Overview
The large capacity Dewar flask is a critical tool for industries and research facilities requiring stable storage of cryogenic liquids. Named after its inventor, James Dewar, this double-walled vessel utilizes vacuum insulation to minimize heat transfer, enabling long-term preservation of substances at temperatures as low as -196°C. Modern variants often feature stainless steel construction for enhanced durability and safety. Common sizes range from 10 to 500 liters, catering to diverse needs from laboratory-scale use to bulk industrial applications. Advanced models include pressure relief mechanisms and ergonomic handles for safer handling. Their reliability makes them indispensable in sectors like healthcare (for IVF and specimen preservation), energy (LNG transport), and metallurgy.
Structure and Working Principle
A Dewar flask consists of an inner chamber (typically aluminum or glass) surrounded by an outer shell, with a high-vacuum space in between to eliminate conductive and convective heat transfer. The inner surfaces are often coated with reflective materials to reduce radiative heat ingress. Polyurethane foam may supplement insulation in larger units. The vacuum seal is the flask’s most critical component; any compromise can drastically reduce performance. Pressure relief valves prevent dangerous buildup from evaporating gases, while sturdy bases and handles ensure stability during transport. Larger units may include wheels or trolley systems for easier mobility.
Key Features
Superior thermal insulation is the hallmark of a high-quality Dewar flask, with evaporation rates as low as 0.5% per day for liquid nitrogen. Stainless steel construction resists corrosion and physical damage, while FDA-compliant materials ensure safety for medical use. Additional features may include level gauges, tamper-proof lids, and customizable ports for dispensing liquids. Industrial-grade flasks often comply with ISO 9001 or DOT/UN transportation standards. Some models integrate telemetry for remote monitoring of fill levels and temperature, enhancing operational efficiency.
Application Areas
In laboratories, Dewar flasks preserve biological samples, superconductors, and reagents. The healthcare sector relies on them for cryopreservation in fertility clinics and organ transplantation. Industrial applications include cooling superconducting magnets, food freezing, and aerospace component testing. Energy companies use large-capacity flasks to store and transport liquefied natural gas (LNG) and hydrogen. Their role in semiconductor manufacturing—where ultra-pure gases are essential—is equally vital. Agriculture and veterinary medicine also employ these containers for animal breeding programs and vaccine storage.
Maintenance and Precautions
Regular inspections are crucial to maintain vacuum integrity. Check for dents, frost accumulation, or hissing sounds, which may indicate leaks. Clean the exterior with mild detergents; avoid abrasive tools that could damage the surface. Always store flasks upright in well-ventilated areas to prevent pressure buildup. Use protective gloves and face shields when handling cryogenic liquids. For long-term storage, ensure the flask is vented to avoid excessive pressure from gradual evaporation. Follow manufacturer guidelines for requalification intervals, especially for units used in regulated industries.
B2B Procurement Guide
When sourcing large capacity Dewar flasks, prioritize suppliers with certifications like ISO or CE marks. Request test reports for insulation performance (e.g., evaporation rate under standardized conditions). Assess after-sales support, including repair services for vacuum systems. Consider total cost of ownership: a slightly pricier flask with lower evaporation rates may offer better ROI. For specialized needs (e.g., LNG transport), verify compliance with industry-specific regulations. Bulk buyers should negotiate warranties and explore modular designs for easier integration with existing infrastructure.
Related Manufacturers
- 主营：CNG减压撬、BOG回收机、工业减压装置、储藏液态气体杜瓦瓶、氧氩氮气化器、液氮泵撬设备租赁、LNG气化站、低温储罐、集中供气、空温式气化器、气化调压撬、气化撬设备、燃气调压箱、低温储存瓶、压缩机、减压撬设备、气化调压一体撬、lng汽化撬、汽化撬、气化撬、气化调压设备、液化天然气、氧气气化器、液化天然气储罐、工业气体蒸发器、工业用气化器
- 主营：漏水检测仪、气体测漏仪、气体检测仪、进口杜瓦瓶、粉尘检测仪、粉尘开关、环境粉尘仪、微波水分仪、在线水分仪、重锤料位计、水质检测仪、土壤检测仪、电波流速仪、便携测深仪、土壤比色卡、植物比色卡、树木生长锥、VOC气体检测仪、红外热像仪、地下管线仪、示踪气体检漏仪、双模两用测漏仪、混凝土含水率测试仪、渗漏巡检仪、水分仪、燃气检测仪
- 主营：压缩空气检测仪、气体检测仪、气体检测管、进口杜瓦瓶、液氮罐、离心机、维修检测标定校准、PH计、德尔格压缩空气质量检测仪、华瑞voc气体就检测仪、BW气体检测仪、上泰PH计、维萨拉露点仪
- 主营：杜瓦瓶、运输车
- 主营：液氮储罐、液态氧气罐、二氧化碳罐、杜瓦瓶、液体氧气储罐、液氩储罐、二氧化碳气瓶、液化天然气储罐、低温绝热气瓶、低温贮罐、液体液氧储罐、液氮液体储罐、液氧液体储罐、氧气罐、低温储罐、液氮罐、5立方液氧储罐、液态二氧化碳储存罐、低温气体储罐、快易冷低温储罐、杜瓦罐、氩气储罐
- 主营：减压撬、减压柜、低温储罐、工业气体杜瓦瓶、低温储气罐、低温卧式储罐、低温常压储罐、燃气调压箱、空温式气化器、集中供气、CNG减压撬、烘炉供气设备租赁、液氮泵撬设备租赁、CNG减压设备、燃气CNG减压撬、CNG工业减压箱、天然气减压计量撬、储罐、工业减压箱、调压箱、CNG调压箱、减压撬加气站、落地式计量撬
- 主营：储罐、管道安装、减压阀、杜瓦瓶、钢瓶、气化器、鱼车瓶
- 主营：各种蓄能器及配件、囊氏蓄能器、活塞式蓄能器、杜瓦瓶、隔膜式蓄能器、皮囊、氧气瓶氮气瓶二氧化碳、各种工业钢瓶、集装格 杜瓦罐
- 主营：泡沫箱、保温箱、食用干冰、液氮杜瓦瓶、工业气体容器、低温液体储罐、液氮罐、干冰、氮气瓶
- 主营：光谱仪、合金分析仪、手持光谱仪、杜瓦瓶、拉力试验机、超声波探伤、扫描电镜
- 主营：检测器、光谱仪、前处理、杜瓦瓶、分析仪、质谱仪、离子泵、旋片泵、真空泵、离子色谱、检测系统、生物液相、蒸发光散、液质联用仪、万能试验机、涡轮分子泵、示差折光检、气质联用仪、自动进样器、射线检测仪、单晶衍射仪、气相色谱仪、液相色谱系统、二维液相色谱、辐射监测系统、色谱纯化系统
- 主营：液相色谱仪、直读光谱、合金分析仪、杜瓦瓶、分光光度计、三坐标测量机
- 主营：检测器、测量仪、分析仪、杜瓦瓶、轨道阱、复合泵、光谱仪、真空泵、溶出度仪、纳喷技术、液相色谱、电泳系统、扫描电镜、蒸发光散、二极管阵、液质联用仪、毛细管电泳、分析型液相、气质联用仪、涡轮分子泵、污染检测仪、电子显微镜、分析型纯化、射线检测仪、氨基酸分析、红外碳硫仪
- 主营：检测器、旋片泵、分析仪、高容量柱温、衍射仪、质谱仪、离子泵、光谱仪、真空泵、能谱仪、溶出度仪、在线采样、自动制备、液相色谱、液质联用仪、倒置显微镜、剂量测量仪、二维液相色、自动进样器、射线检测仪、液质联用系统、气质联用系统、热释光读出器、线性离子阱质谱、自动化电泳系统
- 主营：lng储罐、槽罐车、储存罐、杜瓦瓶、运输车、卸车臂、气化器、液氧罐、加液车、配料罐、杜瓦罐、冷却机、稀配罐、反应釜、车载瓶、烘干机、cng储罐、汽化器、cng长管车、储罐回收、低温储罐、630减速机、lng气化站、运输罐车、二手钢瓶、二手储罐