Vacuum insulated pipes (VIPs), also known as vacuum jacketed pipes, are specially designed piping systems used for the safe and efficient transportation of cryogenic liquids. They are widely applied in industries requiring extremely low-temperature fluid handling, including air separation, healthcare, aerospace, semiconductor manufacturing, and energy.
Cryogenic fluids such as liquid nitrogen (LN₂), liquid oxygen (LOX), liquid hydrogen (LH₂), and liquefied natural gas (LNG) must be maintained at very low temperatures during transfer. Without effective insulation, heat leakage from the external environment can cause excessive evaporation, product loss, and reduced system efficiency.
Vacuum insulated pipes minimize these challenges by providing superior thermal insulation and ensuring reliable cryogenic fluid delivery.
Table of Contents
1. Structure and Working Principle of Vacuum Insulated Pipes
2. Applications of Vacuum Insulated Pipes
3. Advantages of Vacuum Insulated Pipe Systems
4. Challenges and Development Trends of Vacuum Insulated Pipe Technology
● Structure and Working Principle of Vacuum Insulated Pipes
A vacuum insulated pipe consists of a double-wall pipe structure, including an inner pipe and an outer jacket pipe.
The inner pipe is responsible for transporting the cryogenic medium, while the outer pipe provides mechanical protection and forms a sealed vacuum chamber around the inner pipe.
The annular space between the two pipes is evacuated to create a high vacuum environment. This vacuum layer significantly reduces heat transfer through conduction and convection, minimizing thermal losses during operation.
In many advanced VIP systems, additional insulation materials such as multilayer insulation (MLI) are installed inside the vacuum space to further improve insulation performance.
Key components typically include:
- Inner stainless steel process pipe
- Outer stainless steel vacuum jacket
- Vacuum insulation layer
- Multilayer insulation (MLI)
- Expansion joints or flexible sections
- Specialized cryogenic connections
This structure allows vacuum insulated pipes to maintain stable cryogenic temperatures over long-distance transportation systems.
● Applications of Vacuum Insulated Pipes
Vacuum insulated piping systems are widely used in industries where cryogenic fluid transportation requires high efficiency and reliability.
Air Separation Industry
In air separation plants, VIP systems are commonly used for transporting liquid nitrogen, liquid oxygen, and liquid argon between storage tanks, pumps, and process equipment.
Low heat leakage is essential to reduce product evaporation and improve overall plant efficiency.
Medical and Healthcare Applications
Liquid oxygen is widely used in hospitals and medical facilities. Vacuum insulated pipes ensure reliable oxygen delivery while minimizing losses caused by evaporation.
Aerospace Industry
Rocket propulsion systems rely on cryogenic fuels such as liquid oxygen and liquid hydrogen. VIP technology helps maintain fuel quality and temperature stability during storage and transfer.
LNG and Energy Sector
Liquefied natural gas requires extremely low temperatures during transportation and storage. Vacuum insulated piping systems provide an efficient solution for LNG terminals, fueling stations, and industrial gas applications.
Semiconductor and High-Tech Manufacturing
Advanced manufacturing processes often require high-purity cryogenic gases. VIP systems help maintain product purity and stable supply conditions.
● Advantages of Vacuum Insulated Pipe Systems
1. Excellent Thermal Insulation Performance
The vacuum insulation layer greatly reduces heat transfer, resulting in lower evaporation rates and improved cryogenic fluid retention.
2. Reduced Product Loss
By minimizing heat ingress, VIP systems reduce boil-off losses, helping companies improve operational efficiency and reduce material waste.
3. Improved Safety and Reliability
Stable cryogenic temperatures reduce pressure fluctuations caused by vaporization, improving system safety.
4. Lower Maintenance Requirements
Compared with conventional insulation methods, vacuum insulated pipes provide long-term insulation performance with reduced maintenance requirements.
5. Compact and Space-Efficient Design
VIP systems provide superior insulation performance without requiring thick external insulation layers, making them suitable for complex industrial layouts.
● Challenges and Development Trends of Vacuum Insulated Pipe Technology
Although vacuum insulated pipes offer significant advantages, several technical challenges remain.
Initial Investment Cost
VIP systems require advanced manufacturing processes, vacuum technology, and high-quality materials, resulting in higher initial installation costs compared with conventional insulated piping.
Manufacturing and Installation Requirements
The design, fabrication, and installation of VIP systems require specialized engineering knowledge to ensure vacuum integrity and long-term performance.
Future Innovations
Continuous improvements in materials and manufacturing technologies are driving the development of more efficient VIP solutions.
Current trends include:
- Flexible vacuum insulated pipes for complex layouts
- Improved vacuum retention technologies
- Lightweight jacket materials
- Higher-performance multilayer insulation systems
- Modular VIP solutions for faster installation
These innovations are helping expand the application range of cryogenic piping systems.
● FAQS
Since 1992, HL Cryogenics has specialized in the design and manufacturing of high-vacuum insulated cryogenic piping systems and related support equipment, tailored to meet diverse customer needs. We hold ASME, CE, and ISO 9001 certifications, and have provided products and services to many well-known international enterprises. Our team is sincere, responsible, and committed to excellence in every project we undertake.
Vacuum Insulated/Jacketed Pipe
Vacuum Insulated/Jacketed Flexible Hose
Phase Separator / Vapor Vent
Vacuum Insulated (Pneumatic) Shut-off Valve
Vacuum Insulated Check Valve
Vacuum Insulated Regulating Valve
Vacuum Insulated Connectors for Cold Boxes & Containers
MBE Liquid Nitrogen Cooling Systems
Other cryogenic support equipment related to VI piping — including but not limited to safety relief valve groups, liquid level gauges, thermometers, pressure gauges, vacuum gauges, and electric control boxes.
We are happy to accommodate orders of any size — from single units to large-scale projects.
HL Cryogenics' Vacuum Insulated Pipe (VIP) is manufactured in accordance with the ASME B31.3 Pressure Piping Code as our standard.
HL Cryogenics is a specialized vacuum equipment manufacturer, sourcing all raw materials exclusively from qualified suppliers. We can procure materials that meet specific standards and requirements as requested by customers. Our typical material selection includes ASTM/ASME 300 Stainless Steel with surface treatments such as acid pickling, mechanical polishing, bright annealing, and electro polishing.
The size and design pressure of the inner pipe are determined according to the customer's requirements. The size of the outer pipe follows HL Cryogenics' standard specifications, unless otherwise specified by the customer.
Compared with conventional piping insulation, the static vacuum system provides superior thermal insulation, reducing gasification losses for customers. It is also more cost-effective than a dynamic VI system, lowering the initial investment required for projects.
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Post time: Jul-22-2026
