Vacuum Jacketed Pipe (VIP) Heat Leak Calculator

Calculate heat ingress per linear meter (W/m), radiation heat transfer, spacer conduction, and cryogen evaporation rate in vacuum jacketed piping.

Pipe Geometry & Annulus

Inner Process Pipe NPS / OD (mm): e.g., 1" NPS (33.4 mm OD)

Outer Vacuum Jacket OD (mm): e.g., 2.5" / 3" outer jacket

Pipe Run Total Length (m):

MLI Wrap Layers (Mylar/Dacron):

Thermal Performance & Heat Leak

Heat Ingress per Meter (W/m):

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Total Line Heat Ingress (Watts):

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LN₂ Boil-Off in Line (L/h):

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Apparent Thermal Conductivity k_eff:

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Frequently Asked Questions

How does VIP compare to conventional polyurethane foam insulation?

Vacuum Jacketed Pipe (VIP) has a thermal conductivity ~ 50 times lower than conventional polyurethane or aerogel foam (0.0005 W/m·K vs 0.025 W/m·K), virtually eliminating external pipe icing.

What maintains vacuum integrity inside sealed VIP spools over decades?

Sealed VIP incorporates chemical getters (barium, titanium, or zirconium alloys) inside the vacuum space that continuously adsorb outgassed hydrogen, CO, and water vapor at room temperature.

What is a thermal bridge spacer?

Support spacers center the cold inner pipe inside the outer jacket. Fabricated from low-conductivity composite materials (G-10 fiberglass or polyimide), they minimize direct solid conduction.