiple components including the bearing body, caps, and dust disk, supplemented by an oil level gauge and rejection mooring rings, all lubricated by thick oil. Rolling bearings include the main body and gland, with grease as the lubricant of choice, ensuring smooth operation.
4, Shaft Seal Parts: Choose between mechanical or packing seals, each with comprehensive components such as water segment, sealed body filler, and retaining ring, all situated at the tail cover. The seal chamber liquid serves critical roles in water sealing, cooling, and lubrication. The SHD pump utilizes pressure water within the pump for sealing, while the SHDG pump employs external cooling water. It's vital that seal water pressure exceeds the seal chamber by 0.05-0.1MPa, with cooling water pressure ranging from 0.15-0.3MPa.

Moreover, these pumps are directly powered by a prime motor via a flexible coupling, ensuring efficient operation. The pump rotates clockwise when viewed from the prime motor end, a hallmark of its engineering finesse.

The versatile SHD and SHDG centrifugal booster pumps are adaptable, capable of being driven by either electric motors or diesel engines, thus meeting a variety of operational and power needs seamlessly.

Detailed Photos

In the realm of multistage centrifugal pumps, the impressive thrust generated arises from impellers aligned in a singular direction. To expertly manage this formidable force, a thrust balance device, such as a balance disc or balance drum, is employed. This crucial component ingeniously minimizes the thrust, bringing it down to a level that can be effortlessly handled by a standard-sized thrust bearing, ensuring seamless and efficient operation.
The impeller boasts a variety of robust materials including cast iron, cast steel, stainless steel, and bronze, each chosen for specific applications to enhance durability and performance.

Innovative Flexible Couplings
Flexible couplings, unlike their rigid counterparts, provide exceptional accommodation for movement such as vibrations and thermal expansion, preventing damage and ensuring optimal functionality. Such flexibility makes them indispensable for scenarios involving inevitable misalignment between drive and pump shafts. Additionally, their superb vibration absorption contributes to a significant reduction in operational noise. Despite their complex and premium design, flexible couplings offer long-term maintenance cost savings by safeguarding shafts and bearings against damage and premature wear.
Our selection includes wear-resisting disc couplings or sturdy pin couplings, tailored to enhance durability and reliability.

Packing seals, renowned for their extensive usage, employ rope-like materials that adeptly encircle the pump shaft, effectively filling gaps and minimizing fluid loss. However, as the gland packing material succumbs to wear over time, fluid loss may gradually increase, potentially affecting lubrication and ease of replacement, which are vital for optimal performance.

Mechanical seals are the premier choice over traditional packing seals in applications where leakage prevention is paramount. These advanced seals surpass their predecessors in durability, withstanding greater challenges. By utilizing multiple sealing points, mechanical seals dramatically reduce leakage risks, offering peace of mind in demanding environments.

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, as they are designed to meet the demands of constant flow and pressure. Some of the most prevalent projects that utilize a horizontal multistage pump include:
Mine dewatering: Efficiently remove water from mining sites, ensuring safety and productivity.
High density living: Maintain steady water pressure in urban residential complexes.
Snow making: Essential for creating snow in ski resorts and recreational areas.
Boiler feed systems: Deliver the necessary water pressure and flow for optimal boiler performance.
Reverse Osmosis: Provide high-pressure water supply for purification processes.
Industrial applications: Cater to a variety of industrial needs with reliable water pressure and flow.
Condensate: Manage and move condensate efficiently in various systems.
High pressure cleaning/wash down facilities: Ensure powerful cleaning processes with high-pressure water.
Jacking pumps for fire hydrant systems: Provide critical pressure for emergency fire suppression systems.
Irrigation and fire hose feel supply: Deliver reliable water supply for agricultural irrigation and fire prevention measures.
Showers: Experience consistent water flow for everyday comfort and convenience.
Co-generation: Support combined heat and power systems with efficient water supply.
Spray: Enable effective spraying operations in agricultural and industrial setups.
Pressure Boosting: Enhance overall system pressure with advanced pumping technology.

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.