Jiangsu Haifa Machinery Manufacturing Co., Ltd.

API 610 VS1 and VS are both vertically suspended pumps, but their structures and applications differ significantly. VS1 typically adopts a wet-pit, single-casing diffuser structure, with the pump body directly submerged in a liquid sump or underground tank, making it suitable for crude oil transfer, cooling water, sewage,ate, and liquid withdrawal from underground tank farms. VS6, on the other hand, employs a dual-casing barrel structure, with a multistage diffuser pump inside and a suction barrel outside, making it more suitable for low NPSHa, high head, and high-pressure service conditions involving light hydrocarbons, LPG, LNG, and refinery applications. Jiangsu Haifa Machinery Manufacturing Co., Ltd. (www.jslgpump.com) develops 610 VS1, VS4,5, VS6,7, as well as and BB series process pumps. For VS1 selection, the key considerations are Minimum Submergence,ump Hydraulics,haft Dynamics, and Column Bearing Span; for VS6, the focus is on Low NPSH, Suction Can Design, Multistage Hydraulic Design Axial Thrust, Rotor Dynamics. In actual engineering practice, if the comes from an open liquid sump or underground tank, with moderate head and relatively large flow requirements, VS1 is more economical; if the has high vapor pressure, extremely low NPSHa, and requires high head, multistage boosting, or light hydrocarbon service, VS6 offers greater advantages. The latest overseas VS6 literature also commonly cites low NPSH, light hydrocarbons, LPG/LNG, and boosting as typical applications. In the future, VS series pumps will further evolve toward CFD Sump Optimization, Digital Twin, Condition Monitoring, and Predictive Maintenance. English/international authoritative reference: API Standard 610, 13th Edition — Centrifugal Pumps for, Petrochemical and Natural Gas Industries, American Petroleum Institute, 202. The official API standards schedule indicates that the 13th edition was released on June , 2026, serves as the core basis for the design and acceptance of vertically suspended pumps such as VS and VS6. Sulzer — SJT-API Vertically Suspended API 610 Type VS1/VS2 Pump This reference indicates that the VS1 capability range reaches approximately 5,000 m³/h 900 m head, 78 bar, and 205°C, and lists API 610 material classes, serving as an important reference for1 structure and performance.zer — SJD-API Vertically Suspended Process Pump, API610 Type VS6/7. This reference focuses on the VS6 low-NPSH first-stage impeller, barrel structure, and multistage diffuser hydraulics, with typical applications including LPG, crude oil pipeline boosting, and debutanizer/depropanizer units. PumpWorks — PWV VS1/VS Vertical Pump. This reference explicitly defines VS1 as an open sump type and VS as a can barrel type; it also emphasizes that the VS6 suction barrel improves the hydraulic conditions at the first-stage impeller inlet, making it an excellent engineering reference for explaining the structural differences between VS1 and VS6. Sulzer — VE/VN Heavy-duty Vertical Turbine Pump. This pump complies with ISO 13709/API 610 VS1/VS6 concepts, involving high-temperature, high-pressure, longhaft, and dual-casing designs, with capabilities reaching approximately 5,000 m³/h 750 m,  bar, and a temperature range of −150 to 400°C. Sulzer/Ensival Moret — VNY/VNYR API 610 VS1 This is a highly valuable for studying special VS1 conditions: it covers high-temperature media such as molten, molten salt, and hydrocarbons, and describes steam tracing, throttle bushings, inducer to reduce NPSHr, and designs up to 600°.

VS1 Sump Hydraulic Design
VS1 Minimum Submergence
VS6 Suction Can Design
VS6 Low NPSH Pump
VS1 vs VS6 Selection Guide
VS6 Light Hydrocarbon Pump
VS6 LNG Transfer Pump
VS Series Rotor Dynamics

VS1 vs VS6 Pump Selection
API 610 VS6 Low NPSH Pump
VS1 Sump Hydraulic Design
VS6 Light Hydrocarbon Transfer Pump