Premium Cast Iron High Pressure Pump with Mechanical Seal Technology

• 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, our advanced single-suction multistage segmental centrifugal pumps, expertly engineered for the efficient conveyance of water and fluids with similar physical and chemical properties. These high-performance pumps are meticulously crafted to handle fluids devoid of solid particles, making them ideal for a variety of applications. With the SHD model designed for fluid temperatures under 80 ºC, it is perfectly suited for mines, factories, and urban drainage systems. Meanwhile, the SHDG model excels at managing fluid temperatures up to 105 ºC, making it the preferred choice for boiler feed pumps or the transfer of hot water in similar scenarios.

Structural features
The SHD and SHDG pump models boast a robust construction, comprising essential components such as the stator, rotor, bearings, and a sophisticated shaft seal system.
1, Stator part: This vital section is composed of the inhalation, middle, and discharge segments along with precision guide vanes. These elements are securely clamped using tension bolts, ensuring smooth operation. The SHD model features a horizontal inlet and a vertical outlet configuration, whereas the SHDG model is designed with both vertical inlet and outlet connections, catering to a broader range of installation requirements.
2, Rotor parts: This critical assembly includes the main shaft, impeller, balance plate, and protective bushings. The shaft transmits power effectively to the impeller, facilitating optimal performance while the balance plate effectively neutralizes axial forces. Both ends of the shaft are safeguarded by replaceable shaft sleeves, ensuring prolonged durability and maintenance convenience.
3, Bearing part: Featuring two distinguished types of bearings: rolling bearings and sliding bearings.
The sliding bearing assembly consists of a robust bearing body, caps, dust disk, oil level gauge, and rejection mooring rings, all lubricated using thick oil for longevity and reliability. Meanwhile, the rolling bearing assembly includes the primary bearing structure and gland, benefitting from grease lubrication for seamless operation.
4, Shaft seal parts: Equipped with either a mechanical seal or packing seal, these components are intricately designed with a water segment and a sealed body filler. The assembly includes a retaining ring and components at the tail cover letter, ensuring a superior sealing function. The seal chamber is enhanced with water for sealing, cooling, and lubrication purposes. For the SHD pump, seal water is sourced from the pump's internal pressure water, while the SHDG model utilizes external cooling water or normal temperature water. The seal water pressure must exceed the chamber's by 0.05-0.1MPa, while the cooling water pressure should be maintained at 0.15-0.3MPa.

Furthermore, the pump is seamlessly driven directly by a prime motor through a flexible coupling, ensuring smooth and reliable operation. Designed for clockwise rotation when viewed from the prime motor end, it exemplifies precision engineering and performance.

The versatile SHD and SHDG single-suction multistage segmental centrifugal booster pumps can be powered by either an electric motor or a diesel engine, offering flexible solutions to meet diverse operational needs.

Detailed Photos

In multistage centrifugal pumps, a significant thrust is generated due to the impellers aligned in the same direction. To counteract this force, a thrust balance device, such as a balance disc or balance drum, is incorporated. This innovative mechanism gracefully reduces the thrust to manageable levels, making it compatible with a standard-sized thrust bearing, ensuring optimal performance and durability.
The impeller material options include robust cast iron, enduring cast steel, resilient stainless steel, and versatile bronze, providing choices that cater to varied applications and preferences.

Flexible couplings
Unlike rigid couplings, flexible couplings are expertly designed to accommodate movement, such as vibrations and thermal expansion, without incurring any damage. This makes them perfectly suited for scenarios where unavoidable misalignment exists between the drive and pump shafts. Their ability to absorb vibrations also significantly reduces excessive operational noise. While this advanced design translates to a more complex and costly option, the investment is advantageous. Flexible couplings not only protect shafts and bearings from damage and premature wear but also result in substantial maintenance cost savings over time.
Our selection includes the wear-resisting disc coupling or the efficient pin coupling, both epitomizing durability and performance.

Packing seals have traditionally dominated as the preferred sealing solution, utilizing rope-like materials that encircle the pump shaft. They effectively fill dead space, minimizing fluid loss. However, as the gland packing material begins to wear over time, fluid loss tends to increase, potentially hindering regular lubrication or ease of replacement necessary for optimal function.

Mechanical seals surpass traditional packing seals in various applications where avoiding leakage is crucial. Renowned for their durability, mechanical seals are engineered to endure significantly more stress. These sophisticated seals utilize multiple sealing points to virtually eliminate leakage issues, offering enhanced reliability in demanding conditions.

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 advanced pumps are the heartbeat of pressure boosting systems, meticulously designed to ensure a steadfast and uninterrupted flow with unwavering pressure. They are pivotal in a variety of substantial projects, especially where horizontal multistage pumps are indispensable. Some of the most typical applications include:
Mine dewatering - expertly engineered to drain excess water efficiently, maintaining safety and operational efficiency.
High density living - ensuring consistent water pressure for urban and densely populated residential areas.
Snow making - vital for generating artificial snow in ski resorts, delivering reliability even in challenging conditions.
Boiler feed systems - crucial for maintaining precise water levels and pressure in boilers for optimal performance.
Reverse Osmosis - playing a key role in water purification systems, ensuring high-grade filtration and pressure control.
Industrial applications - serving diverse industrial needs with robust and dependable pumping solutions.
Condensate - effectively handling condensate return in various heating and cooling systems.
High pressure cleaning/wash down facilities - providing powerful water pressure for extensive cleaning requirements.
Jacking pumps for fire hydrant systems - essential for boosting water pressure in fire safety systems, ensuring readiness and reliability.
Irrigation and fire hose feel supply - delivering consistent water flow for both agricultural irrigation and fire emergency needs.
Showers - enhancing everyday comfort and luxury with improved water pressure for domestic showers.
Co generation - supporting energy-efficient systems with reliable pressure management.
Spray - perfect for various spraying applications, ensuring precision and consistency.
Pressure Boosting - the quintessential solution for elevating water pressure across multiple scenarios.

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.