Vacuum Jacketed Pipe (VJP)

Midwest Cryogenics provides stainless steel super-insulated Vacuum Jacketed Piping (VJP) systems used for the transfer of liquid nitrogen, oxygen, argon, carbon dioxide, and helium. Each VJP system is custom designed to meet the requirements of the application, while keeping the system economics within budget.

We also provide accessories (including valves, bayonet connections, cryovents, and flexible pipe).

Vacuum Jacketed (Insulated) Pipe

About our VJP and Services

Midwest Cryogenics uses stainless steel pipe in the manufacturing of its Vacuum Jacketed Pipe. VJP contains an inner line for the transfer of cryogenic liquids with an outer vacuum jacket. The vacuum annular space consists of a multi-layered insulation with an extremely low vacuum level of 9 microns or less.

VJP is fifty times more effective than conventional foam-insulated copper in preventing heat leak to the inner line, and VJP is extremely long lasting. Midwest Cryogenics builds the VJP to ASME B31.3 Code for Process Piping.

We prefer the use of inner line expansion joints. With the use of stainless steel inner expansion joints, the pipe supports for our VJP need not compensate for the thermal expansion of the inner line (3.86 in/100 ft for LN₂).

For lengths of jacketed pipe over forty feet in length, it is necessary to divide the pipe into individual spool sections. We offer two options: either a bayonet joint, or a field joint coupling.

Above: A custom VJP manifold