Industrial gases such as oxygen, nitrogen, argon and hydrogen are being produced in gaseous form or as cryogenic liquids. For storage or back-up cryogenic liquid tanks are used.
Example: Back-up systems
Main Components:
- Tank liquid storage
- Pump raises liquid pressure
- Vaporiser liquid vaporised to ambient temperature
Cryogenic Storage Tanks Design
Flat Bottom Tanks
- atmospheric storage, held a few millibar above atmospheric pressure
- large quantities single product
- inner vessel stainless steel, outer vessel carbon steel
- site built tank
- emergency flap valves main in/outlets
- insulation: perlite interspace with nitrogen purge
Cryogenic Vacuum Standard Tanks
VIT (Vacuum Isolated Tank)
- Vacuum Insulated Tank- typically for pressures up to 5 bar (g)
- storage of liquid to be delivered to pump or tanker
VIE (Vacuum Isolated Evaporator)
- typically for pressures up to 35 bar (g)
- designed to operate with a vapouriser to supply gas to customer
- suitable for supply of large quantities of product for a short time
- inner vessel stainless steel, outer vessel carbon steel
- insulation: vacuum interspace, perlite filled
- vessels often supplied with instrumentation eg level indication, pressure protection
