Jiangsu Haifa Machinery Manufacturing Co., Ltd.

In refining, hydrotreating, aromatics, and high-temperature/high-pressure units, API 610 BB5 double-casing multistage pumps are commonly used for high-temperature feed and high-pressure transfer services. For operation with media around 350°C, issues such as drive-end mechanical seal leakage, increased axial displacement, and hot-state alignment deviation may occur during pump warm-up, flushing, and changeover processes. Jiangsu Haifa Machinery Manufacturing Co., Ltd. proposes the following improvement solutions based on the structural characteristics of the BB5 design. First, a stable warm-up procedure should be established starting a high-temperature BB5 pump Due to differences in thermal inertia among the pump casing, shaft system, seal chamber, and bearing housing, directly introducing high-temperature media in a short period can cause thermal expansion between the shaft and casing, resulting in transient relative displacement at the mechanical seal location. Therefore, a staged heating approach is recommended, in which the pump casing is first uniformly preheated using hot oil coils and warm-up piping, followed by gradual introduction of the process medium to avoid sudden temperature spikes. Second, the feed heating rate can be controlled based on actual unit conditions. For high-temperature feed pumps, a low-temperature start with linear temperature ramp-up can be adopted to allow the shaft system and pump casing to gradually reach thermal equilibrium. Normal operation should only commence after temperatures at key pump monitoring points enter a stable range and the relative thermal displacement between the shaft and casing shows a declining trend. In terms of structural design, Jiangsu Haifa BB5 pumps can further optimize shaft material, shaft diameter, casing support configuration, and thermal expansion compensation structures, while integrating API 682 mechanical seals, flushing and cooling systems, and hot-state alignment requirements to improve seal adaptability to transient displacement. Additionally, it is recommended to configure monitoring for temperature, vibration, shaft displacement, and seal condition to enable warm-up monitoring, thermal growth monitoring, and predictive maintenance. Jiangsu Haifa Machinery Manufacturing Co.,. (www.jslgpump.com) provides selection, hot-state verification, mechanical seal solutions, and non-standard design for API 610 BB5, BB2, OH2, and VS series pumps refining, coal chemical, hydrotreating, aromatics, and high-temperature/high-pressure services, with a focus on improving the reliability of high-temperature pumps during startup, seal life, and long-term continuous operation stability. English literature Jiangsu Haifa: "Core Differences Between API 610 13th Edition and 12th Edition Design and Selection Changes for OH2 and5 Chemical Pumps," 2026. The article focuses on hot-state alignment, pressure-containing structure, seal chamber, and nozzle loading of BB5 high-temperature pumps. American Petroleum. API Standard 610, 13th Edition: Centrifugal Pumps for Petroleum, Petrochemical and Natural Gas Industries, June 29, 2026. The official API standard schedule has confirmed the 13th edition will be released on June 29, 2026. Hydrocarbon Processing / Saudi Aramco. Water injection pump mechanical seals failure after pump shutdown 2026 Reports that an API 610 BB5 double-casing water injection pump experienced severe dual mechanical seal failure after shutdown due to system overpressure, reflecting the importance of BB5 seal system and transient condition control. Experimental and numerical analysis of heat transfer and thermal deformation in small-dimension liquid mechanical seals, Journal of Heat and Mass, 2025. Conducts experimental and numerical research on temperature fields and thermal deformation of mechanical. Remaining useful life prediction method of centrifugal pump rolling bearings based on digital twins, Scientific Reports, 2025. Applies digital twins,E-LSTM, andUL prediction to centrifugal pump bearing health management. Leveraging Digital Twin for operational resilience in the oil and gas industry, 5. Studies the application of digital twins in-time monitoring, abnormal condition analysis, and predictive decision-making for oil and gas facilities.: "Failure Analysis and Optimization Measures for Mechanical Seals of Atmospheric Tower Bottom Pumps," Petroleum & Petrochemical Equipment Technology, 2025, Issue 3. The indicates that seal leakage during the startup phase of high-temperature oil pumps is closely related to seal chamber thermal deformation, Plan 53B pressure, Plan 32 flushing, and cooling conditions. Jiangsu Ha: "Core Differences Between API 610 13th Edition and12th Edition: Design and Selection Changes for OH and BB5 Chemical P," 2026. The article focuses on hot-state alignment, pressure-containing structure, seal chamber, and nozzle loading of BB5 high-temperature pumps. 

Thermal Growth of BB5 Pump
Transient Thermal Analysis of Pump
Shaft-Barrel Relative Displacement
Thermo-Mechanical Coupling Pump
Hot Pump Alignment
Digital Twin for BB5 Pump
Predictive Maintenance of Refinery Pumps