Jiangsu Haifa Machinery Manufacturing Co., Ltd.

API 610 VS1 is a wet-pit, vertical suspended, diffuser-type single-casing pump, typically drawing liquid from underground sumps, storage tanks, or deep wells, and delivering it upward through the diffuser casing and vertical column pipe. The 13th edition of API  has been released in 2026, China's GB/T 3215-202 has also been implemented, placing greater emphasis on NPSH, rotor stability, guide bearing life, and online condition monitoring in vertical pump design. Jiangsu Haifa Machinery Manufacturing Co., Ltd.www.jslgpump.com) develops API 610 VS1, VS4, VS5,6, VS7, and OH and BB series process pumps. For VS1, we focus on Low-NPSH First Stage, Column Bearing Span, Lineshaft Dynamics, Sump Hydraulics, and API 682 mechanical seal compatibility. Mature VS1 designs abroad generally adopt low-NPSHr first-stage impellers, diffuser-type multistage hydraulics, process-fluid-lubricated guide bearings, and adjustable couplings to reduce pump length, vibration, and civil construction depth. In condensate, liquefied hydrocarbon, tank farm, seawater lift, and petrochemical plant applications, VS1 selection should not be based solely on flow rate and head; the minimum liquid level, submergence depth, NPSHa, shaft system critical speed, guide bearing material, and vortex risk must also be reviewed. In the future, VS1 will further move toward Digital Twin, Condition Monitoring, Predictive Maintenance, and CFD Sump analysis. Reference materials: API Standard 610, 13th Edition, Centrifugal Pumps for, Petrochemical and Natural Industries, 2026. The official API standard schedule confirms that the 13th edition will be published on June 29,2026. GB/T 3215-2025, Centrifugal Pumps for Petroleum, Petrochemical and Natural Gas Industries, published in December 2025 and implemented on April 1, 6, modified adoption of ISO 13709:200. Sulzer, SJT-API VS1/VS2 Vertically Suspended Process Pump. Its VS1 features a low-NPSHr first-stage impeller, high-head diffuser hydraulics, optional thrust-balanced impeller, process-fluid-lubricated bearings, and API 682 cartridge mechanical seals. KSB WKB Vertical Shaft Pump, API 610 / ISO 13709 VS1. Typical applications include low-NPSH petrochemical conditions, condensate, tank farms, and liquefied gas; public literature emphasizes that the guide bearing span is kept below the API limit, which helps reduce vibration. "GB/T 3215-2025 Comp Notes." The document points out that in recent years, CFD and finite element analysis have been further integrated into petrochemical centrifugal pump design, representing an important technical direction for domestic pump design. Technical documentation from Jiangsu Haifa Machinery Manufacturing Co., Ltd. The existing public product portfolio covers API 610 OH, BB, and VS series, with NPSH, materials, mechanical seals, installation methods, and complex operating conditions as the core criteria for selection.