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Hydrogenation feed pumps are essential for various hydrogenation units, supplying raw materials under high-pressure conditions. Depending on the process requirements, these pumps can achieve outlet pressures of up to approximately 20 MPa, with a maximum power rating of 5848 kW. The most common type is the BB5 horizontal double-shell multistage centrifugal pump. However, smaller systems may also use OH6 high-speed pumps or reciprocating pumps.
The BB5 pump features two types of housing: cast steel and forged. The inner casing can be either vertically split (with a guide vane pressure chamber) or horizontally split (with a double volute pressure chamber). Among these, the vertical split structure is the most widely used, especially for guide vane pressure chambers. Major manufacturers such as Flowserve (WIK, HD0/HS0), EBARA, Sulzer (GSG), and many domestic producers utilize this design. In most cases, the impellers are arranged in series, with axial forces balanced by a balancing drum, balance disc, or their combination located on the discharge side. Typically, about 90% to 95% of the axial force is balanced, leaving a small residual amount handled by thrust bearings. Some designs, like the Willpower AHPB, Sulzer GSG, and Clyde joint Db36, use a back-to-back impeller arrangement to further reduce axial forces.
Today's latest valid order information is available upon request. Free access to morning buyer data is also offered. Don't miss out—grab your chance now! While there are fewer pump brands using horizontally split inner housings, companies like Flowserve (HDB/HSB), EBARA (formerly Byron Jackson), and Sulzer (CP type) do offer such models. These pumps feature a double volute pressure chamber and back-to-back impeller configuration.
Each inner casing design has its own advantages and limitations. The vertical split structure has a smaller bore, making it easier to manufacture, and generates less axial force from the rotor, which enhances rotor stability. On the other hand, the horizontally split structure offers easier installation and allows the rotor to undergo full dynamic balancing. However, after installation, the guide vane pressure chamber requires reassembly, which demands higher precision in component balancing. Additionally, the shorter axial length of series-arranged impellers improves shaft rigidity, while back-to-back arrangements help balance axial forces but increase the shaft length, potentially reducing its stiffness.