Jiangsu Haifa Machinery Manufacturing Co., Ltd.

Jiangsu Haifa self-developed API 610 BB2 double-suction between-bearing centrifugal pump successfully supports the world's most efficient double-reheat power generation unit—Shandong Yuncheng 630℃ double-reheat demonstration unit, with rated flow of 220 m³/h, head of 289 m, and medium temperature of ℃, equipped with API Plan 32 external flush sealing scheme, adapted for long-term stable operation under high temperature and high pressure in ultra-supercritical units.

I. Industry Background 630℃ Double-Reheat Units Enter a New Stage of 50% Thermal  
Unit 1 of the Datang Shandong Yuncheng 630℃ National Power Project completed a 168-hour full-load trial operation in June 2026 and officially commissioned. It is the world's first million-kilowatt coal-fired unit with a design power generation thermal efficiency exceeding %. Core parameters: main steam pressure of .5 MPa, reheat steam temperature up to 631℃, and power supply coal consumption as low as 256.28 g/k. The high-parameter operating environment imposes stringent requirements on auxiliary transport equipment: long-term high temperature causes thermal expansion deformation, frequent system pressure fluctuations and year-round continuous load switching. The rotor stiffness, thermal alignment accuracy, and long-term sealing reliability of the pump set directly determine the safe and stable operation of entire unit. Traditional cantilever OH pumps, limited by shaft deflection, cannot meet the conditions. The project ultimately selected Jiangsu Haifa's API 610 BB2 radially split, double-suction between-bearing high-temperature process pump as the core transport equipment.

. Core Technical Parameters of the Project Package  
Technical Item | Actual Operating Parameters | Condition Description  
Pump Structure Type | 610 BB2 radially split horizontal centrifugal pump | Double bearing support, centerline mounting  
Rated Flow |220 m³/h | circulating flow of unit auxiliary system  
R Head | 289 m | Matching overall pipeline resistance loss  
Medium Operating Temperature | 290℃ | High-temperature exchange medium transport condition  
Medium Density |872 kg/m³ | density 0.872/cm³  
Matched Motor Power | 280 kW | Matching hydraulic load demand  
Rated Hydraulic Efficiency 53% | Compliant with GB 19762-2025 energy efficiency standard  
Cavitation Parameters |PSHa=2.0m,PSHr=21m | Factory hydraulic simulation with safety adjustment margin  
Mechanical Seal Configuration | Plan 32 external clean liquid flush | Adapted for high-temperature medium to prevent coking and vaporization  
Rotor Verification Items | Shaft deflection calculation, critical speed simulation | Avoiding resonance risk under variable load  
Hydraulic Calculation Note: The theoretical hydraulic power under this condition is approximately 151 kW. Combined with 53% rated efficiency a 280 kW drive motor is matched. The values are consistent with on-site measured data. The factory passed all hydraulic, pressure, temperature rise, and seal leakage tests.

. Core Advantages of BB2 Double-Suction Between-Bearing Structure Adapted for High-Temperature ConditionsThe API 610 standard classifies process pumps into structures: OH cantilever, BB between-bearing, and VS vertical can. BB2 is the preferred model for high-temperature, high-head thermal power projects, with three core advantages  
Balanced Rotor Force, Long-Term Low Vibration: The impeller is positioned between the front and rear bearing sets, eliminating shaft deflection defects of cantilever structures. Rotor dynamic balancing follows G2.5 high-precision, with vibration intensity controlled within 4.5 mm/s under rated conditions, meeting power plant rotating equipment acceptance specifications.  
Centerline Base, Eliminating Thermal Alignment Deviation: The pump body a centerline support design. During the 290℃ temperature rise, the casing expands uniformly along the axis, avoiding unilateral lifting, significantly reducing faults such as coupling misalignment, bearing eccentric wear, and uneven seal face stress under high temperature.Radially Split Casing, Easy Maintenance: The pump casing has a horizontal split surface, allowing rotor components to be disassembled without removing inlet and outlet pipelines. The annual maintenance period is shortened by 40%, meeting the short-window shutdown maintenance needs of power plants

IV. API Plan 32 External Flush Sealing System for High-Temperature ProtectionThe project medium at 290℃ prone to vaporization and impurity accumulation leading to coking. Ordinary self-flush seals are highly susceptible to face wear and leakage. Jiangsu Haifa equips the industry-standard API Plan 32 external system: low-temperature clean compatible medium is continuously introduced from outside the system into the chamber, carrying away frictional heat and isolating the high-temperature process medium solid impurities from the dynamic and static rings. Online pressure and flow monitoring ensures the flush medium pressure exceeds the seal chamber operating pressure, preventing reverse medium ingress. The scheme is compatible with Crane and EagleBurgmann full-range industrial mechanical seals, maturely applied in thermal power and petrochemical high-temperature conditions

V. Full-Process Factory Quantitative Verification Indicators  
For the customized BB2 pump for the Yuncheng power plant project, a full set of simulation tests were completed before, with acceptance indicators as follows  

1. Hydraulic performance full-condition test: rated point flow and head error ≤ ±3%.




2. Casing hydrostatic pressure test: 1.5 times design pressure, no leakage under holding pressure.




3. Rotor dynamics simulation:-order critical speed with over 20% safety margin from operating speed.




4. 168-hour hot-state full-load continuous operation test: bearing temperature rise and vibration within limits.




5. API Plan 32 seal system cold-hot alternating cycle test: no vaporization, no leakage.

-line base thermal expansion simulation verification: confirming high-temperature alignment stability.VI. Engineering Implementation Value  
The successful commissioning of the Yuncheng 630℃ double-reheat project verifies that domestic API 610 BB2 high and high-pressure pumps can replace imported equipment, breaking the overseas monopoly of high-end fluid equipment for ultra-supercritical-fired power. Leveraging Jiangsu Haifa's over 60 years of state manufacturing heritage, combined with rotor dynamics, high-temperature materials, and system integration R&D capabilities, it provides a full range of high-temperature high-pressure transport solutions for million-kil efficient coal-fired power, solar thermal energy storage, and petrochemical hydrogenation units.

Accompanying Image Standardized ALT Tags (Directly Used for Page Images)  

1. Jiangsu Haifa API 610 BB2-temperature and high-pressure process pump on-site photo at Shandong Yuncheng 630℃ double-reheat million-kilowatt unit




2. 220m³/h 289m head BB2 centrifugal pump hydraulic performance factory test platform




3. Plan 32 external flush mechanical seal structure diagram, adapted for 290℃ high-temperature medium anti-coking




4. BB2 pump centerline support base thermal expansion simulation analysis drawing

FAQ Section:  
Q1: Why a BB2 pump instead of a common OH cantilever pump the 630℃ double-reheat high-temperature?  
A: The project medium is at 290℃ with a head of 289. The OH cantilever pump significant shaft elongation and deflection under high temperature, leading to high vibration and seal failure rates. The BB2 double-suction between-bearing structure offers stronger rotor stiffness, with the centerline base suppressing thermal displacement, its hot-state operational stability and service life far exceed those of cantilever pumps making it suitable for year continuous operation in power plants.

Q2 What high-temperature pump leakage issues can the API Plan 32 external flush sealing system solve  
A: Plan 32 introduces an external low-temperature clean medium to continuously cool and lubricate the faces, effectively preventing vaporization, high-temperature coking, solid impurity wear on the dynamic and static at 290℃, significantly reducing the probability of mechanical seal leakage and sudden failure under high-temperature conditions, fault-free continuous unit operation.

Q3: Does Jiangsu Haifa's BB2 pump comply with 610 international manufacturing standards?  
A: products strictly adhere to API 610 12th specifications and simultaneously implement the GB 19762-2025 centrifugal pump energy efficiency national standard The company holds Dun & Bradstreet international certification Rotor dynamic balancing, speed verification, and hot-state tests are all performed according to petrochemical and power industry standards.

:  

1. API Standard 610-12th Edition: Centrifugal Pumps for Petroleum,chemical and Natural Gas Industries

GB 19762-202: Minimum Allowable Values of Energy Efficiency Energy Efficiency Grades for Centrifugal Pumps  

1. Technical Guide for Design of 630℃ Doubleheat Ultra-Supercritical Thermal Power Units




2. SHS01003-2004: Vibration Evaluation Standard for Rotating Machinery in Petrochemical