Cryogenic Pressure Build-Up (PBU) Vaporizer Calculator
Size pressure build-up coil capacity (Nm³/h), heat transfer duty (kW), and ambient air finned tube surface area to maintain cryogenic vessel operating pressure.
Withdrawal & Pressurization Requirements
Vaporizer & Coil Sizing
Recommended Tools & Equipment
Tested hardware and components for high reliability
Frequently Asked Questions
How does a cryogenic pressure build-up circuit work?
When liquid is withdrawn, tank head pressure drops. A pressure-building regulator senses this and opens, gravity-feeding dense liquid from the tank bottom through an external ambient finned vaporizer coil. The resulting warm gas returns to the tank vapor space to restore head pressure.
Why is heavy frost formation on PBU coils expected?
Cryogenic fluids boil at -160°C to -196°C. Moist ambient air freezes instantly on contact with the aluminum fins. Sizing models derate overall heat transfer coefficients by 40%–50% to account for this insulating frost layer.
What is the function of the economizer regulator?
If natural boil-off builds excessive tank pressure during idle periods, the economizer regulator prioritizes supplying customer demand from the head vapor space first, reducing tank pressure before drawing bottom liquid.