Air Separation Plant Cases & Solutions


In large Industrial Parks, Iron and Steel Plants, Oil and Coal Chemical Plants and other places, it is necessary to set up Air Separation Plants to provide them with liquid oxygen (LO2), liquid nitrogen (LN2), liquid argon (LAr) or liquid helium (LHe) in production.

VI Piping System has been widely used in Air Separation Plants. Compared with conventional piping insulation, the heat leakage value of VI Pipe is 0.05~0.035 times of conventional piping insulation.

HL Cryogenic Equipment has nearly 30 years of experience in Air Separation Plant projects. HL's Vacuum Insulated Pipe (VIP) is established to ASME B31.3 Pressure Piping code as a standard. Engineering experience and quality control ability to ensure the efficiency and cost-effectiveness of the customer's plant.

Related Products


  • Saudi Basic Industries Corporation (SABIC)
  • Air Liquide
  • Linde
  • Messer
  • Air Products & Chemicals
  • BOC
  • Sinopec
  • China National Petroleum Corporation (CNPC)


HL Cryogenic Equipment provides customers with the Vacuum Insulated Piping System to meet the requirements and conditions of large plants:

1.Quality Management System: ASME B31.3 Pressure Piping Code.

2.Long Transferring Distance: High requirement of vacuum insulated capacity to minimize gasification loss.

3.Long conveying distance: it is necessary to consider the contraction and expansion of the inner pipe and the outer pipe in cryogenic liquid and under the sun. The maximum working temperature can be designed at -270℃~90℃, usually -196℃~60℃.

4.Large Flow: The largest inner pipe of VIP can be designed and manufactured the diameter of DN500 (20").

5.Uninterrupted Working Day & Night: It has high requirements on the anti-fatigue of the Vacuum Insulated Piping System. HL has improved the design standards of flexible pressure elements, such as the design pressure of VIP is 1.6MPa (16bar), the design pressure of compensator is at least 4.0MPa (40bar), and for the compensator to increase the design of strong structure.

6.Connection with the Pump System: The highest design pressure is 6.4Mpa (64bar), and it needs a compensator with reasonable structure and strong capacity to bear high pressure.

7.Various Connection Types: Vacuum Bayonet Connection, Vacuum Socket Flange Connection and Welded Connection can be selected. For safety reasons, the Vacuum Bayonet Connection and the Vacuum Socket Flange Connection is not recommended to be used in the pipeline with large diameter and high pressure.

8.The Vacuum Insulated Valve (VIV) Series Available: Including Vacuum Insulated (Pneumatic) Shut-off Valve, Vacuum Insulated Check Valve, Vacuum Insulated Regulating Valve etc. Various types of VIV can be modular combined to control the VIP as required.

9.The Special Vacuum Connector for Cold Box & Storage Tank Available.