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Special Focus on VGO Pump 3- Technical Innovations

2020-08-08 16:42:00 Chongqing Pump Read


Special Focus on VGO Pump 3- Technical Innovations

On June 12, 2020, VGO Hydrocracking Feed Pump (SDT70-300) produced by CQPI was put into operation successfully with excellent performance, and it broke through many bottleneck technologies of high-end pump manufacturing.


Main parameters and operation conditions as follows:

Parameters of pump are rated flow 65m3 / h, rated head 2,985m, rated speed 6,000 rpm,  and medium is VGO  in temperature of 210 ℃ ~ 260 ℃ ~ 350 ℃including 5% WT metal catalyst particles. The pump adopts radial split double casing barrel structure (BB5). Its core package adopts axial split structure (BB3) with 10-stage impellers arranged symmetrically. The mechanical seal applies plan32 + 54 for sealing and flushing. The pump unit is equipped with gear box and independent lubricating oil system as well as mechanical seal flushing circulating oil system.



Critical highlights in bottleneck technologies:

On the condition of low flow and high head, the pump speed is high but specific speed is very low. The inner casing of pump adopts axial split to realize the maintenance on site and save operation cost, but this construction cause big difficult on casting and machining, and the seal between upper and lower casing under 350℃ is difficult too, which breaks through the existing technology cognition and application of pump industry. 

Ø 在超低流量、超高扬程的工况条件下,多级离心泵采用的转速高,而泵的比转速还非常低;为达到现场可以拆检维修,降低运行成本的目的,内壳体采用了轴向剖分式,导致内壳体的铸造及加工难度极大、上下壳体在350℃下的密封难度也极大,突破了泵行业现有技术的认知和应用。

Due to the medium containing 5% WT metal catalyst particles,  special processing craft, the impeller, the surface hardness of the wetted parts like impeller, seal ring and casing etc. reaches 700HV, and   surface hardening layer thickness reaches 0.6 mm, which is exceed 500HV than hardness of the catalyst particles, and ensure the parts wear resistance and service life.

Ø  由于介质中含有5%WT金属催化剂颗粒,通过特殊的处理工艺,使叶轮、口环、蜗壳等过流件表面硬度达到700HV、表面硬化层厚度达0.6mm,超过催化剂颗粒的500HV硬度,保证了零部件耐磨性及使用寿命。



CQPI is a state-owned company affiliated with Chongqing Machinery & Electronics Holding (Group) Co., Ltd.(CME), specializing in the research, development, design and production of high-end pump and systems. It has two main category products, the positive displacement pump and centrifugal pump. The company established in 1951, and it has sustained profitability and steady development, there are more than 1000 employees, and it covers an area of 200,000m2. Awarded the "national enterprise technology center", passed the assessment of “integrated management system of informatization and industrialization", and awarded “API Q1”. With the platform of "whole-life cycle management and remote operation and maintenance ", the product is widely used in the industry of oil and gas, chemical, mining, metallurgy, steel, nuclear power, thermal power, water supply and drainage etc. in domestic and abroad, and has been exported to more than 30 countries all over the world. 

重庆水泵厂有限责任公司是重庆机电(控股)集团旗下专业从事高端工业泵类产品及系统研究、开发、设计、生产于一体的国有企业,覆盖容积泵及离心泵两大类产品。重泵始建于1951年,持续盈利、稳定发展,现有员工1000余人,工厂占地面积200,000平方米;获得“国家企业技术中心”的授牌、通过国家“信息化和工业化融合管理体系 要求”的评定、拥有“API Q1”证书、携“机泵全生命周期管理及远程运维”平台,广泛服务于国内外油气、化工、矿山、冶金、钢铁、核电、电力、给排水等领域,已出口到全球30多个国家和地区。