API610 BB3 pump  “Between-Bearing,horizontally axially split casing pump 

horizontal mid-open multi-stage pumps comply with the latest version of API 610 (ISO13709) BB3 structure. They are axially divided and supported multi-stage pumps at both ends. They are mainly used to transport clean or liquids containing solid particles, such as petroleum extraction, petrochemical industry, chemical industry, coal chemical industry, pipeline transportation, seawater desalination, power plant boiler water supply, etc., Can also be used in high-pressure hydraulic energy recovery turbines in the chemical industry, lean liquid pumps and liquid-rich pumps in fertilizer and ammonia synthesis plants.

Core performance parameters

The maximum flow rate can reach 3200 m ³/h (14000 USgpm)
The maximum lift can reach 2900 m (9500 ft)
The maximum working pressure can reach 300 bar (4400 psi)
The maximum working temperature can reach 200 ° C (400 ° F)
Export size 150 to 350 millimeters (3 to 14 inches)
Maximum speed up to 6000 revolutions per minute

Product features

Our Advantages

1. Housing: Axially divided, supported near the centerline, the pump inlet and outlet flanges are arranged on the pump body, which can easily realize the inspection and maintenance of the pump without moving the inlet and outlet pipelines, simplifying rotor balance, inspection and installation, pump body flow channel inspection and modification, and the transformation of spare parts rotors.

2. Impeller: precision casting, dynamic balance and individual impellers are fixed separately, the impellers are interference fit, and the stepped shaft structure is used at each stage of the impeller to facilitate installation and maintenance; DN80 (export) and above specifications can be equipped with the first-stage double-suction impeller to improve the anti-cavitation ability NPSH.

3. Balance of axial force and radial force: the impeller is arranged symmetrically back to back to self-balance the axial force, the intermediate bushing and the throat bushing balance the residual axial force, and the thrust bearing only bears the lower load; the volute is arranged symmetrically up and down, with the smallest radial force, in order to obtain a smaller shaft deformation and bearing load.

4. Bearings and lubrication: Bearings choose oil ring self-lubricating structural bearings or forced lubricating structural bearings according to the size of shaft power and speed. The full range adopts bearing isolator type seals, carbon steel bearing boxes, and bearing boxes can be fan-cooled or water-cooled for selection.

5. Shaft seal: The sealing system implements the 4th edition of API682 "Centrifugal Pump and Rotary Pump Sealing System", which can be configured with various forms of sealing, flushing and cooling schemes.

Capacity

Model description

LCD 800-150×6

LCD: Axial split, multistage two-end supported pump.
800: Rated flow 800m3/h
150: Single stage head 150m
6: Stage qty
 

Structure diagram

Performance curves

1. Shell: axially split and supported near the center line. The pump inlet and outlet flanges are arranged on the pump body. The inspection and maintenance of the pump can be easily realized without moving the inlet and outlet pipelines, and the rotor balance and inspection are simplified. and installation, inspection and modification of pump body flow channels, and modification of spare parts rotors.

2. Impeller: precision casting, dynamic balancing and individual fixing of each impeller. The impeller is an interference fit, and each stage impeller adopts a stepped shaft structure for easy installation and maintenance; DN80 (outlet) and above specifications can be equipped with first-stage double suction Impeller to improve cavitation resistance NPSH.

3. Axial force and radial force balance: The impellers are arranged back-to-back symmetrically to self-balance the axial force. The intermediate bushing and throat bushing balance the residual axial force. The thrust bearing only bears a low load; the volute is symmetrical up and down. Arrangement designed for minimum radial forces to obtain smaller shaft deformations and bearing loads.

4. Bearings and lubrication: The bearings use oil ring self-lubricating structure bearings or forced lubrication structure bearings according to the shaft power and speed. The whole series adopts bearing isolator type seals and carbon steel bearing boxes. The bearing boxes can be fan-cooled or water-cooled. Cooling available.

5. Shaft seal: The sealing system implements the 4th edition of API682 "Centrifugal Pump and Rotary Pump Sealing System" and can be configured with various forms of sealing, flushing, and cooling solutions.

The full name of BB3 is "Between Bearing, Axially Split, Two Casing, Radially Impelled", which means two end support, axial splitting, double-layer shell, radial impeller pump. You can understand it as a "drum bag double shell pump".

The core design philosophy is to ensure the integrity and sealing of the pressure bearing shell to the greatest extent possible, while facilitating the maintenance of internal components. The specific structural decomposition is as follows:

The core product of BB3 pump is the MSD series horizontally split multi-stage pump with mature technology. It is designed strictly in accordance with API 610 (ISO 13709) standards and is renowned for its long-term stable operation under harsh conditions of high pressure and high head. It has been installed and applied in over 10000 units worldwide.

💡  Core design concept
Sturdy and reliable: Adopting a horizontal open shell, this means that the pump cover can be directly opened for inspection or replacement of internal components such as rotors without dismantling the inlet and outlet pipelines, greatly facilitating on-site maintenance.

Balance and efficiency: Through the back-to-back arrangement of impellers, the huge axial thrust generated during operation is cleverly balanced, reducing bearing load. At the same time, its hydraulic performance covers a wide range, ensuring that the pump operates in the high-efficiency zone.

Coping with harsh working conditions: The design target lifespan is 20 years, with an availability rate of over 98%, specifically designed for critical processes that require long-term continuous operation and do not allow downtime.

📊  Key technical parameters
The following is a summary of the core technical parameters of Sulzer MSD series (BB3 type) pumps:

Supplementary Explanation of Typical Range/Values for Parameter Projects
The maximum flow rate can reach 3200 m ³/h (14000 US gpm)
The maximum lift can reach 2900 m (9500 ft)
The maximum pressure can reach 300 bar (4400 psi)
The maximum applicable temperature is 205 ° C/400 ° F, and some data shows an upper limit of 200 ° C
Export size 150 mm to 350 mm (3 to 14 inches)
The maximum speed can reach 6000 rpm
Flange pressure rating 600 #, 900 #, 1500 # (pound level) can be selected according to project requirements
The level can be customized according to the requirements (such as 8 levels). In actual cases, there are configurations for 8 levels
🛠️  Typical application scenarios
MSD pumps are widely used in the following fields due to their excellent high-pressure performance:

Oil and natural gas: long-distance pipelines, LPG pipelines, crude oil transportation.

Power industry: boiler feedwater systems for thermal power plants and nuclear power plants.

Energy extraction: Oilfield water injection and CO2 injection to improve recovery efficiency.

Water treatment: seawater desalination, reverse osmosis, high-pressure water supply, mine drainage.

🔧  Key structures and materials
Pump body and impeller: The first stage impeller usually adopts a double suction form, which can effectively reduce cavitation allowance and improve suction performance. The subsequent impeller is a single suction type, which jointly generates high pressure.

Material options: The material selection is flexible to meet the corrosion and wear requirements of different media. For example, the pump body can be made of carbon steel, low-alloy steel, or duplex stainless steel; The impeller and shaft are often made of high-strength stainless steel and equipped with replaceable shaft sleeves to protect the main shaft.

Bearings and seals: Equipped with heavy-duty sleeve bearings or tilting pad bearings to ensure the stability of the rotor at high speeds. The sealing system fully complies with API standards and can integrate various flushing and sealing solutions.

Are you selecting for a specific project, such as boiler feedwater or pipeline transportation? If you can provide the flow rate, head, and medium type, I can help you determine whether the MSD pump is suitable, or compare the differences between other pump types such as BB5.

Mainly used in petroleum exploitation, petrochemical, chemical,
Coal chemical industry, pipeline transportation, seawater desalination, power plants, etc
Can also be used in coal chemical  pump, poor methanol transport pump,
High pressure hydraulic energy recovery turbine, fertilizer,
Lean liquid pump and rich liquid pump of synthetic ammonia plant, etc
Typical working conditions are used in power plant boiler feed water, steel coking and phosphorus removal, oil field water injection, offshore platforms and other high-pressure occasions.

Flow rate: ~2500m³/h
Head: ~1200m
Speed: 2950-3600r/min
Design pressure: ~25MPa
Operating temperature: -80ºC~200ºC

Structural characteristics and composition
1. Double layered shell and outer cylinder: a cylindrical pressure vessel that is forged or forged as a whole, with end caps closed at both ends. This is the main pressure bearing component, capable of withstanding all system pressures without any axial split flanges, thus eliminating the risk of high-pressure leakage.
Internal pump core: including all flow components such as impeller, guide vanes, pump cover, etc., installed as a complete withdrawable component inside the outer cylinder.
2. Axial dissection and "core package" • Maintenance advantages: During maintenance, only the end caps at both ends need to be opened to extract the entire "pump core" or "core package" from one end in the axial direction, without disassembling the inlet and outlet pipelines or motors, making maintenance extremely convenient and fast.
3. Support and bearings • Two end support: The pump shaft is supported by independent bearing boxes located at both ends of the pump, which has excellent operational stability and is suitable for high speed and high power.
Heavy duty bearings: using a combination of high load-bearing radial bearings and thrust bearings.
4. Sealing system • Typically equipped with high-performance double end mechanical sealing systems that comply with API 682 standards, used to seal high-pressure media inside the pump.
🏭  The main application industries and working conditions of BB3 pump
BB3 pump is specially used for the most critical and demanding high-pressure, high-temperature, and high-risk conditions in the process industry due to its extremely high pressure bearing capacity, excellent operational reliability, and convenient maintenance.

Why is it necessary to use BB3 pump for typical working conditions and sections in the application industry?
High pressure feed pump for petroleum refining, hydrocracking, and refining units
High pressure boiler feed pump (although BB5 is commonly used, BB3 is also applicable)
High pressure liquid delivery pump safety: The integral outer cylinder can safely withstand system pressures of up to 20MPa or higher, without the risk of large flange leaks.
Thermal shock resistance: The double-layer shell design can effectively cope with severe temperature changes and prevent thermal stress deformation.
Quench oil pump and quench water pump for petrochemical ethylene plant
• Ultra high pressure reactor feed pump for polyethylene/polypropylene plant
The reliability of the high-pressure liquid pump in the aromatics complex: Its design ensures trouble free operation time in critical sections that have been running continuously for several years.
Maintainability: In the event of a malfunction, the "core package" can be quickly removed for replacement, greatly reducing downtime.
Wear resistance of high-pressure differential pressure liquid pumps for coal chemical, coal liquefaction, and coal hydrogen production facilities: can be designed for high-pressure media containing small amounts of solid particles.
Other process industries • Water injection pumps for offshore platforms
The high-temperature hot water pump for geothermal applications operates under harsh conditions, taking into account various extreme conditions such as high pressure, high temperature, and corrosiveness.

Selection and Comparison
When BB3 must be selected: When the system pressure is extremely high (usually exceeding Class 600 #), or the medium is extremely dangerous (high temperature, high pressure, flammable, explosive, toxic), and requires online rapid maintenance and zero leakage risk, BB3 is the best choice.

Comparison of main alternative solutions:

BB1 (Axial Split Horizontal Pump): Used for medium and low pressure conditions. There is a large open flange that poses a risk of leakage under high pressure, and maintenance requires dismantling the pipeline.

BB2 (Radial Split Multi stage Pump): Used for high head but not extremely high pressure conditions (such as boiler feedwater pumps). Maintenance is more complex than BB3.

BB5 (Radial Split Double Shell Pump): Similar to BB3, it is also a double shell pump, but it is radially split. Suitable for working conditions of ultra-high pressure and ultra-high head (such as oilfield water injection pumps and reverse osmosis seawater desalination high-pressure pumps), but maintenance requires opening heavy shell bolts, which is not as fast as BB3 core pulling kit.

Conclusion: API 610 BB3 pump is a key equipment in the heart of process industry. It represents the highest balance of safety, reliability, and maintainability. Its high initial cost becomes completely reasonable and necessary in ensuring the safety of the entire factory and avoiding the huge losses caused by unplanned shutdowns.

The MSD series is a double shell, horizontally split multi-stage centrifugal pump designed according to API 610 (ISO 13709) standards. It is designed for harsh working conditions that require continuous operation under high pressure and high flow.

Below is a detailed breakdown of its structural characteristics and application industries.

🔧  Core structural characteristics
The structural design of BB3 pump reflects considerations for high pressure safety, stable operation, and convenient maintenance in every aspect:

Designed according to international standards: strictly following the API 610 (ISO 13709) standard design, ensuring the reliability and long service life of the equipment under harsh working conditions.

Double shell structure: Adopting a double shell design, the pump body includes an internal cylinder and an external pressure bearing shell. This structure can withstand higher system pressure and effectively prevent leakage of high-risk media, with high safety.

Horizontal split design: The pump casing is divided horizontally for easy disassembly. During maintenance, there is no need to move the inlet and outlet pipelines and motors, and the pump cover can be quickly disassembled for inspection or replacement of rotor components, greatly reducing maintenance time.

Optimized hydraulic and balance design:

Symmetrical impeller balancing axial force: By symmetrically arranging the impeller, the huge axial thrust generated during operation can be effectively balanced, which can save lubrication system costs in most applications.

Double suction first stage impeller: In large pumps, the first stage impeller adopts a double suction design, which can effectively reduce the NPSH and prevent pump damage due to cavitation.

Industry leading hydraulic performance: Its hydraulic model has been widely validated to ensure that the pump remains efficient throughout its entire operating range.

🏭  Main application industries
Thanks to its high pressure, efficiency, and reliability, Sulzer BB3 pumps are widely used in the following key industrial fields:

Oil and natural gas: This is one of the main application areas for BB3 pumps. More than 10000 MSD pumps have been installed in such situations worldwide. Specifically, it includes:

Oil pipeline: provides power for long-distance pipeline transportation of crude oil.

Oilfield water injection: used to increase oil recovery (EOR) by injecting high-pressure water into the reservoir.

Flow safety guarantee: used in deep-sea oil fields for dead oil circulation or hot oil circulation, to prevent pipeline blockage at low temperatures and ensure smooth production.

Petrochemical and Refining:

Boiler feed pump: In refineries and chemical plants, it serves as a boiler feed pump to continuously supply water to high-pressure steam boilers. A case study from an Argentine refinery shows that a Sulzer BB3 pump, which has been in service for over 40 years, can still return to service after professional repairs by Sulzer, demonstrating the durability and maintainability of its design.

Energy and Electricity:

Nuclear power services: Their reliability can even meet the safety related service requirements of nuclear power plants.

Conventional electricity: used for boiler feedwater systems in thermal power plants.

Offshore production platform:

Seawater treatment: When higher pressure is required for seawater desalination treatment (such as reverse osmosis) on floating production storage and offloading units (FPSOs) and fixed platforms, BB3 pump is an ideal choice.

The stability and ease of maintenance of this pump are important reasons for its widespread application. If you are working on specific project selection or want to know the main differences between it and similar BB5 (drum bag pump) in application, feel free to let me know and I will conduct targeted analysis for you.
Flowserve's pumps that comply with API 610 BB3 standards are its DMX series (as well as derivative models such as DMXH for specific high pressures and DMX-RO for seawater desalination). Similar to the design concept of Sulzer BB3, the DMX series is also a main equipment designed for high reliability, high pressure, and high flow conditions.

Below is a detailed breakdown of its structural characteristics and application industries.

🔧  Core structural characteristics
The structural design of Flowserve DMX pumps also revolves around the core values of high pressure safety, stable operation, and convenient maintenance:

Compliant with international standards: Designed strictly in accordance with API 610 (ISO 13709) BB3 standards to ensure the reliability of equipment under harsh operating conditions.

Single shell, horizontal split design: The pump casing is divided horizontally, and the suction and discharge nozzles are cast together with the lower half. This means that during maintenance, there is no need to move the inlet and outlet pipelines, and the pump cover can be removed for inspection or rotor replacement, making maintenance very convenient.

Optimized hydraulic and balance design:

Double volute structure: Adopting a double volute design, it effectively balances the radial force generated by the pump during operation in a wide flow range, reducing vibration.

Back to back impeller arrangement: By symmetrically (back-to-back) arranging the impellers, most of the axial forces are automatically balanced, thereby extending the bearing life.

Optional dual suction first stage impeller: To meet different NPSH requirements, the first stage impeller can be designed with large eye single suction or dual suction to prevent cavitation.

Robust rotor and bearing system: The rotor is assembled on a large-diameter shaft, and the bearing span is minimized to minimize shaft deflection under non peak operating conditions. Simultaneously providing multiple bearing configuration options (such as ball bearings, sleeve bearings, Kingsbury tilting tile thrust bearings) to adapt to different load and operating requirements.

Materials suitable for harsh working conditions: Multiple material options are available, including carbon steel, 12% chromium steel, austenitic and duplex stainless steel, and even Monel alloy, to cope with corrosive or aggressive media.

📊  Main performance parameters
The performance coverage of Flowserve DMX series pumps is very wide, and the following are their core operating parameters:

Supplementary Explanation of Performance Project Parameter Range (DMX Series)
The maximum flow rate can reach 5678 m ³/h (25000 gpm) with a wide coverage range, which can meet the needs of different scales. There are also data showing 2950 m ³/h, which may correspond to different models.
The multi-stage impeller design with a maximum head of 2712 m (8900 ft) can achieve extremely high conveying pressure. There is also information showing it as 2130 meters, which may correspond to different models.
The maximum working pressure can reach 275 bar (4000 psi), and the single shell design is very mature and reliable at this pressure level.
The working temperature can reach up to 204 ° C (400 ° F), suitable for industrial medium transportation in the medium temperature range.
The maximum speed of up to 6000 revolutions per minute is designed for high-speed working conditions and is widely used.
Available in various calibers ranging from 3 to 18 inches, suitable for different piping systems.
🏭  Main application industries
With its high pressure, efficiency, and reliability, Flowserve DMX series pumps are widely used in the following key industrial fields:

Oil and natural gas: This is the core application area of DMX pumps. With a global installed capacity of over 10000 units, it demonstrates its dominant position in the industry.

Specific applications: crude oil, product and CO ₂ pipeline transportation, oilfield water injection/CO ₂ injection (to enhance oil recovery), FPSO (Floating Production Storage and Offloading Unit), oil and gas separation and treatment, etc.

Petrochemical and Refining:

Specific applications: Refining process equipment (such as hydrocracking, hydroprocessing), boiler feedwater, amine liquid transportation, LNG (liquefied natural gas) production, etc. A case study from a crude oil pipeline shows that a 2250 horsepower Flowserve DMX BB3 pump is used to transport crude oil at one of the largest pipeline hubs in the United States.

Energy and Electricity:

Specific applications: Boiler feedwater systems for conventional thermal and nuclear power plants, nuclear island services, etc.

Water resources and seawater desalination:

Specific applications: seawater reverse osmosis (SWRO) high-pressure water supply (with specially optimized DMX-RO models), groundwater development and irrigation, industrial water supply and treatment, etc.

Other industrial sectors:

Specific applications: mining (dehydration, water supply), pulp and paper (boiler feed water), primary metal industry, hydraulic pressurization, etc.

I hope the above information about Flowserve BB3 pump is helpful to you. If you need to conduct selection analysis for specific projects or want to compare with other pump types, feel free to ask me again.