Overview
Cryogenic pipeline pumps are engineered to handle ultra-low-temperature fluids in closed piping systems, commonly used in LNG terminals, aerospace, and chemical processing plants. Unlike standard pumps, they incorporate specialized materials and insulation to prevent brittleness and heat transfer. Their hermetically sealed design minimizes fluid loss and ensures operational safety in extreme conditions. These pumps are classified into centrifugal and reciprocating types, with centrifugal variants being more prevalent for high-flow applications. Leading manufacturers design them to comply with international standards like API 685 for sealless pumps, ensuring reliability in critical operations.
Structure and Working Principle
A cryogenic pump typically consists of a motor, impeller, cryogenic shaft seals, and a double-walled casing filled with insulation material. The motor drives the impeller, which creates centrifugal force to move the fluid while maintaining a vacuum-sealed environment to reduce heat ingress. The working principle relies on maintaining fluid integrity at sub-zero temperatures. Before startup, the pump undergoes pre-cooling to avoid thermal shock. Advanced models feature gas purge systems to prevent icing and use magnetic couplings or canned motor designs to eliminate leakage points.
Key Features
Thermal efficiency is paramount; these pumps use multilayer insulation (MLI) or vacuum jacketing to limit boil-off gas formation. Materials like austenitic stainless steel retain ductility at cryogenic temperatures, while PTFE or graphite seals ensure longevity. Other features include low NPSH (Net Positive Suction Head) requirements to handle volatile fluids and vibration-dampening mounts for stability. Some models integrate IoT-enabled sensors for real-time monitoring of temperature, pressure, and flow rates, enhancing predictive maintenance.
Application Areas
Primary applications include LNG liquefaction plants, where pumps transfer liquefied natural gas between storage tanks and carriers. In the medical sector, they distribute liquid oxygen for hospital pipelines. Industrial gas producers use them for argon and nitrogen handling. They are also critical in space propulsion systems for rocket fuel circulation. Petrochemical refineries deploy these pumps for ethylene and propylene processing, where temperatures can plummet below -100°C.
Maintenance and Precautions
Routine maintenance involves checking seal integrity, insulation performance, and bearing lubrication. Always follow the manufacturer’s cooldown procedure (typically using nitrogen gas) to avoid thermal stress cracks. Never operate the pump without proper fluid priming, as dry running can damage seals. Inspect relief valves regularly to prevent overpressure scenarios. For long-term storage, purge residual fluids and maintain a nitrogen blanket to inhibit moisture ingress.
B2B Procurement Guide
When sourcing cryogenic pumps, specify flow rate (e.g., 10–500 m³/h), head pressure, and fluid compatibility. Verify certifications like ASME B73.3 or PED 2014/68/EU. Opt for suppliers with field service support for installation and troubleshooting. Consider total cost of ownership: energy-efficient designs (e.g., IE3 motors) reduce operational expenses. For reference, a mid-range 100 m³/h LNG pump costs approximately $20,000–$30,000. Request material test reports (MTRs) for critical components to ensure quality.
Related Manufacturers
- 主营：多级离心泵、立式多级泵、离心泵密封环、自来水管道泵、恒压变频增压泵、变频给水装置
- 主营：管道泵、离心泵、增压泵、排污泵、潜水泵、潜污泵、多级泵、自吸泵、化工泵、控制柜系列、变频供水设备
- 主营：农田泵、深井泵、深水泵、增压泵、轴流泵、加压泵、排污泵、潜水泵、管道泵、稳压泵、消防泵、双吸泵、多级泵、潜水电泵、消火栓泵、深井水泵、深井管泵、消防水泵、应急水泵、污水提升泵、农用抽水泵、地下取水泵、双吸离心泵、切割污水泵、异步电动机
- 主营：花边梁、卷扬机、反光吊带、离心泵、隧道施工、左开道岔、轨道接头、双钩链条、吊车垫木、支架液压枪、喇叭包胶辊、矿用自救器、弹簧扳道器、轨道防腐枕木、单体支柱柱帽、自救一体装置、单体支柱升柱器、液压支柱防倒带、紧急避险安全门、无压风门、托辊、防火栅栏两用门、避难硐室门
- 主营：自吸泵、高温泵、铸铁泵、热水泵、隔膜泵、化工泵、提升泵、加压泵、静音泵、潜水泵、管道泵、电机泵、循环泵、离心泵、立式泵、给水泵、多级泵、排污泵、空调泵、锅炉泵、热油泵、不锈钢多级泵、高温热、恒压供水、无负压变频供水
- 主营：中央空调、机电工程、冷却塔、水泵、水系统管道工程、工业冷却水系统
- 主营：管道泵、离心泵、潜水泵、排污泵、消防泵、清水泵、自吸泵、化工泵、多级泵、无负压变频供水设备、消防成套设备、控制柜系列
- 主营：管道离心泵
- 主营：磁力泵、磁力离心泵、化工磁力泵、化工泵、离心泵、化工离心泵、液下泵、化工液下泵、管道泵、管道离心泵、化工管道泵
- 主营：无负压供水设备、消防成套设备、消防控制柜、管道泵、离心泵、潜水泵、排污泵、消防泵、清水泵、自吸泵、化工泵、多级泵、液下泵、污水泵、潜水排污泵、潜水污水泵、液下排污泵、液下污水泵、搅匀型潜水排污泵、管道污水泵、立式离心泵、变频供水设备、变频控制柜
- 主营：增压泵、多级泵、排污泵、循环泵、多级离心泵、潜水泵防腐、永磁节能变频泵、废水排污离心泵、工业水循环泵
- 主营：增压泵、循环泵、螺杆泵、气动隔膜泵、不锈钢多级泵、不锈钢磁力泵、立式多级泵、管道泵、立式离心泵、卧式离心泵、不锈钢化工泵、衬氟泵、磁力泵、自吸泵、排污泵、屏蔽泵、水环真空泵、塑料泵、变频泵、防爆泵
- 主营：真空阀门、真空挡板阀、真空充气阀、立式单级离心水泵、潜水排污泵、上海连成泵、上海东方泵、凯泉离心泵、喷淋泵、消防泵、管道泵、东方污水泵、立式消防喷淋水泵、多级离心泵、锅炉给水泵、双吸中开离心泵、化工离心泵、连成管道离心泵、多级离心增压泵、立式多级离心泵、双吸泵、增压泵、防爆排污泵、真空蝶阀
- 主营：隔膜泵、气动隔膜泵、电动隔膜泵、粉体隔膜泵、卫生级隔膜泵、手动隔膜泵、真空泵、旋片式真空泵、水环式真空泵、计量泵、隔膜计量泵、柱塞式计量泵、加药计量泵、气液混合泵、电动抽液泵、电动油桶泵、电动抽油泵、旋涡泵、磁力泵、不锈钢磁力泵、衬氟磁力泵、螺杆泵、污泥螺杆泵、离心泵、多级离心泵
- 主营：气动隔膜泵、电动隔膜泵、卫生级隔膜泵、粉体气动隔膜泵、电动油桶泵、气液混合泵、水环式真空泵、施片式真空泵、不锈钢漩涡泵、手动隔膜泵、无密封自控自吸泵、自吸排污泵、污水泵、潜水排污泵、单螺杆泵、隔膜计量泵、柱塞式计量泵、液压隔膜计量泵、不锈钢磁力泵、管道离心泵、立式多级泵