Innovative Stainless Steel Boiler Feed Pump with Mechanical Seal Features

• 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: engineering marvels in single-suction, multistage, segmental-type centrifugal pump technology. These pumps are expertly designed for the seamless conveyance of water or fluids with physical and chemical characteristics akin to water and completely free from solid particles. The SHD pump can handle fluid temperatures below 80ºC, making it ideal for applications in mining, industrial factories, and urban drainage systems. In contrast, the SHDG pump excels in handling fluids at temperatures below 105ºC, perfectly adapted for use as a boiler feed pump or for transporting hot water in similar demanding scenarios.

Structural Features
The SHD and SHDG pumps boast a meticulously crafted design comprising a stator, rotor, bearings, and shaft seal, ensuring optimal performance and longevity.
1. Stator Part: This crucial component consists of suction, middle, and discharge sections, along with guide vanes, all securely held by tension bolts to form the operative segment. The SHD pump is engineered with a horizontal inlet and vertical outlet configuration, while the SHDG variant features both vertical inlet and outlet for enhanced adaptability in various installations.
2. Rotor Parts: Central to the pump's dynamic function, this assembly is composed of the shaft, impeller, balance plate, and bushings. The shaft transmits power to the impeller, facilitating its operation, while the balance plate meticulously neutralizes axial forces. For added durability, both ends of the shaft are equipped with replaceable sleeves, providing essential protection during operation.
3. Bearing Part: The pumps incorporate two types of bearings: rolling bearings and sliding bearings, each with distinct advantages.
Sliding bearings are thoughtfully designed with a bearing body, caps, bearings, dust disk, oil level gauge, and mooring rings, all lubricated with thick oil for smooth operation. Rolling bearings consist of a main body and gland, ensuring a reliable performance with grease lubrication.
4. Shaft Seal Parts: A choice of mechanical seal or packing seal is available, consisting of water segment and filler components, enclosed by retaining rings. The seal chamber liquid provides water sealing, cooling, and lubrication. The SHD pump derives seal water from its internal pressure, while the SHDG utilizes cooling water from an external source. Optimal pressure for seal water should exceed the chamber by 0.05-0.1MPa, while cooling water pressure should range from 0.15-0.3MPa.

Additionally, the pump operates with precision, directly driven by a prime motor through a flexible coupling, ensuring seamless and efficient clockwise rotation as viewed from the prime motor end.

The SHD and SHDG centrifugal booster pumps offer versatile power options, driven either by an electric motor or a diesel engine, catering to a broad range of application needs.

Detailed Photos

In the realm of multistage centrifugal pumps, a significant thrust is generated due to the impellers oriented in a singular direction. To counteract this, an ingenious thrust balance mechanism, such as a balance disc or balance drum, is employed. This mechanism expertly reduces the thrust to a manageable level, compatible with a standard-sized thrust bearing, ensuring seamless operation.
The impeller material selection offers versatility with options including robust cast iron, durable cast steel, sleek stainless steel, and elegant bronze.

Ingenious Flexible Couplings
In contrast to their rigid counterparts, flexible couplings are meticulously designed to embrace movement, absorbing vibrations and accommodating thermal expansion without sustaining damage. This adaptability makes them ideal for scenarios where misalignment between the drive and pump shafts is unavoidable. Their ability to absorb vibrations also translates into significant noise reduction, making operations more pleasant. Though their design is more complex and costly, the long-term benefits in terms of maintenance savings are substantial, as they effectively protect shafts and bearings from premature wear and damage.
Our selection features wear-resisting disc couplings or pin couplings, tailored for longevity and reliability.

Packing seals have long been the cornerstone of sealing solutions, employing rope-like materials to snugly wrap around the pump shaft, minimizing fluid loss. However, as time progresses, these seals may experience increased fluid loss due to wear, affecting lubrication and ease of replacement. Despite their widespread use, evolving needs demand more efficient solutions.

Mechanical seals have emerged as the superior choice over traditional packing seals, especially in applications where leakage is unacceptable. These seals are engineered for enhanced durability, capable of withstanding rigorous conditions. They incorporate multiple sealing points to virtually eliminate leakage issues, offering a reliable and robust solution.

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 exceptional pressure boosting systems are renowned for employing our high-performance pumps, masterfully designed for circumstances that demand unwavering flow and pressure. Horizontal multistage pumps are frequently the heroes behind some of the following prominent projects:
Mine dewatering - Perfect for efficiently managing water levels in mining operations, ensuring safety and operational continuity.
High density living - Ideal for urban environments, providing robust water pressure to meet the demands of modern high-rise living.
Snow making - Essential for creating pristine snow conditions in ski resorts, delivering reliable performance even in freezing temperatures.
Boiler feed systems - Critical for maintaining the efficiency and safety of boiler operations through precise pressure and flow control.
Reverse Osmosis - Integral to water purification processes, delivering the necessary pressure for optimal filtration and purity.
Industrial applications - Versatile solutions for a wide range of industrial processes, ensuring consistent performance under rigorous conditions.
Condensate - Efficiently recirculating condensed steam back into boilers, optimizing energy use and system stability.
High pressure cleaning/wash down facilities - Providing the necessary force for thorough, efficient cleaning in industrial and commercial settings.
Jacking pumps for fire hydrant systems - Essential for rapid deployment of firefighting resources, ensuring safety and compliance.
Irrigation and fire hose feel supply - Delivering dependable water flow for agricultural and firefighting applications.
Showers - Ensuring a luxurious and consistent water experience in residential and commercial showers.
Co generation - Enhancing the efficiency of energy systems by supporting the simultaneous production of electricity and useful heat.
Spray - Used in various applications requiring precise and controlled spraying performance.
Pressure Boosting - Elevating water pressure to superior levels for diverse applications, guaranteeing satisfaction and reliability.

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.