Advanced Mechanical Seal Multistage Pump for High Efficiency Water Boosting

• 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—an exceptional range of single-suction multistage segmental centrifugal pumps crafted for superior water transmission. These pumps are perfect for fluids akin to water, free from solid particles. The SHD model expertly handles fluid temperatures below 80 ºC, making it ideal for use in mines, factories, and urban drainage systems. Meanwhile, the SHDG model excels in situations requiring fluid temperatures up to 105 ºC, making it the perfect choice for boiler feed applications and the transfer of hot water.

Structural Features
Crafted with precision, SHD and SHDG pumps feature a robust assembly of stator, rotor, bearings, and shaft seals, all designed for optimal performance and durability.
1, Stator Part: Comprised of components such as the inhalation, middle, and discharge sections, along with guide vanes. These parts are secured with tension bolts for seamless operation. The SHD type is engineered with a horizontal inlet and vertical outlet, while the SHDG boasts both inlet and outlet in a vertical alignment.
2, Rotor Parts: This section includes vital components like the shaft, impeller, balance plate, and bushings. The shaft delivers power to the impeller, ensuring efficient functionality. Axial forces are expertly managed by the balance plate, with the shaft ends protected by replaceable sleeves.
3, Bearing Part: Featuring two types of bearings—rolling and sliding—each designed for longevity and reliability.
Sliding Bearings: Composed of a bearing body, caps, dust disk, oil level gauge, and mooring rings, these components are lubricated with thick oil. Rolling Bearings: These consist of the main body, bearings, and gland, all utilizing grease lubrication for smooth operation.
4, Shaft Seal Parts: Options include mechanical or packing seals, featuring a water segment and sealed body filler. The seal chamber is liquid-filled to provide water sealing, cooling, and lubrication. For the SHD model, seal water is sourced from within the pump, while for the SHDG model, it's drawn from external cooling water. Seal water pressure must exceed the seal chamber by 0.05-0.1MPa, with cooling water pressure between 0.15-0.3MPa.

Additionally, the pump is seamlessly driven by a primary motor via a flexible coupling, ensuring reliable, clockwise rotation as viewed from the motor's end.

The versatile SHD and SHDG centrifugal booster pumps are adaptable for operation with either an electric motor or a diesel engine, offering flexibility and high performance for a variety of applications.

Detailed Photos

In the realm of multistage centrifugal pumps, the significant thrust generated by impellers oriented in the same direction is effectively managed by a sophisticated thrust balance device. This device, such as a balance disc or balance drum, artfully reduces the thrust to manageable levels, ensuring smooth operation supported by a standard-sized thrust bearing.
Crafted with precision, the impellers can be made from a selection of robust materials including cast iron, cast steel, stainless steel, and bronze, each chosen for durability and performance under demanding conditions.

Flexible Couplings
Unlike their rigid counterparts, flexible couplings are engineered to accommodate movement, such as vibrations and thermal expansion, without incurring damage. This adaptability makes them perfect for situations involving unavoidable misalignment between drive and pump shafts. Not only do they excel in absorbing vibrations, which helps in reducing operating noise, but these couplings also offer long-term savings due to their protective nature, safeguarding shafts and bearings against damage and premature wear, despite their more complex and costly design.
Our coupling solutions feature wear-resisting disc couplings or pin couplings, ensuring reliability and longevity.

For decades, packing seals have been a staple in sealing solutions, utilizing rope-like materials wrapped around the pump shaft to fill gaps and minimize fluid escape. However, as the gland packing material wears down over time, fluid loss can increase, potentially complicating lubrication and replacement processes.

Mechanical seals are the go-to choice over traditional packing seals for applications where leakage must be avoided. Renowned for their durability, mechanical seals are engineered to endure substantial usage. By employing multiple sealing points, they practically eradicate leakage issues, setting a new standard in sealing efficiency.

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 Advanced Mechanical Seal Multistage Pump for High Efficiency Water Boosting is the cornerstone of pressure boosting systems. These systems often require an unwavering flow and steady pressure, and our pump delivers just that. Here are some of the key projects that typically utilize a horizontal multistage pump:
Mine dewatering – An essential application, ensuring water removal is efficient and reliable.
High density living – Perfect for urban developments needing consistent water pressure.
Snow making – Ensures optimal snow production in winter resorts and ski areas.
Boiler feed systems – Ideal for feeding water into boilers with precision and control.
Reverse Osmosis – Facilitates water purification with exceptional efficacy.
Industrial applications – Versatile for a wide array of industrial water-boosting needs.
Condensate – Efficiently manages condensate recovery and transfer.
High pressure cleaning/wash down facilities – Provides powerful and thorough cleaning capabilities.
Jacking pumps for fire hydrant systems – Ensures rapid readiness and performance of fire safety systems.
Irrigation and fire hose feed supply – Delivers exceptional pressure for irrigation and fire safety.
Showers – Offers luxurious, consistent water flow for an unmatched shower experience.
Co-generation – Supports efficient energy and resource conservation in co-gen systems.
Spray – Ensures precise and even spray applications across various sectors.
Pressure Boosting – Reliable and robust boosting, elevating water pressure for diverse applications.

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.